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SERVICE MANUAL

PDM-10

Stereo Preamp Mixer

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

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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1 9 11 13 19 18 18 18 18 20 10 12 14 23 26 25

7

2

3

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16 17

8

4

21

27

6

5 22 24 28

15

30 30 32 32 33 33 34 34 35 35 37 37 38 38 31

31

40

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41

43

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44

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29 46 36 45 39 42

Connections
1. Before plugging in the power cord, make sure that the VOLTAGE SELECTOR (29) switch is set to the correct voltage. NOTE: NOTE This product is double insulated and not intended to be grounded. 2. Make sure that the POWER (25) switch is in the off position. The POWER LED (26) will be off. 3. The PDM-10 is supplied with 3 sets of amp output jacks. The MAIN OUTPUT (31) jacks are unbalanced and used to connect to your main amplifier. The REC OUTPUT (32) jacks can be used to connect the mixer to the record input of your recorder enabling you to record your mix. The BOOTH OUTPUT (30) jacks allow you to hook up an additional amplifier. 4. For your convenience, there are 2 inputs for the mic. The MIC (1) input (found on the front panel) accepts an XLR connector. The MIC (44) input (found on the rear panel) accepts 1/4" connectors. All accept balanced and unbalanced microphones. 5. On the rear panel are 3 stereo PHONO/LINE (35, 38, 41) inputs and 5 stereo LINE (33, 34, 37, 40, 43) inputs. The PHONO/LINE SWITCH (36) enables you to set the (35) input to Phono or Line. The PHONO/ LINE SWITCH (39) enables you to set the (38) input to Phono or Line. The PHONO/LINE SWITCH (42) enables you to set the (41) input to Phono or Line. The phono inputs will accept only turntables with a magnetic cartridge. A GROUND SCREW (45) 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. 6. Headphones can be plugged into the front panel mounted HEADPHONE (28) jack.

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 the input level of this channel. 5. CHANNEL 4: Switch # (13) allows you to select the LINE 7 (34) or the LINE 8 (33) input. The CHANNEL SLIDE (14) controls the input level of this channel. 6. CROSSFADER SECTION: The CROSSFADER (16) allows the mixing of one source into another. The PDM-10 features an assignable crossfader. The ASSIGN (15, 17) switches allow you to select which channel will play through each side of the crossfader. The ASSIGN (15) switch has 5 settings (OFF, 1, 2, 3 or 4) and allows you to select channel 1, 2, 3 or 4 to play through the left side of the crossfader. The ASSIGN (17) switch has 5 settings (OFF, 1, 2, 3 or 4) and allows you to select channel 1, 2, 3 or 4 to play through the right side of the crossfader. With the ASSIGN switch in the off position, that side of the crossfader will be inactive. The CROSSFADER (16) 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.

Using the Ground Lift Switch
Depending on your system configuration, sometimes applying the ground will create a quieter signal path. Sometimes lifting the ground can eliminate ground loops and hum to create a quieter signal path. 1. With the mixer on, listen to the system in idle mode (no signal present) with the ground applied (the GROUND LIFT SWITCH (46) in the left position). 2. Then turn the power off before moving the GROUND LIFT SWITCH (46). Lift the ground by moving the GROUND LIFT SWITCH to the right, turn the power back on and listen to determine which position will provide a signal devoid of background noise and hum. Keep the GROUND LIFT SWITCH in the ground position if the noise level remains the same in either position. CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER MIXER IN ANY WAY. TERMINATION OF THE AC GROUND CAN BE HAZARDOUS. 7. OUTPUT CONTROL SECTION: The level of the MAIN AMP OUT (31) is controlled by the MASTER (23) slide. The Master TREBLE (20) and BASS (21) controls allow you to adjust the output of channels 1 - 4. The BOOTH (27) control adjusts the level of the BOOTH OUTPUT (30). HINT: The booth output is used by some DJs to run monitor speakers in their DJ booth. You can also use it as a second ZONE or AMP output. NOTE: NOTE The RECORD OUT (32) has no level control. The level is set by the channel slides of the selected channel. 8. 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 SWITCH (5) has three settings. When the MIC/TALKOVER SWITCH (5) is in the bottom position, the mic and talkover are both off. When the MIC/TALKOVER SWITCH (5) is in the center position the mic is on, the MIC INDICATOR (6) will glow, but talkover is off. When the MIC/TALKOVER SWITCH (5) is in the top position, the mic and talkover will be on and the volume of all sources except the Mic input are lowered by 16 dB. The TREBLE (2) and BASS (3) controls allow you to fully adjust the tone of the MIC. LEVEL (4) controls the level of the MIC.

Operation
1. POWER ON: Once you have made all the equipment connections to your mixer, press the POWER SWITCH (25). The power will turn on and the POWER LED (26) will glow RED. 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 the input 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 the input level of this channel.

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9. CUE SECTION: By connecting a set of headphones to the HEADPHONE (28) jack, you can monitor any or all of the channels. Press the CUE ASSIGN (18) buttons for channels 1 - 4 to select the channel or channels to be monitored and their respective LED indicators will glow. Use the CUE LEVEL (24) control to adjust the cue volume without effecting the overall mix. By moving the CUE PGM PAN (22) control to the left you will be able to monitor the assigned cue signal. Moving the control to the right will monitor the PGM (program) output. Rotating to the right will monitor the PGM (program) output. 10. DISPLAY: The DISPLAY (19) indicates the MASTER output left and right levels.

Parts Lists
Cabinet Parts and Packing
Item # 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Description PANEL CONTROL PANEL REAR COVER BOTTOM BRACKET VR HOLDER X-FADER PROTECTOR PLATE FOR 115/230V SWITCH SWING LEVEL KNOB PUSH (SMALL) BUSHING FOR KNOB (SMALL) KNOB SLIDE (SMALL) KNOB SLIDE (BIG) KNOB ROTARY (ASSIGN) KNOB ROTARY (B) KNOB INLAY (BLACK); LEVEL,BALANCE,CUE KNOB INLAY (GRAY); TREBLE,BASS TRIM VR HOLDER LED 3f LED(17mm) WASHER XLR PAD FOOT DUST PROOF CLOTH (VR) DUST PROOF CLOTH (KNOB-SWING) DUST PROOF CLOTH (VR) GND SCREW PAN-HEAD MACHINE SCREW; PMS 2X4(B) PAN-HEAD MACHINE SCREW; PMS 2.6X4(B) BAND-HEAD TAPPING SCREW/TWIN SCREW; BTS-2 3X8(AB) TWIN FLAT-HEAD TAPPING SCREW; FTS-3 3X6(AB) BAND-HEAD TAPPING SCREW; BTS-3 3X10(AB) BAND-HEAD TAPPING SCREW; BTS-3 3X6(AB) FLAT-HEAD TAPPING SCREW; FTS-3 3X12(AB) FLAT-HEAD TAPPING SCREW; FTS-3 3X12(Y) BAND-HEAD TAPPING SCREW; BTS-3 3X5(AB) BAND-HEAD TAPPING SCREW/TW-E; BTS-3/ TW-E 3X6(AB) NUT/WASHER 3mm Part # 002-204 021-993 032-017 021-762 022-322 022-305 023-674 002-531 002-532 002-703 002-704 003-102 003-110 148-236 148-239 003-970 003-969 003-564 049-206 159-167 159-216 159-171 146-710 102-007 102-025 110-172A 111-043A 111-044A 111-046A 111-049A 111-050 111-051A 111-053A 131-081

Specifications
INPUTS: DJ Mic....................................................1.5mV 2Kohm balanced Phono.........................................................................3mV 47Kohm Line.......................................................................150 mV 27Kohm OUTPUTS: Amp/Booth......................................................0 dB 1V 400ohm Max..............................20V Peak to Peak Rec...........................................................................225mV 5Kohm MIC: DJ Mic....................................................1.5mV 2Kohm balanced Bass......................................................................................± 12dB High.......................................................................................± 12dB GENERAL: Frequency Response....................................20Hz - 20KHz +/- 2dB Distortion................................................................................0.02% S/N Ratio...............................................................better than 80dB Talkover Attenuation..............................................................-16dB Headphone Impedance.........................................................16ohm Power Source.............................................115/230V 50/60Hz 10W Dimensions..........................................................19"w x 4"h x 9"d Weight........................................................................10.17 lbs

Printed Circuit Boards
Item # 1 2 3 4 5 Description PRINTED CIRCUIT BOARD SWITCH (V0 12×146) PRINTED CIRCUIT BOARD MAIN PRINTED CIRCUIT BOARD MASTER VR PRINTED CIRCUIT BOARD FADER (V0 73.5×13) PRINTED CIRCUIT BOARD PHONES (V0 14.5×27) PDM10-1: PDM10-2: PDM10-3: PDM10-4: PDM10-5: Part # 262-039 262-040 262-041 262-042 262-043

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Parts Lists - PCB 1, 2, 4
ICs
Item # Designators 1 2 IC1 IC2-6 Description INTEGRATED CIRCUIT NJM4558LD INTEGRATED CIRCUIT NJM2068LD Part # 074-104 074-145

Diodes
Item # 1 Designators D1-5 Description LIGHT EMITTING DIODE (RED) 3.15f Part # 080-091

Electrical Parts
Item # 1 2 3 4 5 6 7 8 9 10 11 Designators J1 J2-9 SW2, 5, 8 SW3, 7, 10, 12 SW1 SW4, 13 SW6, 9, 11, 14 VR4-7 X-FADER VR1-2 VR3 Description PHONE JACK 6.3f 2P RCA JACK P=14mm SLIDE SWITCH 2P2C LEVER SW 4P2C LEVER SW 4P3C ROTARY SWITCH 1-2-5 L=17 FAD ASSIGN PUSH SWITCH 2P2C L=12.5 SLIDE VR 45mm L=20 CH VOL MASTER 50KA×2 SLIDE VR 45mm L=20 FADER 100KB×2 ROTARY VR 16f L=20 MIC-TONE 20KA C.C ROTARY VR 16f L=20 MIC VOL 250KA Part # 092-078 161-117 081-004 082-019 082-022 082-028 083-069 072-035 072-081 071-135 071-102

Parts Lists - PCB 3, 5
ICs
Item # Designators 1 2 3 4 5 6 IC7, IC10, IC15 IC14 IC11 IC8, 9, 12, 13 IC17 IC16 INTEGRATED INTEGRATED INTEGRATED INTEGRATED INTEGRATED INTEGRATED Description CIRCUIT CIRCUIT CIRCUIT CIRCUIT CIRCUIT CIRCUIT NJM4558LD NJM4556L NJM2068LD LB1403N NJM7812FA NJM7912FA Part # 074-104 074-113 074-145 074-022 074-107 074-114

Transistors
Item # 1 2 Designators Q1-4 Q5 Description TRANSISTOR 2SC2878 TRANSISTOR 2SA1048 (2SA1317) Part # 076-095 076-104

Diodes
Item # 1 2 3 4 5 Designators D26-30 D32-33 D6-17, D18-D21 D22-25, D31 Description RECTIFIER DIODE 1N4002 (1N4003,1N4004) SILICON DIODE 1N4148 LIGHT EMITTING DIODE (GREEN) 3.15f LIGHT EMITTING DIODE (YELLOW) 3.15f LIGHT EMITTING DIODE (RED) 3.15f Part # 079-027 079-003 080-104 080-103 080-091

Electrical Parts
Item # 1 2 3 4 5 6 Designators J13 J10-12 VR12 VR10 VR8-9 VR11, 13 Description PHONE JACK 6.3f 2P RCA JACK P=14mm SLIDE VR 45mm L=20 CH VOL MASTER 50KA×2 SLIDE VR 30mm L=15 CUE FADER 20KB×2 ROTARY VR 16f L=20 CH-TONE 20KW×2 CC ROTARY VR 16f L=20 BOOTH CUE VOL 50KA×2 Part # 092-078 161-117 072-035 072-092 071-104 071-084

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PCB 1, 2, 4 - Schematic
SW1D

MIC XLR
X14 2 XLR1 XLR 3 X2 VR3 -12 +12 R15 47 R16 47 R2 4K7 250KA R3 50K C4 124 IC1A T R S C14 22/16 R10 1K 1% 4558LD C15 R13 101 30K1 1% C6 47/16 22/16 C16 47/16 R1 684 680 C5 VR2 20KA C3 R3A 820 VR1 20KA C2 123 R4 6K8 4558LD IC1B C8 4.7P

SW03*4

+ G

R7 30K1 1% C12 C11 22/16 J1 R8 1K 1% 101

1

C13 22/16 +12 R17 4K7

MIC

C1 124

SW1C

D1 LED

-12

X1 SW2A

X4 C34 47/16 R41 180 R35 8K2 C31 822 R32 100K C28 273 IC3A R31 J3 L G R R43 47K R44 1K C35 47/16 C30 822 R36 8K2 C33 273 R45 100K C22 101 C25 101 C32 56 IC3B 2068LD R34 47K 1K C29 56 C36 47/16 2068LD

-12 +12 SW1A R47 47 R48 47 R11 R29 1K8 C26 10/16 R20 36K C37 47/16 SW3A R21 36K SW6B SW1B R40 1K8 R46 180 J2 R14 1K8 C27 SW3C 10/16 R6 18K R12 100K C19 SW3B VR4B 10/16 C24 SW3D 10/16 -12 R63 R59 100K C46 273 IC4A R56 J5 R60 47K 1K C43 56 C52 47/16 C53 47/16 VR5A R61 47K R64 1K C51 47/16 C47 822 R62 8K2 C49 56 IC4B 2068LD R66 1K8 R68 180 J4 R49 1K8 C50 R1 273 R67 100K C39 101 C41 101 C38 SW7B VR5B 10/16 C40 SW7D 10/16 -12 R85 R83 100K C62 273 IC5A R79 J7 R80 47K 1K C59 56 C68 47/16 C70 47/16 VR6A R87 47K R84 1K C67 47/16 C63 822 R86 8K2 C65 56 IC5B 2068LD R89 1K8 R91 180 J6 R69 1K8 C66 273 R90 100K C55 101 C56 101 C54 SW10B VR6B 10/16 C57 SW10D 10/16 R77 36K R78 36K SW11A D4 LED R82 24K 50KAX2 R3 R39 24K C60 SW10C 10/16 SW10A R75 36K SW11B R74 36K R73 24K 50KAX2 L3 R25 24K 2068LD R81 1K8 C58 10/16 +12 R94 47 R95 47 R65 4K7 R3 SW4B R2 47/16 822 +12 R1 SW-05WAY*2 R54 36K R55 36K SW9A D3 LED R57 24K 50KAX2 L1 R4 SW-05WAY*2 R2 R37 24K L3 SW4A L2 L4 SW-05WAY*2 C45 SW7C 10/16 SW7A R52 36K SW9B R2 R51 36K R50 24K 50KAX2 R3 SW13B L2 R23 24K R4 L1 SW-05WAY*2 2068LD R58 1K8 C42 L3 10/16 L2 SW13A +12 R71 47 R72 47 +12 L4 R42 4K7 R27 36K R28 36K SW6A D2 LED R30 24K 50KAX2 R1 R33 24K C23 IC2A 10/16 2068LD C7 22/16 22/16 C9 22/16 C10 C21 22 -12 +12 R9 10 R18 10 SW03*4 VR4A R22 24K 50KAX2 L1 R19 24K C20 10/16 22/16 2068LD 100K C18 22 IC2B C17 X10 SW03*4

R5 18K

SW2B

PH1/LN2

LN1
R26 1K8

X3 SW5A

X6

R70 180 SW5B

C44 47/16

8K2 C48 822

PH2/LN4

X-FADER

LN3
R53 1K8

X5 SW8A

X7

R92 SW8B 180

C61

8K2 C64

PH3/LN6

LN5
R76 1K8

R88 4K7

+12

J8 R93 1K8 C69 101 C71 101

C72 SW12A 10/16 C73 SW12B 10/16 R99 36K SW14B R100 36K VR7A R97 24K 50KAX2 L4 R24 24K

LN7
R98 1K8

J9 R101 1K8 C74 101 C83 101

C75 SW12C 10/16 R102 36K C78 SW12D 10/16 R103 36K SW14A D5 LED VR7B R96 24K 50KAX2 R4 R38 24K

LN8
R106 1K8

R105 4K7 R109 +12 68K -12 +12 R104 10 R107 10 56 IC6A 100/16 2068LD C76 22/16 100/16 C77 22/16 -12 +12 X12 C82

C81 C79

IC6B C84 100/16 2068LD C80 56 R108 68K C85 100/16

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PCB 3, 5 - Schematic

R143 2K

R136 10K

C86 L 10/16 G C87 R 10/16

J10

R135 2K

R140 10K

R112 4K7

VR9A 20KWX2 C96 104 R115 10K

R118 4K7 C93 104 C98 56 C108 R146 2K VR12A IC7A 4558LD 10/16 C120 2068LD 10/16 R150 100K R151 820 C116 56 R142 9K1 IC11B ML R111 300 C89 22/16 50KAX2 R144 10 A3 J11 R122 -12 C103 R148 56 C112 820 C115 56 R141 9K1 VR12B C119 2068LD 10/16 R149 100K C106 22/16 B3 C111 22/16 Q1 2SC2878 -12 R185 820 C132 56 R179 9K1 VR13B C140 300 4558 10/16 50KAX2 R184 100K C127 22/16 C126 22/16 Q4 2SC2878 22/16 IC15A R186 C138 +12 R169 10 R170 10 IC11A MR R113 300 C99 22/16 50KAX2 R127 150 R123 47K R110 3K R132 10 R137 10 +12 -12 +12 C109 22/16 R145 10 C110 22/16 Q2 2SC2878 R120 150 R117 47K

X11 R114 4K7

VR8A 20KWX2 A1

C91 222

VR9B 20KWX2 R119 4K7 C95 104 R121 10K 4K7 C94 104

A2

R147 2K

R116 4K7

IC7B 4558LD

10/16

C92 222

B1 VR8B 20KWX2

B2

R167 150 R163 47K J12

R182 820 R168 +MET R171 27 D6 D8 D10 D12 D14 10 R172 27 10/16 50KAX2 D16 D18 D20 D22 D24 R183 100K VR13A C139

C131 56 R178 9K1 IC15B 4558 R177 300 Q3 2SC2878 C135 22/16 R159 150 R160 47K R190 3K

+12

LED 1 2

LED 3

LED 4

LED 6

LED 9 1 IC8

LED 2

LED 3

LED 4

LED 6

LED 9 IC13 -12 R187 1M Q5 2SA1317 R192 1K C148 4,7/16 LB1403N R164 160K ML C88 4.7/16 R126 51K -12 +12 R133 10 R138 10 D32 1N4148 220/16 C147 R193 560K D33 1N4148

7

5

8

7

5 R155 10K

C97 R125 10K 10/16 R129 100K

R130 120K

C118 10/16

8 R161 8K2

LB1403N

+12

R165 10 R173 27 D7 D9 D11 D13 D15 R174 27 D17 D19 D21 D23 D25 R153 51K C102 IC10A 22/16 4558 C105 22/16 LED 1 2 LED 3 LED 4 LED 6 LED 9 1 IC9 LED 2 LED 3 LED 4 LED 6 LED IC12 R134 51K C100 22/16 4558 MR C101 10/16 R124 10K R128 100K R131 120K R139 C121 10/16 R152 10K R156 8K2 160K 4.7/16 C90 C113 56 IC10B 9 C104 56

C117 22/16

R154 51K 7 5 8 7 5 8 LB1403N LB1403N

C133 470/16 D30

+MET

1N4002 R191 4K7 D31

X9
1 2

LED

C145 103 IC16 7812 D29 1N4002 D28 1N4002 C134 470/25 C142 470/25 +12 C149 1/16

3 4 5 C129 56 R162 C114 VR11B 10/16 VR10A X13 20KBX2 4.7/16 50KA R158 4556 100K C122 2K7 C125 22/16 R176 36K IC14B R181 47 C137 222 C141 103 C130 470/25 D27 1N4002 D26 1N4002

C146 470/25

C150 1/16

-12 IC17 7912

-12 X8 +12 T R S J13 X15

-12 R166 VR10B 20KBX2 2K7 C124 22/16 R175 C107 VR11A 10/16 C123 4556 4.7/16 50KA R157 100K C143 470/16 C144 470/16 36K IC14A R180 47 C128 56 +12 R188 10 R189 10 PLUG03 SOCKET03

C136 222

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