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Service Manual EH1 chassis

Colour Television Service Manual

Give complete "SERVICE REF. NO." for parts orderor servicing, it is shown on the rating sheet on thecabinet back of the TV set.

NoteThis TV receiver will not work properly in foreigncountries where the television transmission systemand power source differ from the design specifications.Refer to the specifications for the design specifications

ContentsSafety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Service adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-13Component locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-20Special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Waveforms & voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-27Service parts listsSchematic diagram

Chassis: EH1-AModel:

C28ER59 [Europe]C28ER59N [Europe]C28ER59NE [UK/Ireland]

For further technical information, please refer to thetraining manual EH1 chassis, ref. No. TI520013.


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-2-Service Manual EH1 chassis

SAFETY PRECAUTION

X-RADIATION PRECAUTION

The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is speciallyconstructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube mustbe the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardousX-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to thisservice manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits,take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and highvoltage adjustment to maintain the high voltage within the specified limits.

PRODUCT SAFETY NOTICE

Product safety should be considered when a component replacement is made in any area of a receiver.Components indicated by mark / /!\ in the parts list and the schematic diagram designate components in whichsafety can be of special significance. It is particularly recommended that only parts designated on the parts list inthis manual be used for component replacement designated by mark /! \ . No deviations from resistance wattageor voltage ratings may be made for replacement items designated by mark /! \ .

1: An isolation transformer should be connected in thepower line between the receiver and the AC line when

a service is performed on the primary of the convertertransformer of the set.2: Comply with all caution and safety-related notes

provided on the cabinet back, inside the cabinet, onthe chassis or the picture tube.

3: When replacing a chassis in the cabinet, always becertain that all the protective devices are installed

properly, such as, control knobs, adjustment covers orshields, barriers, isolation resistor-capacitor networksetc.Before returning any television to the customer,the service technician must be sure that it iscompletely safe to operate without danger of electricalshock.


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This is a diagram for all models and therefore differs slightly from the actual block diagram.

T u n e r

I F

s t a g e

A 2 s t e r e o

d e c o

d e r

N I C A M

d e c o

d e r

A u d

i o

P r o c e s s o r

3 D

s u r r o u n d

p r o c e s s o r

A u d

i o

o u t p u t

S p e a k e r s

A V s e

l e c t o r

V i d e o

c h r o m a

d e f l e c t

i o n

d e m o d u l a t o r

D o u

b l e

s c a n

c o n v e r t e r

V i d e o

A p e r t u r e

C o n

t r o l

&

M a t r i x

V i d e o

o u t p u t

S y s

t e m

C o n

t r o l

C P U

m e m o r y

t e l e t e x t

d e c o

d e r

H / V s y n c .

d r i v e r

V e r

t i c a l

d r i v e

&

w a v e f o r m

c o n t r o

l l e r

V e r

t i c a l

o u t p u t

H o r

i z o n

t a l d r i v e

& o u

t p u t

I 2 C b u s

D / A

H i g h - v o

l t a g e

C R

T

V o l u m e

B a s s

T r e

b l e

B a l a n c e

M u t e

A V m o d e

I 2 C B u s c o n t r o l

H - C e n

t r i n g

V - C e n

t r i n g

S I F c a r r

i e r

L , R

L , R

L , R

L , R

L , R

L , R

L , R

A V 4 ( F r o n t

)

( S c a r t )

A V 1

A V 4

A V 3

A V 2

Y / C V B S

C

Y

H / V s y n c

R - Y

B - Y

2 Y 2 R - Y

2 B - Y

V D

H D

V D

H - D r i v e

V - d r i v e

D Y

R G B I K

H . V

R G B

C o l o u r

B r i g

h t n e s s

C o n

t r a s

t

T i n t

S h a r p n e s s

CIRCUIT DESCRIPTION

Outline


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This chassis consists of the tuner, IF detector, audiosignal processor, video signal processor, AV selector,double scan converter, vertical deflection, horizontaldeflection and system control circuit that controls all ofthe circuit on this chassis.The RF(radio Frequency) signal input to the tuner fromthe aerial is converted to the IF(Intermediate Frequency)signal in the tuner stage, and then, the composite video(CVBS) signal and the SIF carrier signal are extracted atthe IF detector circuit.The SIF carrier signal is applied to the A2 stereodemodulator circuit and Nicam stereo demodulator circuitrespectively. The A2 stereo demodulator detects the SIFsignal (5.5MHz=Main channel, 5.74MHz=Sub channel)input, and sends out the A2 stereo audio signals outputto the Nicam decoder circuit, and also judges that thereceiving signal is stereo or monaural, and sends out the

result to the CPU via I 2C bus lines. The Nicam decoderdecodes the SIF signal (5.85MHz components) input andobtains the Nicam stereo audio signals output. This ICalso sends out the status (Nicam or not) to the CPU viathe I 2C bus lines. The obtained A2 stereo or Nicamstereo audio signals are selected by the CPU via the I 2Cbus and supplied to the audio processor circuit as TVaudio signal.

In the video signal processing stage, video signal outputfrom the IF detector circuit is supplied to the AV selectorcircuit as TV video signal. The AV selector circuit selects

the output video signal from the input signal of TV video,scart video and front video signal by the CPU via I 2Cbus. The selected video signal is sent to thevideo/chroma demodulator circuit. The video/chromademodulator demodulates the video signal or Y and Csignal and outputs the colour differential signal R-Y, B-Y,Y, H-sync and V-sync signal and supplies them to thedouble scan converter circuit.The double scan converted Y, R-Y and B-Y signals areapplied to the aperture control and RGB matrix circuit.The RGB original colour signal which are obtained at theRGB matrix circuit drive the video output circuit. Thisvideo output circuit also controls the automatic cut-off byfeeding back the AKB(Auto-Kine Bias) pulse on the RGBsignal during the vertical blanking period to the RGBmatrix and video control circuit.The H-sync and V-sync signals are applied to the H/Vsync driver circuit to generate the drive signals for eachoutput circuit. In the vertical signal control circuit, thevertical sawtooth signal applied to the vertical outputcircuit is waveform-shaped to compensate the rasterdistortion.

On the other hand, the audio processor circuit selects theoutput audio signal from input signals of TV audio, front

audio and scart audio by the CPU via I 2C bus. Theselected audio signals are sent to the 3D surroundprocessing circuit for adding the 3D surround effects.

These signals are again input to the audio processor IC,and are controlled in volume, bass, treble, balance andsound mute by the CPU via I 2C bus. The controlled audiosignals are supplied to the audio output circuit to drivethe loudspeakers.

Main signal flow


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Tu

Q105

X103SAW

IC101

Q112 Q1231

Q1232

IC1200 Q 1 2 0 4

Q1201Q1207

Q1202Q1208

AV1 AV2 AV3 AV4

IC801

IC202 IC204 IC201

Double ScanConverter

VideoApertureControl &matrix

Q 2 1 1

Q 2 1 2

Q 2 1 3

Q711

Q721

Q731

Q831Q832Q833

IC206

Q 8 3 6

IC711

IC721

IC731

35 8

35 8

35 8

87 21

48

1

9

11

13

33

40

3745

43

25

26

14

13

12

12

34

18192021

1117

V-sync

H-sync

YR-Y

B-Y

Y/CVBS

C

CVBS

Video

V

Y

C

T V - o u t

Video

Video

R-YB-Y

R-YB-Y

1614

1211

R,G,B,BLK

AV2-R,G,B

AV2-BLK

R,G,B

TeletextOSD R,G,B

131211

10

678

15

234

13

11

10 12

IC207

11

BLK

10 12

14

9

5

BLK

H - s y n c

V - s y n c

Y R - Y

B - Y

2Y

2R-Y

2B-Y

R

G

B

IK

BLK

RGB

2324

35343332

M o n

i t o r - o u

t

VR1201

(Front)

30

4.43MHzosc.

IF

CPU

AV Selector

VideoChromaDef.

RGBSW

Video Out

CVBS

Video signal rooting

TuX102

IC101IF

Q10765 22

Q3483Q3484

Q3483Q3484

Q3432

Q3431

5.5MHz

5.74MHz

1

15

8

7

7

8

14

13

16

7

29

8

153

5

9

24

1

2313

115

3

14

8

10

23

18

15

2 4 7 12

1

32

28

30

AV Selector Circuit

BACK BOARD

L R

L

R

L

R

FRONT AV

SCART

IC3431Audio Processor

IC35313D Surround

Processor

IC3521Equaliser

IC001Audio Output

IC3800A2 Stereo

Sound Demo.

IC3401A2 Stereo

FM DecoderIC3451

NICAM Decoder

AF1

AF2

L

R

L

R

RR

L L

R

L

L

R

L

R

SIF carrier

Main

Sub

I2C BUS

I2C BUS

20 14950

1617

From CPU

Audio signal rooting


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IC1200CXA1855S

BACK BORAD

44AV selector

IC2351CXD2018QP

IC2201AN5390FBS

IC2101AN5395FBP

IC2206LA6393M

IC2203TC74HC123AF

IC2205TC7WH74FU

IC2202TC7W04F

IC2102CXA1315P

IC675

B5V

IC2341MC74HC74AF

IC2351CXD2018QP

IC2361LA6358M

IC801QXXAV8079

IC80224LC04

IC207M74L532P

IC7213CXD2000Q

IC7203 IC7204 IC7205 IC7206

IC7207 IC7208 IC7209 IC7211IC7212 IC7215 IC7221 IC7222IC7223

IC3401TDA9840

IC3800TDA9821

IC3451SAA7283

Tuner IC101LA7577NIC350LA7210

IC2391LA6458M

IC205MC74HC74AN

IC206MC74HC04AN

IC2371LA6458M

IC2381LA6458M

IC7201TLC5733IPM

IC7214QXXAAC2138

5V8V

IC001TA8216H

5V

Q681

RC5V

IC361UPC1377C

IC2311LA6393M

IC2331CXA1315P

IC677

D5V 5V

IC672

A5V 5V

24V

IC7301

5V

IC676

B9V 9V15V

IC674

A12V 12V

P O W E R S U P P L Y

C I R C U I T

Memory

44

39

14

8

14 V-Driver 8

21 8 16 8 8 8

4 4 4H/V sync.det. I2C bus D/A

CPU

59 8 16 8 8VideoSharpness

19 16

I2C bus D/AMatrix&controller

1 2 V

- 1 2 V

SUB DEF. BOARD

VIDEO BOARD

DOUBLE SCAN CONVERTER BOARD

Logic ICs7314,2630,3551,62

8bit A/D converter

30,3242,43 D/A converter

Double scanconverter

14

14

18 14 3,26,36

A2 stereo decoder NICAM stereo decoder

9 9

IF demodulator Sync. detector

FRONT BOARD

C9V 9V

IC678

IC3531MM1369AD

IC3521M5228P

Tuning voltage

IC202TDA9143

IC203LA6393

IC201TDA8601

IC204TDA4665

IC3431TDA9860

Horiz.Drive &Output Circuit

IC673

A8V 8V

35V

IC671

A9V 9V

1 5 V

IC652

A12V 12V

P O W E R S U P P L Y

C I R C U I T

5V

IC711TDA6111Q

IC721TDA6111Q

IC731TDA6111Q

IC653

-12V -12V-16V

137V

IC501LA7846N

High Voltage

CRTHeater

65V

200V

15V

-15V

33V

T403

T402

472

V-Output

66 6

222 Video Output

CRT BOARD

424

7 8 1 6 1, 9

3D surround

Soundcontroller

RGB selectorVideo/chroma/def.

1H delay 1 2 V

- 1 2 V

To Sub Def. Board

Power supply rooting


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DISASSEMBLY

CABINET BACK DISASSEMBLY

1. Remove 10 screws(A) and 4 screews(B)2. Pull out the cabinet back.

PLACING THE CHASSIS TO SERVICEPOSITION

1. Remove 2 screws (C).2. Release the wires at hooks(D) and hooks(E).3. Remove an AC cord holder(F).4. Turn the chassis to the service position as

shown in the picture.5. Fix the chassis with a screw(C)

(C)

(A)

(B)

(C)(C) (E)

(D)

AC cordholder(F)

(B)

(A)

(A)

(A)

(A) (A)

(A)

(A)

(A)

(A)


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SERVICE ADJUSTMENTS

[After replacing the Menory IC (IC802)]

The memory IC, IC802, stores the service adjustments data for each circuit, therefore, when the memory IC isreplaced, it should be readjusted the following adjustments and confirmed initial data value, refer to the adjustmenttable on next page.

Adjustments Service ModeStereo separation adjustment Item 000, Item 001Vertical Centring Item 005Vertical Height Item 006Horizontal Centring Item 009Horizontal Width Item 010White Balance Item 034, Item 035DCS Gain Item 057Auto Setup Option setting Item 069

Enter to the Service Mode

s Press and hold the Function button on the RC handset and then press the Prog + button on the TV set.

+ To select the adjustment item, use the Prog+ or Prog- button. The selected item is indicated in red.+ To change the service data, use the Level - or Level + button.+ The data which is set in the service mode is stored into the memory IC automatically.

Exit from the Service Mode

s Turn off the TV set by using the Mains switch.

ADJUST DATA

+000 K1 +001+001 K2 -006+003 STID +000

ADJUST DATA

+000 K1 +001+001 K2 -006+003 STID +000

Item service data

Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and theadjustments are carried out by using the RC handset.



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Adjust. items Initial value Status Description+000 K1 +000 ADJSTBL Signal level adjustment for A2 stereo, 500mVrms at 54% dev. on pin 1 of SCART 1+001 K2 -006 ADJSTBL Separation adjustment for A2 stereo, minimise R signal on pin 3 of SCART 1+002 STID +000 Fixed Judgement algolizum for A2 stereo, 0: FAST 1:NORMAL 2:FAST -> NORMAL+003 ATT +004 Fixed Sound level adjustment between A2 stereo and NICAM stereo decoded output

+004 VFreq +130 Fixed Not used+005 VCent +086 ADJSTBL Vertical centre adjustment for 50Hz+006 VSize +028 ADJSTBL Vertical size adjustment for 50Hz+007 SCore +010 RECOMD Vertical linearity adjustment (centre, top/bottom part), common data of 50/60Hz+008 VLner +009 RECOMD Vertical linearity adjustment (top and bottom part), common data of 50/60Hz+009 HCent +175 ADJSTBL Horizontal centre adjustment for 50Hz+010 HSize +032 ADJSTBL Horizontal width adjustment for 50Hz+011 PinAmp +023 RECOMD Horizontal pincushion adjustment for 50Hz+012 Tilt +022 RECOMD Trapezoid distortion correction adjustment for 50Hz+013 UCoPin +010 RECOMD Upper corner pincushion adjustment, common data of 50/60Hz+014 LCoPin +010 RECOMD Lower corner pincushion adjustment, common data of 50/60Hz+015 VBow +011 RECOMD Vertical line correction adjustment, common data of 50/60Hz+016 VAngle +007 RECOMD Parallelogram distortion correction adjustment for 50Hz+017 HVCmpV +007 Fixed Vertical size correction due to beam current, common data of 50Hz/60Hz

+018 HVCmpH +007 Fixed Horizontal width correction due to beam current, common data of 50/60Hz+019 VFreq60 +000 Fixed Setting of vertical osc. frequency for 60Hz (Not used)+020 VCent60 -002 Fixed Vertical centre adjustment for 60Hz (difference to ITEM 5)+021 VC16950 +000 Fixed Vertical centre adjustment on 16:9 mode for 50Hz (difference to ITEM 5)+00+022 VC16960 +000 Fixed Vertical centre adjustment on 16:9 mode for 60Hz (difference to ITEM 5)+023 VSize60 +000 Fixed Vertical size adjustment for 60Hz (difference to ITEM 6)+024 VS16950 +000 Fixed Vertical size adjustment on 16:9 mode for 50Hz (difference to ITEM 6)+025 HCent60 +003 Fixed Horizontal centre adjustment for 60Hz (difference to ITEM 9)+026 HCentTX -010 Fixed Horizontal centre adjustment on teletext mode (difference to ITEM 9)+027 HSize60 +002 Fixed Horizontal width adjustment for 60Hz (difference to ITEM 10)+028 PinAmp60 +001 Fixed Horizontal pincushion adjustment for 60Hz (difference to ITEM11)+029 Tilt60 +003 Fixed Trapezoid distortion correction for 60Hz (difference to ITEM12)+030 Colour +023 Fixed Sub colour setting+031 TintAN +069 Fixed Tint setting for AN5390+032 Cont +027 Fixed Sub contrast setting+033 Bright +022 Fixed Sub brightness setting+034 DriveR +152 ADJSTBL R-drive adjustment of white-balance+035 DriveB +160 ADJSTBL B-drive adjustment of white-balance+036 CutofG +050 RECOMD G-cut off adjustment of white-balance+037 CutofR +063 RECOMD R-cut off adjustment of white-balance+038 CutofB +042 RECOMD B-cut off adjustment of white-balance+039 BYGinPA +035 Fixed B-Y gain setting (PAL)+040 RYAnglPA +000 Fixed R-Y angle setting (PAL)+041 MatrxPA +003 Fixed G-Y matrix ratio setting (PAL)+042 BYGinNT +037 Fixed B-Y gain setting (NTSC)+043 RYAnglNT +000 Fixed R-Y angle setting (NTSC)+044 MatrxNT +002 Fixed G-Y matrix ratio setting (NTSC)+045 BYGinSE +037 Fixed B-Y gain setting (SECAM)+046 RYAnglSE +000 Fixed R-Y angle setting (SECAM)+047 MatrxSE +002 Fixed G-Y matrix ratio setting (SECAM)+048 TintSW +009 Fixed Tint setting fro AN5390+049 ABLACL* +000 Fixed ABL/ACL defeat switch and other setting+050 Black +104 Fixed Setting of operational point and gain for black expansion function+051 Gamma +240 Fixed Setting of gamma compensation (o: minimum, 240: maximum)+052 White +032 Fixed Setting of slice level for white peak and adder value to B signal+053 ABL +095 Fixed Setting of ABL operational point and gain+054 ACL +207 Fixed Setting of ACL operational point and gain+055 VMGain +012 Fixed Gain setting of VM+056 SW12 +000 Fixed Y/C delay value setting for AN5390+057 DCSGain +220 ADJSTBL Gain setting of DSC+058 Sharp +004 Fixed Sub sharpness adjustment

+059 DGain +120 Fixed Sharpness setting of small signal part+060 DCore +125 Fixed Coring setting of Dgain+061 DCoreSNR +000 Fixed Change Dcore value according to TDA9143 noise detection (0: No correction)+062 Sepetn +100 Fixed Setting of Dgain and aperture control value

Adjustment Items and data Table


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+063 Xtal +002 Fixed Xtal setting, 0:3.58+3.58, 1:3.58, 2:4.43, 3:4.43+3.58+064 System +224 Fixed Sub address setting 01 of TDA9134+065 TintTDA +016 Fixed Tint setting of TDA9143+066 YDelyPA +010 Fixed Y/C phase setting for PAL (sub address setting 18 of TDA9143)+067 YDelyNT +010 Fixed Y/C phase setting for NTSC (sub address setting 18 of TDA9143)+068 YDelySE +010 Fixed Y/C phase setting for SECAM (sub address setting 18 of TDA9143)+069 Country +001 ADJSTBL 0: auto search 1: ATS

+070 WideOpt +001 Fixed 0: 16:9 mode off 1: 16:9 mode on+071 TxBrit +040 Fixed Black level setting of teletext mode+072 TxCont +062 Fixed Contrast setting of teletext

Notes:+ The initial value that the CPU writes down the CPU ROM data to the memory when replaced the memory IC. TV

set does not operate correctly with this initial value.+ The items which are shown with fixed in the status column in the table above are preset by factory as standard.

So do not change value otherwise the set may not operate properly.+ The items which are shown with RECOMD are normally not requied for re-adjustment but it may change the value

to implove the performance.+ The items which are shown with ADJSTBL should be re-adjusted following steps.

STEREO SEPARATION ADJUSTMENT1. Enter to the service mode.2. Select item 000 and set data to +000, select item 001

and set data to -006.

VERTICAL CENTRING ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 5 and adjust the vertical centre.

VERTICAL HEIGHT ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 6 and adjust the vertical height.

HORIZONTAL CENTRING ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 9 and adjust the horizontal centre.

HORIZONTAL WIDTH ADJUSTMENT1. Receive circular pattern.2. Enter to the service mode.3. Select Item 10 and adjust the horizontal width.

WHITE BALANCE ADJUSTMENT1. Receive white pattern.2. Enter to the service mode.3. Adjust white balance using the following items,

Item 034 R drive adjustmentItem 035 B drive adjustment

DCS GAIN ADJUSTMENT1. Enter to the service mode.2. Select item 059 and set data to 100.

AUTO SETUP OPTION SETTING1. Enter to the service mode.2. Select item 057 and set data as follows;

Value +000 : Auto search mode for UK and IrelandValue +001 : ATS mode for W. Europe countries.

SERVICE ADJUSTMENTS-1

After replacing the memory IC, IC802, folllowing service adjustments must be carried out.


12/28


VCO ADJUSTMENT1. Receive the circular pattern.2. Adjust the picture to obtain the best picture by using

T103.

B1 POWER SUPPLY ADJUSTMENT1. Set VR641 to be mechanical centre before pressing

the main switch.2. Receive the circular pattern.3. Set brightness and contrast controls to normal.4. Connect digital V-meter to TP453 on the sub/def.

board.5. Adjust voltage to be 1370.5V DC by using VR641 on

the sub/def. board.

AFT ADJUSTMENT1. Receive the clearest station.2. Adjust AFT to obtain the best picture by using T102.

AGC ADJUSTMENTNOTE: Do not attempt this adjustment with weak signal.1. Receive the clearest station.2. Set AGC VR(VR101) in direction which causes snow

noise to appear, then in the opposite direction untilsnow noise just disappears.

FM DETECTOR ADJUSTMENT(UK/Ireland only)1. Receive the monaural station of system I.2. Connect voltmetre between TPC and TPE.3. Adjust the voltage to be 6.00.2V DC by using T101.

PILOT ADJUSTMENT(Europe only)1. Receive the A2 stereo signal

Carrier :5.5MHz + 5.74MHz

Deviation :27kHz2. Connect oscilloscope between TP34A(pin 5 of IC3401)

and TP34E.3. Adjust the amplitude to be maximum by using T3401.

VIDEO AMPLITUDE ADJUSTMENT(Europe only)1. Receive the PAL colour bar pattern.2. Connect oscilloscope between JT1201(+) and

JT1201E(-) on the back board.3. Adjust the video amplitude to be 1.0Vp-p0.05V by

using VR1201 on the back board.

DOUBLE SCAN ADJUSTMENTReceive the PAL colour bar pattern. Adjustment points

are on the double scan borad.

[PLL ADJUSTMENT]1. Connect oscilloscope between C7226-(TPOSC)(+)

and GND(-).2. Adjust voltage to be 2.5V DC by using T7201.

[CLAMP ADJUSTMENT]1. Connect voltmetre between pin 52 of IC7201(+) and

pin 48 of IC7201(-).2. Adjust voltage to be 2.0V DC by using VR7201.

[OUTPUT LEVEL ADJUSTMENT-Y]1. Connect oscilloscope between pin 6 of K73C(+) and

GND(-).2. Adjust the Y signal amplitude to be 0.7Vp-p by using

VR7351.

0.7Vp-p

2.5V DC

DC=0

1.0Vp-p

100% white level

SERVICE ADJUSTMENTS-2

Please refer to the Component Locations for the adjustments and test points.


13/28


[OUTPUT LEVEL ADJUSTMENT-R-Y]1. Connect oscilloscope between pin 10 of K73C(+) and

GND(-).2. Adjust the R-Y signal amplitude to be 0.7Vp-p by using

VR7352.

[OUTPUT LEVEL ADJUSTMENT-B-Y]1. Connect oscilloscope between pin 8 of K73C(+) and

GND(-).2. Adjust the B-Y signal amplitude to be 0.7Vp-p by using

VR7353.

SCREEN ADJUSTMENT1. Receive the PAL colour bar pattern.2. Connect oscilloscope between JTP47G(+) and

JTP47E(-) on the CRT unit.3. Adjust colour control to minimum, brightness to centre

and contrast to minimum.4. Adjust the black level to be 165V DC5V by using

SCREEN VR on the FBT.

HIGH VOLTAGE CONFIRMATION1. Receive the white pattern.2. Set brightness and contrast controls to maximum.3. Connect digital V-meter between TP451 and

TP452, and high voltage meter to CRT anode.4. Confirm high voltage to be 28.5 1 KV at beam

current 1.8, and less than 32.5 KV at 0 beam current.

FOCUS ADJUSTMENTBy using FOCUS VR, adjust focus control for welldefined scanning lines.

165V DC

DC=0

Black level

0.7Vp-p

0.7Vp-p


14/28


MAIN BOARD (Component side)

A 1 0 1

A

I C 1 0 1

IC

I C 2 0 4

IC

I C 2 0 2

IC

I C 3 4 5 1

IC

I C 3 4 0 1

IC

I C 3 8 0 0

IC

I C 2 0 1

IC

S C A N

C ON V E R T E R

U N I T

S

C

N

U

T

I C 2 0 5

IC

K 2 P O

K

PO

K 2 V I

K

V

K 2 P L

K

P

K 2 K K

K

K 2 L K

K2W2WK2Y2Y

I C 3 4 3 1

ICI C 3 5 3 1

ICI C 3 5 0 0

IC

I C 8 0 1

IC

IC3521C3521

I C 6 7 4

I C 6 7 8

T P A

T P E

A 1 0 1

T P D

V R 1 0 1

A G C T 1 0 1

T 1

0 2 I C 1 0 1

T 1 0 3

I C 2

0 4

I C 2 0 2

I C 3 4 5 1

I C 3 4 0 1

I C 3 8 0 0

T P

3 4 A

T 3 4 0 1

I C 2 0 1

I C 2 0 7

I C 6 7 3

S C A N

C ON V E R T E R

U N I T

I C 2 0 5

I C 2 0 6 V I D

E O U N I T

TP2CTP2BTP2A

K 2 P

O

K 2 V I

K 2 P L

K 2 K

K 2 L

K2WK2Y

I C 6 7 7

I C 3 4 3 1

I C 3 5 3 1

I C 3 5 0 0

I C 6 7 1

I C 3 5 0

I C 8 0 2 I C

8 0 1

IC3521

I C 0 0 1

I C 6 7 5

I C 6 7 6

T P

C

T P

3 4 E

I C 2

0 3

A F T

P I L

OT

V C O

A G C

F M

COMPONENTLOCATIONS


15/28


MAIN BOARD (Circuit side)

A 1 0 1

Q1 0 3 Q1 0 2

Q1 0 1

Q1 0 4

Q1 1 4

Q1 1 5

Q1 1 2

Q1 1 1

Q1 3 1

Q1 0 7

I C 1 0 1

Q2 1 1 Q2 1 2 Q

2 1 3

I C 2 0 2

I C 2 0 4

Q2 1 4

I C 2 0 6

I C 3 4 5 1

Q 3 4 8 3

Q 3 4 8 1

Q 3 4 1 2

Q 3 4 1 1

Q 3 4 8 2

I C 0 0 1

I C 3 5 2 1

Q 3 4 3 1

I C 3 4 3 1

Q 3 4 3 2

I C 3 5 3 1

I C 3 5 0 0

Q 8 7 3

Q 8 5 1 I C

8 0 1 Q 8 0 4

Q 8 0 3

Q 8 0 2

I C 3 8 0 0

I C 3 4 0 1

I C 2 0 1

I C 2 0 7

I C 2 0 5

Q 8 3 5

Q 8 3 6

Q 8 3 1

Q 8 3 2

Q 8 3 3

Q 3 4 8 4


16/28


I C 6 5 2

V R

6 4 1

Q 6 4 1

Q 6 6 1

Q 6 6 4

D 6 1 5

Q 6 1 1

Q 6 1 2

Q 6 1 3

T 6 1 1

C onv er t er

t r an s .

T 4 0 3

C h ok

e t r an s .

T 4 0 2

F l y b a c k

t r an s .

I C 6 5 3

Q4 2 2

Q4 7 4

I C 5 0 1

V er t i c al

o u t p u t

Q 5 7 2 Q

5 5 5 Q 5 5 4

Q 5 5 6

Q4 6 1

Q4 7 3

Q4 7 2

Q4 7 1

Q4 0 1

H or i z on t al o u t p u t

Q4 3 1

I C 4 3 1

Q4 0 2

LIVE SIDE

+B V

OL T

T P 4 E

T P 4 5 3

T P 4 5 2

T P 4 5 1

S C R E E

N

POWER DEF BOARD (Component side)


17/28


K23N K23M

J23HW

H-SIZESW

IC2331

IC361

VR391H-OSC

Q2314

Q2312

IC2201

IC2101

IC2203IC2102

IC2206

IC2204

IC2202

IC2205

Q2207

Q2206

Q2204

Q2205

Q1751

Q2202 Q1752

Q1753

Q1755

Q2105Q2106Q2110

Q2109

Q2108 Q2107

Q2161

Q2102 Q2101

Q2103

Q2104

Q2201

K20PL K20VI K20PO

SUB DEF BOARD (Component side)

VIDEO BOARD (Component side)

IC2351

IC2341

IC2311

IC2371 IC2391

IC2381

IC2361

Q2341Q364

Q2313

Q361

Q2311

SUB DEF BOARD (Circuit side)


18/28


IC7203

IC7204

IC7201

VR7201REF TOP

Q7304Q7338

Q7308

Q7301

Q7307

Q7306

Q7359 Q7355 Q7351

IC7223

IC7206

IC7222

IC2101

Q7360

Q7362 Q7361

VR7353

Q7356

Q7358 Q7357

VR7352

Q7352

Q7354 Q7353

VR7351

IC7215

IC7212

IC7207

IC7214

IC7301

K73AK73CK73B

T7201

CLAMP

PLL

R-Y

B-Y

Y

DOUBLE SCAN BOARD (Component side)

IC7211

IC7208

IC7205 IC7209 Q7201 IC7202

DOUBLE SCAN BOARD (Circuit side)


19/28


K1001

K1002

K1003

VR1201Video Level

Q1231

Q1232

Q1002Q1205

Q1206Q1203

Q1204Q1202

Q1208

Q1201

Q1207

IC1201

Q1001

K10Y K10W

JT1201

J T 1 2 0 1 E

VIDEO AMP

Q702Q703

Q721

Q701

Q731

Q711

IC711B-OUT

IC721G-OUT

IC731R-OUT

K701

JTP47E

JTP47G

BACK BOARD (Component side)

CRT BOARD (Component side)


20/28


T 6 0 2

T

T 6 8 1

T

S W

6 0 1

M ai n s S Wi t c h

F 6 0 1

F u s e A 1 9 0 1

S W1 9 0 1

S W1 9 0 2

S W1 9 0 3

S W1 9 0 4

P r o g +P r o g-

V ol +

V ol -

F / MP T

S Y

S

T 6 0 2

T 6 8 1

S W1 9 0

5 S W1 9 0 6

S W1 9 0 7

Q 6 8 2

Q 6 8 8

Q1 1 1 1

Q1 1 2 1

Q1 1 3 1

K 1 1 0 1

K 0 0 1

FRONT BOARD (Component side)


21/28


This TV set allows you to set up the following specialfunctions.

s Maximum volume setting and prohibition of presetting

ITEM-1Sets the current volume as the maximum volume level and

prohibition of presetting.

SET 0 NOSET 1 YES

s Start up programme position

ITEM-2Presets the programme position when the set is switched on.

SET 0 Last programme position startSET 1 Programme position "1" startSET 2 Programme position "2" startSET 3 Programme position "3" startSET 4 Programme position "4" startSET 5 Programme position "5" startSET 6 Programme position "6" startSET 7 Programme position "7" startSET 8 Programme position "8" startSET 9 "AV1" start

SETTING PROCEDURE

1 Press and hold the button on the Remote controlhandset and then press the Pv button on the TV set .

2To select the "ITEM" number, press the button on

the remote control handset .

3 To select the "SET" number,press the orbutton repeatedly.4 To return to the normal TV mode, press thebutton .

i The setting conditions of all items can be confirmed.i Special functions are not cancelled if the TV set is switched

off or the mains disconnected.i

This mode is not available whilst in the AV mode.

F

ITEM-1 SET->0

SPECIALFUNCTIONS


22/28


WAVEFORMS & VOLTAGES

On the CRT Boa rd

TP47B

50V/div. 10 s/div.

DC=0V

TP47R

50V/div. 10 s/div.

DC=0V

TP47G

50V/div. 10 s/div.

DC=0V

Q711E 3.6VC 0VB 3.0V

Q721E 3.6VC 0VB 3.0V

Q731E 3.7VC 0VB 3.1V

IC7111 3.3V 2 12.2V 3 3.3V 4 0V 5 6.4V 6 210V 7 138V 8 138V 9 137V

IC7211 3.3V 2 12.1V 3 3.3V 4 0V 5 6.4V 6 210V 7 141V 8 142V 9 140V

IC731

1 3.3V 2 12.1V 3 3.3V 4 0V 5 6.5V 6 210V 7 135V 8 136V 9 134V

On the Main Board(1)

IC0011 1.6V 2 0V 3 0V 4 0V 5 1.5V 6 9.4V 7 13.2V 8 5.0V 9 27.7V

10 0V 11 5.0V 12 12.7V

IC1011 11.1V 2 5.7V 3 6.8V 4 4.6V 5 4.7V 6 4.6V 7 0V 8 3.7V 9 12.1V

10 9.0V 11 4.1V 12 4.2V 13 6.8V 14 7.0V 15 11.2V 16 11.3V 17 4.6V 18 5.3V19 4.7V 20 5.3V 21 5.3V 22 10.1V 23 5.1V 24 2.0V

IC2011 8.1V 2 2.3V 3 2.3V 4 2.4V 5 4.1V 6 3.8V 7 2.3V 8 5.1V 9 0V

10 2.3V 11 2.2V 12 2.2V 13 0.7V 14 1.0V 15 0V 16 0.4V

On the Front Boa rd

Q681E 5.1VC 15.3VB 5.8V

Q682E 5.0VC 5.1VB 5.6V

Q1111E 4.5VC 12.2VB 5.1V

Q1121E 4.5VC 12.2VB 5.1V

Q1131E 4.5VC 12.2VB 5.1V

K7D-6

1V/div. 10 s/div.

DC=0V

K7D-4

50V/div. 10 s/div.

DC=0V

K7D-5

1V/div. 10 s/div.

DC=0V

TPIK

2V/div. 10 s/div.


23/28


On the Main Board(2)

IC2021 0V 2 2.1V 3 2.4V 4 2.4V 5 4.1V 6 3.8V 7 8.0V 8 5.1V 9 0V

10 1.8V 11 0V 12 3.3V 13 2.6V 14 2.5V 15 0V 16 2.5V 17 0.3V 18 0.7V19 5.1V 20 5.0V 21 5.0V 22 3.3V 23 0.1V 24 4.0V 25 0V 26 3.8V 27 0V28 3.5V 29 5.0V 30 2.5V 31 2.7V 32 0V

IC2031 0V 2 0V 3 0V 4 0V 5 1.1V 6 3.2V 7 0.4V 8 8.0V

IC2041 5.1V 2 0V 3 0V 4 0V 5 7.1V 6 0V 7 4.2V 8 0V 9 5.2V

10 0V 11 2.9V 12 2.9V 13 0V 14 1.4V 15 0V 16 1.3VIC205

1 5.1V 2 0V 3 0.2V 4 5.0V 5 0V 6 5.0V 7 0V 8 5.1V 9 0V10 5.0V 11 0.2V 12 0V 13 5.1V 14 5.1V

IC2061 4.8V 2 0.2V 3 0.2V 4 4.8V 5 4.8V 6 0.2V 7 0V 8 5.0V 9 0V

10 4.8V 11 0.3V 12 5.0V 13 0V 14 5.1V

IC2071 0V 2 0V 3 0.1V 4 0V 5 4.8V 6 0V 7 0V 8 0.9 9 1.2V

10 0V 11 0.9V 12 0V 13 1.2V 14 5.1V

IC3501 9.9V 2 9.4V 3 9.4V 4 5.7V 5 0V 6 9.6V 7 0.3V 8 10.8V 9 12.1V

10 0V

IC671 IC672 IC6731 14.9V 2 0V 3 9.0V 1 8.1V 2 0V 3 5.1V 1 11.1V 2 0V 3 8.0V

IC674 IC675 IC6761 15.2V 2 0V 3 12.2V 1 9.1V 2 0V 3 5.1V 1 12.3V 2 0V 3 9.1V

IC6781 12.1V 2 0V 3 9.2V

IC8011 0.6V 2 0V 3 0V 4 0.6V 5 5.0V 6 5.0V 7 5.1V 8 0.1V 9 2.5V

10 0.6V 11 3.7V 12 3.1V 13 0V 14 0.1V 15 5.2V 16 5.1V 17 0.1V 18 0V19 5.1V 20 3.3V 21 0.1V 22 0V 23 2.1V 24 0.1V 25 2.0V 26 2.5V 27 0V28 0V 29 5.0V 30 0V 31 2.1V 32 0V 33 0V 34 0V 35 0V 36 0.3V37 0.1V 38 5.0V 39 5.0V 40 0.1V 41 2.4V 42 2.7V 43 0V 44 5.1V 45 4.6V46 0V 47 5.0V 48 5.0V 49 4.1V 50 3.6V 51 5.1V 52 5.1V

IC8021 0V 2 0V 3 0V 4 0V 5 5.1V 6 5.1V 7 0V 8 5.1V

IC34011 3.8V 2 3.4V 3 2.7V 4 2.7V 5 2.6V 6 2.6V 7 2.5V 8 2.5V 9 2.6V10 2.5V 11 2.5V 12 2.5V 13 2.5V 14 2.5V 15 2.5V 16 0V 17 2.5V 18 5.1V19 3.4V 20 4.0V

IC34311 4.1V 2 0.1V 3 4.0V 4 8.1V 5 4.0V 6 8.0V 7 4.0V 8 0V 9 4.0V

10 4.0V 11 4.0V 12 4.0V 13 4.0V 14 4.0V 15 4.0V 16 4.0V 17 3.7V 18 4.0V19 4.0V 20 4.0V 21 4.0V 22 4.0V 23 4.0V 24 4.0V 25 0V 26 4.0V 27 4.0V28 4.0V 29 4.0V 30 4.0V 31 0.1V 32 4.0V

IC34511 0V 2 2.4V 3 5.0V 4 0V 5 2.5V 6 2.5V 7 2.6V 8 2.5V 9 0V

10 0V 11 2.5V 12 0V 13 0V 14 0V 15 2.5V 16 2.5V 17 2.5V 18 4.8V19 0V 20 2.5V 21 2.6V 22 2.5V 23 2.5V 24 0V 25 2.6V 26 5.0V 27 2.5V

28 2.5V 29 2.5V 30 2.6V 31 2.5V 32 2.3V 33 2.5V 34 2.5V 35 2.5V 36 5.1V37 0V 38 5.1V 39 4.3V 40 3.6V 41 2.6V 42 0V 43 0.9V 44 0V 45 2.6V46 5.0V 47 4.7V 48 0.9 V 49 4.0V 50 4.0V 51 5.0V 52 0V


24/28


25/28


On the Powe r/ Def. Boa rd

IC652 IC6531 15.7V 2 0V 3 12.2V 1 0V 2 -15.6V 3 -12.0V

IC5011 0V 2 -14.3V 3 0V 4 13.1V 5 0V 6 0V 7 0.8V 8 -12.2V 9 0V

10 0V

Q401E 0VC 32.0VB 0.5V

Q402E 0VC --B -1.6V

Q422E 2.1VC 12.3VB 2.8V

Q471E 0VC 11.8VB 0.6V

Q472E 12.5VC 0VB 0.7V

Q474E 0VC 0.1VB 0.7V

Q554E 0VC 51.7VB 0V

Q421E 135VC 57.4VB 134.5V

Q555E 53.8VC 13.2VB 0V

Q556E 54.7VC 13.2V

B 53.8V

Q572E 0VC 0V

B 0.6V

Q612E -0.2VC 0V

B -0.2V

Q613E 0VC --

B 0V

Q661E 0VC 5.3V

B 0V

Q611E 7.9VC -0.4V

B 7.5V

Q664E 0VC 37.8V

B 0.1V

Q641E 6.4VC 37.8V

B 7.0V

Q612-C

1V/div. 10 s/div.

Q613-C

200V/div. 10 s/div.

Q402-C

10V/div. 10 s/div.

Q401-C

250V/div. 10 s/div.

Q472-E

5V/div. 2ms/div.

IC501-pin3

10V/div. 2ms/div.

Q611-C

1V/div. 10 s/div.

On the Sub/ Def. Boa rd(1)

IC3611 8.0V 2 2.4V 3 3.8V 4 7.0V 5 7.0V 6 - 7 - 8 - 9 0V10 0.8V 11 13.1V 12 0.2V 13 0.2V 14 0V 15 0V 16 0V 17 4.0V 18 6.8V19 4.1V 20 0V 21 12.0V 22 3.7V

IC23311 0.7V 2 0V 3 0.3V 4 0.4V 5 4.0V 6 3.3V 7 0.4V 8 0V 9 0V

10 0V 11 9.1V 12 9.1V 13 9.1V 14 4.0V 15 4.1V 16 9.1V

Q361E 0VC 0.5VB 0.7V

Q364E 0.2VC 12.0VB 0.2V

Q2312E 0VC 1.6VB 0.2V

Q2313E 0VC 6.3VB 0V

Q2314E 0VC 0.9VB 0.4V

Q2311E 0VC 5.1VB -1.8V

Q2341E 0VC 4.5VB 0.1V


26/28


On the Sub/ Def. Board(2)

IC361-pin1

2V/div. 10 s/div.

DC=0V

IC361-pin3

2V/div. 10 s/div.

DC=0V

IC361-pin10

2V/div. 10 s/div.

DC=0V

IC361-pin12

5V/div. 2ms/div.

DC=0V

IC361-pin18

2V/d iv. 2ms /d iv.

DC=0V

IC361-pin19

2V/d iv. 2ms /d iv.

DC=0V

IC2311-pin7

5V/div. 5 s/div.

DC=0V

IIC2361-pin7

0.5V/div. 2ms/div.

DC=0V

IC2371-pin1

5V/div. 2ms/div.

DC=0V

IC2371-pin7

1V/div. 2ms /d iv.

DC=0V

IC2381-pin1

5V/d iv. 2ms /d iv.

DC=0V

IC2381-pin7

0.5V/div. 2ms/div.

DC=0V

IC2391-pin1

2V/d iv. 2ms/d iv.

DC=0V

IC2391-pin7

2V/div. 10 s/div.

DC=0V

On the Video Board

IC21021 0V 2 0.1V 3 3.7V 4 0V 5 4.5V 6 3.3V 7 7.6V 8 0V 9 0.1V

10 0.1V 11 0V 12 9.1V 13 9.1V 14 3.8V 15 4.2V 16 9.1V

IC22021 0.4V 2 0.4V 3 0.4V 4 0V 5 4.7V 6 4.7V 7 4.7V 8 5.1V

IC22031 0V 2 5.1V 3 5.1V 4 5.1V 5 0.2V 6 0V 7 5.0V 8 0V 9 0.1V

10 0V 11 5.1V 12 5.0V 13 0.1V 14 0V 15 5.0V 16 5.0V

IC22061 1.2V 2 0V 3 0V 4 0V 5 0.1V 6 2.2V 7 0.1V 8 0V

Q2101E 5.1VC 9.1VB 5.7V

Q2102E 5.1VC 9.1VB 5.7V

Q2104E 5.0VC 9.1VB 5.6V

Q2105E 4.1VC 9.1VB 4.8V

Q2106E 4.1VC 9.1VB 4.9V

Q2107E 3.6VC 0VB 3.1V

Q2108E 2.9VC 9.1VB 3.5V

Q2103E 5.0VC 9.1VB 5.6V

Q2109E 3.6VC 9.1VB 4.3V

Q2110E 3.8VC 7.4VB 4.4V

Q2111E 6.9VC 9.1VB 7.5V

Q2201E 4.3VC 9.1VB 5.1V

Q2203E 0VC 0.6VB 0.2V

Q2112E 4.3VC 9.1VB 4.8V

Q2204E 9.1VC 0VB 5.6V


27/28


On the Back Board

IC12011 4.5V 2 4.5V 3 4.5V 4 4.5V 5 4.5V 6 0V 7 4.5V 8 4.5V 9 4.5V

10 4.5V 11 4.5V 12 0V 13 4.5V 14 4.5V 15 4.5V 16 4.5V 17 4.5V 18 0V19 4.1V 20 3.7V 21 0V 22 4.5V 23 4.5V 24 4.5V 25 4.5V 26 4.5V 27 4.5V28 4.5V 29 4.5V 30 4.5V 31 4.5V 32 4.5V 33 4.5V 34 0V 35 4.5V 36 0V37 4.5V 38 4.5V 39 4.5V 40 4.5V 41 4.5V 42 4.5V 43 4.5V 44 9.0V 45 4.5V46 4.5V 47 4.5V 48 4.5V

Q1001E 0.6VC 0VB 0V

Q1002E 3.9VC 9.1VB 4.5V

Q1201E 3.8VC 9.0VB 4.5V

Q1202E 3.8VC 0VB 4.5V

Q1203E 5.1VC 9.0VB 3.0V

Q1204E 4.5VC 9.0VB 5.1V

Q1205E 6.1VC 9.0VB 5.1V

Q1003E 6.6VC 9.0VB 7.4V

Q1206E 7.5VC 9.0VB 5.6V

Q1207E 2.6V

C 0VB 1.9V

Q1208E 2.6V

C 0VB 1.9V

Q1232E 4.0V

C 9.0VB 4.6V

Q1231E 4.0V

C 9.0VB 4.7V

IC1201pin47

0.2/div. 20 s/div.

IC1201-pin43

0.5/div. 20 s/div.

IC1201-pin40

0.5/div. 20 s/div.


28/28