Lexmark 4500-00 Series, Service Manual

Page: 117 / 246

Diagnostic information
2-87
4500
Black page
Note: Incorrect laser exposure or incorrect charging of the
photoconductor causes an all black page.
FRU Action
HVPS contacts Check the contacts for
contamination or incorrect
installation.
Check continuity between solder
points on the outside of the HVPS to
the contact tips at the print cartridge.
With the print cartridge in the printer,
check continuity from the solder
pads marked “C” (adjacent to fan) to
the clip inside the PC shutter. Then
check continuity from the left bearing
to the right bearing of the charge roll.
Replace the contacts or charge roll
assembly as necessary.
Engine board
LVPS board
Controller card
HVPS cable
HVPS Make sure the cable from the HVPS
to the engine or controller card is
correctly installed.
See “Engine board (E320/E322
only) ” on page 5-2 or “Controller
(E220/E321/E323 only) ” on
page 5-7
and check the voltage
measurements at J1 or J3
respectively.
• If the voltages are correct, check
the HVPS to engine/LVPS cable
for continuity.
• If the cable does not measure
continuity, replace the cable.
• If the cable measures continuity,
replace the HVPS.
• If the voltages are not correct, see
“Low voltage power supply
(LVPS) service check ” on
page 2-76
and “Engine board
service check (E320/E322) ” on
page 2-72
or “Controller card
service check (E220/E321/E323)
” on page 2-67
.