Toshiba e-STUDIO500P Service Manual page 157

Print quality—light print
Service tip: Check the toner saver and print darkness settings first if the print is light.
FRU
1 Transfer roll
2 Right side transfer roll arm
assembly
HVPS
3
Printhead
Print quality—toner on backside of printed page
Service tip: This is generally caused by loose toner in the machine in the paper path being carried through the
printer on the backside of the paper.
FRU
1 Hot roll fuser assembly
2 Transfer roll transfer plate
assembly
Action
Check the right end of the transfer roll shaft for signs of wear or
contamination. If incorrect, replace the transfer roll.
Check the right side transfer roll arm assembly bearing for wear or
contamination. Also make sure the transfer cable is firmly attached to
the bearing. If incorrect, replace the right side transfer arm assembly.
Check the connection of the transfer roll assembly cable to the
transformer on the HVPS board. Check the continuity of the cable
from the bearing to the spade terminal on the cable. If incorrect,
replace the right side transfer arm assembly. If correct, replace the
HVPS.
A contaminated printhead may be the cause of light print. If no other
cause is found, install a new printhead.
Action
Toner is being carried out on the backside of the media. This problem
is generally caused by a toner buildup on the fuser hot roll or backup
roll. Check the fuser hot roll and backup roll for any noticeable
buildup of toner. Repair as necessary.
Check the transfer roll for toner buildup or loose toner around the
area of the transfer plate assembly. Clean the area and run another
copy. If the problem continues, replace the FRUs in the following
order:
• HVPS
• System board
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Diagnostic information