OM POWER OM2000A+ Manual page 57

Plate voltage error
Grid voltage is low
Screen voltage error
Amplifier is too hot
HARD FAULT
Heating voltage error
Cooling error
Mains error
Check plate power supply
Check grid power supply
Check screen power supply
Check cooling system
Set up additional blower
Check HV circuits and Tube
Set up proper transformer
voltage selector
Check blower rotation
Check mains voltage and set
up nominal mains voltage
Set up proper transformer
voltage selector
High voltage supply fault. Check the fuses on HV
board.
Low voltage on the grid. Check fuse F4 on SW ON
board.
Check fuse F5 on HV supply board and fuse F1 on the
Screen board.
Check the airflow (ventilation grid on the rear panel).
Cooling exhaust must be free from any obstructions.
During extended use set the blower speed to ALWAYS
ON . (page 19)
Protection circuit saved HV against overload. If high
current from the HV supply caused the HARD FAULT
then protection is activated and the PA is automatically
switched OFF. Check HV circuits, blocking capacitors
and the tube itself.
This error is usually due to improper setting of the
primary voltage on the transformer (page 34). In
normal condition Uf readings should be 8,5V to 9,3V.
Main blower problem. Check its functionality.
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 23).
Check the primary voltage setting on the
transformer. This fault may also be caused by
"soft" mains, when during transmitting the AC
voltage drops to a very low level.
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