Test Procedure
WARNING
Serious shock may occur. Open primary disconnect switch before attempting any repairs.
W447
1.The
2.Test equipment required:
a.20K OHM/Volt
b.Programmable computer diagram,
c.Display board diagram, drawing #2091
3.Power Up
a.When AC power is turned on, after
30 seconds the computer should read “NEXT”.
b.Door unlock solenoid should work if Door Unlock button is depressed.
c.If these are correct, go to step 5.
4.If computer does not read “NEXT” or does not light:
a.Examine display board; the door light (DR) should be on and all others off.
b.If not, check 2 AMP fuse on side of module.
c.Check for 115 volts AC between AC HOT (ACH) and AC NEUTRAL (ACN) at top center of display board. (Ref. Drawing #2091)
d.Be certain that all plugs are correctly installed on the computer board.
e.If all above check OK, remove the 6 pin plug
5.If computer reads “NEXT”:
a.Test the keypad, first with the keyed mode switch in the Run position. A beep tone should sound as each key is pressed.
Operation
NOTE: Keys should be pressed at their centers and only hard enough to activate them. With the computer showing “NEXT”, press each of the
15 keys not including the START key and listen for each beep. After pressing all 15 keys (except START), press 0 twice then press the START key. Display should read “NOGO00”.
b.When the DISPLAY TEMP. key is pressed, the computer display should change to show the temperature inside the sump. When key is released, the display should return to previous
c.Turn the keyed mode switch to Program and press “Display/Cycle”.
d.Press the CLEAR/STOP key. Display should return to “NEXT”.
e.Return Mode switch to the Run position.
6.If keypad does not function as above:
a.Check the plug at the bottom center of computer board for proper installation.
b.If the plug is correct, proceed to “Replacing Keypad” section.
7.Test Cycle
a.Cycle 01 is a preprogrammed test cycle. If it has not been erased, it may be used to check all functions of the machine.
b.Start this cycle by pressing 0, then 1, then the START key.
c.Display should show “CL01” with two dots indicating water valves turned on. (Refer to Table 1.)
d.On the display/fuse board inside the control module, these lights should be lit: Cold Fill (CF), Cold Spray (CS), Drain (DN), plus Forward (FW) and Reverse (RV) should alternate on and off. (Ref. Drawing No. 2091)
e.Printed program will indicate which lights to expect for each step. (Ref. Cycle 01 as shown in this manual)
8.If
a.Check 2 AMP fuse and door hinge microswitch.
b.Check thermal overload indicator light on side of control module. If lit, thermal overload circuit is open.
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