Icom IC-R20 Service Manual

2 - 2
2-2 LOGIC UNIT
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BFO circuit
IC6: SN74AHC1GU04DBVR
X2: CSBFB543K
AF amplifier regulator
(Q7: XP1501
Q9: 2SB1132)
AF amplifier
(IC15: TA31056F
Q8: 2SA1588)
AF pre-amplifiers
(Q12, Q16: 2SC4617)
+3 regulators
(Q10, Q15:
2SA1362)
Reset IC
(IC2: BD5228G)
Main CPU
(IC3: M30620MCP-129GP [OTHER],
M30620MCP-130GP [USA])
B-BAND AF circuit
Q24: XP6501,
Q27: 2SJ144,
Q22: 2SC4617,
IC7: SM6451B
A-BAND AF circuit
Q25: XP6501,
Q26: 2SJ144,
Q23: 2SC4617,
IC7: SM6451B
+3V reg.
(Q17: 2SA1588)
Battery daging regulators
(Q30: 2SB1201, Q32: 2SC4617, Q33: 2SB1132)
LCD
(DS12: M3-0243TIY)
+3SC reg.
(Q13: XP6501)
+3S reg.
(Q14: 2SA1588)
3V reg. IC
(IC8, IC9: R1111N321B)
Recording/playback IC
(IC7: ML2302TB)
+3V regulator
(IC1: BD5228G,
IC10: R1111N321B)
Mute (when SQL off)
(IC8, IC9:
SN74AHC1G66HDBVR)
USB interface IC
(IC3: FT245BM)
Sub CPU
(IC2: M30620FCPGP)
Flash memory for
recording/playback
(IC6: K9F5608UOC-YCBO)
2-3 REC UNIT
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Icom IC-R20 Specifications

General

Mode	AM, FM, WFM, SSB, CW
Antenna Connector	BNC
Memory Channels	1250
Selectivity	AM/FM
Output Power	150mW at 8 Ohms
Battery Life	Approx. 8 hours with BP-206 (at 50mW audio output)