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Ge monogram ZGU385NSM2SS pesky transformer


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23 replies to this topic

#1 johntech

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Posted 11 August 2013 - 04:58 PM

Ge gas cooktop no spark. The transformer was not giving any output I replaced the transformer the new one sparked for about 1 minute then failed and tested bad on the primary windings. Did I just get a bad transformer or do I have another problem?

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#2 tpoindexter

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Posted 11 August 2013 - 05:36 PM

http://appliantology...steel-cooktops/


Test

#3 RegUS_PatOff

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Posted 11 August 2013 - 05:50 PM

which winding on the Transformer "opens"

Secondary pins 1, 2, 3 ?

"blows" when a certain Burner is turned ON ?


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#4 johntech

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Posted 11 August 2013 - 06:06 PM

With transformer discon I get nothing on the primary windings. I'm a little green at this so bear with me.

#5 RegUS_PatOff

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Posted 11 August 2013 - 06:09 PM

With transformer discon I get nothing on the primary windings. I'm a little green at this so bear with me.

Primary winding OHMs ?

but all (3) secondary winding OHM OK ?


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one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
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#6 tpoindexter

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Posted 11 August 2013 - 06:12 PM

Disconnect the 2 power supply wires and the
transformer wire harness.
Check the primary winding for approximate
resistance value of 32.8 Ω between the 2 brown
(input) wires.
Check the secondary windings for approximate
resistance value between:
White to red - 2.2 Ω
Brown to red - 196 Ω
Brown to white - 198.2 Ω


Test

#7 johntech

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Posted 11 August 2013 - 06:22 PM

Yes all other windings check ok

#8 johntech

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Posted 11 August 2013 - 06:39 PM

I get nothing at all on the primary windings

#9 RegUS_PatOff

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Posted 11 August 2013 - 07:02 PM

I get nothing at all on the primary windings

same with the "old" Transformer ?


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RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#10 johntech

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Posted 11 August 2013 - 09:20 PM

I never checked the original transformer I just saw no out put voltage. Now I have the original transformer back on and had to leave the job.

#11 RegUS_PatOff

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Posted 11 August 2013 - 09:41 PM

also do an OHM test of the output loads

A shorted load may cause the primary to burn out ..


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one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#12 johntech

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Posted 11 August 2013 - 09:57 PM

I'm kind of in a jam here the first transformer blew right in front of the customer after he had to wait several days for the parts to come in. I'm afraid if I put a new transformer on it will have the same results. Any suggestions would be greatly appreciated.

#13 RegUS_PatOff

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Posted 11 August 2013 - 10:22 PM

... the first transformer blew right in front of the customer

Did it blow up right after powering-up

OR did you do something... turn a Burner ON, etc ?


.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
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RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#14 johntech

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Posted 11 August 2013 - 10:48 PM

I'm kind of in a jam here the first transformer blew right in front of the customer after he had to wait several days for the parts to come in. I'm afraid if I put a new transformer on it will have the same results. Any suggestions would be greatly appreciated. When I plugged it in the center burner was in the on position and immediately started sparking. I turned it off and back on it sparked one more time and then nothing

#15 johntech

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Posted 11 August 2013 - 10:57 PM

I'm getting continuity on red and white .0002

#16 RegUS_PatOff

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Posted 11 August 2013 - 11:36 PM

I'm getting continuity on red and white .0002

is that with the Transformer disconnected ?

the Transformer Red and White should be about 2 OHMs

The "harness" should be higher than 60 OHMs

.That's the 12vAC that goes to the LED's built into the Harness


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one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#17 johntech

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Posted 12 August 2013 - 07:47 AM

Yes that's disconnected. Do you think there is a short in that light switch

#18 RegUS_PatOff

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Posted 12 August 2013 - 11:42 AM

... Do you think there is a short in that light switch

take a close inspection of the Harness and the LED Boards

or one of the "regular" Diodes may be shorted

or one of the wires of the Valve switch is shorted to chassis / ground
 
http://www.repaircli...R=154&N=1473713
Wire-Harness-WB18T10411-01583644.jpg
 
lwb0.jpg


.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw

#19 johntech

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Posted 12 August 2013 - 06:44 PM

If the boards visually check out ok then what are the chances of it being the led harness opposed to the spark harness? Both these parts are special order and won't ship for a few weeks I am going to go back out there and try to pinpoint the prob before I order. Anything else you recommend I check while I'm there

#20 RegUS_PatOff

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Posted 12 August 2013 - 06:52 PM

If it's the 12v line causing the problem,

the 12v line doesn't got to the Spark Module

 

Did you test the Diodes for shorts ?

And check for shorts to chassis / ground on the wires of the Gas Valve Switches ?

and inspect those small "chips" on the back of the LED Boards


.

one of my video productions: “Easter Seals: Walk With Me”

every day is Down Syndrome Awareness Day
"A Child Is Waiting" . Burt Lancaster . Judy Garland . 1962

RegUS_PatOff > www.youtube.com/watch?v=oPAY2LsKVEw




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