Gemini PMX-1100 User manual

Page 1
SERVICE MANUAL
PMX-1100
Stereo Preamp Mixer
Gemini Sound Products Corp.
120 Clover Place P.O. Box 6928
Edison, NJ 08818-6928
732-738-9003 (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
7911 13
810 12 14
2
3
4
56
18 18
24
22
23
20
21
15
31 32
34 38 35
36
42
39 45
37
43
40
37 41
33
17 19

Page 3
6. Headphones can be plugged into the front panel mounted
HEADPHONE (4) jack.
Operation
1. POWER ON: Once you have made all the equipment connections to
your mixer, press the POWER SWITCH (1). The power will turn on
and 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 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 MIC 2 (33) input. The CHANNEL SLIDE (14) controls the input
level of this channel.
6. CROSSFADER SECTION: The CROSSFADER (2) allows the mixing of
one source from CHANNEL 2 into another source from CHANNEL 3.
The CROSSFADER (2) 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:
Introduction
Congratulations on purchasing the Gemini PMX-1100 mixer. This state-of-
the-art mixer is backed by a three year warranty, excluding crossfader
and channel slides. Prior to use, we suggest that you carefully read all the
instructions.
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 are
NO USER REPLACEABLE PARTS INSIDE. Please refer servicing to a
qualified 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 return
equipment to your dealer.
3. Do not expose this unit to direct sunlight or to a heat source such as a
radiator or stove.
4. This unit should be cleaned only with a damp cloth. Avoid solvents or
other cleaning detergents.
5. When moving this equipment, it should be placed in its original carton
and 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 ANY
CONTROLS OR SWITCHES.
Connections
1. Plug in the 15V AC Adapter (37).
2. Make sure that the POWER (1) switch is in the off position. The
POWER LEDS (17) will be off.
3. The PMX-1100 is supplied with 2 sets of 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.
4. The MIC 1 (3) input (found on the front panel) accepts an XLR
connector, and accepts balanced & unbalanced microphones. The
MIC 2 (33) accepts a 1/4” connector and balanced & unbalanced
microphones.
5. On the rear panel are 3 stereo PHONO/LINE (35, 38, 41) inputs and 4
stereo LINE (34, 37, 40, 41) 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.
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.
7. OUTPUT CONTROL SECTION: The level of the 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.
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) controls MIC 1 and
has three settings. When the MIC/TALKOVER SWITCH (5) is in the
bottom position, the MIC and talkover are off. When the MIC/
TALKOVER SWITCH (5) is in the center position MIC 1 is on, the
MIC INDICATOR (6) will glow, but talkover is off. When the MIC/
TALKOVER SWITCH (5) is in the top position, MIC 1 and talkover
will be on and the volume of all sources except the MIC input are
lowered by 16dB. The MIC LEVEL (15) controls the level of MIC 1.

Page 4
PARTS LIST:
INTEGRATED CIRCUIT NJM2068LD
INTEGRATED CIRCUIT NJM4556L
INTEGRATED CIRCUIT NJM4558LD
(M5218AL,BA4558N)
INTEGRATED CIRCUIT NJM4558DD
INTEGRATED CIRCUIT NJM7812FA
INTEGRATED CIRCUIT NJM7912FA
INTEGRATED CIRCUIT LB1403N (BA6124)
ICs
IC7, IC2, IC6, IC5, IC4
IC15
IC12, IC11, IC8
IC3, IC1
IC16
IC17
IC10, IC14, IC13, IC9
1
2
3
4
5
6
7
074-145
074-113
074-104
074-163
074-107
074-114
074-022
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, D27
D6, D7, D8, D9, D10,
D11, D12, D13, D14,
D15, D16, D17
D1,D2,D3,D4,D5, D22,
D23, D24, D25
D18, D19, D20, D21
1
2
3
4
079-027
080-104
080-091
080-103
Item Designators Description Part #
Item Description Part #
DC JACK 2.5
POWER SWITCH UL
PHONE JACK XLR DJ MIC
Other
1
2
3
092-074
083-099
092-108
Item Description Part #
Mechanical Parts
PANEL CONTROL
PANEL REAR
COVER BOTTOM
SWING LEVEL
KNOB PUSH (SMALL)
BUSHING FOR KNOB (SMALL)
KNOB SLIDE (SMALL)
KNOB SLIDE (BIG)
KNOB ROTARY (A)
KNOB INLAY (SILVER)
TRIMVR
PAD FOOT
GIFT BOX
OWNER’S MANUAL
POLYFORM
POLYFOAM PLATE 140mm×180mm×58mm
WARRANTY CARD
GND SCREW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
FACEPPMX1100
034-124
032-123
023-674
002-531
002-532
002-726
002-724
003-109
148-312
003-736
049-206
255-230
257-016
153-224
153-223
156-089
146-710
LEVER SW 4P2C P=18
PUSH SWITCH 2P2C L=12.5
PHONE JACK 6.3
LEVER SW 4P3C P=24
RAILGLIDE VR 45mm X-FADER 100KB×2
SLIDE VR 30mm L=15 CUE FADER 20KB×2
ROTARY VR 14 (F) L=22.5 CH-TONE 20KW×2 CC
ROTARY VR 11 (F) L=22.5 BOOTH CUE VOL 50KA
ROTARY VR 14 (F) L=22.5 CUE 50KA×2
SLIDE SWITCH 2P2C
SLIDE VR 45mm L=20 CH VOL MASTER 50KA×2
2P RCA JACK P=14
Electrical Parts
SW8, SW6, SW4, SW2
SW9, SW7, SW5, SW3
J11, J1
SW1
X-FADER
VR8
VR7, VR6
VR1
VR9
SW10, SW11, SW12
VR3, VR2, VRV4, VR5, VR10
J2, J3, J4, J5, J6, J7, J8, J9, J10
1
2
3
4
5
6
7
8
9
10
11
12
082-019
083-080
092-078
082-022
072-113
072-092
071-230
071-114
071-166
081-004
072-035
161-160
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 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:
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
224
C85
22/16
C84
22/16
C12
10K
R6
10K
R17
10K
R97
47K
R100
47K
R101
+12
-12
J1
S
R
T
30K1 1%
R12
1K 1%
R15
1K 1%
R9
22/16
C24
22/16
C19
22/16
C11
47/16
C18 47/16
C17
101
C13
101
C14
30K1 1%
R11
10
R1810
R19
4558LD
IC3B
7
5
6
4558LD
IC3A
84
1
3
2
+12
-12
X8 2
1
6K2
R182
6K2
R176
3K6
R171
3K6
R169
2K4
R155
2K4
R144
2K4
R133
2K4
R129
2K4
R124
3K6
R117
6K2
R175
6K2
R170
3K6
R168
3K6
R154
2K4
R146
2K4
R137
2K4
R132
2K4
R128
2K4
R123
R
L
6
5
4
3
2
1
X4
X1
J11
S
R
T
SOCKET03
X10
XLR
XLR1
3
-
1G2
+
X2
MIC XLR
LN7
PH3/LN6
LN5
PH2/LN4
PH1/LN2
MIC
LN3
LN1
X11
SW10B4
6
5
SW10A1
3
2
X12
SW11B4
6
5
SW11A1
3
2
X13
3
2
1
SW12B4
6
5
SW12A
1
3
2
22/16
C15
+12
7912
IC17
7812
IC16
-12
1/16
C125
1/16
C126
103
C135
1000/25
C133
1000/25
C134
1N4002
D26
1N4002
D27
22/16
C124
4558LD
IC12A
84
1
3
2
4558LD
IC12B 7
5
6
ML
MR
MR
ML
47K
R127
330
R131
47/16
C87
10/16
C113
10/16
C106 PLUG03
X7
222
C132
222
C131
56
R188
56
R187
36K
R184
22/16
C123 -12 +12
10
R17710
R186
56
C129
56
C128
470/16
C136
470/16
C127
4.7/16
C121
4.7/16
C120
2K7
R167 36K R185
2K7
R178
100K
R173
100K
R172
4556
IC15B 7
5
6
4556
IC15A
84
1
3
2
50KA
VR9B
50KA
VR9A
A3
A2
A1
20KBX2
VR8A
20KBX2
VR8B
51K
R166
22/16
C98 56C112
4558LD
IC11B
7
5
6
51K
R143
51K
R165
22/16
C100
+12
-12
22/16
C117
22/16
C103
56C102
4558LD
IC11A
84
1
3
2
10
R13910
R152
51K
R134
10K
R147
10K
R145
10/16
C89
10/16
C86 J9
G
R
L
47K
R119
330
R122
47/16
C88
10/16
C130 0.1/16 C116
10/16
C99
10/16
C122
0.1/16
C104
10/16
C96
8K2
R181
10K
R174 160K
R183
120K
R153
100K
R141
10K
R135
8K2
R179
10K
R164 160K
R180
120K
R140
100K
R136
10K
R130
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 8 7
4 3 6 2 9 1
LB1403N
IC10
5 8 7
4 3 6 2 9 1
LB1403N
IC13
5 8 7
4 3 6 2 9 1
LB1403N
IC9
5 8 7
4 3 6 2 9 1
2K
R142
2K
R149
201
C114
10/16
C118
820
R160
9K1 R150
100K
R161
50KAX2
VR10B
2K
R159
2K
R156
10/16
C111
4558LD
IC8B7
5
6
20KWX2
VR6B B3
B2
B1
20KWX2
VR6A
A3
A2
A1
222
C95
104
C92
104
C93
56
C101
4K7
R121
4K7
R118
4K7
R126
10K
R125
10/16
C107
-12 +12
22/16
C109
22/16
C108
4558LD
IC8A
84
1
3
2
20KWX2
VR7B
20KWX2
VR7A A3
A2
A1
222
C90
104
C91
104
C94
56
C97
10
R157 10 R158
4K7
R114
4K7
R115
4K7
R120
10K
R116
50KAX2
VR10A
-12 +12
10
R14810
R138
201
C115
22/16
C110
22/16
C105
10/16
C119
820
R163
9K1
R151
100K
R162
J10
2068LD
IC7B 7 5
6
2068LD
IC7A
84
1
3
2
100/16
C81
100/16
C83
68K
R104 56C74
+12
-12
22/16
C79
22/16
C80
56C75 10
R109
10
R95
68K
R99
2068LD
IC2B
7
5
6
2068LD
IC2A
84
1
3
2
SW03*4
SW1A
SW03*4
SW1B
18K
R7
22/16
C20
33PC21
100K
R13
18K
R8
+12
-12
22/16
C16
22/16
C8
22/16
C10
33PC23 10
R1010
R25
100K
R14
-12
+12
LED
D1
4K7
R16
SW03*4
SW1D
SW1C
15P
C3 50KA
VR1
3
2
1
12K
R4
+12
-12
30K1 1%
R2
1K 1%
R5
1K 1%
R1
22/16
C6
22/16
C5
22/16
C4
47/16
C9 47/16
C7
101
C1
101
C2
30K1 1%
R3
10
R2110
R20
4558LD
IC1B
7
5
6
4558LD
IC1A
84
1
3
2
SW6B
SW6D
SW6C
SW6A
SW4B
SW4D
SW4C
SW4A
X6
X5
X3
SW9B
4 6
5
SW9A
1 3
2
36K
R106
-12
LED
D5
36K
R103
36K
R102
4K7
R111
36K
R105
24K
R112
24K
R113
24K
R107
24K
R98
50KAX2
VR5B
SW7B
4 6
5
SW7A
1 3
2
36K
R76
-12
LED
D4
36K
R80
36K
R79
4K7
R87
36K
R75
24K
R74
24K
R73
24K
R69
24K
R66
50KAX2
VR5A
50KAX2
VR4B
SW5B
4 6
5
SW5A
1 3
2
36K
R48
-12
LED
D3
36K
R51
36K
R50
4K7
R60
36K
R47
10/16
C22
50KAX2
VR4A
47K
R29
47K
R32
24K
R53
24K
R52
SW8D
10
12
11
SW8C
7
98
SW8B
4
65
SW8A
1
32
SW3B
4 6
5
SW3A
1 3
2
36K
R24
50KAX2
VR2B
50KAX2
VR2A
-12
LED
D2
36K
R28
36K
R27
4K7
R38
36K
R23
SW2B
SW2D
SW2C
SW2A
10/16
C25
24K
R61
24K
R63
50KAX2
VR3B
50KAX2
VR3A
J8
J6
J7
J4
J5
J2
J3
G
R
L
10/16
C78
10/16
C76
101
C82
101
C77
1K8
R110
1K8
R108
1K8
R85
1K8
R81
1K8
R54
1K8
R58
1K8
R34
1K8
R30
10/16
C61
10/16
C63
10/16
C58
10/16
C62
101
C60
101
C59
1K8
R78
1K8
R77
1K
R88
1K
R84
47/16
C68
47/16
C70
47/16
C73
47/16
C71
822
C66
273
C69
56
C72
273
C64
56
C65
822
C67
100K
R90
180
R93
47K
R92
8K2
R89
47K
R82
180
R96 8K2
R86
10
R9410
R91
100K
R83
2068LD
IC6B
7
5
6
2068LD
IC6A
84
1
3
2
-12 +12
10/16
C45
10/16
C47
10/16
C42
10/16
C46
101
C44
101
C43
1K8
R49
1K8
R46
1K
R64
1K
R57
47/16
C53
47/16
C54
47/16
C57
47/16
C55
822
C49
273
C52
56
C56
273
C48
56
C51
822
C50
100K
R65
180
R68
47K
R67
8K2
R62
47K
R55
180
R70 8K2
R59
10
R7210
R71
100K
R56
2068LD
IC5B
7
5
6
2068LD
IC5A
84
1
3
2
-12 +12
10/16
C29
10/16
C31
10/16
C27
10/16
C30
101
C28
101
C26
1K8
R26
1K8
R22
1K
R39
1K
R36
47/16
C41
47/16
C38
47/16
C40
47/16
C37
822
C33
273
C36
56
C39
273
C32
56
C35
822
C34
100K
R40
180
R42
47K
R41
8K2
R37
47K
R33
180
R43 8K2 R35
10
R4510
R44
100K
R31
2068LD
IC4B
7
5
6
2068LD
IC4A
84
1
3
2
-12 +12

J10J8
J8
J7J6
J5J4J3J2
C133
C21
C23
R55
C134
VR5
1
VR4
1
X9
R17
R6
X8
C135
D27
D26
SW3 SW5 SW7 SW9
X4
C114
J1
SW12 SW11
C41
C40
R43
R42
C39
R81
R54
R30
C30
R36
C38
C37
R34
R40 R39
C35
R33
R41
C31
C33
R37
C36
R31
C32
R35
C34
IC4
C55
C54
R64
R67
C56
R58
R57
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
R137
R117
R124
D5
D4
D3
D2
R60
R38
VR1
C116
C104
IC9
IC13
VR6
VR7
R129
R145
11
12
C83
R95
R1
C2
C1
R2
C6
IC1
R5
X2
IC3
R19
R18
R16
R8
C20
C22
C16
R14
R13
C106 C132
R185
C129
R109
R167
R183
9
C92
C14
C18
C13
C11
R11
R12
R9
R15 C19
R123
R128
R132
R146
R154
R168 R170
R133
R144
C24
R155
R169
R171
R182
R69
R66
R63
R61
R53
R32
X7
C61
R78
C62
SW2
R160
R165
C5
C4
R7
C68
C63
R84
R77
C59
R88
C72
R92
R21
C15
C7
R141
R143
R166
D25
D24
D23
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D1
IC14
IC10
R179
R89
R86
C67
C66
R150
C128
C115
C102
C101
C97
R126
R121
R120
R118
R111
R87
C70
C71
R20
R94
R72
R71
R45
R44
IC11
IC15
C121
R184
R102
R80 R79
R76 R75
R51
R48 R47
R28 R27
R24
R103
R106
R159
C69
C64
C124
C123
C117
C110
C108
C105
C103
C100
C8
IC6
IC2
R85
R164
R174
R135
R125
C82
C60
R173
R172
R162
R161
R90
R83
C130
C119
C118
C113
C99
C96
C58
R148
R139
R138
R25
R158
R157
SW1
SW4
16
14
13
2
C9
R23
R181
R136
R130
R3
R50
R113 R112
C73
R93
C93
C94
C95
R115
C75
IC7
R99 C74
C79
SW6
C111
R180
C109
21
R153
15
R152
IC12
C107
R147
R149
R156
VR10
1
R176
18
17
3
R116
R91
R114
R134
R178
R151
R119
R122
R110
R108
R104
R163
C65
C91
C90
C131
C77
C25
C122
C89
C86
C98
R96
R82
R140
C120
C3
VR8
VR9
C88
C87
C17
R142
10
C81
C80
C112
4
C28
C26
C29
R22 R26
C27
8
R107
R98
7
6
5
R127 R131
X10
J11
SW10
X11
R52
R73
R74
R10
R105
SW8
R97
C78
C76
R100
R101
1
C84
C12
C85
R29
C10
VR2
1
VR3
1
VR11
X3 X5
X12
X13
C126
IC16
25
22
19
20
24
C125
C127 C136
IC17
23
R177
R186
X6