Maintenance
9
Coolant Level
Coolant lifetime will vary greatly depending on operating conditions. For heavy use (full RF power for long times,
high ambient temperature), check the coolant every 500 hours. If the load has only had light duty (fraction of full
power, low ambient temperature), then coolant inspection may only be necessary every 2,000 hours.
Note:
NOTE: Correct any coolant leakage before inspection. (See “Troubleshooting”
on page 11)
To inspect the coolant:
Remove the load resistor (Refer to “Load Resistor” on page 18).
The coolant should be clear, with a faint yellow tinge, and have a slightly sweet smell.
If it is black with a burnt or acrid smell, drain it and add about 6.7 gal (25.2 L) of
coolant.
With the load still on end, the coolant level should be 4
3
4
" (125 mm) below the top
surface of the resistor assembly mounting ring, at ambient temperature. Add coolant if
necessary.
Repair
Replace RF Connector
The following procedure may be used to remove and replace Bird QC connectors.
1.
Remove four 8-32 round head machine screws from the corners of the connector flange.
2.
Pull the connector straight out.
3.
Align the replacement connectors center contact pin with the socket and seat QC connector.
4.
Install four 8-32 round head machine screws in the corners of the connector flange to secure the QC connector
in place.
Note:
If not using the LC connector normally supplied, the frequency and power must be limited to
the capabilities of the connector.
WARNING
Disconnect the unit from all power sources before servicing.
The unit may be energized from multiple sources.
The potential for electric shock exists.
CAUTION
Use only Bird coolant, P/N 5-1070, to prevent damage to the load.
WARNING
Disconnect the unit from all power sources before servicing.
The unit may be energized from multiple sources.
The potential for electric shock exists.
WARNING
BOTH
vent plugs must be used at all times when the unit is operating or cooling.
Failure to do so could result in an
explosion or severe burns.
