Page 1
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)
Page 1
Page 2
25
27
26
28
23
19
20
18
13
18
11
14
12
21
24
22
17
16
18
9
18
7
1
2
10
8
6
3
4
15
5
Page 2
Page 3
44
4343
42
39
45
36
46
29
31 31 32 32 33 33 34 34 35 35 37 37 38 38 40 40 41 41
30 30
Page 3
Page 4
Connections
1. Before plugging in the power cord, make sure that the VOLTAGE
SELECTOR (29) switch is set to the correct voltage.
NOTENOTE
NOTE: This product is double insulated and not intended
NOTENOTE
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.
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.
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.
NOTENOTE
NOTE: The
NOTENOTE
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.
RECORD OUT (32) RECORD OUT (32)
RECORD OUT (32) has no level control.
RECORD OUT (32) RECORD OUT (32)
Page 4
Page 5
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.
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
Parts Lists
Cabinet Parts and Packing
Item #
PANEL CONTROL
1
PANEL REAR
2
COVER BOTTOM
4
BRACKET VR
5
HOLDER X-FADER
6
PROTECTOR PLATE FOR 115/230V SWITCH
7
SWING LEVEL
8
KNOB PUSH (SMALL)
9
BUSHING FOR KNOB (SMALL)
10
KNOB SLIDE (SMALL)
11
KNOB SLIDE (BIG)
12
KNOB ROTARY (ASSIGN)
13
KNOB ROTARY (B)
14
KNOB INLAY (BLACK); LEVEL,BALANCE,CUE
15
KNOB INLAY (GRAY); TREBLE,BASS
16
TRIM VR
17
HOLDER LED 3f LED(17mm)
18
WASHER XLR
19
PAD FOOT
20
DUST PROOF CLOTH (VR)
21
DUST PROOF CLOTH (KNOB-SWING)
22
DUST PROOF CLOTH (VR)
23
GND SCREW
24
PAN-HEAD MACHINE SCREW; PMS 2X4(B)
25
PAN-HEAD MACHINE SCREW; PMS 2.6X4(B)
26
BAND-HEAD TAPPING SCREW/TWIN SCREW;
27
BTS-2 3X8(AB) TWIN
FLAT-HEAD TAPPING SCREW; FTS-3 3X6(AB)
28
BAND-HEAD TAPPING SCREW; BTS-3 3X10(AB)
29
BAND-HEAD TAPPING SCREW; BTS-3 3X6(AB)
30
FLAT-HEAD TAPPING SCREW; FTS-3 3X12(AB)
31
FLAT-HEAD TAPPING SCREW; FTS-3 3X12(Y)
32
BAND-HEAD TAPPING SCREW; BTS-3 3X5(AB)
33
BAND-HEAD TAPPING SCREW/TW-E; BTS-3/
34
TW-E 3X6(AB)
NUT/WASHER 3mm
35
Item #
PRINTED CIRCUIT BOARD PDM10-1:
1
SWITCH (V0 12×146)
PRINTED CIRCUIT BOARD PDM10-2:
2
MAIN
PRINTED CIRCUIT BOARD PDM10-3:
3
MASTER VR
PRINTED CIRCUIT BOARD PDM10-4:
4
FADER (V0 73.5×13)
PRINTED CIRCUIT BOARD PDM10-5:
5
PHONES (V0 14.5×27)
Description
Printed Circuit Boards
Description Part #
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
262-039
262-040
262-041
262-042
262-043
Page 5
Page 6
Parts Lists - PCB 1, 2, 4
Designators Description Part #
Item #
1
IC1
2
IC2-6
Item #
1
Item #
1
J1
2
J2-9
3
SW2, 5, 8
4
SW3, 7, 10, 12
5
SW1
6
SW4, 13
7
SW6, 9, 11, 14
8
VR4-7
9
X-FADER
10
VR1-2
11
VR3
ICs
INTEGRATED CIRCUIT NJM4558LD
INTEGRATED CIRCUIT NJM2068LD
074-104
074-145
Diodes
Designators
Description Part #
080-091LIGHT EMITTING DIODE (RED) 3.15fD1-5
Electrical Parts
Designators Description Part #
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
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
Item #
1
2
3
4
5
6
Item #
1
2
Item #
1
2
3
4
5
Item #
1
2
3
4
5
6
ICs
Designators Description Part #
IC7, IC10, IC15
IC14
IC11
IC8, 9, 12, 13
IC17
IC16
INTEGRATED CIRCUIT NJM4558LD
INTEGRATED CIRCUIT NJM4556L
INTEGRATED CIRCUIT NJM2068LD
INTEGRATED CIRCUIT LB1403N
INTEGRATED CIRCUIT NJM7812FA
INTEGRATED CIRCUIT NJM7912FA
074-104
074-113
074-145
074-022
074-107
074-114
Transistors
Designators Description Part #
Q1-4
Q5
TRANSISTOR 2SC2878
TRANSISTOR 2SA1048 (2SA1317)
076-095
076-104
Diodes
Designators
D26-30
D32-33
D6-17,
D18-D21
D22-25, D31
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
Description Part #
079-027
079-003
080-104
080-103
080-091
Electrical Parts
Designators Description Part #
J13
J10-12
VR12
VR10
VR8-9
VR11, 13
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
092-078
161-117
072-035
072-092
071-104
071-084
Page 6
Page 7
Page 8
Page 9
PCB 1, 2, 4 - Schematic
SW2A
SW2B
SW5A
SW5B
SW8A
SW8B
MIC XLR
2
1
PH1/LN2
PH2/LN4
LN3
PH3/LN6
SW1D
X2
X14
XLR1
XLR
+
3
-
G
J1
T
R
S
MIC
X4
X1
LN1
X3
X5
LN5
LN7
LN8
C34
R41
180
47/16
J3
J2
X6
J5
J4
X7
J7
J6
J8
J9
R34
L
47K
G
R43
R
47K
C35
47/16
R46
180
R14
1K8
R26
1K8
C44
180
R70
47/16
R60
47K
R61
47K
C51
47/16
R68
180
R49
1K8
R53
1K8
C61
R92
180
47/16
R80
47K
R87
47K
C67
47/16
R91
180
R69
1K8
R76
1K8
R93
1K8
R98
1K8
R101
1K8
R106
1K8
C11
R8
1K 1%
22/16
C14
R10
1K 1%
22/16
-12
+12
R32
R35
8K2
R31
1K
C29
56
C32
56
R44
1K
R36
8K2
R63
8K2
R56
1K
C43
56
C49
56
R64
1K
R62
8K2
R85
8K2
R79
1K
C59
56
C65
56
R84
1K
R86
8K2
R47
100K
47
2068LD
IC3B
2068LD
R45
100K
C22
101
C25
101
R59
100K
2068LD
IC4B
R67
100K
C39
101
C41
101
R83
100K
2068LD
IC5B
R90
100K
C55
101
C56
101
C69
101
C71
101
C74
101
C83
101
R48
C28
47
273
IC3A
R29
1K8
C36
C37
47/16
47/16
C27
R40
1K8
10/16
C33
273
C19
10/16
C24
10/16
-12
+12
R71
R72
C46
47
47
273
IC4A
R58
1K8
C52
C53
47/16
47/16
C45
2068LD
R66
1K8
10/16
C50
273
C38
10/16
C40
10/16
-12
+12
R94
R95
C62
47
47
273
IC5A
R81
1K8
C68
C70
47/16
47/16
C60
2068LD
R89
1K8
10/16
C66
273
C54
10/16
C57
10/16
C72
10/16
C73
10/16
C75
10/16
C78
10/16
C31
822
C30
822
C48
822
C47
822
C64
822
C63
822
-12
R7
+12
30K1 1%
R15
C12
47
101
IC1A
4558LD
R13
C15
C6
30K1 1%
101
47/16
C26
10/16
C42
10/16
C58
10/16
R2
R3
4K7
R16
47
VR2
C5
20KA
22/16
R1
C16
680
47/16
SW3A
SW3C
SW3B
SW3D
SW7A
SW7C
SW7B
SW7D
SW10A
SW10C
SW10B
SW10D
SW12A
SW12B
SW12C
SW12D
C2
123
50K
C4
124
C3
684
R4
6K8
VR1
20KA
R3A
820
C1
124
R20
36K
R21
36K
SW6B
R27
36K
R28
36K
SW6A
R51
36K
R52
36K
SW9B
R54
36K
R55
36K
SW9A
R74
36K
R75
36K
SW11B
R77
36K
R78
36K
SW11A
R100
36K
R99
36K
SW14B
R102
36K
R103
36K
SW14A
SW03*4
VR3
250KA
C8
4.7P
C13
22/16
4558LD
IC1B
+12
R17
4K7
D1
LED
SW1C
-12
SW1A
SW03*4
R5
18K
R11
C82
100/16
C85
100/16
100K
C18 22
R6
18K
R12
100K
C21 22
L4
L3
L2
L1
R4
R3
R2
R1
L4
L3
L2
L1
R4
R3
R2
R1
SW03*4
IC2A
2068LD
IC2B
2068LD
SW1B
C7
22/16
C17
22/16
-12
+12
R9
10
SW13A
SW-05WAY*2
SW13B
SW-05WAY*2
SW4A
SW-05WAY*2
SW4B
SW-05WAY*2
X10
R18
10
C10
22/16
C9
22/16
X-FADER
X12
-12
+12
C20
10/16
C23
10/16
VR4A
50KAX2
VR4B
50KAX2
D2
LED
R42
4K7
+12
VR5A
50KAX2
VR5B
50KAX2
D3
LED
R65
4K7
+12
VR6A
50KAX2
VR6B
50KAX2
D4
LED
R88
4K7
+12
VR7A
50KAX2
VR7B
50KAX2
D5
LED
R105
4K7
+12
R22
24K
R30
24K
R50
24K
R57
24K
R73
24K
R82
24K
R97
24K
R96
24K
C79
100/16
C84
100/16
L1
R1
L2
R2
L3
R3
R4
L4
R109
68K
C81 56
2068LD
C80 56
R108
68K
IC6A
2068LD
IC6B
R19
24K
R33
24K
R23
24K
R37
24K
R25
24K
R39
24K
R24
24K
R38
24K
-12
+12
R104
10
R107
10
C76
C77
22/16
22/16
Page 8
Page 10
PCB 3, 5 - Schematic
X11
+12
+MET
R171
27
D6
LEDD8LED
19263
C97
10/16
R173
27
D7
LEDD9LED
19263
C101
10/16
R168
10
785
785
J10
R143
2K
R135
VR9A
R118
R112
20KWX2
4K7
4K7
C96
C93
104
R115
10K
R114
4K7
C91
222
VR8A
20KWX2
A1A2A3
VR9B
20KWX2
R119
4K7
C95
104
R121
10K
R116
4K7
C92
222
B1B2B3
VR8B
20KWX2
R172
D10
D12
D14
LED
LED
LED
4
LB1403N
R125
R129
10K
100K
R165
10
D11
D13
D15
LED
LED
LED
4
LB1403N
R124
R128
10K
100K
27
D16
D18
D20
LED
LED
LED
19263
IC8
C118
10/16
R174
27
D17
LED
19263
C121
10/16
785
R155
10K
D19
D21
LED
LED
785
R152
10K
R130
120K
IC9
R131
120K
C98
104
56
IC7A
4558LD
C109
R144
22/16
10
-12
R122
4K7
C94
C103
104
56
IC7B
4558LD
D22
D24
LED
LED
4
IC13
LB1403N
R164
ML
160K
R161
8K2
D23
LED
4
R156
160K
8K2
D25
LED
LB1403N
R139
C88
4.7/16
IC12
MR
C90
4.7/16
2K
C116
R151
820
56
R142
C108
R146
2K
10/16
C110
R145
22/16
10
+12
C112
R147
2K
10/16
VR12A
50KAX2
VR12B
50KAX2
VR13B
50KAX2
VR13A
50KAX2
9K1
IC11B
C120
2068LD
R150
10/16
100K
-12
R132
C115
R148
820
C119
10/16
R185
820
C140
10/16
R182
820
C139
10/16
C102
R153
51K
22/16
R154
51K
22/16
10
56
R141
9K1
IC11A
2068LD
R149
100K
C106
22/16
-12
C132
R169
56
10
R179
9K1
IC15A
4558
R184
100K
C127
22/16
C131
56
R178
9K1
IC15B
4558
R183
100K
-12
R126
51K
C104 56
IC10A
4558
C105
22/16
R134
51K
C113 56C100
IC10B
4558
C86
R136
L
10K
10/16
G
C87
R140
R
10K
10/16
C89
R111
ML
300
Q2
2SC2878
+12
R137
10
R113
MR
300
C111
22/16
+12
R170
10
R186
300
C126
22/16
R177
300
Q3
2SC2878
+12
R133
R138
10
10
C117
22/16
R120
22/16
150
R117
47K
J11
C99
R127
22/16
150
R123
47K
R110
3K
Q1
2SC2878
C138
R167
150
22/16
R163
Q4
47K
2SC2878
R187
-12
1M
J12
C135
R159
150
22/16
R160
47K
R190
3K
C148
4,7/16
R192
Q5
1K
2SA1317
D33
1N4148
R193
560K
D32
1N4148
220/16
C147
+12
C133
+MET
470/16
D30
1N4002
R191
4K7
D31
C145
X9
1
2
3
4
C129
56
C125
R176
R162
C114
VR11B
VR10A
X13
20KBX2
-12
+12
VR10B
20KBX2
10/16
50KA
C107
VR11A
10/16
50KA
36K
2K7
22/16
IC14B
C122
R158
4.7/16
100K
C124
R166
2K7
22/16
R175
36K
C123
4.7/16
R157
100K
R181
47
4556
C128
56
IC14A
4556
C137
222
X8
X15
-12
+12
R188
R189
10
10
R180
47
C143
C144
470/16
470/16
SOCKET03
PLUG03
C136
222
5
J13
T
R
S
103
LED
D29
D28
1N4002
1N4002
D27
D26
1N4002
1N4002
C141
103
IC16
7812
C142
C134
470/25
470/25
C146
C130
470/25
470/25
IC17
7912
+12
C149
1/16
C150
1/16
-12
Page 9
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