60
Plate voltage error
Check plate power supply
High voltage supply fault. Check fuses on HV board.
Grid voltage is low
Check grid power supply
Low voltage on the grid. Check fuse F4 on SW ON
board.
Screen voltage error
Check screen power supply
Check fuse F5 on HV supply board and fuse F1 on the
screen board.
Amplifier is too hot
Check cooling system
Set up aditional blower
Check the airflow (ventilation grid on the rear panel).
Cooling exhaust must be free – no obstacle within
15cm. During long contest set additional blower
ALLWAYS ON (page 18).
HARD FAULT
Check HV circuits and Tube
Protection circuit saved HV against overload. I the
case of too high current from the HV supply the HARD
FAULT protection is activated and switched the PA
automatically OFF. Check HV circuits, blocking
capacitors and the tube.
Heating voltage error
Set up properly transformer
voltage selector
Usually is due to improper setting of the primary
voltage on the transformer (page 33). In normal
condition Uf should be 9V +/- 0,3V.
Cooling error
Check blower rotation
Main blower lost the speed. Check its
functionality.
Mains error
Check mains voltage and set
up nominal mains voltage
Set up properly transformer
voltage selector
This error may be caused by the improper setting
of the nominal value of Um. Check your AC mains
voltage and set it as nominal Um (page 21).
Check primary voltage setting on the transformer.
This fault may occurs also in the case of very
“soft” mains, when during transmitting AC voltage
dropped down to very low level.
Factory reset
I the case of very abnormal behavior of is possible to make factory reset. After that
all the parameters will be changed to the factory default values.
Press ON/OFF button, hold it and press Main switch. ON/OFF button hold pressed several
seconds, until next display will appear.
If you are sure to make factory reset,
press YES.
Type of supported TCVR and
working
frequency are visible on the
display.
AUTO LED is ON.