Oki B4100 - Manual (Page 258)

40055101TH Rev.4 258 /
(3) No 5 V output
To flowchart (6)
no heater output.
Replacement
Replacement
1. D1 to D4 short circuit
2. C6 short circuit
1. Q1 short circuit
2. Q3 short circuit
3. R9 open circuit
4. Check the output line
and load if the overcurrent
protection circuit is operated.
5. ZD4 short circuit
End
Start
Isn't fuse F1 blown?
Isn't fuse F2 blown?
Is the output wave-
form at VCE of Q1 as
shown in Fig. 1?
(page A3-49)
No
No
No
Yes
Yes
Yes