Icom IC-M803 Service Manual page 77

• MAIN UNIT (9/9)
LDTA114YE
5.5
ALC
MAIN UNIT(3/9)
D5921
ALCL
MAIN UNIT(5/9)
L1SS400
Explanatory notes
TX Line
RX Line
Voltage Line
Measuring condition:
• 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
RX
RX
R5902
Q5901 180K
L1SS400
Q5902
R5903
RU1L002SN
220K
R5904
C5910
4.7K
100P
R5912
120K
6
R5913
7
R5914
5
100
Q5911
IC5911
L2SC4081
NJM2058V
C5912
–0.1
0.1 2
R5916
1
39K
3
IC5911
R5917 R5918
NJM2058V
–3.2
56K 47K
C5921
0.001
R5922
4.7M R5923
2
R5921
1
1.8M
R5924
3
0
IC5921
1M
NJM2058V
6
7
5
IC5921
NJM2058V
(unless otherwise noted)
Unit: Volt
8V
–12V
D5901 R5931
LDTC143ZE
10M
Q5932
R5932
470K
C5955
C5954
1 1
C5956
0
1
C5957
1
C5958
1
R5933
C5959
C5942
1
0
R5942
R5941
D5941
14
L1SS400 470 IC5911
NJM2058V
R5952
2.2M
R5951
D5951
L1SS400 2.2K
8
IC5911
NJM2058V
C5963
0.047
R5962
1M
13
D5961 R5961
14
12
L1SS400 470
IC5921
NJM2058V
R5972
220K
9
D5971 R5971
8
10
L1SS400 470
IC5921
NJM2058V
R5982
1K
11-11
18P
C5943
100P
2.2M
R5943 C5944
13
220K
0.22
R5945
12
18K
R5954
9
100K
R5956
10
2.2K
L1SS400
R5963 D5962
100K
R5967
R5965 D5963
68K
L1SS400
NTCG16
R5973
10K
–12V
8V
-12V
8V
MAIN UNIT(2/9)
-12V
NASBS
FORLP
POCV
MAIN UNIT(1/9)
REFLP
PFIDL
ICCV
EALC