Icom IC-91A Service Manual page 44

SECTION 12 VOLTAGE DIAGRAMS
12-1 LOGIC UNIT
LOGIC UNIT
J200
C200 1
C201
1 C202
C203 1
1 C204
1 R66
C205
2.2
C206
2.2
C207
2.2
C208 CLIN
2.2
to LCD
D51
LCDDT LCDDT
MA2S111
LCDCK LCDCK
LCDRS LCDRS
LCDRES LCDRES
LCDCS LCDCS
R213
100K
C1
0.1
R401
47K
C2 TXCK 75
0.1 PF0/BREQ/IRQ2
R11 TXDT 74
PF1/BACK/BUZZ
12K RXDT 73
PF2/WAIT
RXCK 72
PF3/LWR/ADTRG
DCEL 71
PF4/HWR
ACQ 70
PF5/RD
CLSFT 69
PF6/AS
68
PF7
MD2
D103 67
MD2
MA2S077 66
C15 22P R9 10 FWE
65
EXTAL
64
VSS
X1 CR-774
63
XTAL
R14 62
C16
VCC
0.1 12K C3 61
R10 1M
0.1 STBY
60
NMI
RESET 59
RES
C14 58
C13
OSC1
10P 15P 57
OSC2
56
MD1
55
MD0
1.60Vp-p 54
AVCC
53
VREF
52
P40/AN0
51
P41/AN1
C4
0.1
J400
AMBECLK
R13
100K
AMBERES
DCEL
AMBESTB
RXDT
AMBEEPR
RXCK
+3V R2
TXDT R1 1K
C5V 1K
TXCK
to CODEC
DMOD
unit J1
ACQ
C6
AMODIN
C5 0.001
DVC
0.001
DAFOUT
AMBETXD
BTONE
C11
AMBERXD
0.001
FLASHV
MD2
CP402
RESET
CP408
MC300
EM-140
S4
S2 S3
MENU
MAIN BAND
S6 S7 S8 S9
S5
2 3 * VFO
1
S12
S10 S11 S13 S14
6
4 5 0 MR
S15 S17 S18
S16 S19
9 CALL
7 8 #
IC52
MAX3221IPWR
C63
0.22
16 1
FORCEOFF READY
15 2
VCC C1+
C62 14 3
EP50
GND V+
0.1 13 4
T1OUT C1-
12 5
FORCEON C2+
11 6
T1IN C2-
10 7
INVALID V-
9 8
R1OUT R1IN
C66
0.22
0
R63
100
C56
0.001
R55
47K
D201
Q200
D50 MA2S728
MA2S111 UNR9215J
TXC
R56 1K
D53
MA2S728
C209
0.001
CLOUT
BLED
Q50
2SD2216J
Q201
C210
UNR9215J
0.001
C57
22P
IC100
3.35V
R1150H022D
1
VOUT VDD
2
GND
3
CD VDET
R101
100K
TX232
RX232
C104
C103
R12 0.1
CVCC 10 10
D_AS
TXC
MICC
C107
0.001
C12
0.1
PCON
R57
47K
1 BLED
PE5/D5
2 LIGHT
PE6/D6
3 KR0
PE7/D7 R58
4 KR1
1K
PD0/D8
5 KR2 CPUHV
PD1/D9
6 KR3
PD2/D10
7 KR4 C59
C58
PD3/D11
0.001 0.001
8
PD4/D12
9 BATT
PD5/D13
10 ESIO
PD6/D14
11
IC1 ECK
PD7/D15
12
HD64F2238RTF13V CVCC
13 KS0
PC0/A0
14
VSS
15 KS1
PC1/A1
16 KS2
PC2/A2
17 KS3 IC51
C55
PC3/A3 24LC512T-I/SM
18 I0 0.001 R50
PC4/A4
19 I1 47K 8
PC5/A5 VCC
20 I2 7
PC6/A6 WP
I3 ECK
21 6
PC7/A7 SCL
PTT ESIO
22 5
PB0/A8/TIOCA3 SDA
23 SQL
PB1/A9/TIOCB3
24 IOSTB1
PB2/A10/TIOCC3
25 DIUD
PB3/A11/TIOCD3
LIGHT
CHGH
CHGC
R8
TXC
47K
C53
0.001
Q53
ANOIS UNR9115J
BNOIS
DICK
IOSTB2 C52 1
0.001
2
3
R6 1K BRSSI TTEMP 4
R5 1K VOL 5
R3 1k ATONE 6
R4 1k S-LV 7
BATT
TEMP
VIN
C54
0.001
Q300 RX: 0V
TX: 3.35V
UNR9115J
MICC
IC2
SN74AHC1G08DCK3
C300 C301
4 3 0.001 0.01
2 RX232
5 1 POWER
S1
POWER
C17
0.1
KR4
KR3
KR2
KR1
KR0
I3
I2
I1 INTPTT
I0
Q301
UNR9215J
KS3
D1
MA6S121
KS2
KS1 EXTMIC
KS0
D13
MA132WK
[USA], [AUS],
D15
[KOR], [TPE] MA2S111
[KOR], [TPE]
C64
0.22
C65
0.22
EP51
R62 100
EP52
L100
EP101 100U
D101 IC101
RB551V XC6371A551PR
C116 C114
3
DS201 22 22 LX
R200 2
CL-165HR VOUT
330 1
VSS
HR
R201
YG
330
7.34V
D102
MA2S111
5
4 C101
C100
0.1 R100 0.001 R153 R152 R151 R150
2.2K 8.2 10 12 12
C150
0.001
Q100 Q152
R154 Q150
Q101 2SB1132 UNR9211J
D100 1K 2SA1362
XP1501
MA2S111
Q151
3.37V 2SB1201
D150
C151
R103 MA133
0.001
10K
C110 C111
0.001 22 Q153
C108
R155 1K
22 XP1501
R156
C152 1K
0.001
C112
D152
0.001
R158 R157
SB07-03C
330
1.5K
R159
100K
Q51
D52
2SD2216J R60
MA2S111
10K
C153
R160
0.001 22K
R59 C60 R61
4.7K
0.001 2.2K
R202
4.7K
R105
100K
1 Q203
A0
2 R106 XP1501
C212
A1
22K 0.001
3 1 5
A2
4
VSS LED ON: 3.22V
Q202
C211 2
2SB1132
0.001
R203
3 4
330
R204
560
C213 C214
Q52
R205
4.7 0.001
UNR9115J
1k
R206
C51 R64
1k
100K DS210
0.001 R52
R211 180
SML-A12MT
NTCG16
R207
560
R212 180
R208
14 C50 R53
I/O1 VDD
47K DS211 560
13 0.001
O/I1 CONT1 SML-A12MT
12
O/I2 CONT4
R209
11
I/O2 I/O4 560
10
CONT2 O/I4 R65 1k
9
CONT3 O/I3 R210
8
330
VSS I/O3
IC50
CD4066BPWR
IC300 R348
C329
C313
AN6123MS R314 100 0.001
0.1 220K
1 5
OUTPUT
VCC
4
GND
2 3
DET INPUT
C314
0.1
R313
C312
1M 0.01
R326
220K
IC301
C317
R302 R303
R347 SN74AHC2G53HDCT3
0.1
100 3.3K 0
R304 1 8
COM VCC
100K C318 C319
2 7
0.056
C303 INH Y0 0.047
3 6
0.1 R346 GND Y1
4 5
GND A
18K C305 Q302
C302 0.1 R318 R323
2SC4081
0.001 R305 0 15K
47K
Q305
R307
2.2K UNR9215J
R301
1K
RX: 0V
C322
TX: 1.06V
0.001
C320
0.001
Q306
Q304 UNR9215J
R308
C321
470 UNR9115J
0.001
C324
1
C308 C353
0.001
1
R309 Q309
10K
UNR9215J
R352
R319
R311 2.2M
150K
2.2K
Q303
2SB1462J
R310
C309
1K
0.001
DTCS ON/OFF: 3.16V
C327
R320 C326
0.0033
R312 C310 4.7K 0.1
220K
0.047
R321
1k
C328
0.01
IC560
XC6202P502PR 5.07V
I O
MUTE ON: 0V
7.39V OFF: 6.07V
G
Q105
C132 C131 C130
2SB1132
R111 27
0.47 1 1
C119 C122
R112 27
5.53V 0.001 0.001
EP100
R113 27
Q106 R114
XP1501
C121 10K
C113 C115
22 10
33
R117 47K
C127 C126
R118 0.001 1
C128 C125
1M 0.001
0.001
CK
VCC
DATA
HV MOD
+5.5V
SQL
PLLDATA
APLLSTB
TXC
REFMOD
IOSTB1
BPLSTB
DASTB1
BPS
+3V UNLK
IOSTB2
CHG ON: 9.26V TTEMP
OFF: 0V IOSTB3
CHG
AMODIN BTONE
DMOD DAFOUT
ATONE
INTPTT
S-LV
VOL
BRSSI
DICK
BNOIS
DIUD
ANOIS
CLONE
C352 R349
R350
0.018 1.5K 2.2K
EXTMIC
R501
1M
R503
1M
C346
OFF: 0V
10
C348
1
DS202
SML-512MW
IC303
M62364FP
DS203
SML-512MW 1 24
VIN1 VIN8
2 23
VOUT1 VOUT8
DS204 3 22
VOUT2 VOUT7
4 21
SML-512MW
VIN2 VIN7
5 20
VDD GND
DS205 6 19
LD RESET
SML-512MW C344 7 18
CLK VDAREF
0.001 8 17
DI DO
DS206 9 16
VIN3 VIN6
SML-512MW 10 15
VOUT3 VOUT6
11 14
VOUT4 VOUT5 C345
DS207 12 13
VIN4 VIN5 0.001
SML-512MW
DS208
SML-512MW
DS209
SML-512MW
C510
0.1
R324
15K
R327
100K
R328
100K
R325
IC302
15K R344
LMV324IPW
470K
3.29V 1 14
2 13
3 12
R343
4 11
100K
5 10
6 9
7 8
R345
2.2K
R331 150K
C342
C331 180P
390P
R341
68K
C332 R332 R342
0.068 C350
470 39K
0.001
R334
82K
R333
C333
2.7K
1
C334
0.0027
R336
82K
Explanatory notes
C338
R340 10
R339 R338
3.9K 39K 10K
C339
C340
0.033 0.068
R337
39K
Q307
C341
UNR9215J
0.001
12 - 1
J50
DATA
EP53
IC550
NJM2070M
R553 C551
8 8 1 1
1k 0.1
7 7 2 2
6 6 3 3
C123 5 5 4 4
0.1 R552
8.2K C550
0.0047
R550
33
C553
1.5
J401
R601 1k CK
VCC
R602 1k DATA
MOD
+5.5V
SQL
R603 1k PLLDATA
HV
R604 1k APLLSTB
TXC
REFMOD
IOSTB1
BPLSTB
R605 1k DASTB1
BPS
UNLK
IOSTB2
TTEMP
IOSTB3
to MAIN
CHG unit J702
BTONE
DAFOUT
ATONE
INTPTT
+3V
S-LV
BAF BAF
VOL
BRSSI
DICK
BNOIS
DIUD
ANOIS
CLONE
AAF AAF
INTSP INTSP
AFO AFO
EXTMIC
SP1
INTSP CP400
+
GND
-
CP401
R500 C506
1
10K
R506
10K
R507 C505
47
10K
C509
1
R502
10K
R508
10K
DATA
CK
DASTB2
R504 R505
0 2.2K
BEEP
R509
1K
Q308
UNR9115J
D_AS
IC304
CD4066BPWR
14 1
I/O1
VDD
13 2
O/I1
CONT1 DV RX: 0.05V
12 3
CONT4 O/I2 TX: 0.07V
11 4
I/O4 I/O2 FM RX: 3.13V
10 5
O/I4 CONT2 TX: 3.16V
9 6
O/I3 CONT3
8 7 C347
I/O3 VSS
0.001
C349
0.001 R351
100K
VOLTAGE LINE
TX LINE
RX LINE
COMMON LINE