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Shark Rotator Powered Lift-Away XL Capacity, model NV755. It can convert from a push vacuum to a hand-held vacuum. Repairs and troubleshooting found here may also be applicable to models NV652 and NV752.

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Shark NV752 vacuum Motherboard

We have power to the brush and power to the light. Main suction motor does not run. We meter power going into the small board before the motor, but no power detected going out. Is this a replaceable board?

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Hi,

Don't know if there is a replacement board or not but post some close up pictures of both sides of the small board and perhaps someone may spot something or advise how to test it.

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Hi,

I can’t find a replacement board online using the board number or the model number but perhaps you may be able to check a few things on the board itself.

The major black component marked brf ss 124dm shown in image 1 is a 24V relay which I suspect operates to connect power to the motor. Here are the specifications for the relay which may be of some help.

Looking at image #1, did you test the fuse (F1 on board) with an Ohmmeter to maker sure that it is OK.

Totally disconnect the power from the cleaner when testing with an Ohmmeter.

Also see the image below where I have indicated what to me looks like suspect solder joints, that you may wish to check to ensure that they are not “dry” solder joints i.e. open circuit. Re-solder them if necessary.

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(click on image to enlarge for better viewing)

Check that you can hear the relay operate (click) when you go to turn on the motor. If not, with the power totally disconnected test the relay coil using an Ohmmeter, (1600 Ohms).

Also test D14 (diode) and ZD11 (zener diode) to check that they are not open circuit. When testing diodes you may have to disconnect one leg from the board to get an accurate test (low resistance in one direction, very high resistance in the other direction)

If you can’t hear the relay operate and the relay coil and diodes test OK it may be a case of tracing the relay coil operate circuit to find out why it doesn’t operate when power is applied to the board. Slow process without a schematic ;-)

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Thanks for the review! The fuse did check good. I appreciate the advise and I will check on the solder condition later this week.

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rtg2006 will be eternally grateful.
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