Development power pack error 4: Y
An interrupt checks the status of
the each power pack every 2
ms. This SC is issued if the
BICU detects a short in the
development DC charge for
black, magenta, cyan, or yellow
(or V = 0) for 500 ms (250
times).
• Development power pack defective
• High voltage power supply defective
• High voltage power supply harness
defective
• Development unit defective
• IOB harness disconnected or defective
• IOB defective
1. Disconnect the high voltage cable from Terminal B of the high-voltage
supply board.
2. Attach a voltmeter to the terminal.
3. If there is no output from the terminal, replace the high voltage power
supply.
-or-
If there is output from the terminal, test the resistance between the high
voltage cable and the ground.
If resistance is "0" or nearly "0", check the high-voltage harness for defects
and replace it if necessary.
If replacing the harness does not solve the problem,
4. Test the resistance between the development unit terminal and the ground.
If there is no resistance (0Ω) between the development unit and the ground,
replace the development unit.
5. If there is no development PWM signal, replace the harness and/or IOB.
SC324 D
Development motor error 4: Y
The PLL lock signal remained
HIGH or LOW for longer than
the prescribed time for the
development motor of the
affected color.
• Development motor shaft locked, blocked
by and obstruction
• DRB (Drive Board) defective
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