Leica M500 N Service Manual page 48

Fault finding
08/2007 Gahe
Error message
CAN warning 2: 256 communication
errors
CAN error while installing objects
CAN invalid identifier or handle
Info: CAN transmit buffer not empty
EEROM invalid BCC, writing defaults EEPROM checksum not valid.
Keyboard task watchdog error
Footswitch task watchdog error
Setup and display task watchdog
error
Status task watchdog error
Display parameter task watchdog
error
CAN transmit task watchdog error
Exception error reboot
No status response from stand
Stand detected (configuration error) Stand was found on CAN bus, although it
Stand not detected (configuration
error)
Autofocus detected (config.error)
Autofocus not detected
(config.error)
Focus position (autofocus) not
found
No remote response from autofocus No status response from autofocus
4-10
Description
More than 256 transmission errors did
occur on CAN bus; CAN controller chip
is initialized again and bus
communication is launched again.
Required amount of CAN objects could
not be installed.
Received unknown identifier.
Various internal reasons possible.
Appropriate task crashed.
No status response from stand CAN
controller within 5 seconds.
is set to NOT PRESENT.
Stand was not found on CAN bus,
although it is set to PRESENT.
Autofocus device was found on CAN
bus, although it is set to NOT PRESENT.
Autofocus device was not found on CAN
bus, although it is set to PRESENT.
Autofocus device terminated cycle
without detecting the optimal range.
device within 3 seconds.
Service manual M500 N, M520, M525
Doc Code 10 665 751
Remedy
•
Check CAN cables
•
Electronic problem on CAN
controller like inaccurate bit
rate or faulty bus
transceiver chip.
Electronic problem on control
module: defect of CAN controller
chip
Check compatibility of software in
control unit with other connected
devices.
No serious problem as long as it
does not occur together with „CAN
transmit mailbox overflow" and as
long as it does not occur often.
EEPROM faulty.
SW problem or external impacts
(EMC)
If no problem with CAN
communication it is a problem of
CAN controller in stand.
Set stand in device list PRESENT.
Set stand in device list
NOT PRESENT.
Set autofocus in device list
PRESENT.
Set autofocus device in device list
NOT PRESENT.
Problem in autofocus devices
Problem in autofocus devices