Refrigerator Light Switch; Drier; Defrost Timer - Maytag ATB1504ARQ Service Manual

Component Testing
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
Component Description
Switch, refrigerator Single pole, single throw switch
light completes circuit for light when door is
open.

Drier

Drier is placed at post condenser loop
outlet and passes liquefied refrigerant to
capillary.
Desiccant (20) 8 x 12 4AXH - 7 M>S> -
Grams

Defrost timer

Timer motor operates only when fresh
food control is closed.
After specified amount of actual
operating time, inner cam in timer throws
the contacts from terminal 4, compressor
circuit, to terminal 2, defrost
thermostat/defrost heater circuit.
After specified defrost cycle time, timer
cam resets the circuitry through terminal
4 to compressor.
16022675
!
WARNING
Test Procedures
Check resistant across terminals.
Switch arm depressed
"NO" terminals
Switch arm up
"NO" terminals
Drier must be changed every time the system is opened for testing or
compressor replacement.
NOTE: Drier used in R12 sealed system is not interchangeable with
drier used in R134a sealed system.
Before opening refrigeration system, recover HFC134a refrigerant for safe
disposal.
1. Cut drier out of system using the following procedure. Do not unbraze
drier since this will drive moisture into the system.
2. Score capillary tube close to drier and break. Reform inlet tube to drier
allowing enough space for large tube cutter.
3. Cut circumference of drier 1 ¼" below condenser inlet tube joint to
drier.
4. Remove drier.
5. Apply heat trap paste on post condenser tubes to protect grommets
from high heat.
6. Unbraze remaining part of drier. Remove drier from system.
7. Discard drier in safe place. Do not leave drier with customer. If
refrigerator is under warranty, old drier must accompany warranty
claim.
To avoid death or severe personal injury, cut drier at correct location.
Cutting drier at incorrect location will allow desiccant beads to scatter. If
spilled, completely clean area of beads.
1. To check timer motor winding, check for continuity between terminals 1 and 3
of timer.
2. Depending on rotating position of the cam, terminal 1 of timer is common to
both terminal 2, the defrost mode, and terminal 4, the compressor mode.
There should never be continuity between terminals 2 and 4.
3. With continuity between terminals 1 and 4, rotate timer knob clockwise until
audible click is heard. When the click is heard, reading between terminals 1
and 4 should be infinite and there should be continuity between terminals 1
and 2.
4. Continuing to rotate time knob until a second click is heard should restore
circuit between terminals 1 and 4.
8
Open
Closed
!
WARNING
©2003 Maytag Appliances Company