Dc Power Supply Troubleshooting - Xerox Phaser 6500 Service Manual

General Troubleshooting

DC Power Supply Troubleshooting

4-68
Troubleshooting Procedure Table
Step Actions and Questions
1 Check the Power Cord.
Is the Power Cord plugged into the
printer and the AC outlet?
2 Check the voltage at the AC wall outlet.
Is there approximately 110 or 220 VAC
at the AC outlet?
3 Check for AC voltage to the LVPS.
1. Remove the Left Cover.
2. Power the Printer On.
3. Measure AC voltage at the P/J48.
Is AC line voltage present P/J48?
4 Check Power Switch Harness continuity.
Disconnect the printer from the wall
outlet.
Turn the power switch On.
Check for continuity between:
P/J483 <=> P/J48-1
■
P/J484 <=>P/J48-3
■
Is the Power Switch conductive?
DC voltages are supplied by the LVPS. The LVPS includes protection circuitry that
limits possible damage to printer components in the event of a short or transient
event.
LVPS Overcurrent Protection Circuit
This circuit stops all outputs in the event of a short in any supplied voltage. (3.3, 5,
or 24). The circuit is reset when the short is removed and the power cycled.
LVPS Overvoltage Protection Circuit
This circuit stops all outputs if the supply voltage exceeds the target voltage. The
set point is 32 V or less for 24 V, 7 V or less for 5 V, or 4.4 V for 3.3 V.
Xerox Internal Use Only
http://www.manuals4you.com
Yes
Go to step 2. Replace or
Go to step 2. Notify the
Replace the
LVPS
(page 8-124.
Check the
Power Cord.
If necessary,
replace the
cord.
Phaser 6500/WorkCentre 6505 Service Manual
No
reconnect
the power
cord.
customer.
Go to Step 4.
Replace the
Power Switch
Harness
(page 8-131.