Service manual
FO-DC550 CIRCUIT DIAGRAM 14 - 31
4. FAX MAIN PWB
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
FAX MAIN PWB (TEL/LIU) 1/6
Primary side Secondary side
L1
L2
(2125)
ABITCLK
ASPCLK
ARXD
ATXD
AFERST_L
SPOUT
MCLOCK
RGDT-
CID_L
EXHKD_L
S
DAAGND
DAAGND
+3.3V DAA3.3V
DAAGND
DAAGND
DAAGND
DAA3.3V
GND
DAA3.3V
DAA3.3V
DAAGND
+24V
GND
GND
PG
GND
DAAGND
C9
B0.1u/16V
VA1
DSS401M(N,M.)
ZD4
HZS2A1
SA3
DSS-401M
C1002 B0.1u/16V
C13
B1uF/16V
R1028 5.36kF 1/4W
TPGND 0R(N.M.)
R1014 5.36KF 1/4W
C5
2200pF(KH)
R1000
10K
PC1B
TLP621
43
R1015 5.36KF 1/4W
R1013
120K
C10
150p/AC250V
SA1
DSS-401M
IC1
Si3015-FS
1
2
3
4
5
6
7
89
11
12
13
14
15
16
10
QE2
DCT
IGND
C1B
RNG1
RNG2
QB
QEVREG
REF
REXT2
REXT
RX
FILT
FILT2
VREG2
R5 215F(1608)
R30
30 1/4W
C1 B0.22u/10V
FB1
BLM31A601S
C12
B0.022u/250V
D4
1SS355
FL4
ST110AV
C11
(3216) N.M.
C14
B0.22u/16V
R1021
56k 1/10W
R1017
150(1608)
R4
10 1/10W
R29
91 1/4W
C1008
B3900p/16V
R1003 402F(1608)
R1027 5.36kF 1/4W
R28 1.78kF 2W(N.M.)
R11
100kF(1608)
R1 0R(N.M.)
C25
B1000p/50V
H1
R1029
0R (1608)
SA2
DSS-401M
L6
SBT-0260
C1007
B3900p/16V
R14
10M
D2
DAN217
A
AK
K
C1006
B0.1u/50V
C26
0.47uF/250V
C4
2200pF(KH)
D1
DAN217
A
AK
K
C2
10pF/50V
C1003 B0.68u/16V
Q1001
2SC4548(E)
B
E C
Q2
2SD1733
1
34
R1002 9.31kF(1608)
FB3
BLM31A601S
C1005
B0.01u/50V
ZD2
MTZJ30B
PC2A
PC814X
1 2
L1
TWKA-221KNP
IC2
Si3021-FS
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
MCLK
FSYNC
SCLK
VD
SDO
SDI
FC/RGDT
RESETAOUT
M1
C1A
GND
VA
M0
RGDT/FSD
OFHK
R3
10 1/10W
R45
10K
R1019 5.36kF 1/4W
C1004 B1800p/50V
Q3
DTC123JKA
B
E
C
L2
TWKA-221KNP
C27
B1000p/50V
R1022
0R(N.M.)
ZD1 RLZ5.6
C6
1000p/AC250V(NM)
R1023
0R(N.M.)
R1016 5.36KF 1/4W
R1117
N.M.
MJ2
MJ-62J-RD315/MJ-66J-RD315
1
2
3
4
5
6
BT1
LT1
TEL1
TEL2
LT2
BT2
D1000 1SS355
R27
10k 1W
R7
0R
R10
0R
RY1B
OUAZ-SH-124DZ
5 4
+-
L3
SBT-0260
R1001 78.7F(1608)
L4
SBT-0260
ZD1001
RD43FM
C7
1000p/AC250V(NM)
FB2
MEM2012(N.M.)
1 3
2
R1020
56k 1/10W
Q1
2SC4548(E)
B
EC
C15B0.01u/250V(N.M.)
C1009
B560p/250V
RY1A
OUAZ-SH-124DZ
1 2
3
Q1000
2SA1759
B
E C
L5
SBT-0260
D3
S1ZB60
12
3 4
R12 1.78kF 2W(N.M.)
MJ1
MJ-62J-RD315/MJ-66J-RD315
1
2
3
4
5
6
PC2B
PC814X
43
ZD3
HZS2A1
C1000
1000pF
C1001 B0.1u/16V
C1011
B560p/250V
R1018
2.2K 1/10W
C3
150p/AC250V
PC1A
TLP621
12
ZD1000 RLZ5.6
R13 10M
Secondary side