Panasonic Kx Tc1488lbb

© 2003 Panasonic Communications Co., Ltd. Allrights reserved. Unauthorized copying anddistribution is a violation of law.

KX-TC1488LBB900MHz Cordless PhoneBlack Version

(for Brazil)

Telephone Equipment

ORDER NO. KM40307154C3

1 ABOUT LEAD FREE SOLDER (PbF: Pb free) 4

1.1. Suggested PbF Solder 4

1.2. Base Unit 5

1.3. Handset 9

2 FOR SERVICE TECHNICIANS 12

3 CAUTION 12

4 BATTERY 13

4.1. Installing the Battery in the Handset 13

4.2. Battery charge 13

4.3. Battery Recharge 13

4.4. Battery Information 13

4.5. Battery Replacement 14

5 LOCATION OF CONTROLS 15

5.1. Base unit 15

5.2. Handset 16

6 SETTINGS 17

6.1. Connections 17

6.2. Adding Another Phone 17

6.3. Display Language 18

6.4. Dialling Mode 18

6.5. Standby Mode (While the handset is off the base unit) 18

6.6. Ringer Volume 18

7 OPERATIONS 19

7.1. Making Calls 19

7.2. Answering Calls 20

7.3. Phone Book 21

8 DISASSEMBLY INSTRUCUTIONS 26

9 HOW TO REMOVE TEL JACK 28

10 TROUBLESHOOTING GUIDE 29

10.1. Check Power 30

10.2. Bell Reception 31

10.3. Check Battery Charge 32

10.4. Check Link 33

10.5. Check Handset Transmission 35

10.6. Check Handset Reception 35

11 ADJUSTMENTS (BASE UNIT) 36

11.1. Test Mode Flow Chart (Base Unit) 36

11.2. Adjustment 37

11.3. Adjustment Standard (Base Unit) 38

12 ADJUSTMENTS (HANDSET) 40

12.1. Test Mode Flow Chart (Handset) 40

12.2. Adjustment 41

12.3. Adjustment Standard (Handset) 42

13 FREQUENCY TABLE (MHz) 44

14 BLOCK DIAGRAM (BASE UNIT) 45

15 CIRCUIT OPERATION 46

15.1. Outline 46

15.2. Power Supply Circuit 46

15.3. Reset Circuit 47

15.4. Charge Circuit 48

15.5. Telephone Line Interface 49

15.6. Transmitter/Receiver 49

15.7. Calling Line ldentification Circuit (Caller ID) 50

15.8. Caller ID Detection 50

16 BLOCK DIAGRAM (HANDSET) 51

17 CIRCUIT OPERATION (HANDSET) 52

17.1. Outline 52

17.2. Reset Circuit/Charge Circuit 52

17.3. Battery Low / Power Down Detector 53

18 SIGNAL ROUTE 54

19 CPU DATA (BASE UNIT) 55

19.1. U1 55

19.2. U4 (DTMF CID IC) 56

19.3. Digital Security Coding System 56

20 CPU DATA (HANDSET) 57

20.1. U1 57

21 EXPLANATION OF IC TERMINALS (RF UNIT) 59

21.1. U1 59

22 HOW TO REPLACE A FLAT PACKAGE IC 60

22.1. Preparation 60

22.2. Procedure 60

22.3. Removing Solder from Between Pins 60

23 CABINET AND ELECTRICAL PARTS LOCATION (BASE UNIT)

61

24 CABINET AND ELECTRICAL PARTS LOCATION (HANDSET) 62

25 ACCESSORIES AND PACKING MATERIALS 63

26 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES

64

26.1. Base Unit 64

26.2. Handset 64

27 REPLACEMENT PARTS LIST 65

27.1. Base Unit 65

27.2. Handset 68

27.3. Accessories and Packing Materials 71

CONTENTS Page Page

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28 FOR SCHEMATIC DIAGRAM 72

28.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT)) 72

28.2. Handset (SCHEMATIC DIAGRAM (HANDSET)) 72

28.3. Memo 73

29 SCHEMATIC DIAGRAM (BASE UNIT) 74

29.1. Main 74

29.2. RF Module 75

30 SCHEMATIC DIAGRAM (HANDSET) 76

30.1. Main 76

30.2. RF Module 77

30.3. Memo 78

31 CIRCUIT BOARD (BASE UNIT) 79

31.1. Main (Component View) 79

31.2. Main (Flow Solder Side View) 80

31.3. Locator (Component View) 81

31.4. Locator (Flow Solder Side View) 81

31.5. Memo 82

31.6. RF Module (Component View) 83

31.7. RF Module (Flow Solder Side View) 84

32 CIRCUIT BOARD (HANDSET) 85

32.1. Main (Component View) 85

32.2. Main (Flow Solder Side View) 86

32.3. RF Module (Component View) 87

32.4. RF Module (Flow Solder Side View) 88

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KX-TC1488LBB

1 ABOUT LEAD FREE SOLDER (PbF: Pb free)Note:

In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder thatcontains lead.

We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn),Silver (Ag), and Copper (Cu).

This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repairwork we suggest using the same type of solder although, with some precautions, standard Pb solder can also be used.

Caution

· PbF solder has a melting point that is 50°F ~ 70°F (30°C ~ 40°C) higher than Pb solder. Please use a soldering iron withtemperature control and adjust it to 700°F ± 20°F (370°C ± 10°C). In case of using high temperature soldering iron, pleasebe careful not to heat too long.

· PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100°F, (600°C).

· If you must use Pb solder on a PCB manufactured using PbF solder, remove as much of the original PbF solder as possibleand be sure that any remaining is melted prior to applying the Pb solder.

· When applying PbF solder to double layered boards, please check the component side for excess which may flow onto theopposite side (See figure, below).

1.1. Suggested PbF SolderThere are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper,

(Sn+Ag+Cu), you can also use Tin and Copper, (Sn+Cu), or Tin, Zinc, and Bismuth, (Sn+Zn+Bi). Please check the manufac

turer’s specific instructions for the melting points of their products and any precautions for using their product with other

materials.

The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.

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KX-TC1488LBB

1.2. Base Unit

1.2.1. Main

X1

Marked

PbF

(Component View)

5

KX-TC1488LBB

1.2.2. Locator

Marked

PbF

(Component View)

Marked

PbF

(Flow Solder Side View)

U1

Marked

PbF


Note:

The location of the “PbF“ mark is subject to change without notice.

Note:


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KX-TC1488LBB

1.2.3. RF Module

U1

Marked

PbF

(Component View)

7

KX-TC1488LBB

PbFMarked


Note:


8

KX-TC1488LBB

1.3. Handset

1.3.1. Main

U1

Marked PbF

(Component View)

9

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LCD1

Marked PbF


Note:


10

KX-TC1488LBB

1.3.2. RF Module

U1

Marked PbF

(Component View)

11

KX-TC1488LBB

PbF

RA16A

Marked


Note:


2 FOR SERVICE TECHNICIANSICs and LSIs are vulnerable to static electricity.

When repairing, the following precautions will help prevent recurring malfunctions.

1. Cover the plastic parts boxes with aluminum foil.

2. Ground the soldering irons.

3. Use a conductive mat on the worktable.

4. Do not touch IC or LSI pins with bare fingers.

3 CAUTIONDanger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommendenced by themanufacturer.

Dispose of used batteries according to the manufacture’s Instructions.

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KX-TC1488LBB

4 BATTERY4.1. Installing the Battery in the Handset

4.2. Battery charge

4.3. Battery Recharge

4.4. Battery Information

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4.5. Battery Replacement

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5 LOCATION OF CONTROLS5.1. Base unit

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5.2. Handset

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6 SETTINGS6.1. Connections

· Use only with Panasonic AC Adaptor PQWATC1468LB.

· The AC adaptor must remain connected at all times. (It is normal for the adaptor to feel warm during use.)

· If your unit is connected to a PBX which does not support Caller ID services, you cannot access those services.

6.2. Adding Another PhoneThis unit will not function during a power failure. To connect a standard telephone on the same line, use a T-adaptor.

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KX-TC1488LBB

6.3. Display Language

6.4. Dialling Mode

6.5. Standby Mode (While the handset is off the base unit)

6.6. Ringer Volume

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7 OPERATIONS

7.1. Making Calls

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7.2. Answering Calls

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7.3.1. Storing Names and Numbers

7.3. Phone Book

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7.3.2. Entering Names and Symbols

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7.3.3. Finding Stored Items

7.3.4. Dialing

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7.3.5. Editing

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7.3.6. Erasing

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8 DISASSEMBLY INSTRUCUTIONS

Show in Fig. To remove. Remove.1 Lower Cabinet Screws (2.6 × 8)................. ...... (A) × 42 Locator P.C.Board Screws (2.3 × 6)................. ...... (B) × 4

Locator P.C.Board3 RF P.C.Board Screws (2 × 6)................. ...... (C) × 3

RF P.C.Board4 Main P.C.Board Screws (2.3 × 6)................. ...... (D) × 4

Main P.C.Board

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KX-TC1488LBB

Show in Fig. To remove. Remove.5

Rear CabinetBattery compartment cover.

6 Screws (2.6 × 8)................. .....(E) × 278 Antenna Screw (2.6 × 8)................. .....(F) × 1

RF P.C.Board Screws (2 × 6)................. .....(G) × 2RF P. C. Board.

9 Main P.C.Board Screws (2 × 6)................. .....(H) × 2Main P.C.Board

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KX-TC1488LBB

9 HOW TO REMOVE TEL JACK 1. Keep 2 hooks for TEL JACK fixing open in the direction of arrow 1, then pull the top of TEL JACK forward as shown arrow 2

until the hooks click. (Refer to Fig. 1 .)

2. Remove TEL JACK pulling just above in the direction of arrow 3. (Refer to Fig. 2 .)

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KX-TC1488LBB

10 TROUBLESHOOTING GUIDE

Cross Reference:

Check Power (P.30)

Check Battery Charge (P.32)

Check Link (P.33)

Check Handset Transmission (P.35)

Check Handset Reception (P.35)

Bell Reception (P.31)

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KX-TC1488LBB

Cross Reference:

Reset Circuit (P.47)

Power Supply Circuit (P.46)

** : Connections (P.17)

Cross Reference:

Charge Circuit (P.48)

Note:

CPU: U1

Note:

CPU: U1

10.1. Check Power

* : Each measurement points are shown in CIRCUIT BOARD (BASE UNIT) (P.79) or CIRCUIT BOARD (HANDSET) (P.85)

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KX-TC1488LBB

Cross Reference:

Telephone Line Interface (P.49)

Note:

CPU : U1

10.2. Bell Reception

* : Each measurement points are shown in CIRCUIT BOARD (BASE UNIT) (P.79) or CIRCUIT BOARD (HANDSET) (P.85)

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KX-TC1488LBB

Cross Reference:

Charge Circuit (P.48)

Power Supply Circuit (P.46)

** : Connections (P.17)

Cross Reference:

Reset Circuit/Charge Circuit (P.52)

Note:

CPU: U1

Note:

CPU: U1

10.3. Check Battery Charge

*: Each measurement points are shown in CIRCUIT BOARD (BASE UNIT) (P.79) or CIRCUIT BOARD (HANDSET) (P.85)

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KX-TC1488LBB

**: Refer to Adjustment (P.37) Note:

CPU: U1

RF IC: U1

10.4. Check Link

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**: Refer to Adjustment (P.41). Note:

CPU: U1

RF IC: U1

*: Each measurement points are shown in CIRCUIT BOARD (BASE UNIT) (P.79) or CIRCUIT BOARD (HANDSET) (P.85)

*: Each measurement points are shown in RF Module (Component View) (P.87)

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10.5. Check Handset Transmission

Cross Reference:

SIGNAL ROUTE (P.54)

10.6. Check Handset Reception

Cross Reference:

SIGNAL ROUTE (P.54)

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11 ADJUSTMENTS (BASE UNIT)If your unit have below symptoms, adjust or confirm each item using remedy column from the table.

Symptom Remedy*The base unit dose not respond to a call from handset. Make adjustments in item (A)The base unit dose not transmit or the transmit frequency is off. Make adjustments in item (B)The transmit frequency is off. Make confirmation in item (C)The transmit power output is low, and the operating distance between the base unit andthe handset is less than normal.

Make confirmation in item (D)

The reception sensitivity of base unit is low with noise. Make confirmation in item (E)The transmit level is high or low. Make confirmation in item (F)The reception level is high or low. Make adjustments in item (G)The unit does not link. Make confirmation in item (H), (I)

*: Refer to Adjustment (P.37).

11.1. Test Mode Flow Chart (Base Unit)The operation-flow of Test mode and main check items are shown below.

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KX-TC1488LBB

11.2. AdjustmentAdjustment Items Test Mode Adjustment

Point*Procedure Check or

ReplaceParts

(A) RX VCO CH1 Talk L502 · Adjust L502 so that the reading of the Digital Voltmeter is 1.75V ± 0.2V.(at TP808)

U1, L502,VD501

(B) TX VCO CH1 Talk L503 · Adjust L503 so that the reading of the Digital Voltmeter is 1.8V ± 0.15V.(at TP809)

U1,VD502,

L503(C) TX Frequency CH1 Talk VC1 · Adjustment VC1 so that the reading of the frequency counter is 1ch Freq.

(902.1MHz) ± 9KHz at the antenna.U1,

U2, X2(D) TX Power

ConfirmationCH1 Talk T5 · Confirm so that the reading of the RF VTVM is -7 ± 2dBm. (at TP510) U1, Q509,

Q510,FL501,L503

(E) RX SensitivityConfirmation

CH1 Talk - 1. Apply -107dBm output from S.S.G. (modulation frequency 1KHz, dev.0KHz).

2. Confirm that the distortion reading of Audio Analyzer is less than 25%.

FL501,CF501,

U1

(F) Line Output LevelConfirmation

CH1 Talk - 1. Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.25KHz).

2. Confirm that the reading of Audio Analyzer is -22 ± 1dBm (600Ω load).

U3,U1

(G) Line InputModulationConfirmation

CH1 Talk - 1. Input via loop simulator 1.0KHz, -16dBm (measured at T-R) signal.

2. Confirm so that the reading of FM Deviation Meter is 25KHz ± 1KHz.

U1, VD502

(H) RSSI Confirmation RSSI - Hold the “Locator” key for 5 seconds to enter to RSSI test. 1. Measure the SSG output level when the SIG_OUT changes from Low to

High.

2. Confirm that the SSG output level is -70+10/-15dBm.

U1, FL501

(I) DataModulationconfirmation

TX Data - · Confirm for 60 ± 15/-10KHz FM Deviation Meter reading U1*,VD502

The connection of adjustment equipment are as shown in Adjustment Standard (Base Unit) (P.38).

SSG Frequency: 925.9 MHz

U1: RF_IC

U1*: CPU

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11.3. Adjustment Standard (Base Unit)(Main, Flow Solder Side View)

U1

U3

PbF

AF OSC

LOOPSIMULATOR

Audio Analyzer

(E) (F)

Tip

RingD1Q3

C7C20

C63

R28

R59C16C34C99C65

R55

R7

JR4

R15JR5

JR12

R68R109

R111C52

CAS

ATE

CAS_ATT

EC3

R18

R11

C3

R11

4R12

R65

R66R67

R60TP4

TP1TP3

JR3R77

D4

R64

C46

C68D4

2322

11

C22

C8C6R27

Q5

R73

Q2

Q6

Q7

Q4

Q10

Q8

C2

R26

R108

R17D11

C42R76

C12

U2

R9

R30

+5V AC3C60

TP2

R107

R24

C14

C28R22

R41 R40

C35

C1

R43

AC4

AC2

R42 R8

C19

C74

C55

C64

C56

R51

R72

R48C67

C30

R95

C97

R96

JR11

R94

JR8

R2

R78

R92

C62C

54

R34R

21R

23

R46

R10

4 R10

3R

105

C49

C23

C24

C15

C25

C57

C4R63

R10

0

R98

41

R58

R61

R86

R57

R54 R

70

C66

C41

R85

R11

7R

110

R116

R12

5

R12

3R

52

R12

1JR

2

R12

4R

19

R13 D

3R

102

R71

R38

R10

1C

48C

40 R99

C51

C5

C43C

44C

50

R80

R37

R83

R93

R35

R36

R39

R4

R11

5

R69

R91

R53

R82R

6 AR

6

R3R

113

C73

C47

C27 C

13

C58

R87

C18

R81

R88

R14

7

R15

0 R12

0

R11

8

R11

2

R14

C59

R16

R20

C39

C33

C38

R75

D2

C29

D6

R5

AR

5R

106

C26

R32 R

31

R25

C31

R84

R29

R62

C61

D7 D8

D9

D10

C21C9

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(RF Module, Component View)

R517

R551R514

R511

R513

R536

C574 C575

C595

C555

R585

C583

C538

C57

0C

500

R51

0

R52

4R

522

R54

3R

518

R54

4R59

3

R50

9

R60

4

R4

R13

R10

R8 R61

1R

606

R512

R7

R609

R531

R504

R520

R534

R533

R537

R9

R610

R578

R62

1

R619

C530

C20

C593C592

C545

C598

C591

L503

L506C4

R571

C559

C556C560

C562

C586

C567

C557

C12C535

C533

C22C25 C605

CF501

C563

C23

U1

C502

C8

C31C37

C32R5R3

C39

T1

C28

P3

C38

C6R12

R11R18

R1

R21

C21C16

D1

R30R31 15 10 5 1

ESC8ESC7

R19

C7

C33R17

R20

C34C13

C3C35C36

R15

C30

C29 C24

C604

L504

R503 R6

R521

R562

R561

R577C568

Q555

Q556

Q506

Q512

R56

9

R50

1

C57

8

C54

6

C50

3C

582

FL5

01

C59

7

C54

2

C60

0

C56

5

C51

9

C56

4C

566

C60

2

Q50

9

L502

L505

VD

501

VD

502 C

590

C59

9

C54

9C

534

C57

3

C56

9

C52

6

C56

1

C50

4C

543

C54

1

C53

7

C55

4 C53

9C

536

C15

R622

R11

1

EC

2

D2

C14

C19

C11

C2

R16

EC

1

C17

C18

F1

C9 C10

C5

C40

C55

8

R2

C50

5

ES

C10

C41

C57

2C

527 Q510

C521

C571C1 R541

(H)

Oscillo scope

SIG_OUT

GND

TP809(TXVCO)

D.M.

(B) TP808 (RXVCO)

D.M.

(A)

FM Deviation Meter (G), (I)

Frequency Counter (C)SSG

925.9MHz

Spectrum Analyzer (D)

PbF

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12 ADJUSTMENTS (HANDSET)If your unit have below symptoms, adjust or confirm each item using remedy column from the table.

Symptom Remedy*The handset does not respond to a call from the base unit. Make adjustments in item (A)The handset does not transmit or the transmit frequency is off. Make adjustments in item (B)The transmit frequency is off. Make confirmation in item (C)The transmit power output is low, and the operating distance between the base unit andthe Handset is less than normal.

Make confirmation in item (D)

The reception sensitivity of handset is low with noise. Make confirmation item (E)Does not link between the base unit and the handset. Make confirmation in item (F)The reception level is high or low. Make confirmation item (G)The transmit level is high or low. Make adjustments in item (H)

*: Refer to Adjustment (P.41).

Unit condition:

1. Remove the antenna lead wire from P.C Board of the handset.

2. Power Supply: DC 3.9V (DC power supply)

3. Speaker Load: 150Ω

CH TX Frequency RX Frequency VolumeCH1 925.9MHz 902.1MHz 2

12.1. Test Mode Flow Chart (Handset)

Note:

Refet to CIRCUIT BOARD (HANDSET) (P.85)

SIGNAL ROUTE (P.54)

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12.2. AdjustmentAdjustment Items Test Mode Adjustment

PointProcedure Check or

ReplaceParts

(A) TX VCO Talk L503 1. Adjust L503 so that the reading of the Digital Voltmeter is 1.80V ± 0.15V.(at TP809)

U1, L503,VD502

(B) RX VCO Talk L502 1. Adjust L502 so that the reading of the Digital Voltmeter is 1.75V ± 0.2V.

(at TP808)

U1, L502,VD501

(C) TX FrequencyAdjustment

Talk VC1 · Adjust VC1 so that the reading of the frequency counter is 925.9MHz ±9KHz.

U1

(D) TX PowerConfirmation

Talk - · Output level should be over -4 ± 2dBm on RF VTVM (50Ω load). (atTP510)

U1, Q509,Q510,FL501,L503

(E) RX SensitivityConfirmation(SP out)

Talk - 1. Apply -107dBm output from S.S.G. (modulation frequency 1KHz, dev.25KHz).

2. Confirm that the distortion reading of Audio Analyzer is less than 25%.

FL501,CF501, U1

(F) RSSI Confirmation Talk - 1. Measure the SSG output level when the SIG_OUT changes from Low toHigh. (modulation frequency 1KHz, dev.25kHz)

2. Confirm that the SSG output level is -70 ± 15dBm.

U1, FL501

(G) SpeakerOutput Levelconfirmation

Talk - 1. Apply -47dBm output from S.S.G. (modulation frequency 1KHz, dev.25KHz).

2. Confirm that SP output level is 75 ± 10mVrms.

U1

(H) Mic ModulationFactor

Talk VR1 1. Apply a MIC signal (1KHz, 3.8mVrms).

2. Adjust so that the reading FM Deviation Meter is 25kHz ± 1KHz.

U1, VD502

(I) DataModulationConfirmation

Tx Data - · Confirm for 70kHz ± 10KHz FM Deviation Meter reading. U1, U1*

The connections of adjustment equipment are as shown in Adjustment Standard (Handset) (P.42).

SSG Frequency: 902.1 MHz

U1: RF_IC

U1*: CPU

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12.3. Adjustment Standard (Handset)(Main, component View)

DC Power Supply

PbF

C24

C2

L2

ZD2

R58

GND

MIC_I/P

BATT

C13

R55

L1

Q5

U3AAQ9

U2

U3

U3A

C17

C30VCC

R37

C34

C110

C1

D2

81 50

31

30

80

C4

WJ1

51

U1

1001

C9

R45R66

R38

R21

D4

C28

C27

Q10

R41R75

R30R60

R44R46R28

R62R51

R29R61

R40Q2

7 1

Q6Q1

SPK

R79D1

R19 R18

R78

R4

R49R26

C60

R42

R67

R54

R24

C15

R11R88

C14

Q3 R65

R7

X2

R2

Q7

ATE

Q8

Q4 SW1

R8R1

CON215

C31

BATT+

C10

2C

10 R5

R6

C7

C5

R92

C26

EC

3

EC

5E

C2

EC

5AE

C2A

EC

3A

C29

C3

C22

R25

C33

C18

C32

C36 C

35V

C1

C8

C38

C20

C23

C37

C21

R33 C

16

ZD

3

C64

D10

D8

D11

D9 D

3

C11

C10

3R

59

C25

R3

C12

C19

R57

R47

C39

Q12

OF

FO

N

BU

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(+

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D (

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R80

R81

R64

R14

R13

R91R

90

C6

D15

R35

R32

R48

R53

R31

R16

R12

R15

R52

R68

R89

R23

R20

R76

R9

C10

0

42

KX-TC1488LBB

(RF Module, Component View)

R517

R551R514

R511

R513

R536

C574 C575

C595

C555

R585

C583

C538

C57

0

C50

0

R51

0

R52

4R

522

R54

3

R51

8

R54

4

R59

3 R50

9

R60

4

R14

R4

R13

R10

R8

R61

1R

606

R512

R7

R609

R531

R504

R520

R534

R533

R537

R9

R610

R578

R621R5VR1

R31

R619

R30

C530

C20

C593C592

C545

C598

C591

L503

L506

C4

R571

C559

C556C560

C562

C586

C567

C557C12

EC1

C535

C533

C16

C22C25 C605

CF501

C563

C23

U1

C502

C8

C31

C37

C32R5A

R3

C39

T1

C28

P3

C38

C6R12

R11R18

R1

R21

C21

16 10 5 1

ESC8 ESC7

R19

C7

C33R17

C34

C13

C3

C35C36

R15

C30

C29C24

C604

L504

R503 R6

R521

R562

R561

R577C568

Q555

Q556

Q506

Q512

R56

9

R50

1

C57

8 FL5

01

C54

6

C50

3C

582

C59

7

C54

2

C60

0

C56

5

C51

9C

564

C56

6

C60

2

Q50

9

L502

L505

VD

501

VD

502

C59

0C

599

C54

9C

534

C57

3

C56

9

C52

6

C56

1

C50

4C

543

C54

1

C53

7

C55

4

C53

9

C53

6

C15

R62

2

R11

1

EC

2C

14

C19

C11

C2

R16

C17

C18

F1

C9 C10

C5

C40

C55

8

R2

C50

5

ES

C10

C41

C57

2C

527 Q

510

C521

C571C1 R541

TP809(TXVCO)

D.M.

(A)

Audio Analyzer Oscillo scope AF GeneratorGND

SIG_OUT

MIC_IN

(E) (G)

TP808 (RXVCO)

D.M.

(B)

TP510

FM Deviation Meter (H), (I)

Spectrum Analyzer (D)

Frequency Counter (C)

PbF

902.1MHz

SSG

43

KX-TC1488LBB

13 FREQUENCY TABLE (MHz)BASE UNIT HANDSET

Channel Transmit Frequency Receive Frequency Transmit Frequency Receive Frequency1 902.10 925.90 925.90 902.102 902.15 925.95 925.95 902.153 902.20 926.00 926.00 902.204 902.25 926.05 926.05 902.255 902.30 926.10 926.10 902.306 902.35 926.15 926.15 902.357 902.40 926.20 926.20 902.408 902.45 926.25 926.25 902.459 902.50 926.30 926.30 902.50

10 902.55 926.35 926.35 902.5511 902.60 926.40 926.40 902.6012 902.65 926.45 926.45 902.6513 902.70 926.50 926.50 902.7014 902.75 926.55 926.55 902.7515 902.80 926.60 926.60 902.8016 902.85 926.65 926.65 902.8517 902.90 926.70 926.70 902.9018 902.95 926.75 926.75 902.9519 903.00 926.80 926.80 903.0020 903.05 926.85 926.85 903.0521 903.10 926.90 926.90 903.1022 903.15 926.95 926.95 903.1523 903.20 927.00 927.00 903.2024 903.25 927.05 927.05 903.2525 903.30 927.10 927.10 903.3026 903.35 927.15 927.15 903.3527 903.40 927.20 927.20 903.4028 903.45 927.25 927.25 903.4529 903.50 927.30 927.30 903.5030 903.55 927.35 927.35 903.5531 903.60 927.40 927.40 903.6032 903.65 927.45 927.45 903.6533 903.70 927.50 927.50 903.7034 903.75 927.55 927.55 903.7535 903.80 927.60 927.60 903.8036 903.85 927.65 927.65 903.8537 903.90 927.70 927.70 903.9038 903.95 927.75 927.75 903.9539 904.00 927.80 927.80 904.0040 904.05 927.85 927.85 904.05

44

KX-TC1488LBB

14 B

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DC

CF

501

(RF

IC)

U1

(CP

U)

U1

U4

KX

-TC

1488

LBB

: BLO

CK

DIA

GR

AM

(B

AS

E U

NIT

)

KX-TC1488LBB

45

15 CIRCUIT OPERATION15.1. Outline

Base unit consists of the following ICs as shown in BLOCK DIAGRAM (BASE UNIT) (P.45).

· CPU: U1

− − − − Controlling the whole system

− − − − Forming/analyzing all data signals (ACK, CMD signal etc.)

− − − − All interfaces (ex: LED, KEY, Detector Circuit (Charge/ Power Down)

− − − − DTMF Generator

− − − − FSK Caller ID Receiver

· RF IC: U1

− − − − PLL Oscillator

− − − − Compress/ Expander

− − − − Amplifier for transmission and reception

· DTMF Caller ID Receiver: U4

− − − − Filter

− − − − DTMF tone detector and decoder

· Additionally

− − − − Power Supply Circuit

− − − − Reset Circuit

− − − − Charge Circuit

− − − − Telephone Line Interface Circuit

15.2. Power Supply CircuitThe power supply to the CPU (Digital, Analog) and RF IC from AC Adaptor (+9V) as shown in diagram in Reset Circuit (P.47).

46

KX-TC1488LBB

15.3. Reset CircuitAfter power supply from AC adaptor, the VDD (5.0V) is input to Q6, Q7 for making reset signal. Refer to the below waveform.

<Fig. 101>

<Fig. 102>

47

KX-TC1488LBB

15.4. Charge CircuitCircuit Operation:

When charging the handset on the base unit, the charge current is as follows;

DC+(9V) → L1 → CHG (Base) → [CHG1 (Handset) → D8 → BAT1....Battery....BAT2 (GND) → D3 → D9 → CHG2 (Handset)]

In this way, the CPU on both unit detects the fact that the battery is charged.

<Fig. 103>

Trickle charge mode: Q5 OFF

Normal charge mode: Q5 ON

48

KX-TC1488LBB

15.5. Telephone Line InterfaceFunction:

· Bell signal detection

· ON/OFF hook and pulse dial circuit

· Side tone circuit

Bell signal detection and OFF HOOK circuit:

In the idle mode, Q3 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T)

and Ring (R) leads (When the telephone rings), the AC ring voltage is transferred as follows:

T → L9 → C37 → R44 → U3-A, B → CPU (Ring DET). [BELL ]

When the CPU(IC3) detects a ring signal and press the TALK Key onto the handset. Q3 turns on, thus providing an off-hook

condition (active DC current flow through the circuit) and the following signal flow is for the loop current.

T → L9 → T4 → RLY1 → L10 → F1 → R [OFF HOOK]

ON HOOK Circuit:

Q3 is open, Q3 connected as to cut the DC loop current via RLY1 and to cut the voice signal. The unit is consequently in an

on-hook condition.

Pulse Dial Circuit:

CPU (LSEIZE) turns Q3 ON/OFF to make the pulse dialing via RLY1.

Side Tone Circuit:

Basically this circuit prevents the TX signal from feeding back to RX signal.

As for this unit, TX signal feed back from U3 is canceled by AC3 and so on.

15.6. Transmitter/ReceiverBase Unit and Handset are mainly consists of RF (Radio Frequency) IC(U1) and CPU(U1).

Base Unit and Handset transmit/receive voice signal and data signal through the antenna on carrier frequency.

Signal Pass:

*Refer to CDL TX/RX in SIGNAL ROUTE (P.54).

15.6.1. Transmitter Block

Circuit Operation:

The voice signal input from the TEL LINE interface goes to RF IC(U1) as shown in

BLOCK DIAGRAM (BASE UNIT) (P.45).

And the signal goes through the compressor and SPLATTER FILTER of RF IC, it is output to transmitter circuit.

The signal of the data sent to the handset is applied too.

The capacitor of VARICAP (:VD502) is changing in accordance with the voice signal from telephone line interface or TX DATAsignal from CPU. Therefore, the carrier frequency which is generated by TXVCO will be changing, and Frequency modulatedRF signal is generated and amplified by RF AMP (Doubler: Q510). It pass through the Duplexer FL501 and radiated fromAntenna.

Handset detects the voice signal or data signal in the circuit same as the following explanation of Receiver Block.

15.6.2. Receiver Block

Circuit Operation:

The signal of 900MHz band (925.9~927.85MHz) which is input from ANT is filtered at FL501 as shown in BLOCK DIAGRAM(BASE UNIT) (P.45), then it is input to RF IC.

The signal input to RF IC is converted through Mixer, IF filter (CF501) and Expander.

In short 1st local frequency is mixed with the received RF signal. Then it passes through IF (CF501: 10.7 MHz IntermidiateFrequency) and filtered at F1.

The detected signal passes through the expander and Amplifier inside of RF IC to the TEL LINE interface.

RX data (from Handset):

The data signal from handset (ex: Talk, ACK, COM) is also included in 900 MHz band same as the voice data. After secondif filter, the data signal is made square shape by data limiting AMP of the RF IC. RX data is output to CPU (RX Data).

49

KX-TC1488LBB

15.7. Calling Line ldentification Circuit (Caller ID)Function:

The caller ID is a chargeable ID which the user of a telephone circuit obtains by entering a contract with the telephone companyto utilize a caller ID service. For this reason, the operation of this circuit assumes that a caller ID service contract has beenentered for the circuit being used.

The Caller-ID data from exchange is supplied to the telephone using either method of FSK or DTMF. The method is chosenaccording to the exchange of telephone office. This unit is available to receive the data with both methods and displays thereceived data on LCD.

· FSK (Frequency Shift Keying) format

<Fig. 104>

· DTMF format

It is the method to send the telephone number of calling party with DTMF to the telephone. DTMF is sent before the first bellsignal.

The data is sent in turn; first the start code, secondly the telephone number of calling party, lastly end code.

The DTMF is chosen from A(1633Hz and 697Hz), B(1633Hz and 770Hz), C(1633Hz and 852Hz) and D(1633Hz and 941Hz) asthe start code and end code according to the exchange.

<Fig. 105>

15.8. Caller ID Detection · FSK

U1 is an CPU and a Caller ID detector IC in one. The Caller ID part is capable of detecting FSK CID type 1. During type 1 CID,this IC is interfaced at telephone line through 1000pF/2KV capacitors C10 & C11. All decoded data are then sent to the Handsetfor storage and display.

· DTMF

U4 dose all the jobs for DTMF caller ID decoding. It is a complete receiver integrated both the band split and digital decoderfunctions. Coupled to the line interface through C45 & C53, the decoded DTMF signal is processed and sent to the CPU (U1)through four parallel data ports. Similar to the process of FSK memory storage, all decoded data are sent to the Handset forstorage and display.

Signal Pass :

Refer to SIGNAL ROUTE (P.54).

Depending on the areas, Startcode and Endcode cannot be input.

50

KX-TC1488LBB

16 B

LOC

KD

IAG

RA

M(H

AN

DS

ET

)

LNA

RX

Q51

0

X2

TX

_DAT

A

LPF

BU

FF

ER

92X

.XX

MH

z

DU

PLE

X

Q55

5,Q

556

90X

.XX

MH

z

10.7

MH

z

Q50

9V

CO

TX

X2

445.

7~44

6.67

5 M

Hz

Q50

6V

CO

CO

MP

OS

C

PLLTX

RX

OS

C

LPF

LPF

462.

95~

463.

925

MH

z

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DE

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LF

IF A

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IF A

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3.3V

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LIG

HT

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300m

s

600m

s

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2KX

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24C

16

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LK

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ED

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/PR

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OF

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RX

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R

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PO

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7153

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3.3V

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CB

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2M

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(RF

IC)

U1

(CP

U)

U1

KX

-TC

1488

LBB

: BLO

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GR

AM

(H

AN

DS

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U2

U3

KX-TC1488LBB

51

17 CIRCUIT OPERATION (HANDSET)17.1. Outline

Handset consist of the following ICs as shown in BLOCK DIAGRAM (HANDSET) (P.51).

· CPU: U1

− − − − All data signals (forming/analyzing ACK or CMD signal*)

− − − − All interfaces (ex; LED, Key, Buzzer, Detector Circuit, Charge, Battery Low)

− − − − RAM for keeping the data (CH Number, ID Code, etc.)

− − − − LCD driver/controller

· RF IC: IC1

− − − − PLL Oscillator

− − − − Compress/Expander

− − − − Amplifier for transmission and reception

· EEPROM: U2

− − − − Store Caller ID list and phone book

17.2. Reset Circuit/Charge CircuitThe power of handset is supplied by battery.

Whenever the battery is recharged, the impulse at CHG1 becomes Reset signal through C7, and sent to CPU.

Whenever the battery is inserted, Reset signal is sent through Q5 to CPU.

*Refer to Charge Circuit (P.48).

52

KX-TC1488LBB

17.3. Battery Low / Power Down DetectorCircuit Operation:

“Battery Low” and “Power Down” are detected by RF IC which check the voltage from battery. Shortly, every detected blocksare inside of RF IC. The detected voltage is as follows;

· Battery Low

The CPU detects this level and IN USE “ ” starts flashing.

· Power Down

The output of RF IC (PD-OUT) becomes low level, then CPU detected this signal.

Next, CPU control Q10 by “PWR-DWN“ signal to cut the voltage supplied to most of Handset circuits.

<Fig. 202>

53

KX-TC1488LBB

18 SIGNAL ROUTEEach signal route is as follows.

54

KX-TC1488LBB

19 CPU DATA (BASE UNIT)

19.1. U1Pin No. Port Name Initial I/O Description Remark1 TXPWR H O TX Power control L: Tx power on2 CHG_OPT L O Charge mode control L: Trickle charge mode

H: Normal charge mode3 TX_DATA L O TX path data output4 INUSE_LED H O INUSE/CARGE LED control L: on5 MBR H O Make/Brake ratio select L:60/40 - (TC1485)

H:33/676 PAGE H I Locator botton status L: on7 CASMUTE/FLASHO L O CAS tone detect test point / Flash time option-0 (CASMUTE not used)8 RING_DET - I Ringer detect9 EIU - I 15/20 digit CID selection H: 15-digit CID

L: 20-digit CID - (TC1485)10 STD - I DTMF CID selection / DTMF Receiver Delayed Steering

outputH: DTMF Receiver present

11 ATE/FLASH1 - O CID IRQ Image signal / Flash time option-1 Flash Time Setting:[ pin 11, pin 7 ]0,0 : 100ms0,1 : 300ms1,0 : 600ms - (TC1485)1,1 : 730ms

12 DTMF - O DTMF Output Analog output13 LRIN - I Line Reversal input (Ring Input)14 VDDA - Analog Power supply15 VREF - I Referece voltage for Op-amp signals16 INS - I Op-amp single-ended signal input.17 INP - I Op-amp positive signal input for FSK18 INN - I Op-amp negative signal input for FSK19 OUT - O Op-amp output signal for FSK20 VSSA - Analog GND21 N.C no connection22 PLL_EN L O Serial data communication signal (Strobe)23 PLL_DATA L O Serial data communication signal (Data)24 PLL_CLK L O Serial data communication signal (CLOCK)25 CHG_DET - I Charge detect L: charge26 RX_DATA - I RX path data input27 SIG_OUT - I Carrier detect input (RF IC sigout) / Squelch input H: carrier present (RSSI)

L: out of range (squelchinput)

28 N.C reserved H29 LB_DET - I Not used H30 TADANS - Not used L31 VDD - Digital Power supply32 VSS - Digital GND33 XOUT - O 3.579MHz crystal oscillator34 XIN - I 3.579MHz crystal oscillator35 TEST - I Test signal input L36 RECRADLE L O Recradle control L: recradle37 HSREMT - reserved H38 RESET - I Reset L: Reset39 LNSEIZE L O Line seize control H: seize line40 Q1 - I DTMF decode signal input41 Q2 - I DTMF decode signal input42 Q3 - I DTMF decode signal input43 Q4 - I DTMF decode signal input44 CAS_ATT - O TXDATA attenuator during CAS. (CAS_ATT not used)

55

KX-TC1488LBB

19.2. U4 (DTMF CID IC)Pin No. Port Name I/O Description Remark1 IN+ I Non-Inverting input connection to the front-end differential amplifier2 IN- I Inverting Input connection to the front-end differential amplifier3 GS O Gain select. Gives access to output of front-end differential amplifier

for connection of feedback resister.4 VREF O Reference voltage output,nominally VDD/2.5 IC I Inhibit the detection of 1633Hz H: inhibit6 ICP I Power down H: Power down7 OSC1 I Clock input(3.579545MHz crystal connected)8 OSC2 O Output internal osciloator.(3.579545MHz crystal connected)9 VSS GND10 TOE I 3-state data output(Q1-Q4) enable H: enable11 Q1 O 3-state data output(provide the code corresponding to tone-pair

received)12 Q2 O 3-state data output Analog output13 Q3 O 3-state data output14 Q4 O 3-state data output15 STD O Delayed steering output H: registered and output latch

updated16 EST O Early steering output.17 ST/GT I/O Steering input/guard time output18 VDD Power supply

19.3. Digital Security Coding SystemEvery time the handset is put on the charging cradle of base unit, a 16-bit digital security code is generated and exchangedbetween base and handset. The security code is randomly selected amongst 65536 combinations. This is to comply with FCCPart 15.214(d) requirement.

56

KX-TC1488LBB

20 CPU DATA (HANDSET)

20.1. U1Pin No. Port Name Initial I/O Description Remark

1 VSS - Power Ground2 XIN - I 4MHz crystal oscillator input3 XOUT - O 4MHz crystal oscillator output4 TEST - I Test pin for out-going test. L5 VDD - Power supply6 LC_DET H I Battery Low detect signal input L: Battery Low7 RXPWR L O RX power control L: Power on8 RESET H I Reset L: Reset9 PD_OUT H I Power down detect signal input L: Power down10 CBOSTB L O Serial communication signal (Strobe)11 RX_DATA L I Rx path data input12 TX_DATA L O Tx path data input13 KEY_R4 L I Key scan signal row 414 KEY_R3 L I Key scan signal row 315 KEY_R2 L I Key scan signal row 216 KEY_R1 L I Key scan signal row 117 KEY_R0 L I Key scan signal row 018 VAREF - MCU reserve pin19 PWR_DWN - O Power Down control output L: Normal operation

H: Power Down20 BACKLIGHT H O Backlight Control L: Backlight on21 TXPWR L O TX power control L: Power on22 KEY_C4 L O Key scan signal column 423 KEY_C3 L O Key scan signal column 324 KEY_C2 L O Key scan signal column 225 KEY_C1/LB_DET L O Key scan signal column 126 KEY_C0/CHG_DET L O Key scan signal column 027 SIG_OUT L I Combo signal input28 CBOD/EEPD L I/O Combo Data / E2prom data29 CBOCLK L O Combo clock30 BUZZER - O Buzzer output L: on

H: off31 EEPCLK L O E2prom clock32 RINGER_SW L I Ringer On / Off H: on33 ATE - I Cradle Detect input L: Cradle detect34 SEG44 - O LCD segment interface35 SEG43 - O LCD segment interface36 SEG42 - O LCD segment interface37 SEG41 - O LCD segment interface38 SEG40 - O LCD segment interface39 SEG39 - O LCD segment interface40 SEG38 - O LCD segment interface41 SEG37 - O LCD segment interface42 SEG36 - O LCD segment interface43 SEG35 - O LCD segment interface44 SEG34 - O LCD segment interface45 SEG33 - O LCD segment interface46 SEG32 - O LCD segment interface47 SEG31 - O LCD segment interface48 SEG30 - O LCD segment interface49 SEG29 - O LCD segment interface50 SEG28 - O LCD segment interface51 SEG27 - O LCD segment interface52 SEG26 - O LCD segment interface53 SEG25 - O LCD segment interface54 SEG24 - O LCD segment interface55 SEG23 - O LCD segment interface56 SEG22 - O LCD segment interface57 SEG21 - O LCD segment interface58 SEG20 - O LCD segment interface59 SEG19 - O LCD segment interface60 SEG18 - O LCD segment interface

57

KX-TC1488LBB

Pin No. Port Name Initial I/O Description Remark61 SEG17 - O LCD segment interface62 SEG16 - O LCD segment interface63 SEG15 - O LCD segment interface64 SEG14 - O LCD segment interface65 SEG13 - O LCD segment interface66 SEG12 - O LCD segment interface67 SEG11 - O LCD segment interface68 SEG10 - O LCD segment interface69 SEG09 - O LCD segment interface70 SEG08 - O LCD segment interface71 SEG07 - O LCD segment interface72 SEG06 - O LCD segment interface73 SEG05 - O LCD segment interface74 SEG04 - O LCD segment interface75 SEG03 - O LCD segment interface76 SEG02 - O LCD segment interface77 SEG01 - O LCD segment interface78 SEG00 - O LCD segment interface79 COM00 - O LCD command interface80 COM01 - O LCD command interface81 COM02 - O LCD command interface82 COM03 - O LCD command interface83 COM04 - O LCD command interface84 COM05 - O LCD command interface85 COM06 - O LCD command interface86 COM07 - O LCD command interface87 COM08 - O LCD command interface88 COM09 - O LCD command interface89 COM10 - O LCD command interface90 COM11 - O LCD command interface91 COM12 - O LCD command interface92 COM13 - O LCD command interface93 COM14 - O LCD command interface94 COM15 - O LCD command interface95 V4 - I LCD bias96 V3 - I LCD bias97 V2 - I LCD bias98 V1 - I LCD bias99 C1 - I LCD power booster100 C0 - I LCD power booster

58

KX-TC1488LBB

21 EXPLANATION OF IC TERMINALS (RF UNIT)21.1. U1

Pin No. Pin Description Pin No. Pin Description1 EN Enable input 29 QUAD_IN FM detector input2 CDET COMP detection 30 QUAD_OUT IFamp2 output3 SF_OUT Splatter filter output 31 NDET Noise Detection4 SFC2 External splatter filter 32 RSSI_DET RSSI Detection5 SFC1 COMP output 33 2NDIF_IN IFamp2 input6 COMP_DC COMP output VREF 34 IFREF1 IFamp2 VREF7 POWERSAVE Power Save input 35 1STIF_OUT IFamp1 output8 MIC_OUT Microphone amp output 36 VCC1 VCC19 MIC_IN Microphone amp input 37 1STIF_IN IFamp1 input

10 BREF Audio system reference output 38 GND1 Ground 111 PD_OUT Power Down output 39 RXVCC RX-counter VCC12 VCC2 VCC2 40 PDL BL, PD threshold selection13 DOUT Data amp output 41 VSS RX-counter Gnd14 GND2 Ground 2 42 FIN_RX RX-counter input15 SPOUT2 SP amp output 1 43 SIGOUT LD, RSSI, ND output16 SPOUT1 SP amp output 2 44 BATTLOW BatteryLow output17 SPIN SP amp input 45 VSSS Logic Gnd18 PE Half-Mute detection 46 RXPD RX-phase comparator output19 ZAP ZAP write 47 PLLREG Logic Power Source Output20 GND3 Ground 3 48 TX_PD TX-phase comparator output21 EXPOUT EXP output 49 TXVCC3 TX-counter Vcc22 DIN Data amp input 50 FIN_TX TX-counter input23 EDET EXP detection 51 TXVSS TX-counter Gnd24 PRE_OUT Pre-amp output 52 OSCI Xtal oscillator input25 PRE_IN Pre-amp input 53 OSCO Xtal oscillator output126 DET_OUT FM Detector output 54 Xtal oscillator output227 NF_IN Noise filter input 55 DATA Serial data input28 NF_OUT Noise filter output 56 CLK Click input

59

KX-TC1488LBB

22 HOW TO REPLACE AFLAT PACKAGE IC

22.1. Preparation · PbF (: Pb free) Solder

· Soldering Iron

Tip Temperature of 700°F ± 20°F (370°C ± 10°C)

Note: We recommend a 30 to 40 Watt soldering iron. Anexpert may be able to use a 60 to 80 Watt iron wheresomeone with less experience could overheat and damagethe PCB foil.

· Flux

Recommended Flux: Specific Gravity → 0.82.

Type → RMA (lower residue, non-cleaning type)

Note: See ABOUT LEAD FREE SOLDER (PbF: Pb free)(P.4).

22.2. Procedure 1. Tack the flat pack IC to the PCB by temporarily soldering

two diagonally opposite pins in the correct positions on thePCB.

2. Apply flux to all of the pins on the IC.

3. Being careful to not unsolder the tack points, slide thesoldering iron along the tips of the pins while feedingenough solder to the tip so that it flows under the pins asthey are heated.

22.3. Removing Solder fromBetween Pins

1. Add a small amount of solder to the bridged pins.

2. With a hot iron, use a sweeping motion along the flat part ofthe pin to draw the solder from between the adjacent pads.

60

KX-TC1488LBB

23 CABINET AND ELECTRICAL PARTS LOCATION (BASEUNIT)

61

KX-TC1488LBB

24 CABINET AND ELECTRICAL PARTS LOCATION(HANDSET)

62

KX-TC1488LBB

25 ACCESSORIES AND PACKING MATERIALS

63

KX-TC1488LBB

26 TERMINAL GUIDE OF THE ICs TRANSISTORS ANDDIODES

26.1. Base Unit

26.2. Handset

64

KX-TC1488LBB

27 REPLACEMENT PARTSLIST

1. RTL (Retention Time Limited)

Note:

The marking (RTL) indicates that the Retention Time islimited for this item.

After the discontinuation of this assembly in production,the item will continue to be available for a specific periodof time. The retention period of availability depends onthe type of assembly and the laws governing parts andproduct retention. At the end of this period, theassembly will no longer be available.

2. Important safety notice

Components identified by the mark indicates specialcharacteristics important for safety. When replacing any ofthese components, only use specified manufacture’s parts.

3. The S mark means the part is one of some identical parts.For that reason, it may be different from the installed part.

4. RESISTORS & CAPACITORS

Unless otherwise specified;

All resistors are in ohms (Ω) K=1000Ω, M=1000kΩ

All capacitors are in MICRO FARADS (µF)P=µµF

*Type & Wattage of Resistor

27.1. Base Unit

27.1.1. Cabinet and Electrical PartsRef.No.

Part No. Part Name & Description Remarks

1 151023402301 TERMINAL, CHARGE

2 170023700010 ANTENNA

3 401390021780 CABINET BODY

4 402401220370 CABINET COVER

5 407400020376 PLATE, FIXING

6 408400020370 LEVER, HOOK

7 408401020376 BUTTON, HANDSET LOCATOR

8 410207100000 KEYBOARD SWITCH

9 432243511000 NAME PLATE

10 PQWCTC1461LA SHIELD, RF

11 407400020370 STAND, WALL MOUNT

Ref.No.


12 460100301010 RUBBER PARTS, FOOT

27.1.2. Main P.C.Board PartsRef.No.


PCB1 PQWP11488LBH MAIN P.C.BOARD ASSÝ (RTL)

(ICs)

U1 590225100000 IC (*1) S

U2 270074020012 IC S

U3 271002409030 IC S

U4 274097001007 IC S

(TRANSISTORS)

Q1 203904010000 TRANSISTOR(SI) S










(DIODES)

D1 214418021000 DIODE(SI) S

D2 214418021000 DIODE(SI) S

D4 214004030007 DIODE(SI) S

D5 214418000000 DIODE(SI) S

D6 214418021000 DIODE(SI) S

D7 214418021000 DIODE(SI) S

D8 214418021000 DIODE(SI) S

D9 214418021000 DIODE(SI) S

D10 214418021000 DIODE(SI) S

D11 214418021000 DIODE(SI) S

D12 214418000000 DIODE(SI) S

D13 214404000000 DIODE(SI) S

ZD1 212560600000 DIODE(SI) S

ZD10 212750600000 DIODE(SI) S

(COILS)

L1 392000211000 COIL S

L2 252100200128 COIL S

L3 252680300000 COIL S

L6 252680300000 COIL S

L7 252680300000 COIL S

L9 252100300000 COIL S

L10 252100300000 COIL S

(CONNECTORS AND JACKS)

CON1 311049020000 CONNECTOR S

CON2 311153020600 CONNECTOR S

DC+- 301000700004 JACK S

JACK 300223407032 TEL JACK S

(CRYSTAL OSCILLATORS)

X1 260359500026 CRYSTAL OSCILLATOR S


R1 ERDS2TJ220 22

R3 ERJ3GEYJ152 1.5K

R4 ERJ3GEYJ202 2K

R5 ERJ3GEYJ393 39K

R6 ERJ3GEYJ683 68K

R7 ERJ3GEY0R00 0

R8 ERJ3GEYJ275 2.7M

R9 ERJ3GEYJ102 1K

R11 ERJ3GEYJ304 300K

R12 ERJ3GEYJ363 36K

R15 ERJ3GEYJ103 10K

R16 ERJ3GEYJ302 3K


R18 ERJ3GEYJ163 16K

R19 ERJ3GEYJ473 47K

R21 ERJ3GEYJ153 15K

R22 ERJ3GEYJ683 68K


R24 ERJ3GEYJ561 560

65

KX-TC1488LBB

Ref.No.


R25 ERJ6GEYJ220 22

R27 ERJ3GEYJ473 47K

R28 ERJ3GEY0R00 0

R29 ERJ3GEYJ223 22K

R30 ERJ3GEYJ122 1.2K

R31 ERJ3GEYJ202 2K

R32 ERJ3GEYJ103 10K

R33 ERD25TJ510 51



R36 ERJ3GEYJ203 20K


R39 ERJ3GEYJ103 10K





R44 PQMGC25TJ206 20M

R45 PQMGC25TJ206 20M


R47 ERDS2TJ220 22

R48 ERJ3GEYJ103 10K

R49 ERD25TJ104 100K

R50 ERD25TJ104 100K

R51 PQMGC50TJ120 12


R53 ERJ3GEYJ243 24K

R54 ERJ3GEYJ103 10K

R55 ERJ3GEYJ103 10K

R56 ERDS2TJ103 10K

R57 ERJ3GEYJ103 10K

R58 ERJ3GEYJ103 10K

R59 ERJ3GEYJ471 470


R61 ERJ3GEYJ103 10K

R63 ERJ3GEYJ103 10K

R64 ERJ3GEYJ105 1M

R65 ERJ3GEYJ103 10K




R69 ERJ3GEYJ103 10K


R71 ERJ3GEYJ223 22K

R72 ERJ3GEYJ471 470

R73 ERJ3GEYJ473 47K

R74 ERD25TJ201 200

R75 ERJ3GEYJ103 10K

R77 ERJ3GEYJ473 47K


R79 ERD25TJ220 22

R81 ERJ3GEYJ473 47K

R82 ERJ3GEYJ153 15K


R84 ERJ3GEYJ103 10K



R87 ERJ3GEYJ105 1M

R89 ERD25TJ564 560K

R90 ERD25TJ564 560K

R91 ERJ6GEYJ470 47

R92 ERJ3GEYJ123 12K

R93 ERJ3GEYJ103 10K

R94 ERJ3GEYJ123 12K

R95 ERJ3GEYJ105 1M


R97 ERD25TJ154 150K

R98 ERJ3GEYJ473 47K

R99 ERJ3GEYJ473 47K





Ref.No.



R110 ERD25TJ390 39







R122 ERD25TJ563 56K


AR5 ERJ3GEYJ104 100K

AR5 ERJ3GEYJ154 150K

AR5 ERJ3GEYJ183 18K

AR5 ERJ3GEYJ273 27K

AR5 ERJ3GEYJ473 47K

AR5 ERJ3GEYJ563 56K

AR5 ERJ3GEYJ683 68K

AR5 ERJ3GEYJ823 82K

AR5 ERJ3GEYJ363 36K

AR5 ERJ3GEYJ513 51K

AR6 ERJ3GEYJ123 12K

AR6 ERJ3GEYJ473 47K

AR6 ERJ3GEYJ563 56K

AR6 ERJ3GEYJ683 68K

AR6 ERJ3GEYJ823 82K

AR6 ERJ3GEYJ303 30K

AR6 ERJ3GEYJ363 36K

AR6 ERJ3GEYJ913 91K

JR2 ERJ3GEY0R00 0

JR3 ERJ3GEY0R00 0

JR4 ERJ3GEY0R00 0

JR5 ERJ3GEY0R00 0

JR8 ERJ6GEY0R00 0

JR10 ERJ3GEY0R00 0

JR11 ERJ3GEY0R00 0

JR12 ERJ3GEY0R00 0

(CAPACITORS)

C1 ECUV1H221JCV 220P

C2 ECUV1C104JFV 0.1

C3 ECUV1C104ZFV 0.1

C4 ECUV1C104ZFV 0.1

C6 ECUV1C104ZFV 0.1

C7 ECUV1C104ZFV 0.1

C8 ECUV1H103KBV 0.01

C9 ECUV1C104ZFV 0.1

C10 220102350900 1000 S

C11 220102350900 1000 S

C13 PQCUV1C105JCV1

C14 PQCUV1C105ZF 1

C16 ECUV1C224KBV 0.22

C17 220101681300 2.2

C18 ECUV1H101JCV 100


C20 ECUV1C104ZFV 0.1

C22 ECUV1H150JCV 15




C28 ECUV1H471KBV 470p



C31 PQCUV1H224KB 0.22

C32 223561150000 5600 S

C33 ECUV1E273KBV 0.027


C36 220101681309 0.01

C37 220101681309 0.01


C41 ECUV1H270JCV 27

C45 220102350900 1000 S


C48 ECUV1H560JCV 56


66

KX-TC1488LBB

Ref.No.





C53 220102350900 1000 S


C55 PQCUV1C104ZFV0.1

C56 240100681700 0.1 S

C57 PQCUV1C105JCV1

C58 ECUV1H120JCV 12


C60 PQCUV1C105JCV1








C68 ECUV1H150JCV 15

C73 ECUV1H222KBV 0.0022


C97 ECUV1C104JFV 0.1

AC3 ECUV1C224KBV 0.22

EC1 ECA1AM471B-J 470

EC2 ECA1CM101B 100

EC3 ECEA1AKA221 220

EC4 221470360100 470 S

EC5 ECA1CM101B 100

EC7 ECEA1CKA470B 47

EC8 ECEA1CKA102 1000

EC9 ECEA1HKA100B 10

EC10 ECEA1CKA470B 47

EC11 ECA1CM101B 100

EC12 ECA1CM101B 100

EC16 ECEA1HKA4R7B 4.7

EC18 ECEA1HKA4R7B 2.2

EC19 ECEA1HKA100B 10

(OTHERS)

F1 218250800111 THERMISTOR S

RLY1 254080000013 RELAY S

T4 258194190005 TRANSFORMER S

VC1 280300400000 TRIMMER CAPACITOR S

VDR1 218170900001 VARISTOR S

Note) *1: It is impossible to replace U1 by itself. To replaceU1, replace the PCB1 assembly.

27.1.3. Locator P.C.Board PartsRef.No.


PCB2 PQWP21485LAH LOCATOR P.C.BOARD ASSÝ (RTL)

(LED)

LED1 335181605805 LED S

27.1.4. RF P.C.Board PartsRef.No.


PCB3 PQWP31485LAH RF P.C.BOARD ASSÝ (RTL)

(IC)

U1 274085313220 IC S

(TRANSISTORS)







(DIODES)

D1 214418021000 DIODE(SI) S

D2 214418021000 DIODE(SI) S

Ref.No.


VD501 213024010006 DIODE(SI) S

VD502 213024010006 DIODE(SI) S

(CERAMIC FILTERS)

CF501 264100051046 CERAMIC FILTER S

F1 264100051046 CERAMIC FILTER S

(COILS)

L502 253200830200 COIL S

L503 253300830010 COIL S

L504 252330201801 COIL S

(RESISOTRS)

R1 ERJ3GEYJ153 15K

R2 ERJ3GEY0R00 0

R3 ERJ3GEYJ273 27K

R4 ERJ3GEYJ104 100K

R6 ERJ3GEYJ152 1.5K

R8 ERJ3GEYJ224 220K

R9 ERJ3GEYJ274 270K

R10 ERJ3GEYJ303 30K

R11 ERJ3GEYJ563 56K

R12 ERJ3GEYJ333 33K

R15 ERJ3GEYJ683 68K


R17 ERJ3GEYJ223 22K


R19 ERJ3GEYJ273 27K

R20 ERJ3GEYJ183 18K

R21 ERJ3GEYJ223 22K


R503 ERJ3GEYJ330 33

R504 ERJ3GEYJ102 1K

R509 ERJ3GEYJ102 1K

R510 ERJ3GEYJ390 39

R511 ERJ3GEYJ181 180




R517 ERJ3GEYJ100 10










R541 ERJ3GEYJ102 1K







R571 ERJ3GEYJ102 1K



R585 ERJ3GEY0R00 0

R593 ERJ3GEYJ102 1K






R619 ERJ3GEY0R00 0

R621 ERJ3GEY0R00 0

R622 ERJ3GEY0R00 0

C564 ERJ3GEY0R00 0

C582 ERJ3GEY0R00 0

(CAPACITORS)

C1 ECUV1H470JCV 47P

C2 ECUV1C104JCV 0.1

C3 ECUV1C105ZFV 1

C4 ECUV1H040CCV 4P

67

KX-TC1488LBB

Ref.No.


C6 ECUV1C104JCV 0.1

C7 ECUV1H330JCV 33p

C8 ECUV1C104ZFV 0.1

C9 ECUV1C104ZFV 0.1

C10 PQCUV1C105ZF 1

C11 PQCUV1C225ZF 2


C13 ECUV1H473KB 0.047


C15 ECUV1H473KB 0.047


C19 ECUV1C104JCV 0.1









C30 PQCUV1C105ZF 1



C33 ECUV1C105ZFV 1

C34 ECUV1H222KBV 0.0022

C35 ECUV1H682KBV 0.0068


C37 ECUV1H010CCV 1P


C39 ECUV1H121JCV 120p




C502 ECUV1H102KBV 0.001




C519 ECUV1H070CCV 7P





C533 ECUV1H100DCV 10P

C534 PQCUV1C105ZF 1


C536 ECUV1H123KBV 0.012


C538 PQCUV1C105ZF 1


C541 ECUV1H102KBV 0.001







C556 ECUV1H102KBV 0.001

C559 PQCUV1C224KB 0.22

C560 ECUV1H102KBV 0.001



C563 ECUV1H222KBV 0.0022




C568 ECUV1H102KBV 0.001


C570 ECUV1H102KBV 0.001

C571 ECUV1H680JCV 68p





Ref.No.






C591 ECUV1H123KBV 0.012








C604 ECUV1H222KBV 0.0022


ESC10 ECUV1C104ZFV 0.1

R13 ECUV1H102KBV 0.001

(OTHERS)

FL501 251902140418 DUPLEX S

T1 250076000014 TRANS S

27.2. Handset

27.2.1. Cabinet and Electrical PartsRef.No.


101 407390022255 PANEL, LCD

102 472042052010 ADHESIVE TAPE

103 407391020370 ANTENNA

104 461001000000 COVER, SPEAKER

105 332285301014 SPEAKER

106 403390321780 CABINET BODY

107 432243500000 NAME PLATE

108 470312501000 SPACER

109 420197100000 SHEET, PVC COVER

110 463102300000 COVER, HEADSET

111 408400020446 BUTTON, KEY

112 410205008100 KEYBOARD SWITCH

113 408392020370 LEVER, RINGER

114 464100000010 RUBBER

115 PQWCTC1461LA SHIELD, RF

116 337224314010 LCD BACK LIGHT



119 404390420440 CABINET COVER

120 PQWBTC1461 BATTERY, NI-CD

121 470216031000 CUSHION

122 406390020370 RID, BATTERY

123 470011001180 SPACER, CUSHION LCD

124 154013605011 GUIDE, LCD

125 470025001020 SPACER, CUSHION LCD

126 334218000000 LIQUID CRYSTAL DISPLAY

127 463001960010 CONNECTOR

128 420204005000 SHEET, PET

27.2.2. Main P.C.Board PartsRef.No.


PCB100 PQWP11485LAR MAIN P.C.BOARD ASSÝ (RTL)

(ICs)

U1 273022514012 IC S

U2 272021627070 IC S

U3 271713328032 IC S

(TRANSISTORS)








(DIODES)

68

KX-TC1488LBB

Ref.No.


D1 214418021000 DIODE(SI) S

D2 214004030007 DIODE(SI) S

D3 214418021000 DIODE(SI) S

D4 214418021000 DIODE(SI) S

D8 214418021000 DIODE(SI) S

D9 214418021000 DIODE(SI) S

D10 214418021000 DIODE(SI) S

D11 214418021000 DIODE(SI) S

D15 214418021000 DIODE(SI) S

ZD2 212560670000 DIODE(SI) S

LED1 335181605805 LED S

LED7 335151600016 LED S

LED8 335151600016 LED S

LED9 335151600016 LED S

LED10 335151600016 LED S

(COILS)

L1 252680300000 COIL S

L2 252680300000 COIL S

(RESISTORS)

R1 ERJ3GEYJ222 2.2K

R2 ERJ3GEYJ104 100K

R3 ERJ3GEYJ104 100K

R4 ERJ3GEYJ475 4.7M

R5 ERJ3GEYJ104 100K

R6 ERJ3GEYJ472 4.7K



R13 ERJ6GEYJ470 47





R19 ERJ3GEYJ103 10K


R21 ERJ3GEYJ103 10K

R23 ERJ3GEYJ473 47K

R25 ERJ3GEY0R00 0

R28 ERJ3GEYJ473 47K

R29 ERJ3GEYJ473 47K

R30 ERJ3GEYJ473 47K

R31 ERJ3GEY0R00 0

R32 ERJ3GEYJ103 10K


R35 ERJ3GEYJ103 10K

R37 ERJ3GEYJ330 33

R38 ERJ3GEYJ470 47




R46 ERJ3GEYJ473 47K

R47 ERJ3GEYJ473 47K

R48 ERJ3GEYJ103 10K


R53 ERJ3GEYJ473 47K

R55 ERJ3GEYJ223 22K

R57 ERJ3GEYJ103 10K

R58 ERJ3GEY0R00 0

R61 ERJ6GEYJ220 22

R64 ERJ3GEY0R00 0

R65 ERJ3GEYJ473 47K

R67 ERJ3GEYJ103 10K

R68 ERJ3GEY0R00 0





R89 ERJ3GEYJ203 20K

R9 ERJ3GEYJ473 47K

R90 ERJ3GEY0R00 0

R91 ERJ3GEY0R00 0

(CAPACITORS)

C1 PQCUV1C225ZF 2.2

C2 PQCUV1C104ZF 0.1

Ref.No.


C3 PQCUV1C225ZF 2.2

C4 PQCUV1C225ZF 2.2

C6 ECUV1C104ZFV 0.1

C7 PQCUV1C105ZF 1


C9 ECUV1C104ZFV 0.1


C11 PQCUV1C104ZF 0.1





C18 ECUV1H100JBV 10P





C31 PQCUV1C105ZF 1






C60 ECUV1H270JBV 27

C64 PQCUV1C105ZF 1


C102 ECUV1H102KBV 1000P

C103 ECUV1H102KBV 1000P


EC1 ECEA1CKA101B 100

(OTHERS)

BATT 310020040018 BATTERY JACK S

CN2 311153520500 FLAT CABLE S

E101 330128051107 RINGER S

E102 333609700103 MICROPHONE S

E103 324124008040 SLIDE SWITCH S

VC1 280300510007 VARIABLE CAPACITOR S


27.2.3. RF P.C.Board PartsRef.No.


PCB200 PQWP21485LAR RF P.C.BOARD ASSÝ (RTL)

(IC)

U1 274085313220 IC S

(TRANSISTORS)







(DIODES)

VD501 213024010006 DIODE(SI) S

VD502 213024010006 DIODE(SI) S

(CERAMIC FILTERS)

CF501 264100051046 CERAMIC FILTER S

F1 264100051046 CERAMIC FILTER S

(COILS)

L502 253200830200 COIL S

L503 253300830010 COIL S

L504 252330201801 COIL S

FL501 251902040518 CERAMIC FILTER S

(RESISTORS)

R1 ERJ3GEYJ153 15K

R2 ERJ3GEY0R00 0

R3 ERJ3GEYJ273 27K

R4 ERJ3GEYJ104 100K

R6 ERJ3GEYJ152 1.5K

R8 ERJ3GEYJ393 390K

R9 ERJ3GEYJ274 270K

R10 ERJ3GEYJ153 15K

69

KX-TC1488LBB

Ref.No.


R11 ERJ3GEYJ513 51K

R12 ERJ3GEYJ273 27K



R17 ERJ3GEYJ223 22K




R503 ERJ3GEYJ330 33

R504 ERJ3GEYJ102 1K

R509 ERJ3GEYJ102 1K

R510 ERJ3GEYJ5R1 5.1





R517 ERJ3GEYJ100 10










R541 ERJ3GEYJ102 1K







R571 ERJ3GEYJ102 1K



R585 ERJ3GEY0R00 0

R593 ERJ3GEYJ102 1K






R619 ERJ3GEY0R00 0

R16A ERJ3GEYJ104 100K









(CAPACITORS)

C1 ECUV1H470JCV 47P

C2 ECUV1C104JCV 0.1

C3 ECUV1H473ZFV 0.047

C4 ECUV1H040CCV 4P


C6 ECUV1C104JCV 0.1


C8 ECUV1C104ZFV 0.1




C13 ECUV1H473KB 0.047

C15 ECUV1H473KB 0.047







Ref.No.





C30 PQCUV1C105ZF 1




C34 ECUV1H681KB 680P


C36 ECUV1H122KBV 0.0012

C37 ECUV1H010CCV 1P



C502 ECUV1H102KBV 0.001









C534 PQCUV1C105ZF 1


C536 ECUV1H123KBV 0.012


C538 PQCUV1C105ZF 1


C541 ECUV1H102KBV 0.001







C556 ECUV1H102KBV 0.001


C560 ECUV1H102KBV 0.001



C563 ECUV1H222KBV 0.0022





C568 ECUV1H102KBV 0.001













C591 ECUV1H123KBV 0.012









C604 ECUV1H222KBV 0.0022


EC1 PQCUV1C225ZF 2.2

EC2 ECEA1HKA3R3 3.3

ESC10 ECUV1C104ZFV 0.1

R13 ECUV1H102KBV 0.001

70

KX-TC1488LBB

Ref.No.


(OTHERS)

T1 250076000014 TRANS S

VR1 237103054905 VARISTOR S

27.3. Accessories and PackingMaterials

Ref.No.


A1 141500720600 CORD, TELEPHONE

A2 PQWATC1468LB AC ADAPTOR

A3 435243101000 CARD, CHARGE

A4 407400020440 HANGER, BELT CLIP

A5 PQQX13621Z INSTRUCTION BOOK

P1 444208319210 ACCESSORY BOX

P2 444203317110 CUSHION

P3 444203317210 CUSHION, ANTENNA

P4 491320121010 PROTECTION COVER (for BaseUnit)

P5 491300010210 PROTECTION COVER (forHandset)

P6 PQPK13999Z CARTON BOX

71

KX-TC1488LBB

28 FOR SCHEMATIC DIAGRAM

28.1. Base Unit (SCHEMATIC DIAGRAM (BASE UNIT)) 1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.

2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

Important Safety Notice:Components identified by mark have special characteristics important for safety. When replacingany of these components, use only the manufacturer´s specified parts.

28.2. Handset (SCHEMATIC DIAGRAM (HANDSET)) 1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.

2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

72

KX-TC1488LBB

28.3. Memo

73

KX-TC1488LBB

29 S

CH

EM

AT

ICD

IAG

RA

M(B

AS

EU

NIT

)29

.1.

Mai

n

KX

-TC

1488

LBB

SC

HE

MAT

IC D

IAG

RA

M (

BA

SE

UN

IT)

Mai

n

U1

U4

TX DT

MF

CID

FS

K C

ID

RX

inpu

t34

7mV

p-p

(-16

dBm

/60

0 )

outp

ut-2

3dB

m

5V

19m

Vp-

p

DT

MF

CID

FS

K C

ID

KX-TC1488LBB

74

29.2

. R

FM

odul

e

1mV

p-p

245m

Vp-

p

109m

Vp-

p

174m

Vp-

p

U1

TX

RX

KX

-TC

1488

LBB

SC

HE

MAT

IC D

IAG

RA

M (

BA

SE

UN

IT)

RF

Mod

ule

1KH

z to

ne25

kHz

Dev

.in

put

1KH

z to

ne25

kHz

Dev

.ou

tput

1.75

±0.

2V 1.8±

0.15

V30

8mV

p-p

2.5m

Vp-

p

KX-TC1488LBB

75

30 S

CH

EM

AT

ICD

IAG

RA

M(H

AN

DS

ET

)30

.1.

Mai

n

212m

Vp-

p(-

20.5

dBm

)

10.7

mV

p-p

INP

UT

1kH

zR

X

TX

KX

-TC

1488

LBB

SC

HE

MAT

IC D

IAG

RA

M (

HA

ND

SE

T)

Mai

n

KX-TC1488LBB

76

30.2

. R

FM

odul

e

RX

TX

U1

8.7m

Vp-

p

1KH

z to

ne25

kHz

Dev

.in

put

1KH

z to

ne25

kHz

Dev

.ou

tput

1.75

±0.

2V

1.8±

0.15

V15

5mV

p-p

55m

Vp-

p0.

9mV

p-p

2.7m

Vp-

p

KX

-TC

1488

LBB

SC

HE

MAT

IC D

IAG

RA

M (

HA

ND

SE

T)

RF

Mod

ule

KX-TC1488LBB

77

30.3

. M

emo

KX-TC1488LBB

78

31 CIRCUIT BOARD (BASE UNIT)

31.1. Main (Component View)

KX-TC1488LBB: BASE UNIT Main (Component View)

PbFU

4

CH-

CH+

L6

L7

J28R

33

R44

R45

C36

C37

J27

J25

J21

J19

J20 J3

6

J33

J1

L2

J3 J39J2

R11

9C

17

R97

TIP

RIN

GVD

R1

J30

J34

J35

J24

J23

R79

J5

J7

J18

R12

2

X2

R50

R49

R89

R90

EC

10

EC

19

R11

0

EC

16

D5

EC6

EC2

EC9

Q1

Q9

J31

R74

EC18

EC11

J12R1

J13

J15J16

J11

J17

W1

EC5

EC12

CON2

CO

N1

EC1

J37

J8

J9

EC7

X1

15 10 5 1

14

J26

J32

EC8

EC4

R47

C53

C45

C11

W1

L1

C10

ZD1

D13

D12

L3

ZD11

DC+

DC-

T4

RL1

L10

F1

F1 300mA250V

L9

R56

C32

VC1

ZD

10

ZD

2

SIG_OUT

PbF

79

KX-TC1488LBB

31.2. Main (Flow Solder Side View)

KX-TC1488LBB: BASE UNIT Main (Flow Solder Side View)

U1

U3

D1Q3

C7C20

C63

R28

R59C16C34C99C65

R55

R7

JR4

R15JR5

JR12

R68R109

R111C52

CAS

ATE

CAS_ATT

EC3

R18

R11

C3

R11

4R12

R65

R66R67

R60TP4

TP1

TP3

JR3R77

D4

R64

C46

C68

D4

2322

11

C22

C8C6

R27

Q5

R73

Q2

Q6

Q7

Q4

Q10

Q8

C2

R26

R108

R17D11

C42R76

C12

U2

R9

R30

+5V AC3C60

TP2

R107

R24

C14

C28R22

R41 R40

C35

C1

R43

AC4

AC2

R42 R8

C19

C74

C55

C64

C56

R51

R72

R48C67

C30

R95

C97

R96

JR11

R94

JR8

R2

R78

R92

C62C

54

R34

R21

R23

R46

R10

4 R10

3R

105

C49

C23

C24

C15

C25

C57

C4R63

R10

0

R98

41

R58

R61

R86

R57

R54

R70

C66

C41

R85

R117

R11

0

R116

R12

5

R12

3R

52

R12

1

JR2

R12

4R

19

R13 D

3R

102

R71

R38

R10

1C

48

C40 R

99

C51

C5

C43C

44C

50

R80

R37

R83R93

R35

R36

R39

R4

R11

5

R69

R91

R53

R82R

6 AR

6

R3R

113

C73

C47

C27 C

13

C58

R87

C18

R81

R88

R14

7

R15

0 R12

0

R11

8

R11

2

R14

C59

R16

R20

C39

C33

C38

R75

D2

C29

D6

R5

AR

5R

106

C26

R32 R

31

R25

C31

R84

R29

R62

C61

D7 D8

D9

D10

C21C9

PbF

80

KX-TC1488LBB

31.3. Locator (Component View)

KX-TC1488LBB: BASE UNIT Locator (Component View)

PbF

31.4. Locator (Flow Solder Side View)

KX-TC1488LBB: BASE UNIT Locator (Flow Solder Side View)

PbF

81

KX-TC1488LBB

31.5. Memo

82

KX-TC1488LBB

31.6. RF Module (Component View)

KX-TC1488LBB: BASE UNIT RF Module (Component View)

R517

R551

R514

R511

R513

R536

C574 C575

C595

C555

R585

C583

C538

C57

0

C50

0

R51

0

R52

4R

522

R54

3

R51

8

R54

4

R59

3

R50

9

R60

4

R4

R13

R10

R8 R61

1R

606

R512

R7

R609

R531

R504

R520

R534

R533

R537

R9

R610

R578

R62

1

R619

C530

C20

C593

C592

C545

C598

C591

L503

L506C4

R571

C559

C556

C560

C562

C586

C567

C557

C12C535

C533

C22C25 C605

CF501

C563

C23

U1

C502

C8

C31

C37

C32

R5

R3

C39

T1

C28

P3

C38

C6

R12

R11R18

R1

R21

C21C16

D1

R30R31 15 10 5 1

ESC8 ESC7

R19

C7

C33

R17

R20

C34

C13

C3

C35C36

R15

C30

C29 C24

C604

L504

R503 R6

R521

R562

R561

R577

C568

Q555

Q556

Q506

Q512

R56

9

R50

1

C57

8

C54

6

C50

3C

582

FL5

01

C59

7

C54

2

C60

0

C56

5

C51

9

C56

4

C56

6

C60

2

Q50

9

L502

L505

VD

501

VD

502

C59

0

C59

9

C54

9C

534

C57

3

C56

9

C52

6

C56

1

C50

4

C54

3

C54

1

C53

7

C55

4

C53

9

C53

6

C15

R622

R11

1

EC

2

D2

C14

C19

C11

C2

R16

EC

1

C17

C18

F1

C9 C10

C5

C40

C55

8

R2

C50

5

ES

C10

C41

C57

2C

527

Q510

C521

C571C1 R541 P

bF

TP510

TP809(TXVCO)

D_OUT

D_IN

Tx Data REC_O/P_A

TP808 (RXVCO)

83

KX-TC1488LBB

31.7. RF Module (Flow Solder Side View)

KX-TC1488LBB: BASE UNIT RF Module (Flow Solder Side View)

PbF

84

KX-TC1488LBB

32 CIRCUIT BOARD (HANDSET)

32.1. Main (Component View)

C2

4

C2

L2

ZD2

R58

GND

MIC_I/P

BATT

C13

R55

L1

Q5

U3AAQ9

U2

U3

U3A

C17

C30VCC

R37

C34

C110

C1

D2

81 50

31

30

80

C4

WJ1

51

U1

1001

C9

R45R66

R38

R21

D4

C28

C27

Q10

R41R75

R30R60

R44R46R28

R62R51

R29R61

R40Q2

7 1

Q6Q1

SPK

R79D1

R19 R18

R78

R4

R49R26

C60

R42

R67

R54

R24

C15

R11R88

C14

Q3 R65

R7

X2

R2

Q7

ATE

Q8

Q4 SW1

R8

R1

CON215

C31

BATT+

C1

02

C1

0R

5R

6C

7

C5

R9

2C

26

EC

3

EC

5E

C2

EC

5A

EC

2A

EC

3A

C2

9

C3

C2

2R

25

C3

3C

18

C3

2C

36 C3

5V

C1

C8

C3

8

C2

0

C2

3

C3

7C

21

R3

3 C1

6

ZD

3

C6

4

D1

0D

8

D1

1D

9

D3

C1

1

C1

03

R5

9

C2

5R3

C1

2

C1

9

R5

7R

47

C3

9 Q1

2

OF

FO

N

BU

ZZ

LE

D (

+)

LE

D (

-)

R8

0

R8

1 R6

4

R1

4

R1

3

R9

1R9

0

C6

D1

5

R3

5R

32

R4

8R

53R

31

R1

6R

12

R1

5

R5

2

R6

8

R8

9R

23

R2

0R

76

R9

C1

00

PbF

KX-TC1488LBB: HANDSET Main (Component View)

85

KX-TC1488LBB

32.2. Main (Flow Solder Side View)

KX-TC1488LBB: HANDSET Main (Flow Solder Side View)

EC1 EC4

LCD1

REDIAL

TALK

LED

7

LED

9

LED

10

LED

8

1 2 3

4 5 6

7 8 9

MUTE CH

MIC

AUTO

0 #

OFF

UP

DOWN

EDIT

PbF

86

KX-TC1488LBB

32.3. RF Module (Component View)

R517

R551

R514

R511

R513

R536

C574 C575

C595

C555

R585

C583

C538

C57

0

C50

0

R51

0

R52

4R

522

R54

3

R51

8

R54

4

R59

3

R50

9

R60

4

R14

R4

R13

R10

R8

R61

1R

606

R512

R7

R609

R531

R504

R520

R534

R533

R537

R9

R610

R578

R621R5VR1

R31

R619

R30

C530

C20

C593

C592

C545

C598

C591

L503

L506

C4

R571

C559

C556

C560

C562

C586

C567

C557C12

EC1

C535

C533

C16

C22C25 C605

CF501

C563

C23

U1

C502

C8

C31

C37

C32

R5A

R3

C39

T1

C28

P3

C38

C6

R12

R11R18

R1

R21

C21

16 10 5 1

ESC8 ESC7

R19

C7

C33

R17

C34

C13

C3

C35C36

R15

C30

C29C24

C604

L504

R503 R6

R521

R562

R561

R577

C568

Q555

Q556

Q506

Q512

R56

9

R50

1

C57

8 FL5

01

C54

6

C50

3C

582

C59

7

C54

2

C60

0

C56

5

C51

9

C56

4

C56

6

C60

2

Q50

9

L502

L505

VD

501

VD

502

C59

0

C59

9

C54

9C

534

C57

3

C56

9

C52

6

C56

1

C50

4

C54

3

C54

1

C53

7

C55

4

C53

9

C53

6

C15

R62

2

R11

1

EC

2C

14

C19

C11

C2

R16

C17

C18

F1

C9 C10

C5

C40

C55

8

R2

C50

5

ES

C10

C41

C57

2

C52

7 Q51

0

C521

C571C1 R541

VR1

Ext_outPre_out

KX-TC1488LBB: HANDSET RF Module (Component View)

Tx data DET_out SIG_out

TP808 (RXVCO)

PbF

TP510

TP809(TXVCO)

87

KX-TC1488LBB

32.4. RF Module (Flow Solder Side View)

KX-TC1488LBB: HANDSET RF Module (Flow Solder Side View)

PbF

RA16A

88

KX-TC1488LBB

MKXTC1488LBB-AK

Documents

Panasonic Kx Tc1488lbb