Alliance Laundry Systems BU170S Service Manual Page 115

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70422201R1
113
LED OPL and UniLinc Troubleshooting
Reverse Motor Test “
This option shows the reverse motor running.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start ( ) keypad. The display
will show “

” to indicate the reverse motor is
going to run.
The test must run for at least six seconds before it can
be exited and off for six seconds before the test can be
run again.
NOTE: This test does not count towards the total
machine run time operation.
To exit Reverse Motor Test, press the Back ( )
keypad. The control will return to the testing mode.
Rotation Sensor Test “
This option shows the RPM of the tumble dryer
cylinder.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start keypad. The display will show

”. The display is updated every ten seconds.
The test must run for at least six seconds before it can
be exited and off for six seconds before the test can be
run again.
NOTE: This test does not count towards the total
machine run time operation.
To exit Rotation Sensor Test, press the Back ( )
keypad. The control will return to the testing mode.
Moisture Sensor Test (Shorted Test
Jumper) “
This step is skipped if the control is not configured for
Moisture Sensing. When entering this test, the control
will show “
 
” while flashing the Start LED one
second on/one second off, allowing the user to short
the cylinder to the baffle (orange jumper). When the
Start key is pressed, this test step energizes the Fan
Motor Contactor and Forward Motor Contactor and
the control will show “

”. The moisture sensor
test is 30 seconds. During this 30 second period, the
control is continually monitoring the moisture sensor
input for the expected short circuit. If an intermittent
signal or high resistance is sensed before the 30
seconds expire, the test is terminated and the control
will show “

”, indicating that the test has
failed. At this time the user has the option to press the
Back ( ) keypad to return and run the test again. If the
control ran the whole test reading the expected
moisture sensor level and without an intermittent
signal or high resistance, “

” will be shown. If
either the loading or lint doors are opened during the
test, the control will reset the test step and allow it to
be run again. When the test is complete and result is
displayed, the control sounds a 5 second audio signal.
Press a key to advance to the next test step. If the
Up ( ) or Down ( ) keypad is pressed while the test
is in progress the control will toggle between displays

”, “
 
” and “

”. If the display is
left on “
 
” or “

” for 5 seconds the
control will revert to showing “
 
”.
Moisture Sensor Test (Resistance Test
Jumper) “
This step is skipped if the control is not configured for
Moisture Sensing. When entering this test, the control
will show “
 
” while flashing the Start key LED
one second on/one second off, allowing the user to
place the 510k Ohm resistor between the cylinder and
the baffle (black jumper) which simulates an expected
moisture sensor level. When the Start keypad is
pressed, this step energizes the Fan Motor Contactor
and Forward Motor Contactor and the control will
show “

”. The moisture sensor test is 30
seconds. During this 30 second period, the control is
continually monitoring the moisture sensor input for
the expected moisture sensor level. If an intermittent
signal or unexpected resistance is sensed before the
time expires, the test is terminated and the control will
show “

”, indicating that the test has failed. At
this time, the user has the option to press the Back ( )
keypad to return and run the test again. If the control
ran the test reading the expected moisture sensor level
and without an inttermittent signal or unexpected
resistance, “

” will be shown. If either the
loading or lint doors are opened during the test, the
control will reset the test step and allow it to be run
again. When the test is complete and result is
displayed, the control sounds a 5 second audio signal.
Press a key to advance to the next test step. If the
Up ( ) or Down ( ) keypad is pressed while the test
is in progress the control will toggle between

”, “
 
” and “

”. If the display is
left on “
 
” or “

” for 5 seconds the
control will revert to showing “
 
”.
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