HP 5000n manual Blank Spots

Table 7-11. Blank Page (continued)

Possible Cause	Action
DC Controller PCA is	Replace the DC Controller PCA.
defective. The DC
Controller supplies the
proper voltage to the
High Voltage Power
Supply PCA.
No Developing Bias.	1. Clean the High Voltage Power Supply contacts.
	With no Developing Bias charge, toner is not
	attracted to the drum.
	2. Replace the Engine Controller Board.

No drum ground path. With no ground path the drum cannot discharge. The negative charge on the drum repels toner, and leaves a white page with bubble print.

1.Check the drum ground.

2.Replace the Engine Controller Board.

Defective Laser	Low-level signals exchanged between the Laser
Scanner Cable	Scanner Assembly and the Engine Controller Board
Assembly.	may be affecting laser output. Replace the Laser
	Scanner Cable Assembly.

Table 7-12. Blank Spots

Possible Cause	Action
Paper does not meet	1. Print a few more pages to see if the problem
printer specifications	corrects itself.
or is stored	2. Turn over the stack of paper in the tray. Also try
improperly.	rotating the paper 180°.
	3. Check the paper (or other print media) type and
	quality. Replace the paper, and advise the customer
	to use the recommended paper and store it properly.
Defective Toner	Replace the Toner Cartridge.
Cartridge.

EN Troubleshooting the Printing System 7-55