Lexmark C520 Series, Service Manual

Page: 104 / 259

2-46
Service Manual
5022- xxx
920.09-12—POST (power on self test) error service check
Step Questions / actions Yes No
1 Turn the printer off and remove the rear
cover. Check connector JHVPS1 for proper
connection to system card, cable for pinch
points and cable or connector for any other
damage. Is cable properly connected and
damage free? Go step 2. If connector is damaged on
system card, replace
system card. Go to
“System card removal” on
page 4-47
. If HVPS1 cable
is damaged, replace top
access cover assembly. Go
to
“Top access cover
assembly removal” on
page 4-23
.
2 Remove left cover. Go to “Left cover
removal” on page 4-20 . Check all toner
level sensor cables connected to the rear of
the HVPS for proper connection to HVPS,
cable for pinch points and cable or connector
for any other damage. Are connectors
properly connected and cables and
connectors damage free?
Go to step 3. Properly connect toner level
sensor cable if not properly
connected. If sensor cable
or connector is damaged,
replace sensor. Go to
“Toner level sensor
removal” on page 4-58
. If
connector is damaged on
HVPS, replace HVPS. Go to
“High volt power supply
(HVPS) removal” on
page 4-55
.
3 Disconnect JHVPS1 from system card and
HVPS. Check for the following continuity.
JHVPS1 cable
HVPS end
System card end
pin 14 pin 14
Is continuity present?
Go to step 4. Replace top access cover
assembly. Go to
“Top
access cover assembly
removal” on page 4-23
.
4 Reconnect JHVPS1 cable to system card
and HVPS. Do not reinstall left cover, but
ensure that front access door and top cover
assembly are closed and that the waste
toner assembly is reinstalled. Turn printer
on. Attach the negative end of the voltmeter
to the ground and check the voltage on pin 1
of each toner level sensor cable. You will
need to check this on the back of the HVPS
(see illustration below). Is there
approximately 5 Vdc on any of the pins? Replace toner level sensor
that has 5 V dc on pin 1. Go
to
“Toner level sensor
removal” on page 4-58 .
Go to step 5.