TRAINING MANUAL WM0742HGA
WM0742HGA Page 52 TRAINING MANUAL
Actual Terminal Wiring
The potting epoxy has been
removed to show the PC board
and components.
Voltage Testing Hall Sensor at Control Board (See page 50.)
1. Unplug the power cord.
2. Remove the rear control panel cover.
3. Remove the top plate.
4. Remove the main board from the rear cabinet corner.
5. Identify the hall sensor connector on the main board, as shown on page 68, using
the wiring diagram and wire colors as your guide. (See wiring diagram and main
board photo, page 68.)
6. Plug in the power cord, close the door, and press POWER.
DO NOT PRESS START!
7. Place your meter leads on the WHITE and GRAY wires. You should read between
10 ~ 15 V
DC
output from the main board to the hall sensor. If 10 ~ 15 V
DC
are
not observed, the main board is defective.
8. Place your meter leads on the BLUE and GRAY wires. Turn the motor rotor slowly
by hand. You should measure a pulsing 10 V
DC
. Place your meter leads on the
RED and GRAY wires. Turn the motor rotor slowly by hand. You should measure a
pulsing 10 V
DC
.
If both of these tests measure a pulsing 10 V
DC
, the hall sensor and wiring
harness are OK. If either or both tests measures 9 ~ 10 V
DC
but does not pulse
or change, the hall sensor has failed and must be replaced.
If either test measures 0 (zero) voltage, check the red and blue wires for
continuity. Repair or replace the wiring harness as necessary.
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