Component Testing Procedures - Maytag MAT12PDSA Technical Information

Component Testing Procedures

To avoid risk of electrical shock, personal injury or death; disconnect power to washer before servicing, unless
testing requires power.
Illustration
Step-Down
Transformer
Coin sensor
Water Valve
Motor
Pump
Transmission
Belts
Lid Switch (series 15)
December 2003
!
Component
Check voltage.
Primary Side:---------------------------------
Secondary Side:
AA6-1 to AA6-2------------------------------
AA6-1to AA6-5 -----------------------------
AA6-2 to AA6-5-----------------------------
AA6-3 to AA6-6------------------------------
Check for coin registering.
Coin Sensor Voltage Checks:
1) Blocked- White to Red-----------------
2) Unblocked- White to Red--------------
3) Continuously- Blue to White /Blue---
Measure resistance across the
terminals of each coil on the valve.
Measure resistance across thermistor
terminals water temperature (60°F -
140°F degrees).
Type of Motor:
Single speed (Split phase)
Verify drain pump is not clogged or
damaged.
Type of transmission (orbital):
618 r.p.m. Spin
150 o.p.m. Agitate
Check wattage with full tub of water
only (Use Wattage Meter).
Check belt for excessive wear or being
burnt and cracking.
Check for Continuity between the
following terminals:
Line to Machine (Lid Open) --------------
Line to Motor (Lid Closed)----------------
Line to Machine (Lid open or Closed)--
WARNING
Test Procedure
3
Results
120 VAC
2.65 VAC
2.65 VAC
5.3 VAC
22.5 VAC
Display flashes an "*" in "Service Mode".
23 VDC
0.6 VDC
1.5VDC Note: Replace sensor if voltage
is 23VDC (Open Diode),or 0 VDC
(Shorted Diode),
Approximately 850-950 Ω
Approximately 10K-85KΩ
See "Motor Testing" section for
correct wiring contact.
1) Remove clog and verify proper
operation.
2) Replace drain pump if damaged.
See section on "Transmission"
disassembly procedures in base
manual.
380 to 420 watts
Replace if belt if damaged.
Closed Circuit
Closed Circuit
Closed Circuit, If not replace lid switch.
16022846 Rev 0