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Operator’s Manual • Malfunction
– 4.2 – 6076.0822.12.01
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Troubleshooting of the remote-controlled transceiver is possible by using for instance a Control
Unit GB 4000C, mod. 03.
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For detection of device and system failures Built-In Test (BIT) functions are implemented in the
equipment.
The BIT functions support the service team in detecting and analysing equipment and system
errors, helping them to decide on appropriate countermeasures.
q PBIT
The Power-on BIT is performed automatically after power supply has been switched
on.
q CBIT
The Continuous BIT starts directly after PBIT.
The system is subjected to a functional check.
The modules installed in the radio basis are continuously checked by CBIT.
Warnings and/or error messages produced during ongoing operation are displayed in
Menu 410 (RADIO CBIT RESULTS) for the transceiver and in Menu 810 (CU CBIT RE-
SULTS) for the control unit.
As long as an error is indicated in Menu 410 (RADIO CBIT RESULTS), the GO LED
remains dark and connector contact X23.4 (NOGO) carries low level.
Menu 420 (RADIO ERROR LIST) or 820 (CU ERROR LIST) displays all warnings and
error messages that have occurred, together with the time of occurrence.
When malfunctions (warning or error message) have been detected, the failure is sig-
nalled to the control unit and/or via GB2PP protocol to a connected remote control unit.
q IBIT
The Initiated BIT is used for equipment diagnostics (test of LEDs, RF wiring etc.). IBIT
helps to localize failures and to support maintenance.
It can be activated directly on the local control unit (Menu 405 (RADIO IBIT RESULTS))
and also by a remote control command (only GB2PP protocol).
It takes several minutes for IBIT to be completed. It is possible to interrupt this test any
time and to continue later.
During IBIT the transceiver is not available for operation.
Please note that the radio is only ok if CBIT and IBIT both signal GO.
The rating of a BIT message can be either warning or error, depending on how serious the trou-
ble is.
q When there is a warning, operation may still go on, although the radio should be checked
as soon as possible. The GO LED remains lighted in the presence of warnings.
q When an error is indicated, the radio is not working correctly and needs to be sent to the
next repair facility. The GO LED is extinguished in the presence of errors, and contact
X23.4 changes to low level.
Irrespective of the rating, a BIT message is reported in Menu 410 (RADIO CBIT RESULTS)
and/or Menu 420 (RADIO ERROR LIST). Please take care: the RADIO ERROR LIST contains
both errors and warnings.
CBIT always indicates the existing state, that means, as long as a BIT message is being indi-
cated by CBIT, this problem persists.
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