6. MAINTENANCE
DANGER
Both the mains voltage and the high voltages up to 3000 V inside the amplifier are
LETHAL!
For your safety, pull the amplifier power plug out of the mains wall outlet and WAIT AT
LEAST 30 minutes EACH TIME BEFORE you remove the cover of the amplifier. Do not
touch any part inside while the amplifier is open because some residual voltages may
still be present.
If no indicator glows upon switching the amplifier ON, the main fuse(s) may have blown
(see Section 6.3 Fuse Replacement).
If the characters on the VFD are dim, please, see Section 5.1 Display Brightness Control (not
operative with OLED display).
6.1. Periodic Maintenance
a) Periodic checks
Periodically (but at least once per year) check all connections, contact cleanliness and the tightening of all
connectors, in particular the coaxial ones.
Check the integrity of the cables, in particular when they are laid on the floor. Check also if the cables are
secured well in the area where they come out of the connector body.
Pay particular attention to the mains plug and the wall outlet (see Sections 2.4.g) Power cord and
2.4.h) Preparation of wall outlet). If you have any doubts consult with a qualified electrician.
Periodically check the SWR of the antennas and if this changes over time. Problems could occur more often
in poor weather conditions - rain, snow, strong wind etc.
b) Air filter
Periodically (more often in a dusty environment, but at least once per year) clean the air filter without
opening the amplifier (see Figure 2-1 Rear panel - Connections, Pos. (1)).
CAUTION
The air filter may be too dusty - be careful how you clean it so that you DO NOT INHALE
(BREATHE IN) neither spill the dust over! Wrap it, for instance, in a wet cloth before
cleaning!
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