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Plug In Systems Pms1 Power Unit


bddeazeley

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Hi Folks, I am trying to solve a problem for my old neighbour who has an older Coachman caravan. His 12 volt system has packed up although the Plug in Systems PMS1 power unit still supplies 240 volt. He has checked out the fuses etc and they are fine so the problem lies within the PMS1 power unit. I have not opened his power unit up as yet as it has a riveted cover and would prefer some information on this unit before venturing forward. I did the usual Googling etc and many people appear to have been looking for information on these Plug in Systems circuit diagrams. I would suspect the regulator circuit has went u/s so hopefully it is repairable. Do any members have any technical diagrams etc or ever experienced repairs to the PMS1 which appears to have been a very popular unit in it's day. A solution will help out an 'old timer'.

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The PMS number only refers to it's shape, the one is designed to fit under a bunk or at the back of the wardrobe, most others being for out in the open on display, apart form that internally they are all the same.

 

The internal 12v switch mode transformers changed design/manufacturer several times but all fit the same footprint and are interchangeable

 

So get drilling! you need a sharp 3. 5mm drill and you will find it useful to punch out the old broken pins before you start drilling, also make doubly sure you account for all the remains of the old rivets.

gary1s.gif

 

Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters.

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The same happened to me. Ex Plug in Steve I believe was the name I googled and you got a new board with rivets and even the drill bit. It was £90 all in.

 

 

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Thanks for the quick replies and the information. Being a retired TV/Video service engineer my first instinct is to repair the PCB rather than replace it as components cost very little compared to the mark up on new PCB's. It is an under the bunk version and I will investigate it further. A unit from a scrapped 'van may be the way forward but again some dismantlers charge hefty prices for such parts although I now have the option to use a PCB from a different model number. I have rigged my neighbour's van pump and 12 volt lights meantime to work direct off the battery. I will let you know the final outcome.

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