Maytag MTB1504ARW Operations Instructions download pdf (Page 30)

WARNING

To avoid risk of electrical shock that can cause death or severe personal injury, disconnect unit from power before

servicing unless tests require power. Discharge capacitors through a 10,000-ohm resistor before handling. Wires

removed during disassembly must be replaced on correct terminals to ensure proper grounding and polarization.

To minimize risk of personal injury and/or property

damage, read this section of the manual completely

before attempting any tests or adjustments.

CAUTION

Operation

When the thermostat senses temperature of 17 ±3°F

(-8 ±1°C), the thermostat closes. Current now has a

path through the thermostat to the motor (wiring

diagram

P. 41). The motor turns the drive gear. Electrical

contacts protruding from the module brush against

copper strips on the backside of the drive gear

(illustration P. 41). As the drive gear turns, the rotating

copper strips make and/or break connections between

the electrical contacts, controlling icemaker

operations.

Design of the ice maker allows testing of all

components without removing the ice maker or having

to access the water valve.

Remove the cover and you will see test points

identified on the module as N, M, V, etc.

N: Neutral side of line

M: Motor connection

H: Heater connection

T: Thermostat connection

L: L1 side of line

V: Water valve connection

Specifications

Mold Heater - 185 Watts, 264 Ohms

Thermostat - Close 17 ±3°F (-8 ±1°C)

(Bimetal) - Opens 32 ±3°F (0 ±1°C)

Water Fill - 140 cc, 7.5 Sec.

Motor Cycle - Stamped in circuit; plug-in connectors

- One revolution of blades take three

minutes plug stall time on ice (Eject

and Water Fill)

Test Procedures

Necessary preconditions: Ice maker plugged into

power; shut-off arm down; freezer not warmer than

2°F

1. Use voltmeter across test points L and N to verify

115 volts for ice maker module. Make sure test

probes go into test points at least 1/2" (1.3 cm).

2. Make a shunt: Get a 6" piece of 14-gauge wire.

Strip 1/2" of insulation off both ends and bend the

wire into a horseshoe shape (illustration P. 38).

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Maytag MTB1504ARW Operations Instructions Page 30

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