36 THE MICROWAVE SYSTEM

I S S U E

R E S O L U T I O N

 

 

F3 Fuse Blown, cont.

c. Monitor circuit fault: Verify operation of all interlock switches.

 

In addition, check the Fault Log. If the monitor switch opened prior to

 

the primary and secondary, the control would have recorded the

 

occurrence. See page 25 as well as Chapter 6 (Oven Door) for

 

troubleshooting (see F4 MONITOR).

 

 

Mag 1 or Mag 2 Not

Determine which magnetron is not oscillating by placing a clamp-on

Working or Food Not

amp meter on the primary winding of each high-voltage transformer

Cooking Evenly

and energizing the Microwave System.

 

1. Amp = 0. High-voltage transformer not energizing.

 

Check K2 relay and wiring going to suspect high-voltage transformer.

 

† K2 relay or wiring bad: Replace K2 relay and/or repair wiring.

 

† K2 relay OK: Check high-voltage transformer. See the table on page

 

33 for resistance values. Unplug the oven and replace high-voltage

 

transformer if defective.

 

2. Amps = 3 amps on high-voltage transformer. Magnetron is not

 

oscillating, but high-voltage transformer is energizing.

 

† Diodes failed: Unplug the oven and replace the diodes.

 

† Diodes OK: Unplug the oven and replace the defective magnetron.

 

 

Magnetron Circuit

Measure resistance of high-voltage capacitor(s).

is Drawing Excessive

Resistance should start out in the megohm range and continue to rise as

Current.

the probes are held on the capacitor. If the resistance is low (less than the

 

megohm range), unplug the oven and replace the capacitor. Visually check

 

the associated high-voltage transformer primary winding for signs of over-

 

heating (winding is very dark and discolored). If transformer primary

 

winding looks bad, replace it.

 

 

High Voltage and/or

Determine if the high-voltage or filament transformer(s) is defective.

Filament Transformer(s)

Use an ohm meter to measure the primary and secondary winding

Faulty

resistances. Refer to the high-voltage and filament transformer table on

 

page 33 to determine if the transformer is OK. If the resistance is

 

different then the table indicates, ensure the oven is unplugged and

 

replace the transformer.

 

 

Wave Guide

Replace the wave guide covers. Follow the instructions on pages 29-30 and

Figure 22 on page 29. Inspect the wave guides for debris. If debris is pres-

Covers Broken

ent, replace the wave guide and the magnetron.

 

 

 

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Page 46
Image 46
Turbo Chef Technologies NGC-1007 Primary and secondary, the control would have recorded, Troubleshooting see F4 Monitor
Page 45 Page 47

NGC-1007 specifications

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