OM4000 HF POWER AMPLIFIER
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6.
MAINTENANCE
6.1. Indication of fault conditions
OM4000 HF has the following indication LED on the front panel:
GRID MIN
- Indication of first gird current
GRID MAX
- Max. First grid current exceeded
HV
- Measuring of anode voltage by bar graph
IP
- Measuring of anode currency by bar graph
FAULT
- Fault
OPR
- Amplifier in operation mode
STBY
- Amplifier in standby mode
WAIT
- Heating of tube after switching on the amplifier
NOTE
Should a fault condition appear during the tuning or operation of the amplifier, the safety
circuits of OM4000 HF will react. The amplifier will be turned to STBY mode. After abt. 2 sec
the control circuits will switch the amplifier back to OPR.
CAUTION
If the fault will repeat 3 times after each other the control circuits will turn the amplifier
to STBY. Bringing the amplifier to OPR is enabled by using the OPR/STBY switch only.
After reaction of safety circuits, the FAULT LED will be lit up for approx. 5 sec, depending on
the nature of the fault.
Flashing LED signalizes:
IP
- Anode currency exceeded
HV
- Low anode voltage
FAULT
- Reflected output exceeded
GRID MAX
- Grid currency exceeded
- Screen currency exceeded
GRID MAX + HV
- Maximum load power exceeded
GRID MAX + IP
- Zero output power during tuning
HV + IP
- Tuning fault, incorrect tuning of the Pi-L output circuit
In the case when your OM4000 HF amplifier is not working correctly, please contact the
manufacturer or your dealer.
