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mrden  
#1 Posted : Monday, January 11, 2010 5:39:27 PM(UTC)
mrden

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the 1,2,3,4,5,6 dont work but 7,8,9 work and the rest of the touch screen works
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denman  
#2 Posted : Tuesday, January 12, 2010 1:49:35 AM(UTC)
denman

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Here are your parts
Replacement parts for JENN-AIR JGS8750BDS Range - S/c S/i Gas | AppliancePartsPros.com

Here is the tech sheet with keypad pinout info
http://www.servicematters.com/maytag_library/docs/16026924.pdf

And finally a manual
http://www.servicematters.com/maytag_library/docs/16026923.pdf

the 1,2,3,4,5,6 dont work [COLOR="Blue"]Uses Pin 2 as common[/COLOR]
but 7,8,9 work [COLOR="Blue"]Uses Pin 3 as common[/COLOR] and the rest of the touch screen works

Try the following cleaning procedure.
Also check the keypad with a meter. This type of problem is usually the keypad but can be the control board, only way to tell for sure is with a meter.

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.
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.

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.

There is a good STICKY at the start of this forum about it's use.
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mrden  
#3 Posted : Wednesday, January 13, 2010 10:45:27 AM(UTC)
mrden

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how do i know which is the # 1 and the # 7 to short out which side do i count from?i Assume i touch the tips of the contacts with my meter and get continunity? thanks
denman  
#4 Posted : Wednesday, January 13, 2010 12:20:32 PM(UTC)
denman

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[COLOR="Blue"]how do i know which is the # 1 and the # 7 to short out which side do i count from?[/COLOR]
Take a look at the tech sheet it shows track #1 location.
Once you find one switch pin-out it will confirm your counting.

[COLOR="Blue"]
i Assume i touch the tips of the contacts with my meter and get continunity? [/COLOR]
Yes open normally and continuity when the key is pressed.
So do 7,8 and 9 first as you know they work.

Also note that pin 2 is common to all the keys that do not work so carefully inspect this track and this location on the boards connector.
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