Troubleshooting
20 AP-74700 – Rev. 1.0 – 10/03/2008
If anything goes wrong in this process, the following parts inside this loop needs to be verified:
1)
Verify the encoder signal of the Paper Feed system
Diagnostic Æ test Æ encoder Æ PF
If the Hex counter changes near PF, when turning the grid-roll shaft, the encoder is ok.
If not ok:
• Be assured that the PF encoder sensor is properly adjusted and positioned
• Check if the encoder disk is clean and not scratched. Clean with Isopropyl alcohol and a fibre-free
tissue only!
Verify the X-motor functionality via the aging procedure
Diagnostics Æ Life Æ PF Motor
If the motor is not responding:
• Go to step 3, verify the driver + cable connections
• If still not OK, replace the X-motor
2) Check the X motor driver-IC.
The driver chip is located on the mainboard on U94 for old board revisions. New board
revisions (RoHS) the driver chip is the U109. The following pins should be measured:
• Between pin 1 and 10
•
Between pin 2 and 11
The measurement value should be approx. 2 to 3 Meg Ohms. If this is not the case, the driver is broken,
replace the mainboard
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