Icom BC-119N Service Manual page 14

SECTION 8
8-1 BC-119N
F1
J1
DC-IN
1
LED
DS1
BLOCK DIAGRAM
MAIN UNIT
2
INPUT VOLTAGE
1st REG.
Q1 : 2SB1132
Q12: XP6501
2nd REG.
IC1: NJM2870
R25
5.15 V
VOLTAGE
DETECT
IC3: S-80847ALNP
RESET
IC2 :µPD789112AMC
4.91 MHz
CERAMIC
RESONATOR
X1: CSTCR4M91G
UP/DOWN
CHOPPER
REG.
Q5: UPA1890
D6, D7: SB20-03P
L2
DRIVER
INPUT SEL.
Q3: 2SC4081
Q4: 2SA1576 Q6, Q7: 2SA1576
D4, D5: 1SS355
SW REG.
IC5: µPC494GS
Q8, Q9: 2SC4081
SEL. CTRL
Vin/TEMP
BATT VOLTAGE1
BATT VOLTAGE2
CPU
CURRENT
BATT TYPE
8 - 1
to ADAPTOR
W1
BATT TEMP.
CURRENT
DETECT
BUFF.
IC4B
IC4: NJM12904V
AMP.
IC4A
R24