Kyocera TASKalfa 620 Service Manual page 195

(21) There is a regu-
lar error
between the
leading edges
of the original
and copy image
when the DP is
used.
See page 1-4-57
(1) No image appears (entirely white).
Copy example
No transfer
charging.
No LSU
laser is out-
put.
No develop-
ing bias is
output.
(22) A line appears (23) A line appears
at the leading or
trailing edge.
70 mm
See page 1-4-57
Causes
The connector terminals
of the transfer high volt-
age PWB make poor
contact.
Defective engine PWB.
Defective transfer high
voltage PWB.
Defective laser scanner
unit.
Defective main PWB.
Defective engine PWB.
Defective high voltage
PWB.
periodically.
64 mm
64 mm
64 mm
See page 1-4-57
Check procedures/corrective measures
Reinsert the connector. Also check for continuity within the
connector cable. If none, remedy or replace the cable.
Check if YC6-11 on the engine PWB goes low when main-
tenance item U101 is run. If not, replace the engine PWB.
Replace the transfer unit (see page 1-5-49).
Replace the laser scanner unit (see page 1-5-36).
Check if YC1-14 on the main PWB goes low when mainte-
nance item U101 is run. If not, replace the main PWB.
Check if YC7-5 and YC7-6 on the engine PWB go low when
maintenance item U101 is run. If not, replace the engine
PWB.
Check if developing bias voltage is output when the engine
PWB is normal while maintenance item U101 is run. If not,
replace the high voltage PWB.
2KN/2KP
1-4-51