7
3. Cleaning
The surface and printed text on the casing is largely scratch resistant. The casing may be cleaned with a
mild soap solution or spirit based glass cleaner (use economically) and a soft lint free cloth.
NOTE:
Care should be taken during cleaning to ensure that no liquids can ingress into the casing. It is
advised for safety reasons to remove the power cable from the electrical supply before cleaning the casing
with a damp cloth. Do not use solvents or abrasives for cleaning. This could damage the surface.
4. If something doesn't work...
Some suspected defects of the equipment are very often found to have been caused by faulty operation.
Before you consult us please check the functioning of your mono amp according to the following checklist:
Loudspeakers remain inoperative
•
Test initially whether the pre-amplifier and the selected signal source are operating correctly. This is best
achieved by checking the functioning of the pre-amplifier with head phones. Remember to remove the
head phones jack after use, otherwise the pre-amplifier will not emit a signal.
•
Ensure that there are no breaks or short circuits in the signal cable between the mono amp and the pre-
amplifier.
•
Test the connecting cable between the Mono amp and the loudspeaker for a short circuit or break.
The amp switches while listening to music from OPERATE to STAND BY.
If this should occur then one of the protective circuits (over heating, short circuit) has functioned. The failure
is indicated by the blinking LED on the front panel (1) and the LEDs (6) on the rear panel:
•
LED "heat" is blinking: The MA3.2S is overheated. Switch it off and let it cool down for 10 Minutes.
•
The LED "load" is blinking: Switch the MA3.2S off and check if there is a short circuit in the speaker
cable.
•
Both LEDs are blinking: The MA3.2S has an internal defect. Contact your dealer.
After switching off the pre-amplifier the amp does not automatically switch to stand by (after approx.
5 min.) although the mode selector (7) was set to "auto".
Check whether a low humming or chirping noise is heard from the loud speakers after switching off the pre-
amplifier. If this is so then scattering emissions within the cable are interfering with the automatic switch-on
circuitry. This is interpreting the interference as a music signal and reacts by not switching off the amp.
Remedy: Place your cable so that no further interference is experienced. With balanced XLR cables this fault
can also arise from an error in the pin setting.
Humming during music reproduction
•
This is mostly caused by a ground loop through the antenna amplifier or postal cabling. Check if the
humming stops following removal of the aerial cable from the tuner (and, if connected, the TV set and
video recorder too). If this is successful then fit a ground breaking filter to the aerial cables of these
receivers. (Your dealer will supply).
•
The shield of the AF-cable is interrupted, the cinch connector has poor ground contact.
•
The use of a balanced cable with wrong setting.
