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Control Unit Problems
4
The next step after resolving problems with telephones, adjuncts, and related
wiring, is to troubleshoot the control unit. Troubleshoot the control unit
components in the following order:
■ Power supply
■ Processor
■
Line/trunk and extension modules (hereafter referred to as modulles)
■ Carrier
WARNING:
Beware of hazardous voltages. Only qualified technicians should
attempt to service the control unit. Follow all procedures care fully.
Backing Up System Programming
Before performing any procedure that requires powering down the system,
save system programming in one of the following ways:
■
Save the system programming to a floppy disk. See System
Programming and Maintenance (SPM) for detailed instructions.
Control Unit Problems 4-1