Lucent Technologies Lineage
®
2000 200A Ferroresonant Rectifier J85503B-2
8 - 6 Replacing Components and Circuit Modules
Issue 8 January 1999
2. Remove the two nuts that secure the thyristor to the heat
sink. Save the nuts and the thermal pad from under the
thyristor.
3. When reinstalling a new thyristor, use the hardware and
thermal pad (DP102 comcode 403208242) saved in Step
(2). Note that the small gate terminal always faces down.
Torque the mounting nuts to 10 in-lb. Reconnect the wires
to the new thyristor.
Diode Heat Sink
Assemblies
1. Remove the nuts securing the pigtail of the diode to be
replaced from the power transformer.
2. Use a meter with a diode test function (or measure the
forward and backward resistances of the diode) to
determine if the diode is good. A good diode should
measure at least 50 ohms in both directions, and one
direction should measure at least 50 times the other. The
larger resistance is the back resistance, and the smaller is
the forward resistance. Most diodes that fail do so by
shorting (i.e. they will measure shorted or almost shorted
in both directions).
3. If the diode checked bad, replace it. If the diode checked
good, reinstall it.
4. Remove the nut on the back side of the diode. Save the
thermal pad and nut. Cut cable tie securing the pigtail lead.
5. Reinstall diode with thermal pad. Dress pigtail lead away
from any sharp corners. Torque diode nut to 300 in-lbs.
Torque pigtail connection to transformers to 65 in-lb.
Reinstall cable ties.
DC Capacitors
(C7 through C12)
DANGER
DC capacitors may be charged even with power
disconnected from the rectifier. If filter capacitor fuses have
blown, capacitors will be charged. Always check all of the dc
capacitor terminals (observe polarity) with a voltmeter
before performing this procedure, and discharge capacitors
safely, if necessary. Wait at least 5 minutes after shutting
down ac and CB1 before working on capacitors or associated
buswork.
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