Lexmark 4500-00 Series, Service Manual

Page: 97 / 246

Diagnostic information
2-67
4500
Controller card service check (E220/E321/E323)
FRU Action
Controller card assembly 5 V dc and +24 V dc inputs
from the LVPS.
• Turn the printer off.
• Disconnect the LVPS cable from
the controller card at J1. See
“Controller (E220/E321/E323
only) ” on page 5-7
for more
information.
• Turn the printer on.
24 V dc from the cable,
pins 3 and 4. 5 V dc on cable
pin 1.
Verify that pins 2, 5 and 6 on both
the cable and the card connectors
are grounded.
• If voltages are correct, check the
continuity in the cable. If the
cable is good, see the
“Low
voltage power supply (LVPS)
service check ” on page 2-76
for more information.
• If grounds are not correct on the
cable, first check it for continuity
and then the LVPS.
• If the grounds are not correct on
the controller card, replace the
controller card. (Check with one
probe on the connector pin and
the other on the cards ground
plane found at each screw
head.)