Saturday, September 10, 2011

How to access the fuse panel on a GE spacesaver XL 1800 microwave

EXPERT PLEASE HELP ME:---
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OK CUSTOMER:---
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CUSTOMER:---
MY oven is dead, i am locating fuse on the board oven.

Expert:---
Yes i will guide you sir:--
I will give you one direct link..In that part number 74 is fuse The fuse is part 74 and the holder is part 73, You may have acces to the cabinet from removing the scews at the back. The whole cabinet would sometimes be lifted whole and all the electrical parts would be exposed.

Also please test first where you are plugging the unit if it has power. That could also be a problem of a dead set.

Click this link and see the parts 73 and 74:---
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CUSTOMER :--Ok expert i saw the fuse in diagram.
yes its part 73 the holder and part 74 the fuse:--
I order this fuse:-- its a $7 part.
AppliancePartsPros.com | GE Fuse, part number: AP2631556

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BUT IN our unit the fuse location is bit different, i replaced the fuse and its still not working:---
This diagram matches the model number of our unit, but differs substantially in detail around the fuses: On our unit, both fuses are located top right, on a vertical panel about 6" behind the front control panel. Easy access once the cover is off.

To remove the cover and access the fuses (and other electrical parts), do as follows:
1. Remove the exhaust fan unit top center rear: remove three screws and reach inside to carefully unplug the power cord, squeezing to release the plastic catches on each side of the plug.
2. The cover you wish to remove is a single piece of bent metal covering the sides and top of the unit. Unscrew all screws passing through this cover; this will be a total of 18 screws located on top, bottom, sides, and rear. Do not unscrew the two screws on the back panel that do not pass through the cover.
3. Slide the whole cover backwards about 3/4" and lift it clear.

Both fuses test OK (continuity check across fuse holder.)

Yes, we have wall power, and the line from the power plug to the internal main fuse checks OK; the problem is somewhere in the unit beyond the main fuse.

Other possibilities? What about the gas sensor (flame sensor, p/n 51)? Any way to test that with just a multimeter?


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EXPERT:---
if the fuse chaging is not helping, then its gas sensor problem.
ITS part 51 in the diagram and its $75 part:--
This is gas sensor
AppliancePartsPros.com | GE Sensor - Gas, part number: AP2026395

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EXPERT -----
I was thingking if only the gas sensor is the problem , you should have at least digital read outs. Since there is non, you can check the low voltage transformer.
Asmall transformer form the power supply board which sometimes have a very fine wire which could just snap open. trace the voltage from the the cable to the fuse and to the transformer.

It is not the high voltage trasformer. Please do not be confused. It is the low voltage one. Just to have a low voltage to work on the electronics.

By the time you are tracing the voltage, you could also check all the wiring connections if there is no corrosion specially on the pc board.

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Customer Reply:---

Thanks for the info about the gas sensor -- very useful.

The low voltage transformer is a component of the Smartboard p/n 14, right? No visible problems there.

I did notice something possibly relevant with the two thermostats:
thermostat p/n 79, located next to the small fan reads as an open circuit.

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EXPERT:---
Yes this is thermostat $19 part:-- Its part number 79 in the diagram, which i gave.
AppliancePartsPros.com | GE Thermostat, part number: AP2026102

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CUSTOMER :---
I think i traced the problem, but want your advise on this info.----

I did notice something possibly relevant with the two thermostats:
thermostat p/n 79, AP2026102 , located next to the small fan, reads as an open circuit.
thermostat p/n 85,AP2026352, located next to the HV transformer, reads as a closed circuit, zero resistance.
Is that as it should be?


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EXPERT:---
if the thermostat is open circuit, that means it is defective. It should be closed as the other one that you tested.

BUT AS PER YOUR PROBLEM I THINK ITS PROBLEM WITH TRANSFORMER ON SMART BOARD>---
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CUSTOMER :---WHERE IS SMART BOARD in the diagram

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EXPERT:---
IN THE diagram its part number 14.see smart board fig:---

AppliancePartsPros.com | GE Smartboard, part number: AP3203000

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CUSTOMER :--- is this smart board faulty.

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EXPERT:---
I think a tiny transformer on this smart board is faulty:----

Customer, :---
Which transformer and where it is:---

EXPERT :---
The smart board, when I looked at it, I can't seems to find a small transformer, I just can't figure out the rectangular thing on the right side if it is a transformer

Have you seen what is inside part 9999? There could be schematics there.

Kindly check control panel part 120. There could be a small low voltage transformer in the pc board .

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Customer Reply:--- OH i got more details:----


Here are questions based on your most recent reply:
>>The smart board, when I looked at it, I can't seems to find a small transformer, I just >>can't figure out the rectangular thing on the right side if it is a transformer.

The transformer is on the back of the smartboard, top left in the back-view photo.

>>Anyway, if the thermostat is open circuit, that means it is defective. It should be >>closed as the other one that you tested.

The open circuit is thermostat p/n 79, AP2026102 , located next to the small fan.

thermostat question 1: Could a defective open circuit thermostat produce our totally dead system? (Yes, I wish we had the schematic.)

thermostat question 2: Suppose I put in a wire to short across the terminals of the open circuit thermostat. Would that be a safe test to see if replacing the thermostat would solve our problem?


>>Have you seen what is inside part 9999? There could be schematics there.

p/n 9999 appears to be an envelope. No envelope inside our unit; no schematics in the documemntation that came with the unit. No schematics that we could locate on line.

>> Kindly check control panel part 120. There could be a small low voltage transformer in the pc board .

I haven't done the disassembly to pull out the control panel.


THIS IS THE DETAIL which solved my problem :---

OK, we appear to have a fix:

I put a jumper across the open circuit thermostat p/n 79, AP2026102 , located next to the small fan. Control panel came on and works, lights and fan work, 5 second test of heating works.

I've ordered a replacement part ($15).


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EXPERT :--- so thermostat was faulty.

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CUSTOMER :---

YES IT WAS. We replaced it and all is well.

THIS IS THE SITE FROM WHERE I ORDERED THIS PART:---
It cost me $16 and its part number 79 on diagram.

THERE was one more thermostat , part number 85, but that was ok.---------

Thank god my friend was a basic tech knowledgeable and his knowledge helped us to follow your direction. And our problem solved.----------