HP LASERJET ENTERPRISE 500 - Page 46

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Chapter 4 Troubleshooting Display Messages
HMR BANK FAN FLT Hammer Bank Fan Fault.
Sensors cannot detect current
in the fan circuit.
1. Cycle power. If the message
appears, press CLEAR. If the
message does not clear, go to step 2.
2. Power off the printer. Remove the
paper path or pedestal top cover.
Disconnect connector P107 from the
CMX controller board. Test connector
P107/HBF for shorts or opens. (Refer
to the Main Wire Harness Test
Tables in Appendix A.) Replace
components that fail test.
3. Make sure P107/HBF has a good
connection at J107 on the CMX
controller board.
4. Inspect for obstructions of airways
and vents. Remove obstructions.
5. Power on the printer. If the message
appears, replace the CMX controller
board. Record the message and
return it with defective CMX board.
ILL EXT BUS ACC* Illegal External Bus Access.
Firmware error on the CMX
controller board.
1. Cycle power. Run the print job again.
If the message appears, download
the emulation software again (page
129).
2. Cycle power. Run the print job again.
If the message appears, replace the
CMX controller board. Record the
message and return it with defective
CMX board.
ILL INST ACCSS* Illegal Instruction Accessed.
Firmware error on the CMX
controller board.
1. Cycle power. Run the print job again.
If the message appears, download
the emulation software again (page
129).
2. Cycle power. Run the print job again.
If the message appears, replace the
CMX controller board. Record the
message and return it with defective
CMX board.
ILLGL OPR ACCSS*
1. Illegal Operand Accessed.
Firmware error on the CMX
controller board.
1. Cycle power. Run the print job again.
If the message appears, download
the emulation software again (page
129).
2. Cycle power. Run the print job again.
If the message appears, replace the
CMX controller board. Record the
message and return it with defective
CMX board.
Table 2. Message List
Message Explanation Solution