97-7796264_09-04-2020
Information subject to change
33
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 7
7.3 No Signal
Missing Output signal may be caused by one of
the following:
1.
Master/Follower Jumpers are set to the Follower
(down) position. The amplifier should only be
configured for Follower mode if it is in a multi-
amplifier system; otherwise it should be set for
Master mode. See the
Advanced Configura-
tion
section in this manual for more information.
2.
Signal is not connected to any inputs on the
SIM card. See the
Amplifier Setup
section in
this manual for more information.
7.4 No LEDs Illuminated or No Fans
If none of the LEDs on the Display Panel are il
-
luminated and/or the fans are inoperative, check
the following:
1. The AC mains are not connected or not on
(see the
Amplifier Setup
section for more
information).
2.
Back Panel Breaker is not in the UP position.
3. Fuse F1 is open.
To Inspect Fuse F1 follow these steps:
1.
Turn Off the amplifier and disconnect the AC
mains.
2.
Locate Fuse Cover on the amplifier back panel
(see
Figure 7.3
). Remove Fuse Cover.
3. Remove fuse and inspect. Replace, if neces-
sary, with 1A slow blow fuse.
7.5 OverVoltage Warning Message
The amplifier will protect itself from AC mains volt
-
age that is 10% above the voltage indicated on
the back panel. If the AC mains voltage is more
than 10% above the operating voltage, reduce the
AC mains voltage to the proper level. When the
line voltage condition is corrected, the amplifier
will automatically reset. If the amplifier does not
automatically reset, the amplifier’s three internal
transformers may need to be rewired. Please see
the Factory Service information at the end of this
section.
7.6 Standby LED Remains Illuminated
The Standby indicator may remain illuminated
under three conditions:
1. If the output wells or power transformer have
overheated. If overheating is the problem, see
the following topic (
“Amplifier Overheats”
).
2.
If both the Standby and Ready LEDs remain
illuminated and the Interlock I/O Cable is being
used, the amplifier is being held in Remote
Standby mode by another device (see
Figure
7.4
). For more information on Remote Op
-
eration, see the
Applications
section in this
manual.
3.
If the connection to the Interlock – I/O Connec
-
tor or other input/output connection isn’t fully
secure. Check all wiring and connections.
Figure 7.3 – Fuse F1 Location
Figure 7.4 – Interlock I/O Connector
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