REVUE THOMMEN AG
CH-4437 Waldenburg
AD20 Standby Altimeter
Page 58 of 72
07-Sep-2009 Document No: AD-INSOP-800 Revision: 1.6
5 Section V
5.1 Trouble shooting
The table below shows the general troubleshooting information to assist in locating and correcting
any malfunctions with the REVUE THOMMEN AD20 Standby Altimeter .
Procedure:
Malfunction Probable cause Remedy
pointer does not move power supply failure
input signal failure
electronic module failure
make sure the power supply
make sure the input signal
repair electronic module
pointer blocked electronic module failure repair electronic module
indicated values out of
tolerance (pointer or digital
display)
input signal failure
calibration error
electronic module failure
make sure the input signal
calibrate instrument
repair electronic module
pointer fails to return to
power off position
power back up failure repair electronic module
digital display blank power supply failure
input signal failure
electronic module failure
make sure the power supply
make sure the input signal
repair electronic module
digital I/O fails I/O signal out of tolerance
electronic module failure
make sure the I/O signal
repair electronic module
lighting defect power supply failure
CPU module.
Lighting module
make sure the power supply
make sure/repair of CPU module
make sure/repair of Dial Lighting
module
brightness of digital display
does not change
CPU module
Dual Lighting module
make sure/repair CPU module
make sure/repair of Dial Lighting
module
Table 5-1 Trouble Shooting Procedures
NOTE: For any malfunction of REVUE THOMMEN AD20 Standby Altimeter not listed in the table
above, the manufacturer can be contacted for assisting in the trouble shooting.
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