Sharp FO-4450 - Troubleshooting; Problems and Solutions

FO-4450U/FO-CS1
Joint PWB
TONER
FAX1
FAX2
ON LINE
DATA
ALARM
ULTRA FINE
FINE
STANDARD
HALF TONE
SUPER FINE
LED PWB
(TO COG) (TO PANEL)
1
2
GND
1
5V
2
VO
3
RS
4
R/XW
5
E
6
LD0
7
LD1
8
LD2
9
LD3
10
LD4
11
LD5
12
LD6
13
LD7
14
1
2
1
2
1
2
1
2
1
2
1
2
GND
13
LED7
3
LED8
5
LED9
7
LED10
9
LED11
11
LED3
2
LED1
12
LED2
10
LED4
4
LED6
6
LED5
8
5V
1
TH2
15
TH1
14
1
2
1
2
GND
14
5V
9
VO
12
RS
11
R/XW
10
E
13
LD0
8
LD1
7
LD2
6
LD3
5
LD4
4
LD5
3
LD6
2
LD7
1
1
2
1
2
1
2
LED3
R1
150
CNCOGA
52030-1410
LED4
GL3EG44
R2
150
Q1 KRC102M
LED8
GL3EG44
R8
150
R3
N.M.
Q8 KRC102M
R9
150
LED1
GL3HD43
LED12 GL3EG44
R4
150
R10
150
R5
R11
150
LED5
Q9 KRC102M
LED9
GL3EG44
R7
N.M.
R6
Q11 KRC102M
CNLED
HLW15R-2C7
CNLED
Q2 KRC102M Q3
N.M.
Q4 KRC102M
RT1
N.M.
t
Q7
N.M.
Q6
N.M.
Q5
LED6
CNCOGB
52030-1410
Q10 KRC102M
LED2
GL3HD43
LED7
LED10 GL3EG44
+5V
DG
+5V
DG
DG
+5V
LED6
LED10
LED2 LED4
LED7
LED5 LED3 LED9
LED11 LED8
LED1
LED72 LED42 LED12 LED82 LED102 LED62 LED52 LED92 LED22 LED112 LED32
N.M.
A A
B B
C C
D D
E E
F F
G G
H H
6 6 5 5 4 4 3 3 2 2 1 1
Operation Panel PWB circuit 3/3
Note: Since the parts of this PWB cannot be supplied, change it as a unit.
6 – 29
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