User's Manual

Lucent Technologies — Proprietary
See notice on first page
401-660-100 Issue 11 August 2000
22-19
Linear Amplifier Circuit (LAC) Maintenance
Figure 22-3. Location of LAM Fuses, LEDs, and the 10/20 Switch (on C-Series
LACs)
Preamp Alarm
Procedure
Notes about Preamps
1. Before a preamp is installed, check that the gain adjustment screw is
turned fully counter-clockwise (minimum gain).
2. Before adjusting the gain,
be sure to allow at least a 30-minute warm-up
period
to allow the preamp to stabilize.
Notes about Preamp Alarms
1. A blown fuse can result in an intermittent alarm for some preamps; the
alarm will clear without traffic. This is true for AT&T as well as Amplidyne
preamps. Trontech and Decibel units will give a continuous alarm for a
blown fuse. This is due to a difference in the implementation of the alarm
circuitry.
LAM
LEDs
10/20
SWITCH
LAM
FUSES