Kyocera TASKalfa 620 - Page 195

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