Icom IC-M803 Service Manual page 70

• MAIN UNIT (2/9)
14V
14V
MAIN UNIT(1/9)
HV
HV
DCLK_P
MAIN UNIT(7/9)
DCLK_N
MAIN UNIT(5/9) PWRSR
TO DC-DC
0.1
J4201
EP4201 C4201
HV HV
30
MPZ2012S101A
HV
29
HV
28 EP4202
14V
14V
27
14V MPZ2012S101A
26
14V
25
14V
24
14V
23
NC
22 EP4203
H3R3V
H3R3V
21
H3R3V
20 MPZ2012S101A
H3R3V
19
H4V EP4204 H4V
18
MPZ1608S601A
EP4208 I5V
I5V
17
MPZ2012S101A
I5V
16
I5V
15
I5V
14
A5V EP4206 A5V
13
MPZ1608S601A
EP4205 8V
8V
12
MPZ1608S601A
8V
11
NC
10
GND
9
GND
8
GND
7
GND
6
GND
5
GND
4
GND
3
DCLK_P
DCKL_P
2
DCLK_N
DCKL_N
1
MAIN UNIT(5/9) DCSYNCS
Measuring condition:
(unless otherwise noted)
• Frequency: 12.23 MHz
• Mode: J3E (USB)
• RX: No signal is received.
• TX: No modulation signal is applied.
• Waveforms are measured by
an oscilloscope.
Voltage notation:
TX
Unit: Volt
RX
RX
Explanatory notes
TX Line
RX Line
Voltage Line
H4V
EP4232
I5V
MPZ2012S601A
H3R3V
IC4261
EP4233 TPS54418RTE C4268 L4261
MPZ2012S601A 0.1 3.3U
1 12
VIN PH
2 11
VIN PH
3 10
GND PH
C4269
4 9
GND SS
0.01
R4261
0
R4264
C4270
1K 0.01
H3R3V
C4261
0.1
L4282
8V
10U
MP4201
3182
A5V
EP4381
MPZ2012S601A
ADP5075ACBZ
SS GND
B3 C1
SLEW SYNC/FREQ
B2 C2
VREG EN
B1 C3
SW VREF
A3 D1
PVIN FB
A2 D2
AVIN COMP
A1 D3
IC4381
R4382
100
H3R3V
R4321
1
H4V
2
2.7
3
1
I5V
2
3 ON/OFF
1
I5V
2
3 ON/OFF
Q4342
LDTA114YE
EP4261
Q4341
RE1J002YN
MPZ2012S300A
1
I5V
2
3
1
8V
2
3
8V
8V
A5V
D4383
EP4382
-12V
–12V
LRB551V MPZ2012S601A
R4386
560K
R4387
560K
3183
MP4381
11-4
3.3
H3R3V
1.1
FP1R1V
2.5
IC4321
5
FP2R5V
VIN VOUT
VSS
4
CE NC
XC6222D251MR
3.3
IC4331
5
3R3V
VIN VOUT
VSS
4
NC
S-1313D33
3.3
IC4341
5 DA3R3V
VIN VOUT
VSS
4
NC
S-1313D33
1.8
IC4371
5
1R8V
VIN VOUT
VSS
4
CE NC
XC6222D181MR
5
IC4361
5 DA5V
VIN VOUT
VSS
4
CE NC
XC6209F502MR
7.9
8V
8V
5
A5V
–11.8
-12V
H3R3V MAIN UNIT(1/9 and 1/5)
FP1R1V MAIN UNIT(7/9)
FP2R5V MAIN UNIT(6/9 and 7/9)
3R3V MAIN UNIT(1/9 and 6/9)
DA3R3V MAIN UNIT(6/9,7/9 and 8/9)
1R8V
MAIN UNIT(6/9)
DA5V MAIN UNIT(8/9)
MAIN UNIT(1/9,3/9,4/9,6/9,8/9 and 9/9)
8V
A5V MAIN UNIT(1/9,3/9 and 5/9)
-12V MAIN UNIT(9/9)