Whirlpool WFW3090GW, Руководство по обслуживанию, Страница: 34 / 70

3-4
n
Whirlpool Compact Front Load Washer
TESTING COMPONENT
For Service Technician Use Only
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.
IMPORTANT: Whenever the washer is tilted for service or
troubleshooting, drain water from the basket and remove any
load items in the basket.
TEST #1: ACU Power Check
This test checks for incoming and outgoing power to and from
Appliance Control Unit (ACU). This test assumes that proper
voltage is present at the outlet.
1. Unplug washer or disconnect power.
2. Gently lay washer on its right side to access the ACU.
3. Visually check that all connections to the interference
filter (IF) are securely connected. See Figure 1, page 3-4.
4. Visually check that all connections to the ACU are fully
inserted. See Figure 2, page 3-5.
5. If both visual checks pass, go to step 6.
6. Plug in washer or reconnect power.
7. With a voltmeter set to
AC , check for line voltage at the
input of the interference filter. See Figure 1, page 3-4.
¾
If line voltage is present, go to step 8.
¾
If line voltage is not present, verify the continuity of
the power cord. If it fails the continuity check, replace
the power cord.
8. With a voltmeter set to AC, check for line voltage at the
output of the interference filter. See Figure 1, page 3-4.
¾
If line voltage is present, go to step 9.
¾
If line voltage is not present, replace the interference
filter.
9. With a voltmeter set to AC , check for input line voltage to
the ACU across pins 1 and 2 of connector J42 AC Input (IF).
See Figure 2, page 3-5.
¾
If line voltage is present, go to step 10.
¾
If line voltage is not present, check harnesses and
connections between the filter and the ACU. Visually
inspect inside connector housing for bent or damaged
terminals. Repair as necessary.
10. Check UI input voltage:
Verify that there is 5V between pin 10 and 12 at J21 .
¾
If there is 5V, go to step 11.
¾
If there is not 5V, disconnect J21 and check for 15V
between pin 9 and pin 12. If there is not 15V, replace
the ACU.
11. Unplug washer or disconnect power.
12. Reassemble all parts and panels.
13. Perform the Service Test Cycle on pages 2-4 and 2-5 to
verify repairs.
INTERFERENCE FILTER (IF) - FIGURE 1
Filter Input - Power Cord Neutral (WT)
Filter Output - Neutral (BU)
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
TEST PROCEDURES
IMPORTANT: The following procedures
may require the use of needle probes
to measure voltage. Failure to use needle
probes will damage the connectors. To
ease the process of measuring voltage
and resistance, test points for each pin are
accessible through the slots in the plastic
beneath each ACU connector.
TEST #1: ACU Power Check
This test checks for incoming and outgoing power
to and from Appliance Control Unit (ACU). This test
assumes that proper voltage is present at the outlet.
1. Unplug washer or disconnect power.
2. Gently lay washer on its right side
to access the ACU.
3. Visually check that all connections to the
interference filter (IF) are securely connected.
See Figure 2, below.
4. Visually check that all connections to the
ACU are fully inserted. See Figure 3, below.
5. If both visual checks pass, go to step 6.
6. Plug in washer or reconnect power.
7. With a voltmeter set to AC, check for line
voltage at the input of the interference filter.
See Figure 2.
¾
If line voltage is present, go to step 8.
¾
If line voltage is not present, verify the
continuity of the power cord. If it fails the
continuity check, replace the power cord.
8. With a voltmeter set to AC, check for line
voltage at the output of the interference filter.
See Figure 2.
¾
If line voltage is present, go to step 9.
¾
If line voltage is not present, replace the
interference filter.
9. With a voltmeter set to AC, check for input
line voltage to the ACU across pins 1 and 2
of connector J42 AC Input (IF). See Figure 3.
¾
If line voltage is present, go to step 10.
¾
If line voltage is not present, check
harnesses and connections between the
filter and the ACU. Visually inspect inside
connector housing for bent or damaged
terminals. Repair as necessary.
Figure 3 - Appliance Control Unit (ACU)
Figure 2 - Interference Filter (IF)
Filter Output - Line (BU)
Filter Input - Power Cord Line (BK) Filter Input - Power Cord Neutral (WT)
Filter Output - Neutral (BU)
J15-Inlet Valve
(1,2,3)
Drain Pump
(5,6)
1
2
3
5
6
WV-DP
1
2
3
MOT
J36-Motor
1
2
HE
J41-Heater
1
2
IF
J42-AC Input
1
2
3
DSS
J43-Door Lock/
Switch
J21-User
Interface
(CUIO)
(12,11,10,9)
APS
(7,6,5)
12
11
10
9
7
6
5
SB-PRS-UI
3
4
AQS-NTC
J23-NTC
(3,4)
Filter Output - Line (BU)
Filter Input - Power Cord Line (BK)