Maytag MAH5500BWW Service Manual - Page 30

Tachometer Cir, achometer Cir, achometer Circuit Diagnostics, cuit Diagnostics - size

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PHASE WIRE COLORS C Yellow or Orange B White or Red A Black or Blue MOTOR CONDITION RESULT/SOLUTION Runs Does Not Run Runs Does Not Run Runs Does Not Run -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) Tachometer Circuit Diagnostics The tachometer system of the motor is comprised of a plastic wheel, called a shutter, and an optical sensor (Figure 2-9). The shutter is 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 consists of six different "pickets" which are repeated eight times. An optical sensor is mounted to one side of the shutter and monitors 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 2-9 16008373-01 Figure 2-10 SECTION 2. ELECTRICAL COMPONENTS & TESTING 2-10 © 1998 Maytag Corporation

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© 1998 Maytag Corporation
16008373-01
SECTION 2.
ELECTRICAL COMPONENTS & TESTING
2-10
2-10
2-10
2-10
2-10
Tachometer Cir
achometer Cir
achometer Cir
achometer Cir
achometer Circuit Diagnostics
cuit Diagnostics
cuit Diagnostics
cuit Diagnostics
cuit Diagnostics
The tachometer system of the motor is com-
prised of a plastic wheel, called a shutter, and
an optical sensor
(Figure 2-9).
(Figure 2-9).
(Figure 2-9).
(Figure 2-9).
(Figure 2-9).
The shutter is
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).
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
PHASE
WIRE COLORS
MOTOR CONDITION
RESULT/SOLUTION
C
Yellow or Orange
Runs
Does Not Run
-Phases A&B are operating correctly.
(Check Phase A and B)
-Phase A or B is non-functional.
(See Step 10)
B
White or Red
Runs
Does Not Run
-Phases A&C are operating correctly.
(Check Phase A and C)
-Phase A or C is non-functional.
(See Step 10)
A
Black or Blue
Runs
Does Not Run
-Phases B&C are operating correctly.
(Check Phase B and C)
-Phase B or C is non-functional.
(See Step 10)