User's Manual | ACOM 500S | 160-4
m Linear Power Amplifier
Page 52 of 66 | S e c t i o n MAINTENANCE
March 2023
WARNING
Do not replace internal fuses located inside the amplifier.
Blown internal fuses can be a symptom of a more serious problem, which should be
resolved beforehand. A fault of this type will not occur under normal operating
circumstances.
Replacing internal fuses is a complex and potentially dangerous operation.
For this reason, we recommend this work be carried out only by a trained service
technician.
Contact your ACOM dealer for assistance (see Section
Unauthorized replacement of inside fuses infringes the warranty conditions!
Besides several specific national standards, the principal fuses standard applied
worldwide is IEC 60127.
7.4.
Using the Fault Codes (signatures) for Diagnostics
The data of the last 28 HARD FAULT protection trips is stored in the amplifier memory (see Section
The data can be downloaded from the memory through the RS-232 port and stored in a computer file even
if the amplifier cannot be turned on after a serious fault - only external power has to be fed to the Control
unit in either of the following ways:
•
External 8 to 15 VDC voltage applied to the "DEBUG mode" input (see
pin out of the CAT/AUX connector
) of the CAT/AUX port. The power supply has to be capable to
provide 0.4 A of current;
•
If the Control board has already been removed from the amplifier, it can be powered directly
with +5 V (0.4 A) and the fault log downloaded via the RS-232 port.
In the FAULT LOG reading mode (see
), the Control board automatically transmits
the data from the memory trough the RS-232 interface (see Section
2.5.b) RS-232 interface connector
). The
RS-232 protocol settings are: 9600, 8 N 1. Depending on the number of fault events stored in the memory,
the transmission may take between 0.5 and 12 seconds. A pause of 6 seconds follows, then transmission
starts again. The data can be read in a plain-text format with a computer, using a standard terminal emulating
program (TTY).
You can send the recorded file to your dealer or to ACOM accordingly.
To decode the downloaded hexadecimal data, you have to use the
ACOM Hard Faults Signatures Converter
(Excel file), distributed by ACOM free of charge. You can download it from
