Whirlpool WFC8090GX, Service Manual, Page: 36 / 82

3-6
n
Whirlpool Smart All-In-One Washer & Dryer
COMPONENT TESTING
For Service Technician Use Only
TEST #2: Human-Machine Interface
(HMI)
This test is performed when any of the following situations
occurs during the Service Diagnostic Mode Tests (see page
2-3): display does not turn on and/or no sound is heard.
1. Unplug washer or disconnect power.
2. Gently lay washer/dryer on its right side to access the
ACU. Remove AC shield and ACU cover.
3. Visually check that all ACU connectors are inserted all the
way into the ACU. See Figure 2, page 3-5.
4. Visually check that all HMI connectors are inserted all the
way into the HMI (see Figure 2 below).
5. If all visual checks pass, perform TEST #1: ACU Power
Check, page 3-4, to verify supply voltage and health of
micro-controller.
¾
If supply voltages are present and micro-controller
is functioning properly, replace the HMI and housing
assembly.
¾
If supply voltages are not present, replace the ACU.
6. Reassemble all parts and panels.
7. Plug in washer/dryer or reconnect power.
8. Perform the Service Diagnostic Mode Tests on page 2-3 to
verify repair.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.
HUMAN-MACHINE INTERFACE (HMI)
Figure 2 - Connector Locations on HMI
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DES TROY
10. Check HMI input voltage:
Verify that there is
5V between pin 1 and 4
at J16.
¾
If there is 5V, go to step 11.
¾
If there is not 5V, disconnect J16 and
check for 15V between pin ? and pin ?.
If there is not 15V, replace the ACU.
11. Unplug washer/dryer or disconnect power.
12. Reassemble all parts and panels.
13. Perform the Service Diagnostic Mode
Tests on page 5 to verify repairs.
TEST #2: Human-Machine
Interface (HMI)
This test is performed when any of the
following situations occurs during the
Service Diagnostic Mode Tests (see page 5):
display does not turn on and/or no sound
is heard.
1. Unplug washer or disconnect power.
2. Gently lay washer/dryer on its right side
to access the ACU.
3. Visually check that all ACU connectors are
inserted all the way into the ACU. See Figure 3,
page 10.
4. Visually check that all HMI connectors
are inserted all the way into the HMI.
5. If all visual checks pass, perform TEST #1:
ACU Power Check, page 10, to verify supply
voltage and health of microcontroller.
¾
If supply voltages are present and
microcontroller is functioning properly,
replace the HMI and housing assembly.
¾
If supply voltages are not present,
replace the ACU.
6. Reassemble all parts and panels.
7. Plug in washer/dryer or reconnect power.
8. Perform the Service Diagnostic Mode
Tests on page 5 to verify repair.
Figure 4 - Human-Machine Interface (HMI) and Housing Assembly
ACU Input
(3 pin
connector)
Speaker
ACU Input
(3 pin connector)
Speaker
Connector
To Drum LED
ACU
HMI (HUMAN-MACHINE INTERFACE
HMI
CN1-1 J16-4
GND
CN1-4
J16-3
+12.7 VDC
CN1-3 J16-2
+5 VDC
CN1-2
J16-1
WIN
GND
OPEN
WIN
+12.7 VDC
Figure 1 - Human-Machine Interface (HMI) Strip Circuit