All-Black Printout; Control Pwb 2 - Kyocera FS-1028MFP Service Manual

(1) Completely blank printout.
Print example
Connection failure with DP connector
(Only when the option DP is installed)
Defective drum unit or developing
unit.
Defective transfer bias output or
developing bias output.
Poor contact of developing bias termi-
nal (spring) and high voltage output
terminal B (J401, J402, J403) on the
high voltage PWB.
Poor contact of transfer bias terminal
(spring) and transfer bias terminal T
(J201, J202, J203) on the high volt-
age PWB.
Defective laser scanner unit.
Defective control PWB.

(2) All-black printout.

Print example
Defective main charger unit.
Poor contact of main charger terminal
(spring) and main charger output ter-
minal M on the high voltage PWB.
Defective main charging output.
Broken main charger wire.
Defective control PWB.
Causes
Causes
Check procedures/corrective measures
If a blank copy is made because the original loaded in the DP
is not fed after the Start key is pressed:
Turn the main power switch off, investigate the DP connector
connection, and firmly connect the DP connector.
DP connector
Open the front cover and check that the drum unit and devel-
oping unit are correctly seated (See page 1-5-30 and 1-5-29).
Investigate that the terminals between the main charger unit
and the drum unit are not in loose contact (See page 1-5-31)
Replace the high voltage PWB (See page 1-5-45).
Check the high voltage PWB visually and correct or replace if
necessary (See page 1-5-45).
Replace the laser scanner unit (See page 1-5-17).
Replace the control PWB (See page 1-5-39).
Check procedures/corrective measures
Open the front cover and check that the drum unit and devel-
oping unit are correctly seated (See page 1-5-30 and 1-5-29).
Investigate that the terminals between the main charger unit
and the drum unit are not in loose contact (See page 1-5-31)
Check the high voltage PWB visually and correct or replace if
necessary (See page 1-5-45).
Replace the high voltage PWB (See page 1-5-45).
Replace the main charger unit (See page 1-5-31).
Replace the control PWB (See page 1-5-39).
2H9
DP
1-4-11