Service Checks; Cooling Fan Service Check - Lexmark T430 Service Manual

4048-1xx

Service checks

Service checks involve measuring voltages of the LVPS, HVPS, and
controller card assembly. Continuity and resistance verifications are
done on cables and components as required.
Note: When looking at the printed side of a printed circuit board,
connectors are designated with "J" followed by a number. Pin #1 is
designated on the board by an adjacent "1" or triangle. Pin numbers
index sequentially to the opposite end of the connector. See
"Controller card assembly" on page 5-2
The controller card passes +5 V dc and +24 V dc from the LVPS to
its clients. Therefore, when either voltage is missing as an output on
the controller card, be sure to verify the inputs from the LVPS (J17,
sockets 1 and 2 at +24 V dc and socket 5 at +5 V dc).

Cooling fan service check

FRU
Cooling fan (fuser)
Cooling fan (LVPS)
2-36
Service Manual
Action
Make sure the plugs of the cooling fan cables
are properly seated.
Both fans are connected to the same +24 V dc
on pin #1 at J19 on the controller. Pin #2 is
ground for both fans. Therefore if one fan
functions and the other does not, either the fan
or the cable is faulty. Turn the printer off and
disconnect the cooling fan cable at the suspect
cooling fan. Turn the printer on. Within
approximately 15 seconds the controller card
assembly should apply +24V dc to the fan. See
"Controller card assembly" on page 5-2
more information.
• If voltage is present, reconnect the fan to
verify the fan is faulty. If it is, replace the fan.
• If voltage is not present, disconnect the
cable from the controller card (J19) and
check for continuity on each cable.
– If the cable is good, see
card service check" on page 2-38
more information.
– If the cable is damaged, replace the
cable.
for more information.
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