1-5-25
(1) No image appears (entirely
white).
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.
Causes
Check procedures/corrective measures
1. The LED print head has not done func-
tioning.
A. Defective FFC connection to the LED
print heads relay PWB.
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].
B. Defective FFC connection to the LED
print head.
Check the FFC connection to the LED print head. See page 1-6-15 [18].
C. Defective main controller PWB.
D. Defective LED print heads relay PWB.
Replace the LED print heads relay PWB (A0008). See page 1-6-44.
2. Defective developing sleeve bias or
developing magnet bias output.
A. Defective engine controller PWB.
Replace the engine controller PWB (A0004). See page 1-6-41.
B. Defective main high voltage PWB.
Replace the main high voltage PWB. See page 1-6-45.
3. Defective secondary transfer bias output.
A. Defective engine controller PWB.
Replace the engine controller PWB (A0004). See page 1-6-41.
B. Defective bias high voltage PWB.
Replace the bias high voltage PWB. See page 1-6-46.
4. Malfunction of the developer installation.
Reinstall the developer. See page 1-6-12.
(2) No image appears (entirely
black).
Causes
1. No main charging.
2. Defective LED print heads relay PWB.
Causes
Check procedures/corrective measures
1. No main charging.
A. Poor contact of output terminal of main
high voltage PWB.
Check the installation of the main high voltage PWB, If it installation
incorrectly, reinstall it. See page 1-6-45.
B. Defective main high voltage PWB.
Replace the main high voltage PWB. See page 1-6-45.
C. Defective engine controller PWB.
Replace the engine controller PWB (A0004). See page 1-6-41.
2. Defective LED print heads relay PWB.
Replace the LED print heads relay PWB (A0008). See page 1-6-44.
Replace the main controller PWB (A0010*
1
/A0011*
2
). See page 1-6-40.
*1
: 16 ppm printer,
*2
: 24 ppm printer
2F3/2F4-3.0
Содержание C5020N - FS Color LED Printer
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