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363-205-401
Power Up:
Issue 7, March 1997
Page 1 of 4
DLP-508
Install 3C( ) Ringing Generators in Power Shelf
SUMMARY: Insert Main 3C( ) RINGING GENERATOR into left RING GEN slot in
power shelf. Measure 90 to 110 V AC and
−
50 to
−
60 V DC at LDU (
−
20HZ/GND).
Unseat main RINGING GENERATOR, install spare RINGING GENERATOR and
repeat. Reseat main RINGING GENERATOR and press and hold TEST PROT RG
button on LDU. Verify that FAIL indicator on spare RINGING GENERATOR is off and
FAIL indicator on main RINGING GENERATOR is lighted.
1.
Get two 3C( ) RINGING GENERATORs and inspect for possible physical
damage.
2.
!
CAUTION:
Damage to 3C( ) RINGING GENERATOR and shelf connector may occur
if 3C( ) RINGING GENERATOR is forced into position.
Insert one 3C( ) RINGING GENERATOR into main (left) RING GEN slot in
power shelf.
3.
Condition DMM to measure AC volts.
4.
On LDU, connect DMM test leads to
−
20 HZ jack and GND jack.
5.
Does DMM indicate between 90 and 110 volts?
If YES, then continue with Step 6.
If NO, then proceed to Step 8.
6.
Condition DMM to measure DC volts.