Polytone_pa378b_sch 电路图 维修原理图.pdf

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1、+ + 10uF 25V R1 1K C3 .01 R3 470 R4 4.7K R5 4.7K C4 .01 PT1583 Q1 Q2 NSDU57 100 C7 C6 50uF 50V C8 100p 100p 10K R6 470 R7 R8 + Q5 MJ 4502 Q3 NSDU07 Q4 NSDU57 Q6 MJ 802 I NPUT + + RED/AC RED/AC BLU/CT CR1 OUTPUT + - C9 50uF 50V C10 7300uF C11 7300uF C12 .1 100 D1 D2 D3 D4 R20 .3 10w R21 .3 10w POLYTO

2、NE POWER AMP PA 373B modifi ed C1 .0033 C2 R2 15K C5 1uF 50V NP R9 470 R10 470 1/2 W R12 2.2K 1/2 W R11 R13 47 R14 2.5K BI AS ADJ . R16 100 D7 R18 .075 5w R15 100 R17 .075 5w D6 R19 3.3 R22 220 1/2 W R23 220 1/2 W 2.5K Notes, unless specified: 1. Resistor Values in Ohms (1/4W 5%) 2. Capacitor Values in uFD 3. Diodes D1 thru D7 are 1N4004 4. D3, D4 must contact Q3, Q4 thermally additional resistor on solder side Q1 = PT1583, replaced by 2 x 2N5210 Q2, Q4 = NSDU57 = MPSU57, replaced by MJE172 Q3 = NSDU07 = MPSU07, replaced by MJE182 Q4 = MJ4502 Q5 = MJ802 5 5 收音机爱好者资料库 Ra d i o Fa n s .CN