Icom IC-M803 Service Manual page 76

• MAIN UNIT (8/9)
8V
DA5V
8 8 8
V+ V+ V+
MCLK GND GND GND
MCLK
BCLK 4 4 4
BCLK
FRM
FRM
/FPCAL
/FPCAL
DX_AFO
DX_AFO
DX_ACC
DX_ACC
DX_REFC
DX_REFC
DX_AGC
DX_AGC
DR_AMOD
DR_AMOD
R5507
100
5
3
R5506
4
1
0
IC5502
2
NJU7056F3
EP5501
MPZ1608S601A
IC5501
1 ZR1/ZR1/FMT0 28
R5501 ZR2
2 MS/ADR/FMT1 27
VOUT1
0 3 MC/SCL/DEMP 26
VOUT2
R5502 4 MD/SDA/MUTE 25 10 C5506
VCOM
5 24
MCLK 22
SCK AGND2
DX_ACC 6 23
DATA1 VCC2
BCLK 7 22
BCK VOUT3
FRM C5501 8 21
LRCK VOUT4
9 20
VDD VOUT5
R5503 1 10 19
DGND VOUT6
DX_REFC 22 11 18
DATA2 AGND1
DX_AFO 12 17
DATA3 VCC1
DX_AGC 13 16
DATA4 VOUT7
14 15
MSEL VOUT8
PCM1681
8
V+
GND
4
8V
DA5V
R5525 2.7k
C5524 820P
18k
R5522 R5524
2
IC5521
R5526 C5525
1
5.6k
3
100 1
TS462CPT
C5526
R5523
1
1K
8V
SHORT1005
CP5601
6 IC5521
7
5
TS462CPT
R5548
3.9K
C5546 820P
R5542 R5546
10
IC5541
6
R5550 C5548
7
C5550 3.9K 12K
5
100 10
NJM3404AV
1
R5543
C5507
1K R5549
6.8k
C5508
C5547 820P
1
R5544 R5547
10 IC5541
2
R5551 C5549
1
3.3k
C5552 6.8k
3
10
100
NJM3404AV
R5545
1K
R5565
10K
C5564 0.01
R5562
2
IC5561
R5566
1
10K
3
100
R5563 NJM2904CRB1
1K
6 IC5561
7
5
NJM2904CRB1
14V
DA3R3V
R5584 R5588
100K 100K
IC5581
6
R5589
7 Q5581
R5582 R5585
5 L2SC4081
100
R5592
0 100K NJM2904CRB1
10K
R5586 R5590
100K 100K
2 IC5581
R5591
1 Q5582
R5583 R5587
3
L2SC4081
100
R5593
0 100K NJM2904CRB1
10K
13.3
R5604
C5604
0
1
R5603
4.7k
AAF
CP5551
AAFE
SHORT1005
MAIN UNIT(1/9)
DSAF
CP5552
DSAFE
SHORT1005
MAIN UNIT(7/9)
XOCV
HAGCV
MAIN UNIT(6/9)
DAGCV
4.9
3.2
IC5621
20 1
MODE1 VINL
19 2
MODE0 VINR
18 3
FMT1 VREF1
17 4
FMT0 VREF2
16 5
OSR VCC
R5622 15 6
SCKI AGND
/FPCAL
14 7
VDD PDWN 8
MCLK 13
DGND BYPAS
AMOD/MMOD
DR_AMOD 12 9
DOUT FSYNC
BCLK 11 10
BCK LRCK
22
PCM1802DBR
R5621
FRM
22
11-10
8V
14V
DA5V
L5601
LW-15
C5615
AFO
1000
MAIN UNIT(1/9)
AFE
AFE
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.
Explanatory notes Voltage notation:
TX Line
TX
RX Line
RX
RX
Voltage Line
14V
DA5V
DA3R3V
C5651
0.1
IC5651
1
COM VCC
2
INH CH0
3
VEE CH1
4
GND
TC7W53FK
R5645 C5644
10K 10
C5661
0.1
IC5661
1
COM VCC
2
INH CH0
3
VEE CH1
4
GND
TC7W53FK
C5681
0.1
IC5681
1 8
COM VCC
2 7
INH CH0
3 6
VEE CH1
4 5
GND A
TC7W53FK
8V
AFONS
14V MAIN UNIT(1/9)
DA5V
DA3R3V
Unit: Volt
C5654
8
1
R5654 C5653
7
DSMD
6 47k 1
R5655
CP5651
5 MAIN UNIT(1/9)
A
680
SHORT1005
DSMDE
DMODS MAIN UNIT(5/9)
Q5651
LDTC143ZE
C5664
8 1
C5663
7
AMOD
6 1
CP5661 MAIN UNIT(1/9)
5
A AGND
SHORT1005
AMODS MAIN UNIT(5/9)
Q5661
LDTC143ZE
C5684
1
R5687
C5683
FMOD
1
MAIN UNIT(1/9)
CP5681 3.3K
FMODG
SHORT1005
MAIN UNIT(5/9)
MMODS
Q5681
LDTC143ZE