Power Up: DLP-528
363-205-401
Page 2 of 4
Issue 7, March 1997
PRELIMINARY DRAFT
Figure 1 – Ringing Generator Installed in Ring Shelf
6.
Condition DMM to measure DC volts.
7.
On RING GEN1, connect DMM test leads to
−
48V jack and GND jack [Figure
1].
8.
Does DMM indicate between
−
43 and
−
56 volts?
If YES, then proceed to Step 14.
If NO, then continue with Step 9.
9.
Replace RINGING GENERATOR. Does DMM indicate between
−
43 and
−
56
volts?
If YES, then proceed to Step 14.
If NO, then continue with Step 10.
10. On right-hand side of ring shelf, disconnect P117 connector. Connect DMM
test leads to pin 8 (
−
48V) and pin 9 (
−
48V RTN) [Figure 2].
GND
-20HZ
FAIL
-48V
GENERATOR
RINGING
3C
GND
-20HZ
GENERATOR
RINGING
3C
FAIL
-48V
GROUP 1
RING GEN 2
+20HZA
+20HZB
-48V
GND
RING GEN 1
RCU
RCU
RMN
1
+20HZ
0.5A
-20HZ
0.5A
2
3
4
AUG3
RMJ
GROUP 2
RING GEN 1
RING GEN 2
RCU
Lucent
Lucent
Lucent