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Figure 7.1
Faulting flowchart
1371Issue3(4/91)
TPU
Is the system completely dead?
yes
I
Power down CCU for
2 seconds then power
up to reset system
I
o/k?
yes
no
I
Check mains supply
to CCU
o/k?
yes
no
I
Check fuses
in mains plug
and CCU
I
o/k?
yes
Start
I
Does the fault effect all extensions?
Change telephone
Check wiring
for faults
yes
no
I
Change CCU
Faulting and maintenance
no
I
no
Power down CCU for
I
2 seconds then power
up to reset system
I
o/k?
yes
no
yes
I
I
o/k?
no
I
Change CCU
I
o/k?
no
I
Change CCU
7-2
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