Icom IC-R20 Service Manual - Page 66

12-3 BC-156 VOLTAGE DIAGRAM • MAIN UNIT EXT. DC IN 13.5V J1 13.5V (EXT DC) F2 F3 S-N5051 S-N5051 F1 FGB 2A C7 C8 0.22 100 C1 0.22 R19 0.15 (1W) Q7 2SJ377 R18 1k C9 0.22 C10 0.001 R17 680 5.4V L1 HK08S050-2010 D2 SB20-03P C2 8 7 6 5 CD SI V+ INVIN CS ES CT GND 1 2 3 4 C3 470p 470 IC2 NJM2360AM D6 SB20-03P R16 47k R15 150k C4 470 C12 470 R23 10 5.1v C21 47 1 2 3 4 5 6 7 8 9 10 11 12 CHGSW RESET TP1 TP2 VREF GND1 GND2 ADJ1 ADJ2 ADJ3 ADJ4 TDET 5.2V CHG ON CHG OFF 3.0 Vp-p 1.77 ms 0.6V D1 SB20-03P R3 R21 560 Q5 560 DTA114EE C13 0.001 Q6 DTA114EE D3 MA2S111 Q1 2SB1184 R2 C15 150 0.001 C14 0.001 C6 C16 0.1 0.15 R6 CP1 C36 120k 4.7 24 23 22 21 20 19 18 17 16 15 14 13 OSCFB- OSCOUT LEDR LEDG VOUT ADJ5 VCC CNT CFB CS BAT2 BAT1 R5 10k G R C5 0.01 DS1 VRPG3349S-734 IC1 MM1433EVBE SW D4 MA132WK Q2 DTA114EE R9 R14 220k 100k Q4 DTA114EE 4 1 3 2 D5 DWA010 DET1 DET2 R11 12k R12 2.7k C19 C18 R22 0.1 C20 0.1 56k 0.001 Q3 UNR9214J Q8 DTC114EE CONT DET1 DET2 CONT SW MAIN UNIT SW Explanatory notes VOLTAGE LINE CHG ON 1.2V CHG OFF 0V C22 0.1 C23 0.001 C24 0.1 C25 0.001 C26 0.1 C27 0.001 J4 CHGOUT CHGOUT DET2 BATT- DET1 BATT+ 1 2 3 4 5 SW CONT THD 6 7 8 9 to TANSHI board J1 C28 0.1 C29 0.001 C30 0.1 C31 0.001 C32 0.1 C33 0.001 C34 0.1 C35 0.001 THD DET2 DET1 CONT BATT- • TANSHI BOARD J1 R1 to BC-156 MAIN unit J4 1 2 3 4 5 6 7 8 9 CHGOUT CHGOUT DET2 BATT- DET1 BATT+ 5V CONT THD 0.15 RL1: ON 0V RL1: OFF 5.1V BATT+ BATT- D1 1SS53 C1 0.047 R2 10k DET1 DET2 TANSHI BOARD RL1 A-5W-K Explanatory notes VOLTAGE LINE SBATT+ CP1 + SBATT- CP2 - DET1 DET1 CP3 DET1 BATT+ CP4 + BATT- CP5 - DET2 CP6 12 - 2