Inside Views; Top View; Bottom View - Icom IC-28A Instruction Manual

SECTION 6 INSIDE VIEWS :
TOP VIEW
(MAIN UNIT)
ІС6 SC-1019 (PA Module)
Transmit Driver Unit
DC-DC Converter : |
C-— — 1С8 NJM4558D
VCO (Voltage Controlled Oscillat
(Mic Amp/Pre-emphasis)
IC1 MB87001P (PLL Control)
X1 (Reference Oscillator Crystal) Optional Squelch Unit
(UT-28 or UT-29)
1C2 MB504P (Pre-scaler)
BOTTOM VIEW
(RX UNIT)
[To reset malfunctioning CPU,
turn ON ІС-28А/Е and push
reset switch.]
BT1 BR2032-1T2
(Backup Lithium Battery)
FI2 17M15B (Crystal Filter)
Receive Bandpass Filter ІС4 uPC1241H (AF Amp)
(Helical Cavity)
Receive Bandpass Filter
C2 uPC1241H (AF Audio A
O4 25С3355 (RF Amp)
и
(
udio
Amp)
Q3 2SK125 (1st Mixer)