Lexmark T 430, Service Manual

Page: 73 / 249

Diagnostic information
2-39
4048-1xx
Dead machine service check
Note: Check the AC line voltage. The voltage should be within the
following limits:
•
90 V ac–120 V ac for nominal–100 V model printer
•
100 V ac–127 V ac for the nominal–110 V model printer
•
200 V ac–240 V ac for the nominal–220 V model printer
Low voltage power supply (LVPS) service check
FRU Action
Low voltage power
supply (LVPS)
(100 V, 110 V, or 220 V) Unplug the power cord and verify that the
cable is correct and functioning. Replace if
necessary.
With the power cord unplugged, remove the
HVPS fan and disconnect the 8–pin (CN2)
connector from the LVPS. Pin 8 is the topmost
pin of the connector.
• Verify pins #2, #5, and #6 are ground.
Replug the power cord and turn the printer on.
CAUTION: Be careful to not ground pins to
cage while testing.
• Verify pin #4 is +5 V dc.
• Verify pins #7 and #8 are +24 V dc.
If any one of these is incorrect, replace the
LVPS.
If these are correct, check the controller card,
operator panel, and wiring.
Note: A “dead machine” implies no power
beyond the LVPS. If the printer behaves “dead”
but has correct power from the LVPS, unplug
all connectors from the controller card except
J18 (power from LVPS). Turn the printer on. If
the printer does not beep 5 times, replace the
controller card. If it does beep, turn the power
off and plug in other devices such as sensors
and operator panel one at a time. Turn the
printer back on and observe any beeps and/or
operator panel messages. This technique may
be repeated to help isolate a faulty component
or short.