Test #1: Ui/Control Board - Amana L-90 Service Manual

TESTING COMPONENT
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
Component Testing
TESTING WASHER COMPONENTS FROM THE
CONTROL
Before testing any of the components, perform the following
checks:
• The most common cause for mis-diagnosed control
failure is poor connections. Therefore, disconnecting,
inspecting and reconnecting wires will be necessary
throughout test procedures.
• All tests/checks should be made with a VOM or DVM
having a sensitivity of 20,000 ohms-per-volt DC, or
greater.
• Check all connections before replacing components,
looking for broken or loose wires, failed terminals, or
wires not pressed into connectors far enough.
• IMPORTANT: Voltage checks must be made with all
connectors attached to the boards.
• Resistance checks must be made with power cord
unplugged or power disconnected, and with wiring
harness or connectors disconnected from the control.
The testing procedures in this section may require the use
of needle probes to measure voltage. Failure to use needle
probes may damage the connectors.
3-4 Amana Compact Washer
n
For Service Technician Use Only

TEST #1: UI/Control Board

This test is performed if the washer does not power up or
is unresponsive. This test checks for incoming and outgoing
power to and from the UI (User Interface)/Control Board. This
test assumes that proper voltage is present at the outlet.
1. Unplug washer or disconnect power.
2. Access the UI/Control Board assembly.
3. Verify that ALL connectors are inserted all the way into the
UI/Control Board.
4. If visual checks pass, go to step 5.
5. Control AC - With a voltmeter set to AC, connect black
probe to CN1-3 (Neutral) and red probe to CN1-1 (L1).
6. Plug in washer or reconnect power.
¾ If 120 VAC is present, go to step 7.
¾ If 120 VAC is not present, check the AC power cord for
continuity (See Wiring Diagram, page 3-3.)
7. Unplug washer or disconnect power.
8. Control +5V - Test for 5 VDC. With a voltmeter set to DC,
connect black probe to CN6, pin 2 (Circuit Gnd) and red
probe to CN7, pin 3 (+5 VDC).
9. Plug in washer or reconnect power.
¾ If +5 VDC is present, the control board supplies are
good.
¾ If +5 VDC voltage is not present, go to step 10.
10. Unplug washer or disconnect power. One at a time,
disconnect the three (3) logic/low voltage connectors
(CN6, CN7, and CN8) as shown in Figure 1 on page 3-5.
Plug in washer or reconnect power and repeat step 9.
¾ If +5 VDC returns, the circuit related to the removed
connector may have malfunctioned or shorted.
Troubleshoot the circuit and retest.
¾ If +5 VDC is still not present, go to step 11.
11. The UI/Control Board has malfunctioned.
a. Unplug washer or disconnect power.
b. Replace the UI/Control Board.
c. Reassemble all parts and panels.
d. Plug in washer or reconnect power. Perform the
Manual Load Test to verify repair.
Continue to next page for UI/Control Board diagram
and Control Board connectors & pinouts