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SERVICE MANUAL

PMX-80

Stereo Preamp Mixer

CONTENT'S:
Connections & Operations:.......................................................Page 2-4 Specifications:..............................................................................Page 5 Parts Lists:.................................................................................Page 6-8 PCBs:..........................................................................................Page 7-9 Schematics:.................................................................................Page 10

Gemini Sound Products Corp. 120 Clover Place P.O. Box 6928 Edison, NJ 08818-6928 732-738-9003 (Phone) · 732-738-9006 (Fax)
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9

1

2

3

4

5

1

2

3

4

5

7

6

8

10

Page 2

19 11

29

12

20

30

13

21

31

14 15

22

32 33

23

24

16 25

34

26 17 35

27

18 28
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36

Connections
1. Make sure that the POWER (6) switch is in the OFF position. This unit comes supplied with a 15 volt AC adaptor. Plug the male pin of the adaptor into the rear panel POWER JACK (7). Then plug the adaptor into a proper power source. 2. The MASTER OUTPUT (1) jacks are unbalanced and used to connect to your main amplifier. 3. The DJ MIC (18) input (found on the front panel) accepts a 1/4" connector and balanced and unbalanced microphones. 4. On the rear panel are 2 stereo PHONO/LINE (3, 4) inputs, 1 stereo PHONO (5) input and 1 stereo LINE (2) input. The PHONO/LINE SWITCHES (8, 10) enable you to set the (3, 4) inputs to Phono or Line. The phono inputs will accept only turntables with a magnetic cartridge. A GROUND SCREW (9) for you to ground your turntables is located on the rear panel. The stereo line inputs will accept any line level input such as a CD player, a cassette player, etc. 5. Headphones can be plugged into the front panel mounted PHONES (36) jack.

The CROSSFADER CURVE SWITCH (28) allows you to adjust the kind of curve the crossfader has. When the switch is in the left position, the curve is gradual and gentle. When the switch is in the right position, the curve is steep and cutting (perfect for scratching). The CROSSFADER REVERSE SWITCH (26) allows you to reverse the crossfader so that CHANNEL 2 is controlled by the left side of the crossfader and CHANNEL 1 is controlled by the right side of the crossfader. NOTE TE: CROSSF OSSFADER SWITCH NO TE W hen the CR OSSFADER REVERSE SWIT CH (26) is activated (moved to the right), only the crossfader reverses. The Channel Slides, Gain, Kill Switches and tonal controls do not reverse. 6. OUTPUT CONTROL SECTION: The level of the MASTER OUTPUT (1) is controlled by the MASTER (21) control. 7. TALKOVER SECTION: The purpose of the talkover section is to allow the program playing to be muted so that the mic can be heard above the music. The MIC/TALKOVER (19) switch has three settings. When the MIC/TALKOVER (19) switch is in the left position, the mic and talkover are both off. When the MIC/TALKOVER (19) switch is in the center position the mic is on, the MIC INDICATOR will glow, but talkover is off. When the MIC/TALKOVER (19) switch is in the right position, the mic and talkover will be on and the volume of all sources except the Mic input are lowered by 16 dB. MIC LEVEL (20) controls the level of the MIC. 8. CUE SECTION: By connecting a set of headphones to the PHONES (36) jack, you can monitor either channel or both together. Move the CUE SWITCH (25) to the left to monitor CHANNEL 1. Move the CUE SWITCH (25) to the right to monitor CHANNEL 2. Move the CUE SWITCH (25) to the center position to split the signals from each channel so that CHANNEL 1 will be heard in one earphone and CHANNEL 2 will be heard in the other earphone. Use the CUE LEVEL (22) control to adjust the headphone volume without effecting the overall mix. 9. DISPLAY: The DISPLAY (24) indicates the MASTER output.

Operation
1. POWER ON: Once you have made all the equipment connections to your mixer, press the POWER (6) switch. The power will turn on and the POWER LED (23) will glow RED. 2. CHANNEL 1: The GAIN (11), HIGH (12), MID (13), and LOW (14) controls allow you to fully adjust the selected source. Switch # (15) allows you to select either the PHONO 1 (5) or the PHONO 2/LINE 1 (4) input. The CHANNEL SLIDE (16) controls the output level of this channel. 3. CHANNEL 2: The GAIN (29), HIGH (30), MID (31), and LOW (32) controls allow you to fully adjust the selected source. Switch # (33) allows you to select either the PHONO 3/LINE 2 (3) or the LINE 3 (2) input. The CHANNEL SLIDE (34) controls the output level of this channel. 4. KILLING LOW FREQUENCIES: You can use the Kill Feature on each channel to remove Low band frequencies to create special effects and improve your mix. Move the KILL SWITCH (17) down to remove the low band of Channel 1 from your mix. Move the KILL SWITCH (35) down to remove the low band of Channel 2 from your mix. 5. CROSSFADER SECTION: The CROSSFADER (27) allows the mixing of one source into another. The left side of the CROSSFADER (27) is CHANNEL 1 and the right side is CHANNEL 2. The CROSSFADER (27) in your unit is removable and if the need arises can be easily replaced. Crossfader units are available in three varieties. Part # RF-45 (which is identical to the crossfader supplied 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 the PSF-45 with a special curve designed for scratch mixing. Just purchase one of these crossfader units from your Gemini dealer and follow these instructions: 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 the mixer. 4. Screw the fader to the mixer.

Specifications
INPUTS: DJ Mic..............................................................1.5mV 600 Ohm Phono.........................................................................3mV 47Kohm Line.......................................................................150 mV 27Kohm OUTPUTS: Amp.................................................................0 dB 1V 400ohm Max..............................20V Peak to Peak GENERAL: Low (Channels 1 - 2)........................................................+ 12dB/-32 dB Mid (Channels 1 - 2).........................................................+ 12dB/-32 dB High (Channels 1 - 2).....................................................+ 12dB/-32 dB Gain (Channels 1 - 2)...........................................................0 to -20dB Frequency Response....................................20Hz - 20KHz +/- 2dB Distortion................................................................................0.02% S/N Ratio...............................................................better than 80dB Talkover Attenuation..............................................................-16dB Headphone Impedance.........................................................16ohm Power Source........................................................115V/15V AC 7.5W 230V/15V AC 7.5W Dimensions.......................................6.5" x 14" x 3" (165 x 355 x 85 mm) Weight........................................................................................5 lbs (2.27 kg)

Page 4

Parts Lists
Cabinet Parts and Packing
Item # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Description PANEL CONTROL PANEL REAR BOTTOM COVER BRACKET VR (SUB CHASSIS) HOLDER FADER KNOB SWING (LONG) KNOB PUSH (SMALL) KNOB SLIDE (BIG) KNOB ROTARY (B TYPE) INLAY KNOB (BLACK) INLAY KNOB (GRAY) INLAY KNOB (RED) TRIM VR HOLDER LED (3f 17mm) PAD FOOT DUST PROOF CLOTE-VR SWING DUST PROOF CLOTH GND SCREW BUSHING WIRE BAND-HEAD TAPPING SCREW/TW-E 3×6(AB) FLAT-HEAD TAPPING SCREW 3f×6(AB) BAND-HEAD TAPPING SCREW 3×6(AB) FLAT-HEAD TAPPING SCREW 3f×12(AB) BAND-HEAD TAPPING SCREW 3f×5(AB) BAND-HEAD TAPPING SCREW (TWIN) 3f×8 (AB) PAN-HEAD MACHINE SCREW 2.6f×4(B) Part # 002-223 034-020 032-027 021-776 022-367 023-674 002-531 002-704 003-110 148-236 148-239 148-238 003-970 003-969 049-206 159-171 159-216 146-710 049-190 121-003A 111-043A 111-046A 111-049A 111-051A 110-172A 102-025

Printed Circuit Boards
Item # 1 2 3 Description PRINTED CIRCUIT BOARD PMX80-1 PRINTED CIRCUIT BOARD PMX80-2 PRINTED CIRCUIT BOARD PMX80-3 Part # 262-073 262-074 262-075

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Parts Lists - PCB1 Input Output
ICs
Item # 1 2 3 Designators IC1, IC2, IC3 IC5 IC4 Description INTEGRATED CIRCUIT NJM2068LD INTEGRATED CIRCUIT NJM7912FA INTEGRATED CIRCUIT NJM7812FA Part # 074-145 074-114 074-107

Electrical Parts
Item # 1 2 3 4 5 6 Designators D3, D4 D1, D2 SW3 J4 J1 J2 Description RECTIFIER DIODE 1N4002 (1N4003,1N4004) ZENER DIODE 1/2W 12V SLIDE SWITCH DC JACK 2.5 4P RCA JACK 6P RCA JACK Part # 079-027 079-012 081-038 092-135 161-105 161-106

Parts Lists - PCB2 Main

ICs
Item # 1 2 3 4 Designators IC4 IC10 IC1-2, IC6, IC8, IC9 IC3, IC7 Description INTEGRATED CIRCUIT NJM2068LD INTEGRATED CIRCUIT NJM4556AD INTEGRATED CIRCUIT NJM4558LD INTEGRATED CIRCUIT OR LB1423N Part # 074-145 074-100 074-104 074-154

Electrical Parts
Item # 1 2 3 4 5 6 Designators D9-12 SW4 SW2, SW5, SW7 VR3, VR9 VR8 VR6 Description LIGHT EMITTING DIODE (GREEN) 3.15f SLIDE SWITCH LEVER SWITCH 4P2C ROTARY VR 16f L=20 GAIN 10KA×2 ROTARY VR 16f L=20 MIC 50KA ROTARY VR 16f L=20 MASTER, 500KA×2 Part # 080-104 081-038 082-019 071-161 071-066 071-158

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-15 -9 -3 0 +3
+VCC

Schematic

-15 -9 -3 0 +3

R45 47

R69 47

MIC OFF MIC ON TALKOVER
1 2 3 4 6 9 1 2 3 4 6

D5 LED

D4 LED

D3 D2 LED LED

D1 LED

D8 LED

D9 LED

D10 D11 LED LED

D12 LED

IN/OUT PCB
R31 SW3D IC3 LB1403N 7 5 8 7 5 8 C52 C35 C40 R48 R11 33K VR2A 50KEx2 R47 5 3K3 10/16 10/16 300K R72 300K SW3C SW1A +VCC 4K3 D6 LED C31 R73 390K 2 1 10/16 3 8 IC2-8 -VCC SW3A C19 R59 C38 6.8P VR6A 500KA 4 2068LD IC3-4 3 R50 30K 2068LD C41 68P 1 1K 1% R56 30K1 1% R76 2 VR3A C23 3 10KAx2 IC5-4 R9 100K 50KA R33 1K5 50KEx2 R30 33K R17 4K7 R20 33K 75K 75K VR2B 50KEx2 SW6A 6 6 VR5B 5 10KAx2 10/16 R22 1K 50KA SW6B R83 1K5 50KEx2 33K R85 4K7 SW5A R103 33K VR13A 50KEx2 2 VR9A C77 3 4 10/16 IC8-4 C67 R84 1K5 50KEx2 R89 33K R112 4K7 R100 33K 182 VR13B 50KEx2 6 6 C73 VR11B 10KAx2 R98 1K 50KA R111 100K 10/16 4558LD 10/16 R109 24K 10/16 33K 103 C71 682 8K2 4558LD 5 R125 20K R65 10 IC2-4 IC5-4 C51 C43 22/16 R46 SW4C VR7A 50KA C36 22P IC5A 1 R52 SW4A 43K 47/16 3 4558 4 R54 C34 10 22/16 8 C39 2 43K R67 C49 22/16 R116 2K 2 3 4556 -VCC 4 C83 10 +VCC R118 C80 22P 8 IC10A 1 C82 220/16 R120 47 R123 10 220/16 R60 SW4B VR7B 50KA C45 22P C42 R63 43K 6 SW4D 47/16 5 4558 IC5B 7 R117 2K 6 5 4556 R119 20K C81 22P IC10B 7 R121 47 43K -VCC 1N4002 10 R122 20K 22/16 C2 R113 10 C78 22/16 C13 22/16 C65 22/16 22/16 SW3A 7 R106 5 -VCC 2 D1 R70 10 IC3-4 R6 10 IC6-4 R115 10 IC7-4 R3 10 IC8-4 Z 12V R105 IC9B C55 C69 7 IC8B C76 5K6 R99 C74 562 C75 56P R80 4K3 C66 IC2-8 R64 75K R35 75K 22/16 22/16 22/16 22/16 22/16 22/16 J4 1 C47 SW8A R49 10 IC5-8 C37 C10 R114 10 SW3B C64 C5 C72 SW6D R71 10 IC3-8 R5 10 IC6-8 R102 10 IC7-8 R2 10 IC8-8 C58 154 75K +VCC 4K3 R81 3K6 1K5 R124 20K 182 R43 R36 75K 1N4002 R48 750 D3 R92 VR10B R101 SW8B SW5D L 1 10KAx2 IC6-4 R110 100K 50KA 1K R97 SW7C R93 24K 4 10/16 SW7A VR11A 4558LD 10/16 103 33K C62 682 8K2 4558LD SW6C 1 R107 3 2 R108 2 IC9A C56 C70 1 IC8A C79 SW5C 5K6 8 IC8-8 3 R104 C68 562 C61 56P 5 SW5B 4 C57 154 R86 3K6 1K5 R94 VR10A R82 R10 100K 4K3 75K 75K R77 390K C32 6 10/16 5 IC6B 4558LD 6.8P 7 4558LD 10/16 10/16 R16 24K 103 33K R79 R61 R37 C12 682 8K2 4558LD R62 20K 182 C24 7 R29 5 SW3B 500KA C44 R13 IC2B C28 C15 7 VR6B IC1B C6 C18 5K6 SW1B R7 C11 562 C4 56P 4K3 R51 20K R58 182 R53 R39 C25 154 C27 154 SW2B R28 VR1B 3K6 1K5 R32 VR4B R18 SW2C R21 1K 4 10/16 IC7-4 R25 24K 4 SW2A VR5A 4558LD 10/16 103 10/16 33K C20 682 8K2 4558LD 1 R24 3 R12 2 IC2A C26 C14 1 C16 22/16 IC1A C1 5K6 8 IC7-8 1K 1% 7 2 C50 6 R55 C46 R8 IC3-8 IC4A 8 C3 562 J1 R40 IC4B 1 2 3 10/16 C30 0.47/16 10/16 -VCC C22 56P 68P 22P C7 22/16 30K1 1% C29 R42 10K C53 R38 4K3 R75 10K R78 4K3 0.47/16 VR8 50KA 1K5 50KEx2 R27 33K R14 4K7 C21 154 3K6 1K5 R34 VR4A R26 IC7

MAIN PCB

9

GREEN GREEN RED GREEN RED RED

GREEN GREEN RED GREEN

LB1403N

C5

R12 R23 C8 2K4 50KEx2 VR1A

R9

R13

C17 154

47/16

180

8K2 C9

100K C11

8

822

+1

273

MIC

2 R4 2K 8 5K6 IC5-8 R19

1

R14

C12

181

J1A

R8 3 1K

1K

10/16

R11 47K

C8

4

IC1A -1 2068LD

56

PH1;PH2\LN1

PH1

R74 30K

R7 47K

C4

56

R4

IC1B 2068LD

X1

X1

5

1K

7

R3

C7

6

C1 47/16

1K

10/16

R1

C6

C2

180

822 R6

273 R5

CURVE

PH2/L2
GAIN
C9 2K4 50KEx2 181 SW2D VR3B 2K 5K6 R1 R15

8K2

100K

CH-1

C24

R28

R24

R26

C33 10/16 IC6A IC2-4 4558LD 4

R41 430 J2C X2 R44 47K X4

SW1A

47/16

180

8K2 C18

100K C23

SW1B

822

273

6

7

R25

C19

MASTER
R68 47K C48 10/16 R66 430 -VCC

J1B

R23 5 1K

1K

10/16

R22 47K

C21

IC2B 2068LD

56

PH2/L2 NORM/REV
X-F

R16 47K

C16

4

56

R20 C54 154

3

IC2A 2068LD -3

1K

1

R15

C13

X-FADER X3 R 6

R57 1K

2 R90 C59 2K4 50KEx2 181 R87 2K 8 5K6 IC6-8 R95 VR12A

R17

8

C20 47/16

1K

10/16

1 -2 \ 2 -1

C17

+3 C14

180

822 R21

273 R18

POWER

D7 LED

8K2

100K

PH3/L2
LN3;PH3\LN2

8

C32 C63 154 SW7B R91 VR12B

4

C44 1000/25

GND

R34 47K

GAIN
C60 2K4 50KEx2 181 SW7D 2K VR9B 5K6 R88 R96

CH-2

R32

IC3B 2068LD

5

1K

7

R31

C30

6

2

D4 2 Vin C47 IC5 1000/25 7912

GND

R47 750

1

Page 8
CUE LEVEL
+VCC

C29

R39 180

R40

R41

SW2A

47/16

8K2 C33

100K C36

SW2B

822

+2

273

2

IC3A

C35

X2

X5

J2A

R36 3 1K

1 R42 1K 2068LD

10/16

IC4 7812 +VCC 1 Vin Vout 3 C43 1/50

R38 47K

-2

PH3/L2

56

C28 56

C25 47/16

1K

10/16

POWER
+1

R2 10 +2

R30 10 +3

R27 10 X3 X4

R29

C31

C26

AC15V-JACK
D2 Z 12V

180

C48 100/16

C3 22/16

C27 22/16

C22 22/16

822 R35

273 R33

J2B

R43

8K2

100K

C37

+VCC C45 100/16 -VCC

1K

C38 101

10/16

L3

R44

C39 101

C40

1K

10/16

C10 22/16

C34 22/16

C15 22/16

C46 -1 1/50 Vout 3

R10 -2 10

R37 -3 10

R19 10

CH1 SPL CH2

-VCC

SW4

1 2 3

J2

CUE