Inside Views; Display Board; Pa Unit - Icom IC-703 Service Manual

SECTION 2

• DISPLAY BOARD

Sub CPU Sub CPU
(IC6: HD6433842RB27H) (IC6: HD6473847RH)
SW LED dimmer SW LED dimmer
Q50: 2SB1132 Q50: 2SB1132
Q51: 2SC4081 Q51: 2SC4081
+5V regulator +5V regulator
Main dial Main dial
Reset IC Reset IC
(IC4: S-80945CLMC-G7F) (IC4: S-80945CLMC-G7F)

• PA UNIT

Expand IC Expand IC
(IC600: ISPLSI2064VE)
(IC600: ISPLSI2064VE)

INSIDE VIEWS

2 - 1
LCD driver LCD driver
(IC2: SED1522F0C) (IC2: SED1522F0C)
Back light dimmer Back light dimmer
Q2: 2SB1132 Q2: 2SB1132
Q3: 2SC4081 Q3: 2SC4081
VR board VR board
Key dimmer Key dimmer
Q13: 2SB1132 Q13: 2SB1132
Q14: 2SC4081 Q14: 2SC4081
Pre drive amplifier Pre drive amplifier
(Q101: 2SK3074)
(Q101: 2SK3074)
Drive amplifier Drive amplifier
(Q150: RD01MUS1)
(Q150: RD01MUS1)
Power amplifier Power amplifier
(Q200, Q201: (Q200, Q201: RD07MVS1) RD07MVS1)
(Q200, Q201: RD07MVS1)
TX/ RX switch TX/ RX switch
(RL250: ATN207)
(RL250: ATN207)
Low-pass filter Low-pass filter
Comparator Comparator
(IC640: TA75393)
(IC640: TA75393)
Buffer Buffer
(IC560: NJM2904M)
(IC560: NJM2904M)