Software in the machine control board specifically monitors the timer input circuits to determine where the timer is in all the wash cycles and will rapidly advance the timer to OPEN and break contacts in the timer. The timer is solely used as an
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| TIMER 1A | TIMER 1B | TIMER 2A | TIMER 2B |
| (120 VAC) | (120 VAC) | (24 VDC) | (24 VDC) |
CYCLE SEQUENCE | PK19/P7(8) | YL16/P7(7) | PU17/P3(3) | BU18/P3(5) |
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PREWASH TUMBLE | 0 | 1 | 1 | 0 |
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PREWASH DRAIN | 1 | 1 | 1 | 0 |
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MAIN WASH TUMBLE | 0 | 1 | 0 | 0 |
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LIGHT WA SH TUMBLE | 1 | 1 | 0 | 0 |
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BLEACH DISPENSE | 1 | 0 | 1 | 0 |
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RINSE TUMBLE | 1 | 0 | 0 | 1 |
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SPIN 1 | 0 | 0 | 1 | 0 |
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SPIN 2 | 0 | 0 | 0 | 1 |
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SPIN 3 | 0 | 1 | 0 | 1 |
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EXTRA RINSE | 1 | 1 | 0 | 1 |
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DELAY | 1 | 0 | 0 | 0 |
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IDLE | 0 | 0 | 0 | 0 |
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Key: 0 = Input Signal | Not Asserted | 1= Input | Signal Asserted |
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There are conditions under which the machine control will shut the cycle down if the timer does not advance.
-During Extra Wash/Prewash: If the timer inputs do not change away from Prewash
Tumble for 15 minutes, the machine control will open the line relay.
-During Main Wash: If the timer inputs do not change for 29 minutes, the machine
control will open the line relay.
-During any increment when the machine control energizes the timer motor until it sees the timer inputs change: If the timer inputs do not change for 5 minutes with the timer motor continuously energized, the machine control will open the line relay.
These varying delays are to allow the washer to progress through several increments where the timer inputs normally do not change. In these cases, the machine control energizes the timer motor for 30 seconds, which is its advance time. It does not look for a timer input change.
1 6 0 0 8 3 7 3 - 0 1 | SECTION 2. ELECTRICAL COMPONENTS & TESTING | 2 - 4 |
© 1998 Maytag Corporation
