| Re: [GMCnet] 115V Refrigerator Again? [message #201505] |
Wed, 13 March 2013 07:32  |
Dave
Messages: 32
Registered: March 2004
Karma: 3
|
Member |
|
|
At 02:35 AM 3/8/2013, Patrick Fitzmorris wrote:
>Bruce, if I could get a schematic for that board you made, that'd be
>pretty cool. Though, I may try resurrecting the original inverter.
I posted the Norcold inverter schematic a while back:
http://www.gmcmhphotos.com/photos/member-galleries/p20004-all-electric-norcold-c.html
The OEM inverter board is pretty easy to refurbish. If you replace
the power transistors and the electrolytic capacitors it will usually
fix the board and keep it running long term.
If you decide to use an external inverter there is no need to replace
the OEM transformer. The inverter board has a 110v input. No need to
rewire anything to use 110v. Mine did not have a power cord attached.
I added the power cord so I could use a cheap external inverter if I
ever have a failure again while I am on the road. It has been 20
years since I repaired the OEM inverter and I have never had to use
the 110v power cord.
Dave
Ann Arbor, MI.
73 Sequoia (26'/455/EbH/RwI/ThH/HEI/TBI/160°/3.42/100A/Q55G)
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] 115V Refrigerator Again? [message #201591 is a reply to message #201505] |
Wed, 13 March 2013 15:27  |
 |
fitzmorrispr
Messages: 137
Registered: February 2013
Location: Los Angeles
Karma: 0
|
Senior Member |
|
|
Dave,
ah, that's good! Got some quick questions: is that number in the top left
of the schematic a part number?
And, do the transistors really need replacing, or would replacing the caps
get it going again? Could it be that neither are bad, and it's just one of
the relays got stuck? while it is 40 years old, my fridge doesn't have much
use on it. the coach itself has only 62k miles, the genset 200 hours (so
like 5hr/year). I figure the fridge is similarly under-used
Mine's already wired up to 110v, and the problem is it runs on that just
fine, but won't switch to 12v. Perhaps my 12v system's just not good
enough? (it is marginal, the batteries go dead if I run the bathroom light
for two hours while working on the plumbing)
On Wed, Mar 13, 2013 at 5:32 AM, Dave <DaveM@mich.com> wrote:
> At 02:35 AM 3/8/2013, Patrick Fitzmorris wrote:
> >Bruce, if I could get a schematic for that board you made, that'd be
> >pretty cool. Though, I may try resurrecting the original inverter.
>
> I posted the Norcold inverter schematic a while back:
>
>
> http://www.gmcmhphotos.com/photos/member-galleries/p20004-all-electric-norcold-c.html
>
> The OEM inverter board is pretty easy to refurbish. If you replace
> the power transistors and the electrolytic capacitors it will usually
> fix the board and keep it running long term.
>
> If you decide to use an external inverter there is no need to replace
> the OEM transformer. The inverter board has a 110v input. No need to
> rewire anything to use 110v. Mine did not have a power cord attached.
> I added the power cord so I could use a cheap external inverter if I
> ever have a failure again while I am on the road. It has been 20
> years since I repaired the OEM inverter and I have never had to use
> the 110v power cord.
>
>
> Dave
> Ann Arbor, MI.
> 73 Sequoia (26'/455/EbH/RwI/ThH/HEI/TBI/160°/3.42/100A/Q55G)
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
The Greatfruit: 1973, 26', Canyon Lands or Painted Desert, in Pineapple Yellow
|
|
|
|
| Re: [GMCnet] 115V Refrigerator Again? [message #201615 is a reply to message #201591] |
Wed, 13 March 2013 20:13 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
| fitzmorrispr wrote on Wed, 13 March 2013 16:27 |
Dave,
ah, that's good! Got some quick questions: is that number in the top left of the schematic a part number?
And, do the transistors really need replacing, or would replacing the caps get it going again? Could it be that neither are bad, and it's just one of the relays got stuck? while it is 40 years old, my fridge doesn't have much use on it. the coach itself has only 62k miles, the genset 200 hours (so like 5hr/year). I figure the fridge is similarly under-used
Mine's already wired up to 110v, and the problem is it runs on that just fine, but won't switch to 12v. Perhaps my 12v system's just not good enough? (it is marginal, the batteries go dead if I run the bathroom light for two hours while working on the plumbing)
|
Patrick,
You said it will run on 110, so the relay is good. 110 pulls it in. This does not mean it can't have failed, it just is not one of your better bets.
I do a lot of repair on old electronics and there are others here that may do more.
Were I you, I would study the board enough to identify the two capacitors and pull and test both. Old electrolytic caps very often go south. They are also very easy to get and inexpensive.
The transistors are unlikely to fail on their own.
Good Luck Guy.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
