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SERVICE MANUAL
PMX-350
Professional Mixer
CONTENT'S:
Connections & Operations:.......................................................Page 2-3 Specifications:..............................................................................Page 3 Parts Lists:....................................................................................Page 4 PCBs:.............................................................................................Page 5 Schematics....................................................................................Page 6
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
1 2 4
5
3
8
7 9 16
6
10 11 13 13 12 23 21
21 22 21
13 19 17
24
14 25 18
27
19
20
15
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26
Introduction
Congratulations on purchasing a Gemini model PMX -350 mixer. Thisstate-of-the-art mixer includes the latest features and is backed by a three year warranty, excluding crossfader and channel slides. Prior to use, we suggest that you carefully read all the instructions.
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4. CROSSFADER SECTION: The CROSSFADER (20) allows the mixing of one source into another. The left side of the CROSSFADER is CHANNEL 1 and the right side is CHANNEL 2. The CROSSFADER in your unit is removable and, should the need arise, can be easily replaced. Crossfader units are available in two varieties: part RF-45 (which is identical to the crossfader supplied with this mixer) has a 45 mm travel from side-to-side, while the PSF-45 is equipped with a special "curve" designed for scratch mixing. To install a new crossfader: 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.
Features
· · · · 2 Phono/Line Convertible, 1 Phono, 1 Line and 1 Mic input Gain controls for each channel Removable Crossfader Cue Section
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 USA: If you experience problems with this unit, call 1 (732) 738-9003 for Gemini Customer Service. your dealer. Do not attempt to return this 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 SPRAY CLEANERS OR LUBRICANTS ON CONTROLS OR SWITCHES.
5. 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. When the TALKOVER (11) button is pushed, the TALKOVER INDICATOR (10) will glow and the volume of all sources except MIC are reduced by -16 dB. MIC (17) controls the level of the talkover MIC. 6. CUE SECTION: By connecting a set of headphones (26), you can monitor either Channel 1 or Channel 2. Select Channel 1 by moving the CUE SWITCH (19) to the left. Move to the right for Channel 2. Use the CUE (18) control to adjust the headphone volume without affecting the overall mix. 7. DISPLAY: The DISPLAY (16) indicates the MASTER output left and right levels as controlled by the MASTER LEVEL (27).
Connections
1. Make sure that the POWER (22) switch is in the off position. 2. This unit comes supplied with a 15 volt AC adaptor. Plug the male pin of the adaptor into the rear panel POWER JACK (6). Then plug the adaptor into a proper power source. 3. To connect the mixer to your amplifier, use the MASTER (1) jacks on the rear panel. 4. The unit is equipped with one microphone input. The MIC JACK (15) is a 1/4" (6.35 mm) and is located on the front panel. 5. 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, 9) enable you to set the (3, 4) inputs to Phono or Line. The PHONO (5) input will accept turntable inputs only. A GROUND (7) screw for you to ground your turntables is located on the rear panel. The stereo LINE (2) input will accept any line level input such as a CD player or a cassette player. 6. Headphones can be plugged into the front panel mounted HEADPHONE (26) jack.
Specifications
INPUTS: Mic....................................................................................1.5mV 600 Ohm Phono.......................................................................................3 mV 47 kOhm Line...................................................................................150 mV 27 kOhm OUTPUTS: Amp................................................................................0 dB 1V 400 Ohm Max............................20V Peak to Peak GENERAL: Gain (Channels 1 - 2)..................................................................0 to -20 dB Frequency Response...........................................20 Hz - 20 kHz +/- 2 dB Distortion...............................................................................................0.02% S/N Ratio.........................................................................better than 80 dB Talkover Attenuation.........................................................................-16 dB Headphone Impedance..................................................................16 Ohm Power Source.............................................................115V/15V AC 7.5 W 230V/15V AC 7.5 W Dimensions.........................................6.5" x 9" x 3" (165 x 221 x 85 mm) Weight...................................................................................3 lbs. (1.3 kg)
Operation
1. POWER ON: Once you have made all the equipment connections to your mixer, press the POWER (22) switch. The power will turn on and the POWER LED (21) will glow RED. 2. CHANNEL 1: The GAIN (12) control allows you to individually adjust the gain of Channel 1. Switch (13) allows you to select PHONO 1 (5) or the LINE 1/PHONO 2 (4) inputs. CHANNEL SLIDE (14) controls the input level of this channel. 3. CHANNEL 2: The GAIN (23) control allows you to individually adjust the gain of Channel 2. Switch (24) allows you to select the LINE 2/ PHONO 3 (3) or the LINE 3 (2) input. The CHANNEL SLIDE (25) controls the input level of this channel. Page 3
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 Description PANEL CONTROL PANEL REAR BOTTOM COVER BRACKET VR (SUB CHASSIS) HOLDER FADER KNOB SWING (LONG) KNOB PUSH (SMALL) KNOB BUSHING (SMALL) KNOB SLIDE (BIG) KNOB ROTARY (B TYPE) INLAY KNOB (SILVER) INLAY KNOB (RED) TRIM VR HOLDER LED (3f 17mm) PAD FOOT DUST PROOF CLOTE-VR SWING DUST PROOF CLOTH CLIP WIRE GND SCREW SCREEN SNAP RIVET Part #
FACEPPMX350
034-010 032-018 021-774 022-366 023-674 002-531 002-532 002-724 003-110 148-312 148-238 003-970 003-969 049-206 159-171 159-216 049-190 146-710 046-027 003-612
Parts Lists - PCB
Printed Circuit Boards
Item # 1 2 3 4 PRINTED PRINTED PRINTED PRINTED Description CIRCUIT CIRCUIT CIRCUIT CIRCUIT BOARD BOARD BOARD BOARD PMX40-1 PMX40-2 PMX40-3 PMX40-4 Part # 262-057 262-058 262-067 262-068
ICs
Item # 1 2 3 4 5 Designators IC3, IC4 1C1-2, IC5-6, IC10 IC8 IC7 IC9 Description INTEGRATED CIRCUIT LB1423N INTEGRATED CIRCUIT NJM2068LD INTEGRATED CIRCUIT NJM4556L INTEGRATED CIRCUIT NJM7912FA INTEGRATED CIRCUIT NJM7812FA Part # 074-154 074-145 074-113 074-114 074-107
Electrical Parts
Item # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Designators Q1-4 D12, D15 D13, D16 D1-3, D7-8, D14 D4-6, D9-10, D11 J1, J7 VR2, VR6 SW6, SW7 SW3 SW2, SW4 SW1, SW5 VR3 VR1, VR5 VR4 X-FADER Description TRANSISTOR DTC114TS RECTIFIER DIODE 1N4002 (1N4003,1N4004) ZENER DIODE 1/2W 12V LIGHT EMITTING DIODE (RED) 3.15f LIGHT EMITTING DIODE (GREEN) 3.15f PHONE JACK 6.3f MIC,PHONES SLIDE VR 45mm CH1/CH2 50KAŚ2 SLIDE SWITCH 2P2C LEVER SWITCH 2P2C CUE CH1/CH2 LEVER SWITCH 4P2C PHONO/LINE PUSH SWITCH 2P2C L=12.5 POWER,TALKOVER ROTARY VR 16f L=20 MIC 50KA ROTARY VR 16f L=20 GAIN 10KAŚ2 ROTARY VR 16f L=20 CUE 50KAŚ2 RAILGLIDE VR45mm X-FADER 100KX2 Part # 076-094 079-027 079-012 080-091 080-104 092-078 072-035 081-004 082-018 082-019 083-080 071-066 071-161 071-084 072-113
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PCB
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+VCC R5 4K3 +VCC D1 R43 47 LED R44 47
D6 LED SW1B
D5 LED
D4 D3 LED LED
D2 LED
D11 LED
D10 LED
D9 D8 LED LED
D7 LED
1
2
3
4
6
9
1
2
3
4
6
X1
C12
1 R17 47 R38 47 C14 7 5 8 7 5 C26 C5 R8 1K R26 R36 22P 47 C17 22/16 8 C20 0.47 -VCC C21 1 10/16 10/16 2068LD 4 R39 -VCC R32 91K 47 C27 22/16 R40 33K R61 33K 91K 3 R31 IC2A 2 IC2B 6 7 5 10K 2068LD R35 C24 +VCC R30 C19 10K 10/16 R34 4K3 R54 C38 10K 10/16 R51 4K3 C39 0.47 10/16 J1 R2 1K 1% R3 C1 22/16 1K 1% R25 30K1 1% C13 101 C15 22/16 C3 22/16 101 30K1 1% IC3 B1423N 8 IC4 B1423N VR3 50KA
R19
R11
R12
-VCC +VCC
MIC
B1423N B1423N
Schematic
47/16
180
8K2 C7
100K C6
2
822
8
273
3
2
IC1A
1
J3
R7 3 1K
2068LD
MIC
R4 47K
4
C2
56
C11 22/16
R6 47K
C4
56 R18 1K R57
R13
IC1B 2068LD
5
C8
1K
7
6
C16 47/16
10/16
R22
C10
C9
180
822 R16
273 R15
CH1
SW1A R1 20K VR2A R20 16K R33 2 1 10/16 3 18K R37 4 Q2 1K8 DTC114TS C18 R97 SW2C VR1B 5K6 50KA R29 1K8 Q1 DTC114TS C25 22/16 SW2A 10KA R9 1K 18K C34 6 7 10/16 5 R21 16K R28 1K 10/16 VR2B R23 R56 C42 4.7P 470K SW2B 10KA 5K6 50KA R10 1K R93 47 R94 47 C32 R24 8 +VCC 4.7P SW2D VR1A
T.O
C43
470K R52 10 C36 22/16 C60 10/16 IC5A 2068LD J6 R45 C31 22/16 10 -VCC R78 47K R81 430
8K2
100K
+VCC
C71
R103
R101
R99
-VCC +VCC
47/16
180
8K2 C72
100K C76
822
8
273
2
IC10A 1
J2
R95 3 1K
2068LD
R79 47K C55 10/16 IC5B 2068LD R83 430
R14 47K
56
4
C74
C22 22/16
9
T.O
MASTER
R27 47K
C75
56 R98 1K 5 4 3 2 R 6 1 VR5A C41 10KA 10/16 R73 1K 50KA SW4B R71 5K6 VR6A R63 16K R55 18K R69 1K8 Q4 DTC114TS VR5B SW4D C47 10KA 10/16 SW4C R67 1K 50KA VR6B R70 5K6 R62 1K8 Q3 DTC114TS R68 16K R53 18K SW4A R60 1K
R96
IC10B 2068LD X-FADER 100KB
POWER
D14 R88 LED 4K3 -VCC
5
C23
1K
7
6
10/16
R66 47 R72 47
R87 750 1N4002 L
C62 470/25
GND
8
822
273
2
IC6A
1
SW5A
J4 C45 22/16
R42 3 1K
2068LD
POWER
X3 D13 Z 12V C61 47/16
R41 47K
4
C28
56
C44 22/16
R46 47K
C35 56
AC 15V
D16 Z 12V C65 47/16
R47
5
1K
IC6B 2068LD 7 R75
6
C37 47/16
1K
R59
C46
C40
SW5B
180
822 R65
273 R64
J5
R58
8K2
100K
C52 R84 750 D12 2 Vin
1
2
C48 101
10/16
GND
VR4A C51 2 3 50KA
8
4
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CH2 CH1/CH2
SW3A SW3B
C70
R104
C73
C77
47/16
180
822 R102
273 R100
8K2
100K
X4
IC9 7812 D15 1 Vin Vout 3 C67 1/50 +VCC
C30
R50
R48
R49
-VCC +VCC
47/16
180
8K2 C29
100K C33
1K
C63 1/50 Vout R89 1N4002 +VCC C66 470/25 IC7 7912 3 -VCC
R74
C49 101
C50
1K
10/16
CUE
IC8A 1 4.7/16 R80 120K 4556 C56 C59 47/16 VR4B C53 6 7 50KA 4.7/16 R77 120K 5 4556 C57 C54 47/16 47P R76 1K R86 27K IC8B 47P R82 1K R85 27K
10 C64 220/16
R92 47 R91 10 C68 220/16 -VCC C69 472 J7
CUE
R90 47 C58 472