Troubleshooting
6-6
SF150T
6-3. System Not Initialized
N
NG
N
N
NG
OK
N
N
N
Step motor driving
Start
Y
Y
Y
Y
OK
NG
Y
Y
See Section 6-2-2
Replace P5 Harness
or OPE PBA
Replace U3
Replace U7
Fax Engine IC
Replace U7
Fax Engine IC
Replace Main PBA
Replace U14
Motor Driver
Replace
X2 XTAL
Check
U3 Pin 5
= "High"
Check U3 Pin 6
(above +2.25 V)
Check
P5 Harness or OPE
PBA
Check 12 MHz
Clock U7-37
Check 24 MHz
Clock U7-129
O.K ?
O.K ?
Check
Vcc ³ 4.75 V
P1-4 (+5V)
P1-3 (GND5)
End
End