Specifications

41
Trouble shooting -continued
Problem
Possible Cause
Remedy
Maintenance Mode message
Maintenance switch or
maintenance function is
on
1- Control unit zero/span
key was pressed.
2- Service module
zero/operate switch in
zero, span/operate switch
in span
3- Service module
test/operate switch in test
Return all to operate or
neutral positions and press
ACK key to clear alarms.
Control unit blank
Control unit fuse open
Replace and check for
shorts in the power supply
or individual boards.