Carvin_sx300r_3 电路图 维修原理图.pdf

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1、S401.A S401.B CHANNEL SWITCH S402.A S402.B S403.A S403.B R701 10K R702 10K R700 10K CH1 CH2 CH3 +5V DSP +5V DSP +5V DSP S700.A S700.B R703 10K REV +5V DSP CH1 ON CH2 ON CH3 ON BIT1(PX_COUT0)010 BIT2(PX_COUT1)001 CH1 FET+-1500 CH1 FET-0-15-15 CH2 FET+0-150 CH2 FET-150-15 CH3 FET-15-150 switch pressed

2、CHB1CHB3CHB2 Pin 20, Pin 19, CH1 D701 CH2 D702 CH1 FET +CH2 FET+ R706 R707 2.2k 2.2k REDYELLOW -15VDC Q711 R704 47K -15VDC Q710 R705 47K A40.A 4 5 + 2 A40.B 6 7 +1 A40.C 10 11+ 13 A40.D 8 9 + 14 R714 10K D705 D706 R716 10K R715 100K 1N914 1N914 COMP REF COMP REF COMP REF CH1 FET - CH2 FET - CH3 FET

3、- - When Channel OFF - When Channel 3 OFF CH1 FET + CH2 FET+ Q707 R713 100K CH1 LED CH1 LED CH3 D703R708 2.2k -15VDC GREEN +5V DSP R712 R717 10k 10k Q709 R709 47K Channel Logic R710 10k -15VDC Q708 R711 47K - When Channel 2 OFF 0 WHen ON R719 10k -15VDC Q706 R718 47K 0 WHen ON 0 WHen ON 0 When Chann

4、el 2 OFF - WHen ON 0 When Channel 2 OFF - WHen ON BIT1(MIDDLE) BIT2(MIDDLE) R732 +5V DSP R499 POWER D499 220 Diode 1N914 SMT D708 100 D704 R G Q703 Q700 R724 R727 BIT2(MIDDLE) 47K 47K R728 470 R731 470 Q702 R729 680 R730 1.5K R722 BIT1(MIDDLE) 10K R726 R721 Q705 R723 R725 Q704 R720 +5V DSP BIT2(MIDD

5、LE) +5V DSP D707 +5V DSP Q701 10K BYPASS LED(MID) 12340 World Trade Drive San Diego, CA 92128 (858) 487-1600 FAX 487-6629 REVISED BY: APPROVED: DRAWN BY: DATE: DATE: ASSY. DATE: ARVIN REV: REV: NO: PCB NO: C A.J.Ashley DSP BIT1(MIDDLE) BIT2(MIDDLE) 9JUL02 30- 03300 80- 03300 B DSP MIDDLE H7B.H H7B.G H7B.A H7B.C H7B.B H7B.E H7B.D H7B.F H8B.H H8B.G H8B.E H8B.F D GND TO FRONT 1/2 H1B CH1 CH2 CH3 REV DSP SEND(OUT) DSP RET(IN) MAIN OUT B INPUT(FROM BCK) BYPASS LED(MID) +5V DSP R799 Q799 R791 47K PAGE 3 of 5 47K 10K 10K SX 300R A 收音机爱好者资料库 Ra d i o Fa n s .CN