Icom IC-R20 Service Manual - Page 6

Inside views, RF UNIT

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SECTION 2 INSIDE VIEWS 2-1 RF UNIT • Top view A/B-UHF (pre-amplifier (Q551: PA805T) Highpass filter circuit (C854, C856, C858) 1G RF amplifier (Q26: 2SC5624) 470-833 MHz RF amplifier (Q24: 2SC5008) B-BAND RF amplifier (IC18: PC2746TB) B-BAND 1st mixer (IC15: PC2757TB) SSB AF amplifier (Q532: 2SK1069) B-BAND 1st IF filter (266.7 MHz) (FI1: EFCH266MKQP1) B-BAND 2nd mixer (IC16: PC2757TB) BFO mixer (D115, D116: RB876W) B-BAND 2nd IF amplifier (Q542: 2SC5006) B-BAND FM IF IC (IC17: TA31136FN) B-BAND 3rd Lo amplifier (Q555: 2SC5006) SSB IF amplifier 450 kHz (Q531: 2SC4617) • Bottom view A/B-VHF pre-amplifier (Q550: FH102) A-VHF A-band RF amplifier (Q14: 2SC5006) MF/HF-L/HF-H RF amplifier circuit Q505: 2SC4226, D163, D164: MA2S728 1STAVCO BOARD A-BAND AM detector and AGC amplifier (Q4: XP6501) A-BAND IF amplifier (Q1: XP6501) 2 - 1 B-UHF RF amplifier (Q548: 2SC5006) Lowpass filter circuit (L123-L125) A-UHF RF amplifier (Q35: 2SC5006) 30-300 MHz RF amplifier (Q36: 2SC5006) PLL reference oscillator circuit Oscilktes 19.200 MHz X1: CR-593, D171: HVC350B Q556: 2SC4617 A-BAND RF amplifier (IC19: PC2757 TB) A-BAND 1st mixer (IC1: PC2757 TB) A-BAND 1st IF filter (429.1 MHz) (FI4: EFCH429MKQP4) A-BAND 2nd mixer (IC10: PC2757TB) A-BAND 3rd Lo amplifier (Q540: 2SC5006) A-BAND IF IC (IC2: TA31136FN) A-BAND 2nd IF filter (19.65 MHz) (FI3: FL-293) A-BAND 2nd IF amplifier (Q5: 2SC5006) DOWNCONV BOARD 1STBVCO BOARD Bar antenna B-BAND AM detector and AGC amplifier (Q545: XP6501) 2NDDVCO BOARD 2NDCVCO BOARD B-BAND IF amplifier (Q544: XP6501)

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2 - 1
SECTION 2
INSIDE VIEWS
2-1
RF UNIT
• Top view
• Bottom view
Highpass filter circuit
(C854, C856, C858)
470
—
833 MHz
RF amplifier
(Q24: 2SC5008)
1G RF amplifier
(Q26: 2SC5624)
B-BAND RF amplifier
(IC18: PC2746TB)
B-BAND 1st mixer
(IC15: PC2757TB)
B-BAND 1st IF filter
(266.7 MHz)
(FI1: EFCH266MKQP1)
B-BAND 2nd mixer
(IC16: PC2757TB)
SSB AF amplifier
(Q532: 2SK1069)
SSB IF amplifier
450 kHz (Q531: 2SC4617)
BFO mixer
(D115, D116: RB876W)
B-BAND 3rd Lo amplifier
(Q555: 2SC5006)
B-BAND 2nd IF amplifier
(Q542: 2SC5006)
A-BAND IF IC
(IC2: TA31136FN)
A-BAND 2nd IF amplifier
(Q5: 2SC5006)
A-BAND 3rd Lo amplifier
(Q540: 2SC5006)
A-BAND 2nd IF filter
(19.65 MHz)
(FI3: FL-293)
A-BAND 2nd mixer
(IC10: PC2757TB)
A-BAND 1st IF filter
(429.1 MHz)
(FI4: EFCH429MKQP4)
A-BAND 1st mixer
(IC1: PC2757 TB)
A-BAND RF amplifier
(IC19: PC2757 TB)
30
—
300 MHz RF amplifier
(Q36: 2SC5006)
A-UHF RF amplifier
(Q35: 2SC5006)
B-UHF RF amplifier
(Q548: 2SC5006)
Lowpass filter circuit (L123
—
L125)
A/B-UHF (pre-amplifier (Q551: PA805T)
PLL reference oscillator circuit
Oscilktes 19.200 MHz
B-BAND FM IF IC
(IC17: TA31136FN)
X1: CR-593,
D171: HVC350B
Q556: 2SC4617
B-BAND
AM detector and AGC amplifier
(Q545: XP6501)
A-BAND AM detector
and AGC amplifier
(Q4: XP6501)
A/B-VHF
pre-amplifier
(Q550: FH102)
A-VHF A-band
RF amplifier
(Q14: 2SC5006)
MF/HF-L/HF-H
RF amplifier circuit
Q505: 2SC4226,
D163, D164:
MA2S728
B-BAND IF amplifier
(Q544: XP6501)
A-BAND IF amplifier
(Q1: XP6501)
DOWNCONV BOARD
1STBVCO BOARD
1STAVCO BOARD
Bar antenna
2NDDVCO BOARD
2NDCVCO BOARD