Whirlpool WFW94HEXW2, Руководство по устранению неисправностей, Страница: 14 / 52

PAGE 14
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
10. DC Supplies
• +5V DC is used to power IC’s and
processors on the circuit boards. If +5 V DC
was missing, the washer would become
unresponsive. To 5V DC ± 5%,
measure voltage at UI7 pin 7 (GND) to pin 2
(+5V [Vcc]). (Red lead to Vcc.)
•
+12V DC is used to actuate most of the
120V AC relays, triacs, and switches on the
CCU. If +12V DC was missing, the motors,
valves, and pumps would not turn on. To
12V DC ± 5%, measure voltage
at UI7 pin 3 (–7V) to pin 2 (+5V [Vcc]).
(Red lead to Vcc.)
Troubleshooting: Refer to the wiring diagrams
on pages 23–24 when troubleshooting the DC
supplies. If +5 or +12 V DC is missing on
the CCU, unplug washer or disconnect power,
and then disconnect all components from the
CCU relying on that supply. Plug in washer or
reconnect power and check if the DC supply
has returned. If not, replace the CCU. If it has,
turn washer off and reconnect one connector
at a time until the component loading down
that supply has been identified.
11. Unplug washer or disconnect power.
12. Reassemble all parts and panels.
13. Perform the “Quick Diagnostic Test”
on page 6 to verify repairs.
TEST #2: User Interface (UI)
This test is performed when any of the
following situations occurs during the
User Interface Test (see page 5):
3
None of the indicators or display turn on
3
Some buttons do not light indicators
3
No beep sound is heard
None of the indicators or display turn on:
1.
Unplug washer or disconnect power.
2. Remove the top panel to access the CCU.
3. Visually check that all CCU connectors are
inserted all the way into the CCU. See Figure 4.
4. Remove console assembly. Do not pull
on the wires between the console and CCU.
5. Visually check that all UI connectors are
inserted all the way into the UI. See Figure 5.
6. Visually check that the UI and housing
assembly is properly inserted into the front
console.
7. If all visual checks pass, perform TEST #1: CCU
Power Check, page 13, to verify supply voltages.

If supply voltages are present, replace the
user interface and housing assembly.

If supply voltages are not present, replace
the CCU.
8. Reassemble all parts and panels.
Figure 5 - User Interface (UI), Housing Assemblies, and Cabling
Console/Housing Assembly
P02 - to CCU
P02
P13 -
to
Drum
Light
P13
To Drum
Light
P12
P09
P08
P06
P07
To CCU
NOTE:
The User Interface (UI) must be replaced
as an assembly. The UI includes the Modifier
and Center PCBs, and housing assemblies.
Modifier PCB
Center PCB