TROUBLESHOOTING & REPAIR
TOC | TOC | ABNORMAL SOLENOID PULL & HOLD COIL WAVEFORMS | |||
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TOC | TOC |
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Returnto Section | Returnto Master | SCOPE SETTINGS | SCOPE SETTINGS | ||
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| 1V | 20 ms | 200 MV | 5 ms |
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| Volts/Div | 1V/Div. | Volts/Div | 200 MV/Div. |
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| Horizontal Sweep ... | 20 ms/Div. | Horizontal Sweep | 5 ms/Div. |
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| Coupling | DC | Coupling | DC |
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| Trigger | Internal | Trigger | Internal |
TOC | TOC | The scope pictures above are exam- | |
Section | Master | ||
ples of a short at the output of both | |||
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| the pull and the hold coil circuits on | |
to | to | the control PC board. The overcur- | |
rent circuits in the pull and hold coil | |||
Return | Return | ||
circuits will shut down the circuit when | |||
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| an overcurrent is sensed, preventing | |
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| damage to the circuit. The waveform | |
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| on the left will cause the solenoid to | |
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| not pull in. The waveform on the right | |
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| will cause the solenoid to pull in, then | |
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| drop out. Check for shorted solenoid | |
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| coils and grounded leads. | |
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