Maytag Neptune MAH3000 Service Manual page 30

PHASE WIRE COLORS
C Yellow or Orange
B White or Red
A Black or Blue
T T T T T achometer Cir achometer Cir achometer Cir achometer Circuit Diagnostics cuit Diagnostics cuit Diagnostics cuit Diagnostics
achometer Cir cuit Diagnostics
The tachometer system of the motor is com-
prised of a plastic wheel, called a shutter, and
(Figure 2-9). The shutter is (Figure 2-9). (Figure 2-9).
an optical sensor (Figure 2-9). (Figure 2-9).
mounted to the end of the motor shaft under
the plastic endbell covering of the motor. The
edge of the shutter resembles a "picket fence"
with different size "pickets." The pattern con-
sists of six different "pickets" which are re-
peated eight times. An optical sensor is
mounted to one side of the shutter and moni-
tors the "pickets" as they pass through the
sensor.
As the "pickets" pass through the sensor field,
signals are generated and transmitted to the
motor control board through the tachometer
wire harness (Figure 2-10 and 2-11). (Figure 2-10 and 2-11). (Figure 2-10 and 2-11). (Figure 2-10 and 2-11). (Figure 2-10 and 2-11).
16008373-01
MOTOR CONDITION
Runs
Does Not Run
Runs
Does Not Run
Runs
Does Not Run
SECTION 2. ELECTRICAL COMPONENTS & TESTING
© 1998 Maytag Corporation
RESULT/SOLUTION
-Phases A&B are operating correctly.
(Check Phase A and B)
-Phase A or B is non-functional.
(See Step 10)
-Phases A&C are operating correctly.
(Check Phase A and C)
-Phase A or C is non-functional.
(See Step 10)
-Phases B&C are operating correctly.
(Check Phase B and C)
-Phase B or C is non-functional.
(See Step 10)
Figure 2-9 Figure 2-9 Figure 2-9 Figure 2-9 Figure 2-9
Figure 2-10 Figure 2-10 Figure 2-10 Figure 2-10 Figure 2-10
2-10 2-10 2-10 2-10 2-10