Gemini PDM-10 User manual

Page1
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)

Page2
1
2
3
4
5
6
7
8
9
15
10
11
20
17
18
13
23
16
14
25
28
24
27
18
18 18
19
21
22
12
26

Page3
30 30
29
31 31 32 32 33 33 34 34 35 35 37 37 38 38 40 40 41 41
46 36 45 39 42
4343 44

Page4
Connections
1. Before plugging in the power cord, make sure that the VOLTAGE
SELECTOR (29) switch is set to the correct voltage.
NOTENOTE
NOTENOTE
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
additionalamplifier.
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.
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:DONOTTERMINATETHEACGROUNDONTHEPOWER
MIXERINANYWAY.TERMINATIONOFTHEAC GROUNDCAN 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.
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. CROSSFADERSECTION:The CROSSFADER (16)allowsthemixing
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 theoutside FADER PLATESCREWS(B).Do not
touchthe INSIDESCREWS(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.
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
NOTENOTE
NOTE: 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 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.

Page5
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
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
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
Description Part #
Cabinet Parts and Packing
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
Item #
Parts Lists
262-039
262-040
262-041
262-042
262-043
PRINTED CIRCUIT BOARD PDM10-1:
SWITCH (V0 12×146)
PRINTED CIRCUIT BOARD PDM10-2:
MAIN
PRINTED CIRCUIT BOARD PDM10-3:
MASTER VR
PRINTED CIRCUIT BOARD PDM10-4:
FADER (V0 73.5×13)
PRINTED CIRCUIT BOARD PDM10-5:
PHONES (V0 14.5×27)
Description Part #
Printed Circuit Boards
Item #
1
2
3
4
5

Page6
Parts Lists - PCB 1, 2, 4
092-078
161-117
081-004
082-019
082-022
082-028
083-069
072-035
072-081
071-135
071-102
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
J1
J2-9
SW2, 5, 8
SW3, 7, 10, 12
SW1
SW4, 13
SW6, 9, 11, 14
VR4-7
X-FADER
VR1-2
VR3
Designators Description Part #
Electrical Parts
Item #
1
2
3
4
5
6
7
8
9
10
11
074-104
074-145
INTEGRATED CIRCUIT NJM4558LD
INTEGRATED CIRCUIT NJM2068LD
IC1
IC2-6
Designators Description Part #
ICs
Item #
1
2
Parts Lists - PCB 3, 5
076-095
076-104
TRANSISTOR 2SC2878
TRANSISTOR 2SA1048 (2SA1317)
Designators Description Part #
Transistors
Item #
1
2
079-027
079-003
080-104
080-103
080-091
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
D26-30
D32-33
D6-17,
D18-D21
D22-25, D31
Designators Description Part #
Diodes
Item #
1
2
3
4
5
092-078
161-117
072-035
072-092
071-104
071-084
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
J13
J10-12
VR12
VR10
VR8-9
VR11, 13
Designators Description Part #
Electrical Parts
Item #
1
2
3
4
5
6
074-104
074-113
074-145
074-022
074-107
074-114
INTEGRATED CIRCUIT NJM4558LD
INTEGRATED CIRCUIT NJM4556L
INTEGRATED CIRCUIT NJM2068LD
INTEGRATED CIRCUIT LB1403N
INTEGRATED CIRCUIT NJM7812FA
INTEGRATED CIRCUIT NJM7912FA
IC7, IC10, IC15
IC14
IC11
IC8, 9, 12, 13
IC17
IC16
Designators Description Part #
ICs
Item #
1
2
3
4
5
6
Q1-4
Q5
080-091LIGHT EMITTING DIODE (RED) 3.15fD1-5
Designators Description Part #
Diodes
Item #
1

+12
-12
IC3A
2068LD
IC3B
2068LD
R32
100K R47
47 R48
47
R35
8K2
R41
180
R34
47K
R36
8K2
R43
47K
R46
180 R45
100K
C31
822
C29
56
C28
273
C32
56
C33
273
C30
822
C36
47/16
C35
47/16
C37
47/16
C34
47/16
R31
1K
R44
1K
R14
1K8
R26
1K8
C22
101
C25
101
C26
10/16
C19
10/16
C27
10/16
C24
10/16
+12
-12
IC4A
2068LD
IC4B2068LD
R59
100K R71
47 R72
47
R63
8K2
R70 180
R60
47K
R62
8K2
R61
47K
R68
180 R67
100K
C48
822
C43
56
C46
273
C49
56
C50
273
C47
822
C52
47/16
C51
47/16
C53
47/16
C44
47/16
R56
1K
R64
1K
R49
1K8
R53
1K8
C39
101
C41
101
C42
10/16
C38
10/16
C45
10/16
C40
10/16
+12
-12
IC5A
2068LD
IC5B2068LD
R83
100K R94
47 R95
47
R85
8K2
R92
180
R80
47K
R86
8K2
R87
47K
R91
180 R90
100K
C64
822
C59
56
C62
273
C65
56
C66
273
C63
822
C68
47/16
C67
47/16
C70
47/16
C61
47/16
R79
1K
R84
1K
R69
1K8
R76
1K8
C55
101
C56
101
C58
10/16
C54
10/16
C60
10/16
C57
10/16
R29
1K8
R40
1K8
R66
1K8
R58
1K8
R81
1K8
R89
1K8
R93
1K8
R98
1K8
C69
101
C71
101
C72
10/16
C73
10/16
R101
1K8
R106
1K8
C74
101
C83
101
C75
10/16
C78
10/16
L
R
G
J3
J2
J5
J4
J7
J6
J8
J9
VR5A
50KAX2
VR5B
50KAX2
R37
24K
R23
24K
R33
24K
R19
24K
C23
10/16
SW3A
SW3C
SW3D
SW3B
R20
36K
R42
4K7
R27
36K
R28
36K D2
LED
+12
VR4A
50KAX2
VR4B
50KAX2
R21
36K
SW6A
SW6B
SW12A
SW12B
SW12C
SW12D
R57
24K
R50
24K
R30
24K
R22
24K
VR6A
50KAX2
C20
10/16
R51
36K
R65
4K7
R54
36K
R55
36K D3
LED
+12
R52
36K
SW9A
SW9B
VR6B
50KAX2
VR7A
50KAX2
R39
24K
R25
24K
R82
24K
R73
24K
R74
36K
R88
4K7
R77
36K
R78
36K D4
LED
+12
R75
36K
SW11A
SW11B
VR7B
50KAX2
R38
24K
R24
24K
R96
24K
R97
24K
R100
36K
R105
4K7
R102
36K
R103
36K D5
LED
+12
R99
36K
SW14A
SW14B
L1
R1
L2
R2
L3
R3
L4
R4
X4
X6
X7
SW7A
SW7C
SW7D
SW7B
SW10A
SW10C
SW10D
SW10B
IC1A
4558LD
IC1B
4558LD
R15
47 R16
47
R7
30K1 1%
C12
101
C15
101 C16
47/16
C6
47/16
C11
22/16
C14
22/16
C5
22/16
R8
1K 1%
R10
1K 1%
R13
30K1 1%
T
R
S
J1
-12 +12
VR1
20KA
VR2
20KA
C4
124
C3
684
C2
123
C1
124
R2
4K7
R1
680
R4
6K8
VR3
250KA
C8
4.7P
SW1C
SW1D
SW03*4
R17
4K7
D1
LED
+12
-12
SW13A
SW-05WAY*2
SW13B
SW-05WAY*2
SW4A
SW-05WAY*2
SW4B
SW-05WAY*2
L1
L2
L3
L4
R4
R3
R2
R1
L4
L3
L2
L1
R4
R3
R2
R1
R12
100K
R18
10
R9
10
C21 22
C10
22/16
C7
22/16 C9
22/16
-12 +12
R6
18K
R11
100K
C18 22
C17
22/16
R5
18K
SW1B
SW03*4
SW1A
SW03*4
IC2A
2068LD
IC2B
2068LD
R109
68K
R107
10
R104
10
C81 56
C76
22/16 C77
22/16
-12 +12
C79
100/16
C84
100/16
C80 56
R108
68K
C82
100/16
C85
100/16
IC6A
2068LD
IC6B
2068LD
C13
22/16
SW2A
SW2B
X1
SW5A
SW5B
X3
SW8A
SW8B
X5
X-FADER
LN1
PH1/LN2
LN3
PH2/LN4
LN5
PH3/LN6
LN7
LN8
MIC
MIC XLR
X12
-12
+12
X10
X2
+2
G
1
-3
XLR1
XLR
X14
R3
50K
R3A
820
Page 8
PCB 1, 2, 4 - Schematic

J12
J11
R150
100K
R142
9K1
R151
820
C120
10/16
C106
22/16 C111 22/16
C116
56
R132
10 R137
10
+12
-12
VR12A
50KAX2
R115
10K
R118
4K7
R114
4K7
R112
4K7
R145
10
R144
10
C98
56
C96
104 C93 104
C91
222
VR9A
20KWX2
VR9B
20KWX2
IC7A
4558LD
C109
22/16 C110 22/16
+12
-12
C108
10/16
R121
10K
R122
4K7
R116
4K7
R119
4K7 C103
56
C95
104 C94 104
C92
222
A1
A2
A3
VR8A
20KWX2
B1
B2
B3
VR8B
20KWX2
IC7B
4558LD
C112
10/16
R146
2K
R147
2K VR12B
50KAX2 R149
100K
R141
9K1
R148
820
C119
10/16
C115
56
VR13B
50KAX2
IC15A
4558
R184
100K
R179
9K1
R185
820
C140
10/16
C127
22/16 C126 22/16
C132
56 R169
10 R170
10
+12
-12
VR13A
50KAX2
IC15B
4558
R183
100K
R178
9K1
R182
820
C139
10/16
C131
56
R143
2K
R135
2K
1 9 2 6 3 4
7 8 5
IC8
LB1403N
1 9 2 6 3 4
7 8 5
IC13
LB1403N
1 9 2 6 3 4
7 8 5
IC9
LB1403N
1 9 2 6 3 4
7 8 5
IC12
LB1403N
D6
LED
D8
LED
D10
LED
D12
LED
D14
LED
D16
LED
D18
LED
D20
LED
D22
LED
D24
LED
D7
LED
D9
LED
D11
LED
D13
LED
D15
LED
D17
LED
D19
LED
D21
LED
D23
LED
D25
LED
R125
10K R129 100K
R130
120K R164 160K
R155
10K R161 8K2
R124
10K R128 100K
R131
120K R139
160K
R152
10K R156
8K2
C97
10/16 C88
4.7/16
C118
10/16
C101
10/16
C90
4.7/16
C121
10/16
R168
10
+12
R171
27 R172 27
R173
27 R174 27
C89
22/16
R111
300 R120
150
R117
47K
L
R
G
J10
C86
10/16
C87
10/16
R136
10K
R140
10K
R126
51K
R138
10
R133
10
IC10A
4558
C104 56
C105
22/16 C117
22/16
-12 +12
C102
22/16
R153
51K
R134
51K
IC10B
4558
C113 56C100
22/16
R154
51K
VR10B
20KBX2
VR10A
20KBX2
VR11A
50KA
VR11B
50KA
IC14A
4556
IC14B
4556
R157
100K
R158
100K
R166
2K7
R176
36K
R162
2K7
C123
4.7/16
C122
4.7/16
C143
470/16 C144 470/16
C128
56
C129
56
R188
10 R189
10
+12
-12
C124
22/16 R175
36K
R180
47
R181
47
C136
222
C137
222
X8
PLUG03
C107
10/16
C114
10/16
Q2
2SC2878
Q5
2SA1317
D32
1N4148
R193
560K
D33
1N4148
C147
220/16
C148
4,7/16
+12
R192
1K
C99
22/16
R113
300 R127
150
R123
47K
Q1
2SC2878
R110
3K
C138
22/16
R186
300 R167
150
R163
47K
Q4
2SC2878
C135
22/16
R177
300
R159
150
R160
47K
Q3
2SC2878 R190
3K
ML
MR
MR
ML
IC11B
2068LD
IC11A
2068LD
C125
22/16
C142
470/25
C146
470/25
C145
103
C149
1/16
C150
1/16
-12
1
2
3
4
5
X9
D29
1N4002
D27
1N4002 D26 1N4002
D28
1N4002
C141
103
D30
1N4002
IC16
7812
IC17
7912
C133
470/16
+MET
+12
D31
LED
R191
4K7
+MET
R165
10
C134
470/25
C130
470/25
R187
1M
-12
X13
-12
+12
X11
X15
SOCKET03
T
R
S
J13
Page 9
PCB 3, 5 - Schematic