Cooling Fan Service Check; Cover Interlock Switch Service Check - Lexmark 363dn Service Manual

Controller board service check (continued)
FRU
LVPS/HVPS

Cooling fan service check

FRU
Cooling fan

Cover interlock switch service check

Note: Make sure a print cartridge assembly is installed and the cover closes all the way, engaging the cover
open switch lever.
FRU
Cover interlock switch
Action
Verify main power to controller board
With the printer off, unplug the LVPS/HVPS cable at J22 on the controller board. Verify
grounds on pins 10, 12, 14, 16 and 18 for both the cable and the controller board. If any of
these grounds are incorrect, then check the cable for continuity. If the cable fails continuity,
then call the next level of support.
Turn the printer on with the cable still unplugged, and verify the following on the cable
(controller board will not be powered):
If any of the voltages are incorrect, then replace the LVPS/HVPS. See
service check" on page 2-28.
Action
Make sure the fan cable plug is properly seated at J13 (controller board).
Turn the printer on. Within a few seconds, the controller board assembly should apply
+24 V dc to pin 2.
• If voltage is not present, then check or replace the controller board. See
board removal" on page
• If voltage is present, then check pin 1 for 24 V dc as well. If it is close to 24 V dc while
the fan is still idle, then replace the fan. See
Action
Disconnect the cover interlock cable from the controller board at J6.
With the printer turned off:
1. Verify continuity between cable pin 1 and pin 2 with the door closed and discontinuity
with the door open.
2. Verify continuity between cable pin 1 and pin 3 with the door open and discontinuity with
the door closed.
3. Verify discontinuity between cable pins 2 and 3 whether the door is open or closed.
• If any fail, then replace the cover interlock switch.
• If both pass continuity, then turn the printer on, and measure +5 V dc on pin 2 at J6 on
the controller board.
• Verify pin 3 at J6 is ground.
• If voltage or ground is not present, then see
page 2-26 for more information.
Pins Voltage
6, 17, 19 +24 V dc
1, 3-5, 11, 13, +5 V dc
15
4-13.
"Fan removal" on page
"Controller board service check" on
7013-XXX
"Dead machine
"Controller
4-22.
2-27
Diagnostics information