Page 1

SERVICE MANUALPMX-1100

Stereo Preamp Mixer

Gemini Sound Products Corp.120 Clover Place P.O. Box 6928

Edison, NJ 08818-6928732-738-9003 (Phone) • 732-738-9006 (Fax)

CONTENT’S:Connections & Operations:.......................................................Page 2-4

Specifications:..............................................................................Page 4

Parts Lists:....................................................................................Page 4

PCBs:.............................................................................................Page 5

Schematics....................................................................................Page 6

Page 2

1

7 9 11 13

8 10 12 14

2

3

4

5 6

18 18

24 22

23

20

21

15

31 32

34 3835

36

42

39 45

37

434037 41

33

17 19

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6. Headphones can be plugged into the front panel mountedHEADPHONE (4) jack.

Operation

1. POWER ON: Once you have made all the equipment connections toyour mixer, press the POWER SWITCH (1). The power will turn onand the POWER LEDS (17) will glow.

2. CHANNEL 1: Switch # (7) allows you to select the PHONO 1/LINE 2(41) or the LINE 1 (43) input. The CHANNEL SLIDE (8) controls theinput level of this channel.

3. CHANNEL 2: Switch # (9) allows you to select the PHONO 2/LINE 4(38) or the LINE 3 (40) input. The CHANNEL SLIDE (10) controls theinput level of this channel.

4. CHANNEL 3: Switch # (11) allows you to select the PHONO 3/LINE 6(35) or the LINE 5 (37) input. The CHANNEL SLIDE (12) controls theinput level of this channel.

5. CHANNEL 4: Switch # (13) allows you to select the LINE 7 (34) orthe MIC 2 (33) input. The CHANNEL SLIDE (14) controls the inputlevel of this channel.

6. CROSSFADER SECTION: The CROSSFADER (2) allows the mixing ofone source from CHANNEL 2 into another source from CHANNEL 3.The CROSSFADER (2) in your unit is removable and if the needarises can be easily replaced. Crossfader units are available inthree varieties. Part # RF-45 (which is identical to the crossfadersupplied with the mixer) has a 45 mm travel from side to side. Part #RF-30 is available with a 30 mm travel distance. Also available is thePSF-45 with a special curve designed for scratch mixing. Justpurchase one of these crossfader units from your Gemini dealerand follow these instructions:

IntroductionCongratulations on purchasing the Gemini PMX-1100 mixer. This state-of-the-art mixer is backed by a three year warranty, excluding crossfaderand channel slides. Prior to use, we suggest that you carefully read all theinstructions.

Features• 4 Stereo Channels

• State of the Art Cue Section

• 3 Phono/Line Convertible, 4 Line, and 2 Mic Inputs

• Talkover

• Master and Record outputs

• Master Treble and Bass Controls

Cautions

1. All operating instructions should be read before using this equipment.

2. To reduce the risk of electrical shock, do not open the unit. There areNO USER REPLACEABLE PARTS INSIDE. Please refer servicing to aqualified service technician.

In the U.S.A., if you have any problems with this unit,call 1-732-738-9003 for customer service. Do not returnequipment to your dealer.

3. Do not expose this unit to direct sunlight or to a heat source such as aradiator or stove.

4. This unit should be cleaned only with a damp cloth. Avoid solvents orother cleaning detergents.

5. When moving this equipment, it should be placed in its original cartonand packaging. This will reduce the risk of damage during transit.

6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

7. DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANYCONTROLS OR SWITCHES.

Connections1. Plug in the 15V AC Adapter (37).

2. Make sure that the POWER (1) switch is in the off position. ThePOWER LEDS (17) will be off.

3. The PMX-1100 is supplied with 2 sets of output jacks. The MAINOUTPUT (31) jacks are unbalanced and used to connect to your mainamplifier. The REC OUTPUT (32) jacks can be used to connect themixer to the record input of your recorder enabling you to record yourmix.

4. The MIC 1 (3) input (found on the front panel) accepts an XLRconnector, and accepts balanced & unbalanced microphones. TheMIC 2 (33) accepts a 1/4” connector and balanced & unbalancedmicrophones.

5. On the rear panel are 3 stereo PHONO/LINE (35, 38, 41) inputs and 4stereo LINE (34, 37, 40, 41) inputs. The PHONO/LINE SWITCH (36)enables you to set the (35) input to Phono or Line. The PHONO/LINESWITCH (39) enables you to set the (38) input to Phono or Line. ThePHONO/LINE SWITCH (42) enables you to set the (41) input to Phonoor Line. The phono inputs will accept only turntables with a magneticcartridge. A GROUND SCREW (45) for you to ground your turntablesis located on the rear panel. The stereo line inputs will accept any linelevel input such as a CD player, a cassette player, etc.

1. Unscrew the outside FADER PLATE SCREWS (B).

Do not touch the INSIDE SCREWS (C).

2. Carefully lift the fader and unplug the CABLE (D).

3. Plug the new fader into the cable and place it back in themixer.

4. Screw the fader to the mixer.

7. OUTPUT CONTROL SECTION: The level of the AMP OUT (31) iscontrolled by the MASTER (23) slide. The Master TREBLE (20) andBASS (21) controls allow you to adjust the output of channels 1 - 4.

NOTENOTENOTENOTENOTE: The RECORD OUT (32) RECORD OUT (32) RECORD OUT (32) RECORD OUT (32) RECORD OUT (32) has no level control.The level is set by the channel slides of the selectedchannel.

8. TALKOVER SECTION: The purpose of the talkover section is to allowthe program playing to be muted so that the MIC can be heard abovethe music. The MIC/TALKOVER SWITCH (5) controls MIC 1 andhas three settings. When the MIC/TALKOVER SWITCH (5) is in thebottom position, the MIC and talkover are off. When the MIC/TALKOVER SWITCH (5) is in the center position MIC 1 is on, theMIC INDICATOR (6) will glow, but talkover is off. When the MIC/TALKOVER SWITCH (5) is in the top position, MIC 1 and talkoverwill be on and the volume of all sources except the MIC input arelowered by 16dB. The MIC LEVEL (15) controls the level of MIC 1.

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PARTS LIST:

INTEGRATED CIRCUIT NJM2068LDINTEGRATED CIRCUIT NJM4556LINTEGRATED CIRCUIT NJM4558LD(M5218AL,BA4558N)INTEGRATED CIRCUIT NJM4558DDINTEGRATED CIRCUIT NJM7812FAINTEGRATED CIRCUIT NJM7912FAINTEGRATED CIRCUIT LB1403N (BA6124)

ICs

IC7, IC2, IC6, IC5, IC4IC15IC12, IC11, IC8

IC3, IC1IC16IC17IC10, IC14, IC13, IC9

123

4567

074-145074-113074-104

074-163074-107074-114074-022

Item Designators Description Part #

RECTIFIER DIODE 1N4002 (1N4003, 1N4004)LIGHT EMITTING DIODE (GREEN) 3.15

LIGHT EMITTING DIODE (RED) 3.15

LIGHT EMITTING DIODE (YELLOW) 3.15

Diodes

D26, D27D6, D7, D8, D9, D10,D11, D12, D13, D14,D15, D16, D17D1,D2,D3,D4,D5, D22,D23, D24, D25D18, D19, D20, D21

12

3

4

079-027080-104

080-091

080-103

Item Designators Description Part #

Item Description Part #DC JACK 2.5POWER SWITCH ULPHONE JACK XLR DJ MIC

Other

123

092-074083-099092-108

Item Description Part #Mechanical Parts

PANEL CONTROLPANEL REARCOVER BOTTOMSWING LEVELKNOB PUSH (SMALL)BUSHING FOR KNOB (SMALL)KNOB SLIDE (SMALL)KNOB SLIDE (BIG)KNOB ROTARY (A)KNOB INLAY (SILVER)TRIM VRPAD FOOTGIFT BOXOWNER’S MANUALPOLYFORMPOLYFOAM PLATE 140mm×180mm×58mmWARRANTY CARDGND SCREW

123456789

101112131415161718

FACEPPMX1100034-124032-123023-674002-531002-532002-726002-724003-109148-312003-736049-206255-230257-016153-224153-223156-089146-710

LEVER SW 4P2C P=18PUSH SWITCH 2P2C L=12.5PHONE JACK 6.3LEVER SW 4P3C P=24RAILGLIDE VR 45mm X-FADER 100KB×2SLIDE VR 30mm L=15 CUE FADER 20KB×2ROTARY VR 14 (F) L=22.5 CH-TONE 20KW×2 CCROTARY VR 11 (F) L=22.5 BOOTH CUE VOL 50KAROTARY VR 14 (F) L=22.5 CUE 50KA×2SLIDE SWITCH 2P2CSLIDE VR 45mm L=20 CH VOL MASTER 50KA×22P RCA JACK P=14

Electrical Parts

SW8, SW6, SW4, SW2SW9, SW7, SW5, SW3J11, J1SW1X-FADERVR8VR7, VR6VR1VR9SW10, SW11, SW12VR3, VR2, VRV4, VR5, VR10J2, J3, J4, J5, J6, J7, J8, J9, J10

123456789

101112

082-019083-080092-078082-022072-113072-092071-230071-114071-166081-004072-035161-160

Item Designators Description Part #

9. CUE SECTION: By connecting a set of headphones to the HEADPHONE(4) jack, you can monitor any or all of the channels. Press the CUEASSIGN (18) buttons for channels 1 - 4 to select the channel orchannels to be monitored and their respective LED indicators will glow.Use the CUE LEVEL (24) control to adjust the cue volume withouteffecting the overall mix. By moving the CUE PGM PAN (22) control tothe left you will be able to monitor the assigned cue signal. Moving thecontrol to the right will monitor the PGM (program) output. Rotating tothe right will monitor the PGM (program) output.

10. DISPLAY: The DISPLAY (19) indicates the MASTER output left andright levels.

Specifications

INPUTS:

MIC 1..........................................................1.5mV 2kOhm balanced

MIC 2 ..........................................................1.5mV 2KOhm balanced

Phono @ 1kHz..................................................................2mV 47kOhm

Line..............................................................................100 mV 27kOhm

OUTPUTS:

Amp/Booth..............................................................0 dB 1V 400Ohm

Max..............................20V Peak to Peak

Rec..................................................................................225mV 5kOhm

GENERAL:

Bass.............................................................................................± 12dB

High...............................................................................................± 12dB

Frequency Response............................................20Hz - 20KHz +/- 2dB

Distortion..........................................................................less than 0.02%

S/N Ratio.........................................................................better than 80dB

Talkover Attenuation..........................................................................16dB

Power Source.................................................adapter - 115V/15V AC 0.5A

.......................................................................................230V/15V AC 0.5A

Dimensions.......................................19”w x 3”d x 7”h (483 x 76 x 178 mm)

Weight........................................................................6.25lbs (2.84 kg)

PMX1100

224C85

22/16

C84

22/16

C12

10KR6

10KR17

10KR97

47KR100

47KR101

+12-12

J1

SRT

30K1 1%R12

1K 1%R15

1K 1%R9

22/16

C24

22/16

C19

22/16

C11

47/16C18

47/16C17101

C13

101

C1430K1 1%R11

10R1810

R19

4558LD

IC3B

75

6

4558LD

IC3A

84

13

2

+12

-12

X8

2

1

6K2R182

6K2R176

3K6R171

3K6R169

2K4R155

2K4R144

2K4R133

2K4R129

2K4R124

3K6R117

6K2R175

6K2R170

3K6R168

3K6R154

2K4R146

2K4R137

2K4R132

2K4R128

2K4R123

R

L

6

5

4

3

2

1

X4

X1

J11

SRT

SOCKET03

X10

XLRXLR1

3-

1G

2+

X2

MIC XLR

LN7

PH3/LN6

LN5

PH2/LN4

PH1/LN2

MIC

LN3

LN1

X11

SW10B4

65

SW10A1

32

X12

SW11B4

65

SW11A1

32

X133

2

1

SW12B4

65

SW12A1

32

22/16

C15

+12

7912IC17

7812IC16

-12

1/16C125

1/16C126

103C135

1000/25C133

1000/25C134

1N4002D26

1N4002

D27

22/16

C124

4558LD

IC12A

84

13

2

4558LD

IC12B

75

6

ML

MR

MR

ML

47KR127

330R131

47/16

C87

10/16

C113

10/16

C106PLUG03

X7

222C132

222C131

56R188

56R187

36K

R18422/16

C123-12

+12

10R17710

R186

56

C129

56

C128

470/16C136

470/16C127

4.7/16

C121

4.7/16

C120

2K7R167

36KR185

2K7R178

100KR173

100KR172

4556

IC15B

75

6

4556

IC15A

84

13

2

50KA

VR9B

50KA

VR9A

A3

A2

A1

20KBX2

VR8A

20KBX2

VR8B

51KR166

22/16

C98 56C112

4558LD

IC11B7

5

6

51KR143

51KR165

22/16

C100

+12-12

22/16C117

22/16C103

56C102

4558LD

IC11A

84

13

2

10R139

10R152

51KR134

10KR147

10KR145

10/16

C89

10/16

C86 J9

G

R

L

47KR119

330R122

47/16

C88

10/16

C1300.1/16C116

10/16C99

10/16C122

0.1/16C10410/16

C96

8K2

R18110KR174

160K

R183120KR153

100KR141

10KR135

8K2R179

10KR164 160K

R180120KR140

100KR136

10KR130

LED

D25

LED

D23

LED

D21

LED

D19

LED

D17

LED

D15

LED

D13

LED

D11

LED

D9

LED

D7

LED

D24

LED

D22

LED

D20

LED

D18

LED

D16

LED

D14

LED

D12

LED

D10

LED

D8

LED

D6

LB1403N

IC14

5 87

43 62 91

LB1403N

IC10

5 87

43 62 91

LB1403N

IC13

5 87

43 62 91

LB1403N

IC95 87

43 62 91

2KR142

2KR149

201

C114

10/16

C118

820R160

9K1R150

100KR161

50KAX2

VR10B2KR159

2KR156

10/16

C111

4558LDIC8B

75

6

20KWX2VR6B

B3

B2

B1

20KWX2VR6A

A3

A2

A1

222C95

104C92104

C93

56

C1014K7R121

4K7R118

4K7R126

10KR125

10/16

C107

-12 +12

22/16C109

22/16C108

4558LDIC8A

84

13

2

20KWX2VR7B

20KWX2VR7A

A3

A2

A1

222C90

104C91104

C94

56

C97

10R157

10R158

4K7R114

4K7R115

4K7

R120

10KR116

50KAX2

VR10A

-12+12

10R14810

R138

201

C115

22/16C110

22/16C105

10/16

C119

820R163

9K1R151

100KR162

J10

2068LD

IC7B7

5

6

2068LD

IC7A

84

13

2

100/16

C81

100/16

C83

68KR104

56C74

+12-12

22/16C79

22/16C80

56C75

10R109

10R95

68KR99

2068LD

IC2B

75

6

2068LD

IC2A

84

13

2

SW03*4

SW1A

SW03*4

SW1B

18KR7

22/16

C20

33PC21

100KR13

18KR8

+12-12

22/16C16

22/16C8

22/16

C10

33PC23

10R10

10R25

100KR14

-12

+12

LEDD1

4K7R16

SW03*4

SW1D

SW1C

15P

C3

50KA

VR13

2

1

12KR4

+12-12

30K1 1%R2

1K 1%R5

1K 1%R1

22/16

C6

22/16

C5

22/16

C4

47/16C9

47/16C7101

C1

101

C230K1 1%R3

10R2110

R20

4558LD

IC1B

75

6

4558LD

IC1A

84

13

2

SW6B

SW6D

SW6C

SW6A

SW4B

SW4D

SW4C

SW4A

X6

X5

X3

SW9B

4 65

SW9A

1 32

36KR106

-12

LEDD536K

R103

36KR102

4K7R111

36KR105

24KR112

24KR113

24KR107

24KR98

50KAX2

VR5B

SW7B

4 65

SW7A

1 32

36KR76

-12

LEDD436K

R80

36KR79

4K7R87

36KR75

24KR74

24KR73

24KR69

24KR66

50KAX2

VR5A

50KAX2

VR4B

SW5B

4 65

SW5A

1 32

36KR48

-12

LEDD336K

R51

36KR50

4K7R60

36KR47

10/16

C22

50KAX2

VR4A

47KR29

47KR32

24KR53

24KR52

SW8D

10

1211

SW8C

7

98

SW8B4

65

SW8A1

32

SW3B

4 65

SW3A

1 32

36KR24

50KAX2

VR2B

50KAX2

VR2A

-12

LEDD236K

R28

36KR27

4K7R38

36KR23

SW2B

SW2D

SW2C

SW2A

10/16

C25

24KR61

24KR63

50KAX2

VR3B

50KAX2

VR3A

J8

J6

J7

J4

J5

J2

J3

G

R

L

10/16

C78

10/16

C76

101C82

101C77

1K8R110

1K8R108

1K8R85

1K8R81

1K8R54

1K8R58

1K8R34

1K8R30

10/16

C61

10/16

C63

10/16

C58

10/16

C62

101C60

101C59

1K8R78

1K8R77

1KR88

1KR84

47/16

C68

47/16C70

47/16C73

47/16C71

822

C66

273

C69

56

C72

273

C64

56

C65

822

C67

100KR90

180R93

47KR92

8K2R89

47KR82

180R96

8K2R86

10R9410

R91100KR83

2068LDIC6B

75

6

2068LD

IC6A

84

13

2

-12+12

10/16

C45

10/16

C47

10/16

C42

10/16

C46

101C44

101C43

1K8R49

1K8R46

1KR64

1KR57

47/16

C53

47/16C54

47/16C57

47/16C55

822

C49

273

C52

56C56

273

C48

56

C51

822

C50

100KR65

180R68

47KR67

8K2R62

47KR55

180R708K2R59

10R7210

R71100KR56

2068LDIC5B

75

6

2068LD

IC5A

84

13

2

-12+12

10/16

C29

10/16

C31

10/16

C27

10/16

C30

101C28

101C26

1K8R26

1K8R22

1KR39

1KR36

47/16

C41

47/16C38

47/16C40

47/16C37

822

C33

273

C36

56

C39

273

C32

56

C35

822

C34

100KR40

180R42

47KR41

8K2R37

47KR33

180R43

8K2R35

10R4510

R44100KR31

2068LDIC4B

75

6

2068LD

IC4A

84

13

2

-12+12

J10

J8J8

J7J6

J5J4

J3J2

C13

3

C21

C23

R55

C13

4

VR

5

1

VR

4

1

X9

R17

R6

X8

C135

D27

D26

SW

3S

W5

SW

7S

W9

X4

C114

J1

SW

12S

W11

C41

C40

R43

R42

C39

R81

R54

R30

C30

R36

C38

C37

R34

R40R39C

35R

33

R41

C31

C33

R37

C36

R31 C32

R35

C34

IC4

C55

C54

R64

R67

C56

R58R57

R62

R65

C49

C42

R49

R46

C43

C44

C57

R68

R70

C53

C51

C47

C52

C45

C46

R56 C48

R59

C50

IC5

R4

IC8

R187

R188

R175

R13

7

R117

R12

4D

5D

4D

3D

2

R60

R38

VR

1

C11

6C

104

IC9

IC13

VR

6

VR

7

R129

R14

5

11 12

C83

R95

R1

C2

C1 R2

C6

IC1

R5

X2

IC3

R19R18

R16

R8

C20

C22

C16

R14

R13

C10

6C

132

R185C129

R109

R16

7

R183

9

C92

C14

C18C13

C11

R11R12

R9

R15C19

R123

R128

R132

R146

R154

R16

8R

170

R133

R144

C24

R155

R169

R17

1

R182

R69

R66R63

R61

R53

R32

X7

C61

R78 C62

SW

2

R16

0

R165

C5

C4

R7

C68

C63

R84

R77

C59

R88

C72

R92

R21

C15

C7

R14

1

R14

3

R166

D25D24

D23

D22

D21

D20

D19

D18

D17

D16

D15

D14

D13D

12

D11

D10

D9

D8

D7

D6

D1

IC14

IC10

R179

R89

R86

C67

C66

R150

C128

C11

5

C10

2

C10

1

C97

R12

6

R121

R120

R118

R111

R87

C70

C71

R20

R94

R72

R71

R45

R44

IC11

IC15

C12

1

R184

R102

R80R79

R76R75

R51

R48R47

R28R27

R24

R103

R106

R159

C69

C64

C12

4

C12

3

C11

7

C11

0

C10

8

C105

C10

3

C100

C8

IC6

IC2

R85

R16

4

R17

4

R13

5

R12

5

C82

C60

R17

3

R17

2

R16

2

R16

1

R90

R83

C13

0

C11

9

C11

8

C11

3

C99

C96

C58

R14

8R

139R138

R25

R15

8

R15

7

SW

1

SW

4

16

14

13

2

C9

R23

R181

R13

6R

130

R3

R50

R11

3

R11

2

C73

R93

C93 C94

C95

R115

C75

IC7

R99C74

C79

SW

6

C11

1

R180

C10

9

21

R15

3

15

R15

2

IC12C10

7

R147

R149

R156

VR

10

1

R17

6

18

17

3

R116

R91

R114

R13

4

R178

R151

R119

R122

R110

R10

8

R104

R16

3

C65

C91

C90

C131

C77

C25

C12

2

C89

C86

C98

R96

R82

R140

C12

0

C3

VR

8

VR

9

C88

C87

C17

R142

10

C81

C80

C11

2

4

C28

C26

C29

R22

R26

C27

8

R107

R98

7

6

5

R12

7R

131

X10 J1

1

SW

10X

11

R52

R73

R74

R10

R105

SW

8

R97

C78

C76

R10

0

R10

1

1

C84

C12

C85

R29

C10

VR

2

1

VR

3

1

VR

11

X3

X5

X12

X13

C12

6

IC16

25

2219

20

24

C12

5

C12

7C

136

IC17

23

R17

7

R18

6

X6