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Post by jukenorman on Nov 13, 2023 11:26:57 GMT
The solenoid has a dedicated fuse, did you check that? Otherwise, wiring break or the coil open circuit maybe?
Norman.
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Post by joetop on Nov 13, 2023 11:34:39 GMT
Norman thanks for that but sometimes it works fine and sometimes it doesn't. I'd have thought a fuse fault or wiring break would be a hard fault.
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Post by jukenorman on Nov 13, 2023 14:55:27 GMT
Sorry I misunderstood! Do you have the schematic? There are contacts of the pulse control relay and sprag relay in the circuit, you may need to check these?
Norman.
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Post by joetop on Nov 13, 2023 15:17:36 GMT
Yes I have the manual. I'll take a look at those. Thanks. Joe
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Post by joetop on Nov 14, 2023 12:44:55 GMT
Hi Norman Having cleaned the contacts on the pulse control relay and the sprag relay I now have the reverse condition. The latch solenoid gets energised but is not released meaning the selection buttons wont lock in. I noticed that the pulse relay does not energise on start up whereas I think the manual suggests it should. Do you think this could be the problem? Joe
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Post by jukenorman on Nov 14, 2023 15:32:00 GMT
Hi Joe,
Yes the pulse control relay is energised via a normally closed contact of the sprag relay. Because the pulse control relay is not energised, that in turn is preventing the latch relay from energising - which is why the latch solenoid is energised. Back to the sprag relay!
Norman.
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Post by joetop on Nov 14, 2023 16:55:28 GMT
Hi Norman
There are 3 sets of contacts on the sprag relay and all three are closed and remain closed on power up. I've cleaned them again and still no luck. Out of desperation I also cleaned the credit circuit board and wipers even though they have never haven't been touched in the time I've had the machine. Running out of ideas.By cleaning the sprag relay and pulse control relay contacts I seem to have induced a hard fault but everything about those relays appears to be working fine.
Joe
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Post by jukenorman on Nov 14, 2023 19:34:36 GMT
Hi Joe,
If you look at the schematic, you will see that one side of the pulse control relay coil (R2) is connected to common (ie ground or earth). The other side of the coil is routed through a normally closed contact of the sprag relay (strictly speaking, it's the closed side of a changeover contact) and through the on/off mech switch to DC+.
There are some very minor circuit differences between the K/Conti1/Conti2 but the pulse control relay coil circuit is always the same. I think it would be unlikely that the relay coil has just gone open circuit but you could check for voltage there. Might there have been a wire in that circuit that has become detached? The only other thing I can suggest is to make up a little lamp tester - I use an old pinball lamp and a 9V battery and that would show whether your sprag relay contacts were current limiting despite your best cleaning efforts!
Norman.
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Post by joetop on Nov 16, 2023 12:26:48 GMT
Hi Norman
Yep cleaned everything again with a different contact cleaner and it's burst into life. Thanks for your help.
Joe
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Post by joetop on Nov 16, 2023 12:27:47 GMT
Hi Norman
Yep cleaned everything again with a different contact cleaner and it's burst into life. Thanks for your help.
Joe
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