beautypg.com

Blower motor troubleshooting – TurboChef Technologies 2020 User Manual

Page 48

background image

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

TEST MODE

. If any of these

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

TEST MODE

(see

Manipulating Top and Bottom Blowers, page 18, and page

17 for an illustration of

TEST MODE

).

d. If DC voltage is present throughout all speed settings in

TEST MODE

(see

Manipulating

Top and Bottom Blowers, page 18, and page 17 for an illustration of

TEST MODE

), replace

motor controller. If not, check harness and/or replace I/O board.