Lexmark T420, Руководство по обслуживанию

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Diagnostic Information
2-49
4048–00x
Printhead
Printhead Cable
HVPS
RIP Card Assembly
Cartridge Contacts Assembly Blank pages can be caused by a
defective printhead assembly, high
voltage power supply, or RIP card
assembly. See
“RIP Card Service
Check” on page 2-31 and verify the
required voltages and proper ground
at connectors J1 and J3.
With the cartridge removed and the
printer off, check continuity between
HVPS (DC designation on outside of
card) and the PC pin inside the
printer. The PC pin is directly above
the transfer roll gear.
If the voltages are correct, check the
printhead cable for continuity.
• If the cable measures continuity,
replace the printhead.
• If the cable does not measure
continuity, replace the cable.
See “High Voltage Power Supply
(HVPS)” on page 5-12 and verify
the voltages.
• If the +24 V dc and +5 V dc input
voltage measurements are
correct, replace the HVPS.
• If the voltages are incorrect,
replace the RIP card assembly.
Note : Always check printhead
alignment after replacing the RIP
card assembly. See
“Printhead
Assembly Adjustment” on
page 4-2
for hardware alignment
of the printhead.
FRU Action