Enraf Nonius Radarmed 650, Руководство по обслуживанию

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Enraf-Nonius B.V. Radarmed 650 Service Manual 1409773
Maintenance January 2000
4-3
2. Check power supply PC Board voltages
see par. 4.3.5
3. Check/replace wiring
4. Check/replace display PC Board
5. Check/replace main PC Board
4.4.1.3 Fan does not start, display OK 1. Check/replace fuse F103
2. Check/replace fan
4.4.1.4 No H.F. output 1. Check/replace H.F. Cable
2. Check/replace emitter
3. Check/replace main PC Board
4. Check/replace treatment timer
5. Check/replace power output control (R1)
6. Check/replace magnetron/filter assy.
7. Check/replace transformer (TR2)
4.4.1.5 Safety test fails 1. Check/replace wiring
2. Check/replace transformer
3. Replace main PC Board
4.5 REPLACEMENT PROCEDURES
4.5.1 General
When handling static sensitive devices such as the PC Boards of the Radarmed 650 the
following precautions should be observed:
- Persons should be earthed by means of a wrist strap
- Ground all electrical equipment, work-bench, soldering iron etc.
After every repair a functional test must be performed (see par. 4.3).
Warning: Inside the Radarmed 650 high voltages are available, beware of electrical
shock. Do not touch components or heat sinks when the cover is removed.
4.5.2 Front cover
Removal: Switch off the unit and remove the mains cable from the mains entrance.
Remove the screws on both sides of the metal strip between top- and front
cover. Remove the metal strip. Remove the two screws of the front cover.
Remove the front cover by lifting it from the chassis.
Installation: Installation of the front cover is in reverse order of the removal procedure.
4.5.3 Top cover
Removal: Remove the front cover (see par. 4.5.2). Remove the four screws at the top
at the inside of the housing. Lift the top cover carefully, and put it carefully
with the rear side-down on the chassis and disconnect the mains switch if