Installation manual

LBI-38988
23
TROUBLESHOOTING
The hardware used in the GETC is extremely reliable,
making component failure the unlikely cause of most
problems. The most common causes of problems are
programming errors and interface connections.
Use the following guidelines when troubleshooting a
GETC on site:
1. Verify the operation of front panel LEDs. This can
be done by performing the Operational Checkout
and verifying the LED indications. GETCs using
349A9607 Group 4 software may also indicate the
specific cause of the failure, refer to Failure Mode.
2. Verify that all cables are properly connected and
secure.
3. Verify the GETC’s personality is properly
programmed for the specific application. Refer to
TQ3357, PC Programmer and SRN1060 (SRN
1024 if using 19A705595G8 software).
4. Verify the Turbo Board is properly configured if
applicable. Refer to LBI-38822 and SRN 1062.
5. If you suspect that the GETC has failed, replace the
GETC with a known good unit properly configured
for this application.
FAILURE MODE
With the introduction of 349A9607 Group 4 software,
the GETC is able to indicate a specific failure via the front
panel LEDs. Prior to group 4 software, a failure is indicated
by incorrect LEDs, but the GETC did not indicate the root
cause. The failure modes listed in Table 9 describe the LED
displays and their corresponding failure mode interpretation.
In all 3 failure modes, the channel is completely taken
out of service. This allows the System Manager in Fully
Trunked systems to display a channel failure. In Trunked
Failsoft, the channel is removed from service to avoid using
the bad channel.
CHANNEL ACTIVITY LOGGER
Another diagnostic feature introduced with the
349A9607 Group 4 software is the Channel Activity Logger.
This feature allows the GETC to supply information about
what it sees from its inputs: the RF receiver, phoneline
receiver, station interface I/O. Additionally, the GETC can
supply internal event information about what the GETC is
doing. For example, if the GETC tries to train its Rockwell
modem, it will print a message 'MODEM TRAINING
STARTED", and when the modem becomes trained, it will
print 'MODEM TRAINING COMPLETED". In General,
the information supplied by the Channel Activity Logger is
EDACS specific and in some cases may need technical
assistance for interpretation. For detailed instructions on
using the Channel Activity Logger, refer to SRN1060 and
TQ3357 PC Programmer (version 4 or later).
IN CASE OF DIFFICULTY
If you are unable to resolve a problem to your
satisfaction, then contact the Ericsson Technical Assistance
Center (TAC) at 1-800-528-7711 (outside USA, 804-528-
7711).
Table 9 - Failure Modes
LED DISPLAY FAILURE MODE POSSIBLE FAILURE CAUSE
LED 7
(only ) - Flashing
Flashing rate = 1 second
Quick synthesizer reload after every 5 flashes
of LED 7 (quick flash of LEDs 3, 4, and 5)
GETC is unable to cause a
synthesizer lock.
Bad synthesizer, Bad 10V Station Power
Supply, incorrect operation of MASTER
III Station Module, J26 Incorrect.
LED 6
(only) - Flashing
Flashing rate = 1 second
GETC has detected a PA Low
Power Alarm condition.
Bad PA, incorrect adjustment of R141,
uncalibrated Power Sensor.
LED 6 & 7
(only) - Flashing simultaneously
Flashing rate = 1 second
GETC has detected failure of
Turbo Board.
Turbo Board switches not in operational
position (toward rear of GETC), wrong
turbo software, bad turbo card.