Follow these steps :
Cause: The Voltage of the print head is abnormal.
Problems can be with:
-Printhead
-head relay PCB
-Carriage relay PCB
-Main controller PCB
Steps to be followed:
1. Replace the printhead.
2. Cable continuity check.
if continuity of the cable between the head relay PCB and the carriage relay PCB is abnormal, replace the cable.
3. Replace the head relay PCB.
4. Cable continuity check.
if continuity of the cable between the carriage relay PCB iand the main controller PCB is abnormal, replace the cable.
5.Replace the carriage relay PCB.
6.Replace the main controller PCB.
Http://www.fixya.com/support/t10375522-cannon_ipf700
The service error 6500 refers to "other hardware error". This error results from printer hardware failure & nothing much a user can do except replacing the malfunctioning hardware. If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response Thanks, Joe
6500 is generally logic board error code. If the printer is under warranty, you better ask for replacement.
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
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