Maytag 16010061 service manual Tachometer Circuit Diagnostics

PHASE	WIRE COLORS	MOTOR CONDITION	RESULT/SOLUTION
C	Yellow or Orange	Runs	-Phases A&B are operating correctly.
		Does Not Run	(Check Phase A and B)
			-Phase A or B is non-functional.
			(See Step 10)
B	White or Red	Runs	-Phases A&C are operating correctly.
		Does Not Run	(Check Phase A and C)
			-Phase A or C is non-functional.
			(See Step 10)
A	Black or Blue	Runs	-Phases B&C are operating correctly.
		Does Not Run	(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 com- prised 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 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-Figure 2-9tors 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

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING 2-10

© 1998 Maytag Corporation