TAP-103
: Trouble Clearing 363-206-305
Page 2 of 2 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
8. Is the
FAIL
LED extinguished?
9. Has the replacement unit that was installed in
Step
7
been replaced while
performing this trouble procedure?
10. Press
LED TEST
button on
DSXBIU
.
Requirement:
FAIL
LED lights on
RGU
.
If LED does not light, replace the
RGU
by repeating this procedure starting at
Step
5
.
11. Measure
RGU
AC and DC ringing voltages between –
20 Hz
and
GND
.
Requirement: AC ringing voltage: 75 to 85 V AC RMS
DC ringing voltage: −42 to −70 V DC.
12. Measure
RGU
DC voltage between –
48V
and
GND
.
Requirement: DC voltage: −42 to −60 V DC.
13. Were
RGU
voltage requirements met?
14. Remove your wrist strap, secure the electronics compartment.
15.
STOP. YOU HAVE COMPLETED THIS PROCEDURE
.
If
YES
, proceed to
Step
10.
If
NO
, continue with
Step
9.
If
YES
, escalate to next level of support.
If
NO
, replace unit by repeating this procedure starting at
Step
5
.
If
YES
, continue with
Step
14
.
If
NO
, replace the
RGU
by repeating this procedure from
Step
5
.
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