TurboChef Technologies Residential Single and Double Wall Oven - Manual (Page 67)

TROUBLESHOO
TING
6.3
5. Turn the magnetrons off . Depending on the
measurement, follow the below steps.
If 15-19 amps are present, verify the magnetron
cooling fans are running whenever the magnetrons
are running. Th
e thermostats can cause the
magnetrons to shut down and reset when cool.
If 8.5-10 amps are present,
1. Check relay operation. For Gen 1, check the
control voltage from the control board at P8-13
+ P8-5, and at P8-14 + P8-5. For Gen 2,
visually check relays 2 and 3 for operation. If
they operate correctly, check the HV outputs to
each transformer at terminals RBJ-4 + RBJ-5.
2. Isolate the left and right magnetron circuits and
retest. For Gen 1 ovens, remove the brown lead
to the transformer. For Gen 2 ovens, remove
either RBJ-4 or RBJ-5.
If 0 amps are present,
1. Ensure power is reaching the oven from the wall.
2. Check the 20-amp fuse.
3. Check for incoming voltage at each transformer
when the magnetrons are energized. For Gen 1,
test voltage from the relays at the transformer.
For Gen 2, 208 or 240 VAC must be between
the blue wire at the CT coil (CT1-B) and either
terminal RBJ-5 (right) or RBJ-4 (left) on the
relay
board.
Blower Failure
Th e control board sends voltage to the blower motor
speed controller (BMSC) to activate the blowers. If
both blowers successfully activate, a signal is sent back
to the control board to verify the system is
functioning normally. If that signal is not sent back to
the control board, this error screen is displayed.
Possible causes:
- BMSC (blower motor speed control)
-
Blower motors
- Faulty control board
-
Faulty wiring
- Faulty relay board (Gen 2 only)
Possible components to be replaced:
-
BMSC
- Blower motors
- Control board
- Relay board (Gen 2 only)
Magnetron Failure
A current transformer located on the control board
monitors the current draw of the microwave system.
Th
e oven uses two separate magnetron circuits, each
drawing approximately 8-9 amps. If the control board
senses 0 amps, this error screen is displayed.
Possible causes:
- Faulty K3 or K4 relay (Gen 1) or relay 2 or 3
(Gen 2; the entire relay board must be replaced)
- Faulty left or right high-voltage transformer
- Faulty left or right high-voltage capacitor
- Faulty left or right high-voltage diode
- Faulty left or right magnetron
- Faulty 20-amp fuse (Gen 2: located on relay
board as F1 fuse)
-
Faulty wiring
- Faulty control board
- Faulty left or right magnetron thermostat
Possible components to be replaced:
- K3 relay (Gen 1) or relay 2 or 3 (Gen 2; the
entire relay board must be replaced)
- K4 relay (Gen 1) or relay 2 or 3 (Gen 2; the
entire relay board must be replaced)
- High voltage transformer
- High voltage capacitor
-
High-voltage diode
- Magnetron
- 20 amp fuse (Gen 2: located on relay
board as F1 fuse)
-
Control board
- Left or right magnetron thermostat
Magnetron Failure Troubleshooting
1. Pull the oven 11” (280 mm) from the cabinet
and remove the top front cover.
2. Place the oven in Installer Setup mode (page 4.4).
3. Place a water load in the cook cavity.
DANGER: DO NOT touch or attempt to mea-
sure the magnetrons, HV transformers, capacitors, or
any component within the microwave circuit while
the magnetrons are running. Lethal voltage will be
present.
4. Turn the magnetrons on and measure for 15-19
amps around the wire in the current transformer
loop on the control board.