UX-B20U/UX-B20C/B25C
6 – 1
FAX
UX-B20U/UX-B20C/B25C
Service Manual
Service Manual
Market
E
CHAPTER 6.
CIRCUIT SCHEMATICS AND PARTS LAYOUT
[1] Control PWB circuit
1. Main Control Block (1/8)
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
6
6
5
5
4
4
3
3
2
2
1
1
D2
D0
D5
D6
D3
D7
D4
D1
A18 A17
A11
A13
A1
A2
A14
A16
A0
A10
A6
A8
A4
A7
A5
A3
A12
A9
A15
SEN6
SEN5
SEN4
E
N
ABLE
CNPN
-13
PCL
K
CNPN-3
GAC
S
-
FL
C
S
-
INT
CNPN-4
EN
ABLE
CL
O
C
K
CN
C
IS
-4
DW
R
-
PDAT
CNPN
-14
WR
-
CAS-
ROM
C
S
-
VIN
BZO
UT1
CNPN
-12
PLAT
RD-
C
NCIS-5
CNPN
-11
CNPN-1
D
[7:0]
RAS-
CNPN-2
SCANSYNC
A
[18:0]
CNPN
-16
CNPN
-15
CNPN
-10
CNPN-9
DG
DG
DG
DG
+3.3V
DG
DG
+3.3V
DG
DG
DG
DG
DG
+3.3
V
DG
DG
+3.3V
VBATn
DG
VBAT
DG
DG
DG
+5V
DG
DG
(4
-4
A
)
(4
-3A)
(2
-4A)
(2-3A)
<DG>
KEN2A
(4
-3A)
(2
-4G)
(2
-4G)
KEN1A
(7-3
E)
KEN4A
E
(4
-3A)
(2-3A)
¿T
(4-3A)
(4-3A)
<G>
(2
-4
G
)
(4-3A)
SEN2
SEN3
(4
-3A)
(6-5D)
CISC
LK
(2
-5A)
(2-4D)
(4
-3A)
(1-2
A)
(4-2A)
SEN1
SEN0
(2
-6
A
)
(1-1D)
C1
94
1u/10
V
C3
27
100pFx8
C32
2
C3
25
C
124 22
pF
RA
2
470
5
1
8
7
6
2
3
4
<D>
R1
31
220K
<F>
R1
28 68
C121
<H>
32.768KH
z
X1
R133
0
C3
23
RA
1
470
5
1
8
7
6
2
3
4
R2
05
R
130
10M
C5
1u/10
V
RA1
9
33
5
18
7 6
2 3 4
R
17
0
270
C1
27
C129
1u/10V
<B>
R2
02
33
<E>
C7
1u/10
V
C2
80
100pF
R1
21
33
C319
R2
00
33
C1
28
1u/10
V
C3
28
R
11
6
270
DG
C1
32
RA1
7
33
5
18
7 6
2 3 4
C6
1u/10
V
R2
01
33
C316
N.M.
R12
6
68
<M>
C28
1
15pF
C122
R
11
5
270
<I>
<A>
C3
0
1u/10V
C1
3
1u/10
V
C1
31
1u/10V
R122
470
C1
23
1u/10
V
C317
R11
8
10K
R2
8
0
IC13
1 2
4
5
3
R1
24
68
C1
C318
RA1
8
33
5
18
7 6
2 3 4
C120
R132
10K
<J>
R123
470
R12
0
33
C3
29
<K>
<CISCLK>
C13
0
1u/10V
<C>
C1
25
1u/10V
R1
19
33
C
133
1u/10
V
C15
3
100pF
C1
26
18
pF
C1
92
1u/10
V
C5
3
<L>
SCE209L
(1/2)
IC5
TEST0
33
TEST1
32
D0
141
D1
142
D2
143
D3
144
D4
145
D5
146
D6
147
D7
148
A23
140
A22
139
A21
138
A20
137
A19
136
A18
135
A17
134
A16
131
A15
130
A14
129
A13
128
A12
127
A11
126
A10
125
A9
124
A8
123
A7
122
A6
121
A5
120
A4
118
A0
114
A3
117
A2
116
A1
115
RD
6
WR
5
ROMCS
3
SYNC/GPO20
4
REGDMA/GPO18/CLKDIV0
175
WAIT/GPO19/CLKDIV1
176
RAS
25
CAS
26
DWR
27
WRPROT
31
BATRST
34
VBAT
28
PW
RDWN
36
IN
TPWRDOWNE
35
XOU
T
30
XIN
29
VREFp
44
VREFn
/C
LR
EF
39
VIN
40
THAD
I
49
ALTTONE(BZ)
149
OPI0
19
OPI1
20
OPI2
21
OPI3
22
SM0
171
SM1
172
SM2
173
SM3
174
OPO0
12
OPO1
13
OPO2
14
OPO3
15
OPO4
16
OPO5
17
OPO6
18
SXIN
10
SXOUT
11
CLK2
69
START
67
STRB0
57
STRB1
58
STRB2
59
STRB3
60
PCLK
63
PDAT
62
PLAT
61
VSS
165
VSS
133
VSS
107
VSS
70
VSS
50
VSS
45
VSS
9
VSSPLL
2
TSTCLK
8
RES
ET
108
DEB
UGn
7
VDD
PLL
1
VDD
166
VDD
161
VDD
132
VDD
119
VDD
64
VDD
48
VDD
24
IVRE
Fp
47
IVRE
Fn
46
ADXG
43
ADG
A
38
ADVA
42
LCDCS
23
VDD
97
CS3
54
FCS1
94
CS5
53
IR
Q15n
55
ADG
A
41
C3
26
<¿T>
C1
4
1u/10
V
RA1
6
33
5
18
7 6
2 3 4
R
11
7
270
R125
470
R17
3
33
R
17
2
100
C3
24
R12
7
33
N.M.
N.M.
TC7SET08FU
N.M.
N.M.
<CS5>
<CS5n>
<BATRST>
<BATRSTA>
N.M.
N.M.
Main
Control
Block
1/8
FAX
CONTROLLER
Summary of Contents for UX-B20
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