User's Manual

Lucent Technologies — Proprietary
See notice on first page
401-660-100 Issue 11 August 2000
22-35
Linear Amplifier Circuit (LAC) Maintenance
Figure 22-11. View of the Linearizer Faceplate with the Front Grille Removed
Procedure:
1. Check that all 20A breakers feeding LAC 0 (LAC 4 in LAF1) are closed.
2. If a fan is stopped, check its wiring. Check the fan for blockage.
3. Check the 24-volt DC voltage on connector J1 supplying LAC 0. If normal,
the fan should be replaced. Replace both preamp fans (see Section 4) at
the same time, even if the other fan is working normally.
INPUT DRIVE
ANTENNA
PRE-AMPLIFIER
LINEARIZER
INPUT DRIVE
FANS
FCA
STATUS
LINEARIZER
FAN
LINEAR
AMPLIFIER
UNIT
FAN
PRE
AMPLIFIER
STATUS
LINEARIZER
FAN
LINEAR
AMPLIFIER
UNIT
FAN
PRE
AMPLIFIER
PRE-AMPLIFIER
LINEARIZER
10A
24V
3A
24V
2A
24V
2A
24V
5A
24V
LINEAR
AMPLIFIER
UNIT
LINEAR
AMPLIFIER
UNIT