Avaya Definity SI Maintenance Manual page 120

Routine Maintenance Procedures
Replacing a TN736 or TN752 power unit circuit
pack
Replacing either power unit interrupts the -5 volt supply to the carrier. This causes
all the analog circuit packs in the carrier to fail their Loop Around Tests and may
cause failures in circuit packs in the control complex. After the power unit has
been replaced, look for these alarms:
ANL-LINE alarms — refer to Test #47 (Loop Around and Conference Test)
in ''ANL-LINE (8-Port Analog Line), ANL-NE-L (8-Port Neon Analog
CO-TRK alarms — refer to Test #33 (Loop Around and Conference Test) in
''CO-TRK (CO
All other power supplies
Figure 5-3 on page 5-16
supply sub-assembly.
sub-assembly. The sections following the figures discuss how to disassemble the
unit and then replace the power supply or fans within the unit.
Figure 5-3. Power supply sub-assembly (outside view)
5-16 Issue 4 May 2002
Trunk)''.
and Figure 5-4 on page 5-17
Figure 5-5 on page 5-18
Screw
DCE
Connector
PI
Connector
Ground
Block
Power Cord
Receptacle
On/Off
Switch
provide views of the power
provides a view of the fan
Cable
Retainer
Power
Panel
Term
Connector
555-233-123
Line)''.