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I'm replacing the membrane switch on the microwave. I can see how to access and remove the control assembly. Are there any "tricks" to removing the existing membrane switch and replacing the new one?
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Originally Posted by: shorner  I'm replacing the membrane switch on the microwave. I can see how to access and remove the control assembly. Are there any "tricks" to removing the existing membrane switch and replacing the new one? Shorner, I'm not too clear as to which part you have or need,so I listed them both, and attached instructions from the service manual, as it pertains to the components you're working on. :) :) :) Part number: AP4216489
Touch Pad Assembly Part number: AP4238764
Control Panel(complete) Grille Removal
The top full-width grille is removable for service to some
components, such as: humidity sensor, oven light, door
removal, flame sensor, vent motor capacitor, fuse,
control panel, and stirrer motor (some models). Grille Removal
1. Disconnect power to oven.
2. Remove screws located in front on top of microwave securing grille. 3. Pull outward on the top portion of the grille releasing
the tabs. 4. Reassemble in reverse order. Control Panel Removal
The control panel is made up of several components,
such as a printed circuit board and touch panel.
1. Disconnect oven power and remove grille, see "Grille
Removal" procedure.
2. Remove screw located at the top of touch panel. Lift
control panel up and out to release bottom tab
connections.
3. Place control panel on a flat surface. P.C. Board Removal
1. Disconnect oven power and remove grille, see "Grille
Removal" procedure.
2. Remove control panel, see "Control Panel Removal"
procedure.
3. Discharge high voltage capacitor, see "High Voltage
Capacitor Removal" procedure.
4. Disconnect ribbon connector by sliding top part of
connector upward. Once in released position remove
ribbon from connector by siding ribbon side-to-side. NOTE:
Caution should be used when removing cable
from connector. Ribbon cable has two holes
which connector locks ribbon in place.
5. Disconnect and mark the wire connectors from
circuit board.
6. Remove screws securing circuit board to control
panel assembly.
7. Reassemble in reverse order.
NOTE: Do not flex circuit board.
4. Reassemble in reverse order. Control Key Panel Removal
The key panel has one ribbon connection on the circuit board. Control Key Panel Removal
1. Disconnect power to microwave oven.
2. Remove control panel, see "Control Panel Removal"
procedure.
3. Discharge high voltage capacitor, see "High Voltage
Capacitor Removal" procedure.
4. Disconnect ribbon connector by sliding top part of
connector upward. Once in released position remove
ribbon from connector by sliding ribbon side-to-side. NOTE: Caution should be used when removing cable
from connector. Ribbon cable has two holes
which connector locks ribbon in place.
5. Peel failed key pad off and replace with new key pad.
6. Reassemble in reverse order.
*** you only need to follow step 1 and 2 to discharge the capacitor,
Extremely high voltage, so be carefull. ***
High Voltage Capacitor Removal
1. Disconnect power to oven and remove control panel,
see "Control Panel Removal" procedure.
2. Discharge high voltage capacitor by connecting a
jumper wire to the terminal of high voltage capacitor
with the diode connected to it. Connect the other
end of the jumper wire to a well insulated screwdriver
and touch a nearby chassis ground screw.
3. Remove screws that secure capacitor and diode.
4. Slide capacitor mounting bracket out of the slots and
pull outward on capacitor, diode and bracket.
5. Reassemble in reverse order
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Originally Posted by: shorner Thank you Joe! You're quite welcome, It's a pleasure to help. Drop us a line and let us know how things went. Thanks, :) :) :)
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Can I replace the Memberane switch without pulling out the entire Conrol Panel?
Thanks..
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Originally Posted by: RonR Can I replace the Memberane switch without pulling out the entire Conrol Panel?
Thanks.. Ron, No, you'll have to remove the panel in order to insert the end of the ribbon into the ribbon connector on the control board. That's all located on the inside/backside of the control panel. :) :) :)
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Just to share...
Unplug the microwave, take the grill out (two screws, slid the panel left and pull out). One screw on the top of the Control Panel and one below. Slide the Control Panel up and pull out. Be careful for the ribbon cable. Pull the ribbon cable out and you now have the circuit board in your hand. You may have to unscrew the 3 screws on the circuit board to pull it out. Unpeel the Membrane from the face of the control panel. Stick the new one back on, screw back the board, plug in the ribbon cable (good idea to test the system now). Slide the control back in using two screws and put the grill back on the top. You're done.
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Originally Posted by: RonR Just to share...
Unplug the microwave, take the grill out (two screws, slid the panel left and pull out). One screw on the top of the Control Panel and one below. Slide the Control Panel up and pull out. Be careful for the ribbon cable. Pull the ribbon cable out and you now have the circuit board in your hand. You may have to unscrew the 3 screws on the circuit board to pull it out. Unpeel the Membrane from the face of the control panel. Stick the new one back on, screw back the board, plug in the ribbon cable (good idea to test the system now). Slide the control back in using two screws and put the grill back on the top. You're done. Ron, Thanks for the update, we're glad things went well. Good Luck, :D :D :D
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Hi Shorner- I'm sure you figured it out but to add to the string for others doing the same I might add that when we do this for customers here at https://www.iptechllc.com/membrane-switches we also pay great attention to cleaning the surface after the old adhesive membrane switch is removed. Depending on the materials, often the old adhesive can be left behind similar to removing a label or tape from something when it leaves some behind. Depending on the membrane switch construction, the slightest bumps or anomalies on the surface could cause a membrane to malfunction- Be terrible to ruin a new stitch placing it over some inclusions on the surface. Wiping with alcohol is good to do as well.
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Rank: Guest
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Joined: 8/10/2018(UTC) Posts: 0 Location: 99556 Was thanked: 4 time(s) in 4 post(s)
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Hi Shorner- I'm sure you figured it out but to add to the string for others doing the same I might add that when we do this for customers here at https://www.iptechllc.com/membrane-switches we also pay great attention to cleaning the surface after the old adhesive membrane switch is removed. Depending on the materials, often the old adhesive can be left behind similar to removing a label or tape from something when it leaves some behind. Depending on the membrane switch construction, the slightest bumps or anomalies on the surface could cause a membrane to malfunction- Be terrible to ruin a new stitch placing it over some inclusions on the surface. Wiping with alcohol is good to do as well.
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