363-205-401 Power Up:
Issue 7, March 1997 Page 1 of 4
DLP-517
Install 3C( ) Ringing Generators in J1C182BB Bulk
Power Shelf
SUMMARY:
Insert
3C( ) RINGING GENERATOR
into
RING GEN1
slot in power
shelf. Measure 90 to 110 V AC and −50 to −60 V DC at
RSU
[−
20HZ (1)
,
(2)
/
GRD
].
Unseat
RING GEN1
, install
RING GEN2
and repeat. Reseat
RING GEN1
and press
and hold
RG1 SHUTDOWN
button on
RSU
. Verify that
FAIL
indicator on
RING
GEN1
is lighted and
FAIL
indicator on
RING GEN2
is off. Release
RG1 SHUTDOWN
button and press and hold
RG2 SHUTDOWN
button on
RSU
. Verify that
FAIL
indicator on
RING GEN1
is off and
FAIL
indicator on
RING GEN2
is lighted.
1. Get two
3C( ) RINGING GENERATOR
s and inspect for possible physical
damage.
2. Insert one
3C( ) RINGING GENERATOR
into
RING GEN1
slot in power shelf.
3. Condition digital multimeter (DMM) to measure AC volts.
4. On
RSU
, connect DMM test leads to −
20HZ (1)
jack and
GRD
jack.
Response: DMM indicates between 90 and 110 volts.
5. Condition DMM to measure DC volts.
Response: DMM indicates between −50 and −60 volts.
6. Repeat Steps
3
through
5
with the DMM test leads connected to −
20HZ (2)
jack and
GRD
jack on
RSU
.
7. Is AC/DC ringing present at both −
20HZ
jacks on the
RSU
?
If
YES,
then proceed to Step
24.
If
NO,
then continue with Step
8.
8. Is AC/DC ringing present at one −
20HZ
jack on the
RSU
?
If
YES,
then continue with Step
9.
If
NO,
then proceed to Step
12.
9. Replace
RSU
and repeat Steps
3
through
6
.
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