Turbochef-technologies TurboChef User Manual download pdf (Page 46)

ISSUE RESOLUTION

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

Working or Food Not

Cooking Evenly

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

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

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

is Drawing Excessive

Current.

Measure resistance of high-voltage capacitor(s).

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

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

Filament Transformer(s)

Faulty

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

Use an ohm meter to measure the primary and secondary winding

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

Covers Broken

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-

ent, replace the wave guide and the magnetron.

THE MICROWAVE SYSTEM

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Turbochef-technologies TurboChef User Manual Page 46

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