Zanussi Jet system JFL 1023 motor problem

[ritchie]

Hi,

The motor on my otherwise wonderful machine recently started cutting out. I've replaced the brushes, which were worn out, but the problem remains.

The motor seems to energize (it hums when spin cycle is selected,) but only actually spins if I give the drum a shove. It then runs, but not at full speed, and sounds like it cuts in and out, as if there's a loose or worn electrical connection somewhere.
One other clue - the spin rpm speed control slider makes no difference to the motor speed...
I'll check the continuity to the motor, but in the meantime, has anyone got any suggestions.
The machine has been used once every week for the last 27 years with medium loads of washing...

Any advice really appreciated,

Thanks

Ritchie

 

[davetranter]

General thoughts

Sounds like a 'dodgy' connection somewhere. Check the connections to the variable speed control, and also the tachogenerator on the back of the motor. I've never worked on this particular model, but would recommend that you check the internal resistance values of the speed control, too, if you have access to an Ohmmeter. It seems to me that the controller is being 'confused' by the lack of a 'speed control' signal, and is doing nothing until you supply it with a tachogenerator signal by turning the drum. Presumably the systems are designed to 'fail safe', and that may be what is happening.

Anyone else got any ideas/experience??

All best

Dave T

P.S. I asked the membership at large about the 'internal workings' of motor control boards some time ago. It appears that there is very litle knowledge 'out there'. If a board seems faulty, testing by substitution seems to be the order of the day.

 

[triumphtoledo]

Maybe...

...a faulty capacitor?

 

[hotpoint9534]

Hi Ritchie,

There could be a loose connection somewhere, but I would also check the commutator for wear and possible raised segments. Sometimes the new brushes don't bed in easily if the commutator is worn. You could try using a fine sandpaper to clean the commutator as well. If it's not the motor at fault, then it could be the electronic speed controller (PCB).

There's no start/run capacitor on these.

Tom

 

[e685x]

Is there any way to have a circuit diagram of the motor PCB please?

 

[hotpoint9534]

I don't think so. If it's model ZFL1023 we're talking about, it takes an AKO C308 PCB. There's a picture in the link below.

Tom

http://https//emwelec.co.uk/index.php?l=product_detail&p=88