Diagnostic information 2-29
4506-1xx
LVPS/HVPS service check
Main motor service check
LVPS/HVPS LVPS portion of the LVPS/HVPS
Use the voltage meter to verify the appropriate voltage at the printer end of the
power cable. Disconnect the power cable from the printer and the fuser cable
(CN403) and check the following:
• Continuity across the power switch when it is on. Leave the power switch
turned on.
• Continuity from the lower blade of the 110/220 V ac receptacle (designated
“L” on the controller card) to the following:
- Each end of the two fuses
- Pin 1 of the fuser connector (CN403)
If any of these fail, replace the LVPS/HVPS. See “LVPS/HVPS removal” on
page 4-19.
Disconnect the cable from the controller card (CN402) and the fan (CN404).
Reconnect the fuser, turn the power switch off and reconnect the power cord into
the printer. Turn the printer on and verify the following:
• +24 V dc at pins 12, 13, 14, 15, 16, and 18 on CN402 (pins 12, 13, 14, 15,
and 16 are interconnected)
• +24 V dc at pin 1 on CN404
Turn the printer off and verify grounds on pins 2, 4, 6, 8, and 17 of CN402. If any
of these voltages or grounds fail, replace the LVPS/HVPS. See “LVPS/HVPS
removal” on page 4-19.
HVPS portion of the LVPS/HVPS
Remove the LVPS/HVPS to inspect the HVPS contacts. Clean the contacts,
both springs and pads, if necessary.
Note: The voltage for the transfer roll is created on the transfer card and input
sensor assembly. See “Transfer roll service check” on page 2-41.
FRU Action
Main motor
(not a FRU)
Controller card
Warning: Do not
replace the operator
panel and controller
card at the same time.
Each card contains the
printer settings. When
either of these cards is
new, it obtains some of
the settings from the
other card. Settings
are lost when both are
new and replaced at
the same time.
Turn off the printer, and unplug the main motor cable at J4. Turn on the printer,
and check for +5 V dc on pins 1, 2, 3, 4, and 6. Pin 5 should be grounded:
• If these voltages are correct, call the next level of support.
• If these voltages are not correct, see “LVPS/HVPS card” on page 5-4, or
replace the controller card. See “Controller card removal” on page 4-17.
Note: The main motor is not a service part.
J4 pins Voltages
Pins 1, 2, 3, 4, and 6 Approx. +5 V dc
Pin 5 Ground
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