TurboChef 2020 Service Manual page 48

2 8 T R O U B L E S H O OT I N G
Blower Motor Troubleshooting
NOTE: Continued from page 27.
1. Verify motor spins freely.
- Motor seized: Unplug oven and correct obstruction or replace motor.
- Motor spins freely: Verify motor windings (see Figure 36, page 27).
2. Verify motor windings are OK. Measure the resistance between windings and chassis.
Unplug oven and replace motor if resistances do not agree with the values in the table on
page 27. If motor is OK, proceed to step 3, below.
3. Status indicators TBTB should be visible when motors are on in
indicators are not present (for example, TB_B):
a. Disconnect control wiring.
b. Ground the "Status OK" wire of the motor controller that is being tested (pin 5 on the J2
connector) to chassis (reference wiring schematic of the blower motor controllers on
pages 37-40).
c. Keeping the wire grounded, check terminals on the control wiring plug for 0-10 VDC
control voltage (reference drawing of Control Pinouts, page 39) while incrementing
blower speed in
17 for an illustration of
d. If DC voltage is present throughout all speed settings in
Top and Bottom Blowers, page 18, and page 17 for an illustration of
motor controller. If not, check harness and/or replace I/O board.
(see Manipulating Top and Bottom Blowers, page 18, and page
TEST MODE
).
TEST MODE
. If any of these
TEST MODE
(see Manipulating
TEST MODE
), replace
TEST MODE