User's Manual

32
Fuse Replacement
The user is allowed to change mains fuses (6.3 x 32mm), accessible from the rear panel, only. In
the case of fuse (fuses) interruption inside the power amplifier, exchange can be carried out only
by professionally qualified person! Internal fuses are located mainly on the SWITCH-on board
(next to the HV transformer).
One special fuse is used in the model
OM2000A+. In the case of an accidental
discharges in the tube this fuse saves HV
supply circuits.
Fuse
6.2. Tube Replacement
In the case of vacuum tube damaging, contact the manufacturer or your dealer for ordering new
one. You will get instructuions how to change it. Exchange can be carried out only by
professionally qualified person! After tube replacing automatic BIAS adjustment must be done.
6.3. Cleaning
To prevent damage to amplifier surface and plastic components do not use aggressive chemicals
for cleaning. Do not open the amplifier for cleaning. Outer surface may be safely accomplished by
using piece of soft cotton cloth moistured with clean water or window cleaner.
7. APPENDIX
7.1. Primary AC voltage selection
Primary section of the HV transformer is switchable for three values of AC voltage (220, 230,
240V). Factory settings is 230VAC. Before first starting of the PA we recommend to check the
correct value according to the AC voltage in your network. Change the settings, if necessary.
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.