Led Test - Oki OKIFAX4550 Maintenance Manual

7.11

LED Test

Start
Perform LED TEST. (See 6.8)
All LEDs light?
End
41309401TH Rev.4
No
Yes
Any LED does not light?
ALARM LED lights?
DARK LED lights?
NORMAL LED lights?
LIGHT LED lights?
STD LED lights?
FINE LED lights?
EX. FINE LED lights?
PHOTO LED lights?
No (No LED lights)
Yes (One LED or
some LEDs light.)
1. Check the connection cable.
2. Check the oscillator OSC (OPE).
3. Replace MCNT board.
4. If not solved, replace CPU of
OPE unit.
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Check the corresponding
LED(s) on OPE board.
Checking Points:
232 /