Service manual M500 N, M520, M525 Fault finding
Doc Code 10 665 751
4-9 08/2007 Gahe
Error message
Description Remedy
MF: Zoom unexpected stop
End position of zoom motor was reached
untimely.
Reason can be increased friction of
mechanic or motor problem.
MF: Focus unexpected stop
End position of focus motor was reached
untimely.
Reason can be increased friction of
mechanic or motor problem.
MF: CAN bus restarted
More than 256 transmission errors did
occur on CAN bus; CAN controller chip
is initialized again and bus
communication is launched again.
• Check CAN cables
• Electronic problem on CAN
controller like inaccurate bit
rate or faulty bus
transceiver chip.
MF: Error while installing CAN
objects
Required amount of CAN objects could
not be installed.
Electronic problem on motor
controller: defect of CAN controller
chip
MF: Zoom end position not reached
Could not reach end position of zoom,
therefore position counter is not properly
set.
Reason can be increased friction of
mechanic or motor problem.
MF: Focus end position not reached
Could not reach end position of focus,
therefore position counter is not properly
set.
Reason can be increased friction of
mechanic or motor problem.
MF: Zoom position error
Could not reach required zoom position.
Reason can be increased friction of
mechanic (or manipulation on
emergency drive knob) or motor
problem.
MF: Focus position error
Could not reach required focus position.
Reason can be increased friction of
mechanic (or manipulation on
emergency drive knob) or motor
problem.
Iris init pos not reached (No 107) Iris motor could not reach end position. Mechanical problem in Iris assembly.
Unexpected Iris stop (No 125) End position of Iris motor was reached
untimely.
Reason can be increased friction of
mechanic or motor problem.
Relevant error messages caused by the control unit (basic SW errors are not listed):
Error message
Description Remedy
CAN warning 1: 96 communication
errors
More than 96 transmission errors did
occur on CAN bus; bus communication
is launched again.
• Check CAN cables
• Electronic problem on CAN
controller like inaccurate bit
rate or faulty bus
transceiver chip.
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