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Phaser 6280 Color Laser Printer Service Manual
4-71
General Troubleshooting
DC Power Supply Troubleshooting
LVPS Overcurrent Protection Circuit
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.
LVPS Overvoltage Protection Circuit
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.
LVPS
Troubleshooting Reference Table
Applicable Parts
Wiring and Plug/Jack Map References
■
LVPS, PL9.1.4
■
Top LV Harness, PL10.1.16
■
“Map 4 - LVPS and MCU Boards” on
■
“DC Power Supply” on page 10-21
Troubleshooting Procedure Table
Step
Actions and Questions
Yes
No
1
1. Perform the AC power supply
troubleshooting procedure (page 4-70).
2. Does the problem persist?
Go to step 2.
Complete.
2
1. Turn the AC power switch Off.
2. Is the Fuse on the low-voltage power
supply board open?
Replace the
LVPS
(page 8-80).
Go to step 3.
3
1. Disconnect the connectors J501 and
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
Go to step 4.
Replace the
LVPS
(page 8-80).
Summary of Contents for Phaser 6280
Page 1: ...Phaser 6280 Color Laser Printer Phaser 6280 Service Manual...
Page 2: ......
Page 15: ...Phaser 6280 Color Laser Printer Service Manual xiii...
Page 16: ...xiv Phaser 6280 Color Laser Printer Service Manual...
Page 26: ...xxiv Phaser 6280 Color Laser Printer Service Manual Table of Contents...
Page 62: ...1 36 Phaser 6280 Color Laser Printer Service Manual General Information...
Page 288: ...3 152 Phaser 6280 Color Laser Printer Service Manual Error Messages and Codes...
Page 432: ...5 58 Phaser 6280 Color Laser Printer Service Manual Print Quality Troubleshooting...
Page 558: ...8 112 Phaser 6280 Color Laser Printer Service Manual Service Parts Disassembly...
Page 670: ...I 10 Phaser 6280 Color Laser Printer Service Manual...
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