Dc Power Supply Troubleshooting; Lvps Overcurrent Protection Circuit; Lvps Overvoltage Protection Circuit; Lvps - Xerox Phaser 6280 Service Manual

DC Power Supply Troubleshooting

LVPS Overcurrent Protection Circuit

LVPS Overvoltage Protection Circuit

LVPS

Phaser 6280 Color Laser Printer Service Manual
This circuit stops all outputs if any of the Low Voltage Power Supply voltages
3.3 VDC, 5 VDC, or 24 VDC are shorted.
The circuit is reset when the short is removed, the power is turned Off, and
then On again.
This circuit stops all outputs if the power supply voltage 3.3 VDC, 5 VDC, or
24 VDC exceeds the specified voltage respectively. The operating point is 32
VDC or less for 24 VDC, 7 VDC or less for 5 VDC, or 4.4 VDC for 3.3 VDC.
The circuit is reset when the power is turned Off, and then On again after
certain time.
Troubleshooting Reference Table
Applicable Parts
LVPS, PL9.1.4
Top LV Harness, PL10.1.16
Troubleshooting Procedure Table
Step Actions and Questions
1. Perform the AC power supply
1
troubleshooting procedure (page 4-70).
2. Does the problem persist?
1. Turn the AC power switch Off.
2
2. Is the Fuse on the low-voltage power
supply board open?
1. Disconnect the connectors J501 and
3
J502 from the LVPS.
2. Turn the AC power Switch On.
3. Verify the DC voltages between the
following pins on the LVPS:
P501-1 pin <=> P501-2 pin = +5 V
P501-3 pin <=> P501-4 pin = +3.3 V
P502-1 pin <=> P501-2 pin = +24 V
General Troubleshooting
Wiring and Plug/Jack Map References
"Map 4 - LVPS and MCU Boards" on
page 10-12
"DC Power Supply" on page 10-21
Yes
Go to step 2.
Replace the
LVPS
(page 8-80).
Go to step 4.
No
Complete.
Go to step 3.
Replace the
LVPS
(page 8-80).
4-71