PAGE 22
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
4.
Unplug washer or disconnect power.
5.
Remove top panel to access machine
electronics.
6.
Visually check that the
DLS3
and
DPS3
connectors are inserted all the way into the EB.
Refer to EB diagram on page 20.
7.
Open the cover on the sensor module and
visually check that the
J1
connector is inserted
all the way into the Mini-bulk Sensor board.
If both visual checks pass, go to step 8.
If connector(s) are not inserted properly,
reconnect and perform step 2 to verify
repair.
8.
With an ohmmeter, check the harness
for continuity between the sensor and the EB.
If there is continuity, go to step 9.
If there is no continuity, repair or replace as
necessary. Perform step 2 to verify repair.
9.
Plug in washer or reconnect power.
10.
With a voltmeter set to
DC
, connect black
probe to the sensor module connector
J1-3
(GND) and red probe to
J1-1
(+5V [Vcc]).
If +5VDC is present, go to step 11.
If +5VDC is not present, perform TEST
#13: “Expansion Board Power Check” on
page 20. If test passes and +5 volts is still
not present at connector
J1
, replace the
expansion board.
11.
With a voltmeter set to
DC
, connect black
probe to the sensor module connector
J1-3
(GND) and red probe to
J1-5
(Presence Sensor
Output). Press the “Auto Dispense” button and
then measure the output voltage.
If the voltage range is greater than 0.25
volts and less than 4.75 volts, the sensor is
connected and functioning. Go to step 12.
If the voltage is less than 0.25 volts (short
to ground) or greater than 4.75 volts (short
to +5VDC), replace the sensor module.
12.
With a voltmeter set to
DC
, connect black
probe to the sensor module connector
J1-3
(GND) and red probe to
J1-2
(Level Sensor
Output). Press the “Auto Dispense” button
and then measure the output voltage.
If the voltage range is greater than 0.25
volts and less than 4.75 volts, the sensor is
connected and functioning. Go to step 13.
If the voltage is less than 0.25 volts (short
to ground) or greater than 4.75 volts (short
to +5VDC), replace the sensor module.
13.
Replace the Expansion Board.
Unplug washer or disconnect power.
Replace the EB.
Reassemble all parts and panels.
Perform step 2 to verify repair.
Figure 15 - Sensor Module Block Diagram
DLS3
DPS3
EXPANSION
BOARD
SENSOR MODULE
1
2
3
2
3
1
1
3
5
4
J1
Level Sensor Output
Ground
Vcc (+5)
Presence Sensor Output
Vcc (+5V)