User's Manual

Page 15 of 17
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.