Oki B 4100 Maintenance Manual page 257

Low-voltage Selection.
(2) No 5 V(S) output
Isn't fuse Fl blown?
Isn't fuse F2 blown?
Is the voltage across
C26 at 6 V or more?
Is the voltage across
C27 at 5.6 V or more?
40055101TH Rev.4
Start
No
Yes
No
Yes
No
Yes
No
Yes
End
To flowchart
(6) for no heater
output.
To flowchart
(3) for no 5 V
output.
Any of D11 to D14
Replacement
short-circuited
1. IC3 fault
Replacement
2. Short circuit at output end
257 /