Icom IC-M88 Service Manual page 35

SECTION 11 VOLTAGE DIAGRAM
VR UNIT
J281
1
VCC W802
1 VCC
FHV 2
W802
2 FHV
C802
0.001
W801 VOLIN
1 3
W801 VOLO
to LOGIC
2 2
J411 W801 GND
3 1
R801
10k-A
F281
ERBFE3R00U
BATTERY
CP281
CP282
CP283
CP284
J351
38
VCC
36
VCC
35
VOLIN
VOLIN
34
GND
33
BTYPE BTYPE
32
S5V
31
M5V
30
V5VS V5VS
29
R5VS R5VS
28
T5VS T5VS
27
GND
26
MICO MICO
25
SMICO SMICO
24
GND
23
W/NS
22
TEMPV
21
to LVINV
20
LOGIC CDECV
CDECV
UNIT 19
UNLKI
J401
18
GND
17
MODIN
16
CDTENC
15
GND
14
VSSTB VSSTB
13
EXSTB EXSTB
12
DASTB
11
PLSTB
10
SDATA
9
SCLK
8
EXOE
EXOE
7
GND
6
WDECV WDECV
5
RSSIV
4
NOISV
3
TDETV
2
BEEPO BEEPO
1
37
GND
T5VS
BTYPE
EXSTB
VCC
T5V
V5V
S5V
R2
R1
22
150k
C1
0.1
VCC
UNLKI UNLKI
SCLK
SDATA
PLSTB PLSTB
S5V S5V
EP2
TEMPV
C5 R5
100k
0.1
FRCON
Q1
2SK1829
DTCON
HV
HV
R7
27k
LVINV
VCC
S5V
C251 R251 SDATA
0.01 470
SCLK
DA5V
S5V
M5V C252
M5V
0.01
W/NS
TEMPV
LVINV
UNLKI
MODIN
CDTENC
DASTB
PLSTB
RSSIV
NOISV
TDETV
T5V
M5V
4.92V
V5V
R322
4.7k
V5VS V5VS
R5VS R5VS
T5VS
S5V
C333
0.001
MAIN UNIT
PLL5V
LOCK: 4.85V
C2 C3 4.78V
C4
UNLK: 0.50V 0.1
0.001 47p
D1
R3 1k
MA2S111
IC1 MB15A02PFV-1
8
9
CLOCK FIN
10 7
DATA LD
11 6
LE GND
12 5
FC DO
13 4
NC VCC
15.3 MHz: 1.40 Vp-p
R12 14 3
EP3
FOUT VP
47 15 2 2nd_Lo
P OSCOUT
16 1 REFIN
B OSCIN
R4 C10
4.89V
NTCG16 4LH 473KT 0.1
R6
10k
X1
R13
C8
R11 Q2
CR-664A 15.300MHz
82k
47k 100p
R9
2SC4215
10k
C7 R14 C11
0.01 47k
100p
C6 D2 C9 C13
2.2 9p 47p
HVC362
R15
D3 C12
MA2S111 100p 1.2k
R8 R10
120k 470k
LVINV
2nd_Lo
R5V
TX: 0.0V
R222
C224 C226 R223
RX: 3.54V
1.2k 2p 10p
150
C222 R221 L221
0.01
680k 1.0µH C223 C225 L222
18p 18p 1.0µH
C221
10p Q221 30.6 MHz: 0.2 Vp-p
2SC4116
FI231
CFWM450E
2 1
FI232
5 4 3
R243
CFWM450G
D231 12 4.7
C236
DAN222
0.01
3 4 5
R236 4.7
D232
DAN222
R233 R237 R238
15k 15k
12k
R234 R235
22k 22k
W/NS
R5V C237
C233 C234 C235
120p
0.1
0.1 0.1
W/NS
R240
47k
Q231
DTA144EU
WIDE: 0.0V
NARROW: 4.98V
RSSIV
NOISV
TDETV
T5V
TX: 4.87V
TX: 0.0V
RX: 0.0V
RX: 4.96V
R5V
M5V
Q321 Q322 Q323
2SA1588 2SA1588 2SA1588
C325
22
T5V
R5V
C326
4.7
R321 R323 R325
10k 10k 10k
R326
C323 C324
4.7k
C322 0.01 0.01
0.01
T5VS
S5V
SCLK
IC331 EW-460
R336
100k SDATA
I O
G
BTYPE
IC341
BU4094BCFV
EXSTB 1
STR VDD
SDATA 2
D QE
SCLK 3
CLK Q5
CTFIS 4
Q1 Q6
5
SRXMS
Q2 Q7
6
DETMS
Q3 Q8
7
CKSIS
Q4 QS
8
VSS QS
VCC
T5V
V5V Q47 XP6501
S5V 4 3
R19
470
5 2
6 1
R17 R18
C17
1k
100 1.5
R47
2.2k
C16
4.7
PLLIN
S5V
R20
1k
R16 C19
56 0.001
C14
R21
0.001
10k
Q3
2SK880
C21 R22 C20
0.001 8.2k 0.001
S5V
CP1
LVINV
LVINV
PLLIN
R5V
R232
47
IF5V
R231 X231
3.3k
CDBC450CX24
C231
IC231 TA31136FN
0.001
C232
1 100p
16
OSCIN MIXIN
2 15
OSCOUT GND
3 14
MIXOUT N-REC
4
13
VCC N-DET
5 12 RSSIV
IFIN RSSI
6 11
DEC IFOUT
7 10
FILOUT QUAD
8
9
FILIN AFOUT
C245 RSSIV
0.001
R244
C241
2.2k
R239 220k C239 C240 0.1
4.7 0.001
R242 R245
390 47k
C238 DET
120p
R241 C242 C243 C244 R246 C246
47k 470p
6.8k 0.001 0.001 0.001
VCOS
TDETV
S5V
SDATA
M5V
SCLK
VSSTB VSSTB
C327
4.7
S5V
SCLK
SDATA
RXOUT
RXIN
MICO
C387 R385
1 3.3k
SMICO
16 M5V
15 EXOE
14 C397 C396
1
13 VCOS VCOS 1
12
TXMS
11 ATTS
10
9 C341
0.01 C389
0.01
CKSIS
11 - 1
VCC
T5V
L47
0.47µH
V5FV
V5FV
C47 C48 C49
C55
10 10 22p
470p
VCO CASE
R31 L31
10 0.47µH D33 D31
HVC350B HVC350B
DO1
DO1
R34 L33 L32 D34 D32
W40
10 0.47µH 67nH HVC350B HVC350B
D37 D35 C33 R32
HVC350B HVC350B 39p 1k
L51
92nH
R33 C32
D38 D36
HVC350B HVC350B 1k 9p
L34
C51 C53
92nH
0.75p 22p
DO2
C52
6p
D39 C37
R37
1SV245 1.5p
100k
R35 C36
R38
1
180k 47k
R36 C34
R39 C35
47k 0.001 100k 470p
VCOS
PLLIN
R5V
TX: 0.0V R214 C215
RX: 3.78V 470 0.001
C217 R216
C216
31.05 MHz
100p 680 0.01
R215
120k
R213
Q211 1.5k
2SC4215
NOISV
RSSIV
C247
0.001
Q232
2SC5107
A
RSSIV
NOISV
VCOS
B
S5V
S5V
9 8 7 6 5 4
10 3 SDATA
SDIN
SCIN
11 2
X
LD/LTH
12 IC381 1 1 MHZ
AT X/CLK 1 MHZ
13 24 S5V
VSS FX214LG VDD
14 23
IC LFO/P
15 22 TXIN
RXOUT
TXIN
C381 16 17 18 19 20 21
C383
1
1
C382
1
C384 R381 R382 C385
0.1 10k 56k 0.1 TXIN
R384 C386
18k 1
IC382
NJM2904V
1 8 S5V
2 7
3 6
4 5
C388
0.01
R383
R386
100k
100k
AG3V
CKSIS
C