Oki C9200 Service Manual page 118

1 Light or blurred images or images in inappropriate color tone on the whole printout area
• Is toner low? (Is the message "Toner Low" displayed?)
Yes Supply toner.
• No Is the specified paper used?
No Use the specified paper.
• Yes Is the lens of the LED head dirty?
Yes Clean the LED head lens.
• No Is each LED head assy connected properly to the junction board (Y71 PWB) and engine
board (K73 PWB)?
No Check the cable connection (between each LED head and the engine board) and connect
the cable between the LED head and the engine board properly.
• Yes Is +3.8V supplied to the following POWER connector pins on the junction board(Y71 PWB)?
+3.8V: Pins 1, 2, 3, 4, 5, 6, 7 and 8
• Yes Is +3.8V supplied to each LED head assy from the junction board (Y73 PWB)?
YPOW connector Pin 3: LED head assy yellow
MPOW connector Pin 3: LED head assy magenta
CPOW connector Pin 3: LED head assy cyan
BPOW connector Pin 3: LED head assy black
No Replace the junction board (Y71 PWB).
• Yes Check the cable connection, or replace the LED head assy.
• No Check the cable connection, or replace the low-voltage power supply unit. Recovered?
Yes End
• No Is +32V supplied to the POWER connector pins on the engine board (K73 PWB)?
+32V: Pins 7, 8, 9 and 10
No Check cable connection, or replace the low-voltage power supply unit.
• Yes Is +32V supplied to the HVOLT connector Pin 5 on the engine board (K73 PWB)?
No Replace the engine board.
• Yes Check the cable connection, replace the high-voltage power unit, or belt cassette assembly.
Recovered?
Yes End
• No Is each ID terminal connected correctly to the contact assembly? (See Figure 6.3.)
No Connect the ID terminals with the contact assembly correctly.
• Yes Replace the ID unit.
Notes: 1. When replacing the engine board (K73 PWB), demount the EEPROM chip from the old
engine board and remount it on the new one.
2. In case the EEPROM chip is not replaced, see Item (2) in Sec. 6.5.2.
41388601TH Rev.2
(Figure 6.2- A )
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