Service Guide
33
63
Main motor lost sync.
1. Is the imaging unit properly installed and locked in position?
2. Do the photoconductive and accumulator belts rotate when
driven by the main motor? Manually turn the main drive gears
to rotate the belts of the imaging unit. If the gear is difficult to
turn, replace the imaging unit.
3. Inspect the drive gear for missing teeth.
4. Does the main motor rotate? Check the main motors wiring
harness to the engine control board at CN15. If the wiring
checks out, replace the main motor.
5. Replace the engine control board.
64
Lower Tray Assembly error.
1. Is the printer correctly installed on top of the lower tray
assembly?
2. Ensure that the Lower Tray Assembly is the correct model for the
printer. Lower Tray Assemblies for earlier model printers, such
as the Phaser 560, will not work with the Phaser 740.
70
Program ROM Checksum error.
1. Replace the engine control board.
2. Replace the engine board NVRAM.
71
Program SRAM Checksum error.
1. Replace the engine control board.
2. Replace the engine board NVRAM.
72
EEPROM Checksum error (ECU).
1. Replace the engine control board.
2. Replace the engine board NVRAM.
73
EEPROM Checksum error (imaging Unit).
1. Replace the imaging unit.
2. Replace the engine control board.
3. Replace the engine board NVRAM.
74
EEPROM Checksum error (fuser).
1. Replace the fuser.
2. Replace the engine control board.
3. Replace the engine board NVRAM.
80
VSYNC time-out.
1. Check connection between the image processor board and the
engine control board.
2. Replace the engine control board.
3. Replace the image process board.
81
Power missing error. Engine control board not powered.
1. Check wiring harness CN25 to the engine control board.
Print engine service error codes
Error code
Meaning of error code and what to do about it
Summary of Contents for Phaser 740
Page 6: ......
Page 48: ...36 Phaser 740 and 750 Color Printers ...
Page 102: ...90 Phaser 740 and 750 Color Printers ...
Page 104: ...92 Phaser 740 and 750 Color Printers ...
Page 124: ...112 Phaser 740 and 750 Color Printers ...
Page 129: ...Service Guide 117 Figure 3 Motor and fan FRUs 3102 37 1 10 9 5 8 7 2 6 4 3 ...
Page 131: ...Service Guide 119 Figure 4 Sensor switch and flag FRUs 3102 40 1 7 2 3 4 8 5 6 ...
Page 135: ...Service Guide 123 Figure 6 Imaging and paper feed component FRUs 3102 39 1 2 3 7 9 4 6 8 5 ...