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1、Page 1 SERVICE MANUAL PMX-80 Stereo Preamp Mixer CONTENTS: Connections PH2LN1 GAINCH-1 LN3;PH3LN2 GAINCH-2 R51 20K R62 20K R124 20K R125 20K SW4 2 3 1 48 IC1A 2068LD 6 5 7 IC1B2068LD R13 100K R9 8K2 R12 180 R11 47K R6 8K2 R7 47K R1 180 R5 100K C9 822 C8 56 C11 273 C4 56 C2 273 C6 822 C1 47/16 C5 47/
2、16 R8 1K R4 1K C12 10/16 C7 10/16 R14 1K R3 1K PH1 +1 -1 X1 J1A J1B 6 5 7 IC2B 2068LD 2 3 1 48 IC2A 2068LD R26 100K R24 8K2 R28 180 R22 47K R21 8K2 R16 47K R17 180 R18 100K C18 822 C21 56 C23 273 C16 56 C14 273 C17 822 C20 47/16 C24 47/16 R23 1K R20 1K C19 10/16 C13 10/16 R25 1K R15 1K SW1A SW1B PH2
3、/L2 PH2/L2 +3 -3 2 3 1 48 IC3A 2068LD 6 5 7 IC3B2068LD R41 100K R40 8K2 R39180 R38 47K R35 8K2 R34 47K R29 180 R33 100K C33 822 C32 56 C36 273 C28 56 C26 273 C31 822 C25 47/16 C29 47/16 R36 1K R32 1K R43 1K R44 1K C38 101 C39 101 C35 10/16 C37 10/16 C30 10/16 C40 10/16 R31 1K R42 1K SW2A SW2B PH3/L2
4、 PH3/L2 L3 +2 X2 J2A J2B -2 +VCC -VCC X4X3 D3 1N4002 D4 1N4002 C44 1000/25 C47 1000/25 Vin 1 GND 2 Vout 3 IC4 7812 Vin 2 GND 1 Vout 3 IC5 7912 C43 1/50 C46 1/50 AC15V-JACK D2 Z 12V D1 Z 12V SW3B SW3A R48 750 R47 750 1 2 J4 POWER C48 100/16 C45 100/16 R2 10 C3 22/16 +1 R30 10 C27 22/16 -VCC +2 R10 10 C10 22/16 -1 R37 10 C34 22/16 +VCC -2 R27 10 C22 22/16 R19 10 C15 22/16 +3 -3 J2C MASTER X4 IN/OUT PCB Page 8 Schematic RadioFans.CN