SERVICE PROCEDURES AND ADJUSTMENTS
SOLID STATE TEMPERATURE
CONTROLLER TEST (SG4D/SG6D)
Certain procedures in this section require
electrical test or measurements while power is
applied to the machine. Exercise extreme caution
at all times. If test points are not easily accessible,
discern power, attach test equipment and reapply
power to test.
Test Steps
1.
Remove the right side panel as outlined under
Cover and Panels in Removal and Replacement
of Parts.
2.
Place a thermocouple in the geometric center of
the oven cavity. Oven temperature must be
below 450°F.
3.
Set the temperature control to the maximum
setting.
4.
Set the power control to 100%.
5.
Check machine data plate for correct voltage to
oven. Refer to diagram below for proper terminal
locations and voltages before checking
temperature controller. Use the correct terminals
for the corresponding voltage.
6.
Turn the ON-OFF-OVEN-COOL switch to ON.
Fig. 54
7.
Check for voltage across terminals J2 and J4
(120 Volt) or J2 and J9 (208/240 Volt) for power
to the control.
A.
If correct, proceed to step 8.
B.
If incorrect, the problem is not in the
temperature control (see Troubleshooting).
8.
Check for voltage to the switching output.
A.
For 120 VAC controls, check across
terminals J3 and J4 for input voltage and
between J4 and J5 for output voltage from
the internal switching device.
B.
For 208/240 VAC controls, check across
terminals J3 and J9 for input voltage and
between J9 and J5 for output voltage from
the internal switching device.
1)
If input voltage is correct, proceed to
step 9. If input voltage is not present,
the problem is not in the controller (See
Troubleshooting).
2)
If output voltage is correct, proceed to
step 9. If output voltage is not correct,
check temperature probe, as outlined
under Temperature Probe Test
(SG4D/SG6D).
C.
If the probe connected to J6 and J7 is either
shorted or opened, the red LED located just
above J6 (to the left of J6 when mounted)
will flash. With the probe connected and the
LED not flashing, slowly turn the
Temperature set knob until the pointer
passes through the mid point of rotation. At
the mid point of rotation, the red LED will
come on. If the control is set and left at the
mid point, the LED will stay on. With the LED
on at mid point, you have tested the entire
front end of the control circuit as well as the
probe and verified that the control is
functioning normally.
9.
Set temperature control to minimum setting.
Oven temperature must be above 300°F.
10. Check for zero volts (0.00 Volts) across terminals
J4 and J5 (120 Volt) or J9 and J5 (208/240 Volt)
for no output from the internal switching device.
A.
If correct, temperature control is functioning
properly.
B.
If incorrect, check temperature probe as
outlined under Temperature Probe Test
(SG4D/SG6D).
SG4 & SG6 Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS
F35626 Rev. B (1118)
Page 26 of 56
