Microwave System Troubleshooting - TurboChef TORNADO Service Manual

34 THE MICROWAVE SYSTEM

MICROWAVE SYSTEM TROUBLESHOOTING

ISSUE
Magnetron
Troubleshooting
Guidelines
F3: Magnetron
Current Low
RESOLUTION
: Never test the secondary voltages. Voltage on this side of the
W A R N I N G
circuit is lethal, reaching up to 5000 volts!
All tests performed on the components are done with the oven unplugged
and the capacitors discharged.
The capacitors in this oven utilize a device that will automatically discharge
the voltage.
: Always verify the capacitor is discharged before servicing the
W A R N I N G
components.
Discharging can be done by unplugging the oven and then short across the
red wire on each capacitor to the chassis with an insulated screwdriver.
1. Remove the top and right side covers.
2. Enter the test mode. (From the
and keys, enter the code 9-4-2-8 and press
BACK ENTER
3. Place amp meter on the brown (US ovens) or blue (International ovens)
"ct" wire for amp reading. Wire is coming from the primary side of the
HV transformers and looping through the black plastic current trans-
former on the main control board and back to the HV transformers.
4. Press and hold the
MGTRON
magnetrons.
5. Observe the amperage on the meter. Typical readings are:
: 12-14 amps at 240VAC/13-16 amps at 208VAC.
NORTH AMERICA
: 12-15 amps at 230VAC
INTERNATIONAL
: 12-15 amps at 220VAC
BRAZIL
: 16-17 amps at 200VAC
JAPAN
If proper amperage appears but takes longer than 2 complete seconds to
appear, call TurboChef Tech support for assistance. If amperage is present
but lower than typical readings, perform the troubleshooting steps in the
previous pages of this section. If amperage is not present, check the condi-
tion of the F3 fuse. Fuse must be a 20-amp fuse and is the right-most of
the three fuses on the bottom of the oven.
If fuse has failed, replace the fuse after troubleshooting (previous pages of
this section). If fuse has not failed, check the incoming (primary side)
voltage to the high-voltage transformers.
mode, simultaneously press
OVEN OFF
soft key on the keypad to energize the
).
ENTER