Inside Views; Bottom View - Icom ic-r20 Service Manual

SECTION 2
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:
1STAVCO BOARD
A-BAND AM detector
and AGC amplifier
(Q4: XP6501)
A-BAND IF amplifier
(Q1: XP6501)

INSIDE VIEWS

MA2S728
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)