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Print Quality - Blank Page
FRU
1
Printhead
Cable
2
Transfer
Corona
3
Print Unit
4
• Contact
Springs
• HVPS
5
• Engine
Board
• HVPS
• Intercon-
nect Board
Action
Generally a 935 Printhead Error is posted if the
printhead assembly fails. Check the connection of
the printhead.
Check the transfer corona for correct installation or
signs of damage. Clean the transfer wire with the
cleaning tool provided with the printer. Check the
contact spring that connects to the transfer corona
for damage, pitting, or debris. Replace the transfer
or center paper feed frame, which contains the
spring, if necessary. Also see the
Service Check" on page
Check the print unit for any signs of damage, espe-
cially the PC drum and contacts. Also check the
precharger wire for damage. Clean the wire with
the cleaning tool provided with the printer.
Check the HVPS contacts on the HVPS board and
the mating contact springs on the left side of the
printer for pitting or incorrect alignment. Cables
from the pick roller and cover open switch could
also be in the way of the contacts.
Check the voltages on the engine board at the fol-
lowing locations;
Printer Idle:
CNMC-B10 = +24 V dc
CNMC-B11 = +17 V dc
CNMC-A11 = +20.5 V dc
CNMC-B12 = +0.1 V dc
Printer Printing:
CNMC-B10 = +0.1 V dc
CNMC-B11 = +0.1 V dc
CNMC-A11 = +0.1 V dc
CNMC-B12 = momentarily jumps up to 5 - 15 V dc.
If these voltages are not correct, replace the engine
board. If they are correct, replace the following
FRUs in the order shown:
1. HVPS
2. Interconnect Board
"Transfer Corona
2-29.
Diagnostic Information 2-15
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