Phaser 6128MFP Service Manual 4-63
General Troubleshooting
Inoperable Printer Troubleshooting
Engine Power-Up Sequence
1. Machine Control Unit (MCU) Board logic check
2. Toner Cartridge (Missing, NVRAM (CRUM) Error, CRUM ID, Life Over)
3. Fuser (Missing, NVRAM (CRUM) Error, Life Over)
4. Transfer Belt (Missing, Life Over)
5. ADC Sensor (Error)
6. All paper Sensor (Jam)
7. Door (Open)
8. Environmental (Humidity/Temperature) Sensor (Error)
9. NVRAM (NVRAM Error)
10. Image Processor Board POST Diagnostic check
Printer Continually Displays Warming Up
1. Verify the correct Fuser (110 V vs. 220 V) is installed in the printer.
2. Refer to the Engine Power-Up Sequence (page 4-63).
AC Power Supply Troubleshooting
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ LVPS, PL9.1.4 ■ “LVPS” on page 10-14
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Check the voltage at the AC wall outlet.
Is there approximately 110 VAC (or 220
VAC if the printer is a 220 V
configuration) at the AC wall outlet?
Go to step 2. Notify the
customer of
improper AC
output from
the outlet.
2 Check the power cord for defects or a
loose connection. Is the power cord loose
or defective?
Replace or
reconnect
the power
cord.
Replace the
LVPS
(page 8-47).
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