Enraf Nonius Radarmed 650, Service Manual

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Enraf-Nonius B.V. Radarmed 650 Service Manual 1409773
Maintenance January 2000
4-1
4 MAINTENANCE
4.1 GENERAL
We recommend to check the Radarmed 650 annually.
4.2 CHECKLIST
The following procedures must be carried out during an inspection and/or after every repair:
4.2.1 Modifications, if any, according to the "Service Info" sheets. See appendix C of this manual
for further information.
4.2.2 Visual inspection. Check the electrical wiring for safety and check that all components are
properly fastened. Check that the fuses have the specified ratings (see par. 1.3.1).
4.2.3 Check that all accessories are in good condition.
4.2.4 Functional test (see chapter 4.3).
4.2.5 File all service activities.
4.3 FUNCTIONAL TEST
4.3.1 Fan and display test
Connect the Radarmed 650 to the mains and switch on the equipment, the fan starts to run.
Check that the fan runs without rattling. Also check the air-flow is correct, the air is blown
threw the magnetron and that the air-intake is free. Check that the three-segment LED
output power display will light (display shows “000").
Switch off the unit.
4.3.2 Treatment timer
Connect a large (150 Watt) H.F. emitter to the Radarmed 650. Switch on the unit and set a
treatment time with the mechanical treatment timer. Turn the output power control fully anti-
clockwise turn the output control clockwise until the output power display reads “150" (Watt).
Check that at the end of the treatment time the H.F. output switches off and the end of
treatment signal heard. The output power display will show “000".
Switch off the unit.
4.3.3 H.F. emitter detection circuit
Connect a large (150 watt) emitter to the unit. Set treatment time (for example 5 min.) and
start a treatment. Check that there is H.F. output. Stop the treatment by turning the output
power control to zero. Disconnect the H.F. emitter cable from the unit (output impedance
).
Turn the output power control clockwise and check the output power. Increasing the output
power control will not result in increasing the H.F. output signal (display shows “000"), no