Whirlpool W10254428A Manual page 20

FOR SERVICE TECHNICIAN'S USE ONLY
TEST #13: Expansion Board (EB) Power Check
Communicates with the CCU through the WIDE bus.
Receives 120VAC, +5 (Vcc) and –7VDC from the CCU. +12V (–7V to Vcc).
Detects the presence of the cartridge.
Detects the level of detergent within the cartridge.
Controls the pump to dispense detergent determined by the wash cycle.
EBP3-Expansion Board Power
Figure 14 - Expansion Board
This test checks for incoming power to the
Expansion Board (EB). This test assumes
that proper voltage is present at the CCU
(see TEST #1).
1. Unplug washer or disconnect power.
2. Remove top panel to access the machine
electronics.
3. Visually check that all connections to the
CCU and EB are fully inserted.
4. If visual check passes, continue to step 5.
5. Plug in washer or reconnect power.
IMPORTANT: Make sure door is closed and
locked.
NOTE: Line voltage to and from the EB can
only be measured when the detergent pump
is actuated. This occurs for approximately
1-5 seconds toward the end of the FILL cycle.
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= pin-1
CIN4-WIDE IN
DEP2-Detergent Pump
DPS2-Detergent
Presence Sensor
Connect the voltmeter as specified below, and
then select the Normal Wash cycle and press
START. Watch for line voltage toward the end
of the FILL cycle.
6. With a voltmeter set to AC, check for input
line voltage to the EB across pins 1 and 2 of
connector LPS2. (See NOTE at left.)
If line voltage is present, continue to step 8.
If line voltage is not present, go to step 7.
7. With a voltmeter set to AC, check for output
line voltage from the CCU across pins 1 and 2
of connector HSG2. (See NOTE above.)
If line voltage is present, check harnesses
and connections between the CCU and EB.
Repair as necessary.
If line voltage is not present, go to TEST
#1: CCU Power Check on page 12.
DO NOT REMOVE OR DESTROY
LPS2-AC IN
TOP
VIEW
SIDE
VIEW
DLS3-Detergent
Level Sensor