Besides the primary fuses, there are internal fuses inside the amplifier.
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 1.3 Owner Assistance).
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 5.4 Menu
FAULTS LOG).
The data can be downloaded from ACOM 2020S memory through the RS-232 port and stored in a computer
file even if the amplifier cannot be turned on after a serious fault - feeding external power to the Control
unit only in either of the following ways will do:
• 8 to 15 V DC voltage applied to the "DEBUG mode" input (see Table 2-2 | Signals and pin out of
the CAT/AUX connector) of the CAT/AUX port. The power supply has to be capable of 0.4 A
current;
• If the Control board has already been taken out of 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 Section 5.4 Menu FAULTS LOG), the Control board automatically
transmits FAULTS LOG data from the memory through the RS-232 interface (see Section 2.5.c) Amplifier's RS-
232 interface connector). The RS-232 protocol settings are: 9600, 8, N, 1 (9600 bit/s, 8 information bits, no
parity check, 1 stop bit).
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