4-64
Phaser 6128MFP Service Manual
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.
LVPS
Troubleshooting Reference Table
Applicable Parts
Wiring and Plug/Jack Map References
■
LVPS, PL10.6.16
■
MCU Board, PL10.7.7
■
Troubleshooting Procedure Table
Step
Actions and Questions
Yes
No
1
Check the AC power supply (page 4-73).
Does the problem persist?
Go to step 2.
Complete.
2
Turn the Power Switch Off.
Is the Fuse on the LVPS open?
Replace the
LVPS
(page 8-47).
Go to step 3.
3
1. Disconnect J501 and J502 from the
LVPS.
2. Turn the Power Switch On.
3. Measure the DC voltages between
these pins on the LVPS:
■
P501-1 <=> P501-2 = +5 V
■
P501-3 <=> P501-4 = +3.3 V
■
P502-1 <=> P502-2 = +24 V
Are all of the voltages present?
Go to step 4.
Replace the
LVPS
(page 8-47).
Summary of Contents for Phaser 6128 MFP
Page 1: ...Phaser 6128MFP Multi Function Printer Phaser 6128MFP Service Manual ...
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Page 14: ...xii Phaser 6128MFP Service Manual Contents ...
Page 24: ...xxii Phaser 6128MFP Service Manual ...
Page 54: ...1 30 Phaser 6128MFP Service Manual General Information ...
Page 120: ...2 66 Phaser 6128MFP Service Manual Theory of Operation ...
Page 270: ...3 150 Phaser 6128MFP Service Manual Error Messages and Codes ...
Page 408: ...5 62 Phaser 6128MFP Service Manual Print Quality Troubleshooting ...
Page 420: ...6 12 Phaser 6128MFP Service Manual Adjustments and Calibrations ...
Page 424: ...7 4 Phaser 6128MFP Service Manual Cleaning and Maintenance ...
Page 604: ...I 6 Phaser 6128MFP Service Manual ...
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