Kyocera FS C5020N - Color LED Printer Service Manual page 77

(1) No image appears (entirely
white).
Causes
1. The LED print head has not done func-
tioning.
A. Defective FFC connection to the LED
print heads relay PWB.
B. Defective FFC connection to the LED
print head.
C. Defective main controller PWB.
D. Defective LED print heads relay PWB.
2. Defective developing sleeve bias or
developing magnet bias output.
A. Defective engine controller PWB.
B. Defective main high voltage PWB.
3. Defective secondary transfer bias output.
A. Defective engine controller PWB.
B. Defective bias high voltage PWB.
4. Malfunction of the developer installation.
*1 *2
: 16 ppm printer, : 24 ppm printer
(2) No image appears (entirely
black).
Causes
1. No main charging.
A. Poor contact of output terminal of main
high voltage PWB.
B. Defective main high voltage PWB.
C. Defective engine controller PWB.
2. Defective LED print heads relay PWB.
Causes
1. The LED print head has not done functioning.
2. Defective developing sleeve bias or developing magnet bias output.
3. Defective secondary transfer bias output.
4. Malfunction of the developer installation.
Check procedures/corrective measures
Check the FFC connection to the LED print heads relay PWB. (Do not
attempt to disconnect/connect the FFC while power is on.) See page
1-6-15 [20].
Check the FFC connection to the LED print head. See page 1-6-15 [18].
Replace the main controller PWB (A0010*
Replace the LED print heads relay PWB (A0008). See page 1-6-44.
Replace the engine controller PWB (A0004). See page 1-6-41.
Replace the main high voltage PWB. See page 1-6-45.
Replace the engine controller PWB (A0004). See page 1-6-41.
Replace the bias high voltage PWB. See page 1-6-46.
Reinstall the developer. See page 1-6-12.
Causes
1. No main charging.
2. Defective LED print heads relay PWB.
Check procedures/corrective measures
Check the installation of the main high voltage PWB, If it installation
incorrectly, reinstall it. See page 1-6-45.
Replace the main high voltage PWB. See page 1-6-45.
Replace the engine controller PWB (A0004). See page 1-6-41.
Replace the LED print heads relay PWB (A0008). See page 1-6-44.
2F3/2F4-3.0
1 2
/A0011* ). See page 1-6-40.
1-5-25