Nortel DMS-100 Series Maintenance Manual page 578

13-20 Star Remote System routine maintenance procedures
Heater element replacement
SRMO
(continued)
Summary of heater element replacement
At the SRMO site
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297-8353-550 Standard 05.01 March 2001
Continue only if you were directed to this procedure from a step in a
maintenance procedure. Using this procedure independently may cause
equipment damage or service interruption.
The type of enclosure the Star Module has determines your next action.
If the heater element is in the
telephony subsystem (TSS)
battery compartment
Open the SRMO cabinet door. Open the TSS front cover by loosening the
two screws on the left side of the cover.
Set the main and rectifier circuit breakers on the ac panel to the OFF position.
Use a slot screwdriver to loosen the three 1/4-turn locking screws. Remove
the protective cover from the fans and heater.
Remove power from the heater element with faults by disconnecting the two
white in-line connectors in the wiring harness. The connectors are under the
fan and heater assembly. One wire is red and the other white. Also, use a
7mm nut driver to remove the nut that secures the green and yellow ground
wire for the heater element.
Use a pair of small wire cutters to cut the cable ties that fasten the heater
element wires in the cable harness.
Lift up on the heater element to free it from the three holding devices.
Get a new heater element and press it into the three holding devices.
Connect the two white in-line connectors in the wiring harness under the fan
and heater assembly. One wire is red and the other white. Also, use the 7mm
nut driver to tighten the nut that secures the green and yellow ground wire for
the heater element.
Install the protective cover for the fans and heater element. Use a slot
screwdriver to turn the three 1/4-turn locking screws and lock the cover in
position.
Set the main and rectifier circuit breakers on the ac panel to the ON position.
Close the TSS front cover and close the SRMO cabinet door.
Go to step 32.
Open the SRMO cabinet door.
Set the main and rectifier circuit breakers on the ac panel to the OFF position.
Disconnect the battery fuse holder from the negative (-) battery terminal.
Do
step 3
step 14