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Can I test a Control Panel?

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I have a Jenn-Air Range top. Only certain functions (buttons) on the Control Panel touch pad work. Can I test

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  #1 (permalink)  
Old 11-06-2013, 10:27 AM
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Default Can I test a Control Panel?
Model Number: JGS8750ADS   Brand: Jenn-Air   Age: 5 - 10 years   

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I have a Jenn-Air Range top.
Only certain functions (buttons) on the Control Panel touch pad work.
Can I test the Panel to see if it indeed needs to be replaced? Can it be a separate issue? Or can I pretty much assume that it needs replacement?
(Keys 7, 8, 9) do not work on touch pad. But all the rest do!

Thank you for your reply!


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  #2 (permalink)  
Old 11-07-2013, 12:16 AM
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Here are your parts
Parts for Jenn-Air JGS8750ADS Range - AppliancePartsPros.com

See the attachment for the tech sheet.

The problem could be either the control panel or the control board/timer.
The tech sheet does have the control panel pin-outs so you can check it.
Note that track 4 in the ribbon cable is common to all 3 keys that do not work.

You may want to try the following
Connector Cleaning / Checking
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector. Use electronics contact cleaner or isopropyl alcohol.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Would not hurt to clean the connector on the board. Use electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.
Attached Images
File Type: pdf JGS8750.pdf (526.9 KB, 7 views)
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Old 11-18-2013, 11:49 AM
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Thank you for your response denman
I did as you suggested and cleaned the contacts, but unfortunately the 7,8,9 keys still do not operate.
Unfortunately at this point I don't know if its the control board, the ribbon cable or the keypad. Any suggestions?
Thank you
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Old 11-18-2013, 12:05 PM
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If you do not own a meter, I would suggest you purchase a one. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.
4. When you start always short the meter leads together. This will tell you that the meter is working and if there is any 0 offset.

There is a good STICKY at the start of this forum about it's use.
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