Samsung ML-1665 Service Manual page 78

Alignment and Troubleshooting
7) Background
Description : Light dark background appears in whole area of the printing.
1. Does character exist less than
The toner cartridge is basically
2% per a page, and has not it been
designed to print 1,500 sheets
used long time?
with 5% image.
The A/S is not guaranteed if using
2. Does recycle paper be used?
recycle paper.
3. Has the life span of the Replace the developer when the
life span of it has been ended.
developer ended?
Clean the bushing part of the
4. Is the movement(Up and Down)
transfer roller.
of the transfer roller smooth?
If the problem is still not solved,
5. Is the HVPS normal?
replace the developer.
4-30
Service Manual
Samsung Electronics