Microwave Energy; Voltage Compensation; Upper Halogen Lamp Balance - GE SCB2000 Technical Service Manual

Microwave Energy (M=)
Microwave energy is provided by the high voltage/
magnetron circuit and directed via the wave guide
directly into the oven cavity. As the food rotates on
the oven turntable, microwave energy is evenly
distributed to all portions of the food. Select a
higher setting to shorten cooking time for dense or
heavy foods (example: casseroles, whole
chicken). Select a lower setting for delicate foods
(example: cakes, breads, souffles) or foods
requiring longer cooking times for tender results
(example: stew, pot roast).
CONTROL BOARD
N
HV PRIMARY PRIMARY
WINDING INTERLOCK
SECONDARY
(MAGNETRON)
INTERLOCK RELAY

Voltage Compensation

Note: Voltage compensation only occurs during
speedcook operation (preselect menu item). In
other words, when cooking with manual cook,
voltage compensation does not occur. When using
speedcook, you are selecting preselected items
from a menu. These items require compensation
for accurate and consistent cooking results.
Voltage fluctuations in the power lines can cause
inconsistencies in cooking. Advantium
automatically measures line voltage at the start of
each speedcooking selection and adjusts the
cooking time to achieve consistent quality
results.
Line voltage is monitored by the voltage
compensation transformer, which is located on the
smart board. This transformer monitors the
voltage from L2 to neutral.
SMART BOARD
Voltage Compensation Circuit
The optimal line voltage, where no voltage
compensation occurs, is 120 VAC. Above
120 VAC, time is subtracted from the recipe.
Below 120 VAC, time is added to the recipe. The
amount of voltage compensation required is
dependent upon the incoming voltage at the start
of the cooking cycle, and the particular
CAVITY TCO
FUSE MGT TCO
ONE SHOT
(20 AMPS) (302 /140 F)
(302 /140 F)
GEA00398
BN
Y
GEA00424
speedcooking selection that is chosen. The chart
below shows the predicted compensation times
based on a 5-minute speedcook selection (such
as: Biscuits, Refr; Large; 8 biscuits).
V O L
L 2
1
1
1
1
1
L1
1
1
1
1
1
1
1
1
Voltage compensation occurs after approximately
5 seconds of cooking operation. The display will
show "OPTIMIZING COOK TIME." The time will
flash and then display the new adjusted time,
based on the amount of voltage compensation
required.
OPTIMIZING COOK TIME
9:55
OVEN LOCKED
Voltage compensation only occurs during
speedcook operation and only occurs once during
the cooking cycle (at initial start of speedcook
operation).

Upper Halogen Lamp Balance

As stated previously, the upper halogen lamps
operate together at the same power level.
However, in order to provide even (balanced)
cooking performance, the upper rear halogen
lamp will always cycle at 85% of the upper front
halogen lamp. In other words, if the upper halogen
lamps are set at power level 10 (U=10), you would
expect both elements to operate at 100% of each
32-second duty cycle. Instead, the upper rear
halogen will cycle at 85% of power level 10, or
– 18 –
T A G E I T M E s ( c e ) s
o t N C O M P E N S A T O I N
0 8 6 0 0 .
1 0 4 7 9 .
1 2 3 6 7 .
1 4 2 6 3 .
1 6 1 6 7 .
1 8 7 9 .
2 0 0 0 .
2 2 7 - 1 .
2 4 1 - 3 3 .
2 6 1 - 8 8 .
2 8 2 - 3 3 .
3 0 2 - 7 1 .
3 2 3 - 0 0 .
SELECT MUTE TIMER
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