Touch Sensor Technology (Tst) Control System; Troubleshooting The Tst Panel - Electrolux EW30GF65G Series Product & Training Manual

TOUCH SENSOR TECHNOLOGy (TST) CONTROL SySTEM

The TST system utilizes a touch sensitive glass panel (photo A) to allow the user to control all oven
and warmer drawer operations. The TST panel is connected to the electronic oven control (EOC)
and the electronic surface element control (ESEC) system UIB (user interface board) via ribbon
connectors. It is similar in function to a membrane switch.
The TST control panel generates an electromagnetic field around each touch pad. When this field is
interrupted by touching the glass, the control panel communicates the selection information to the
EOC. The EOC then responds by signaling the oven relay board to close the appropriate relays to
perform the selected operation or function.
NOTE: The TST system touch glass is a non serviceable part and must be replaced as a complete
assembly if found to be defective. The replacement glass panel will come attached to the frame and
will include ribbon connectors. (Photo B)
Frame
Touch Glass
Photo A
Photo B

Troubleshooting The TST Panel

The TST control panel has ribbon connectors that link it to the EOC. (Photo C).
If these connectors fail or become loose the TST control panel will not operate and under some
conditions will generate a fault code in the EOC display window.
If the TST control malfunctions or fails to operate inspect and re-seat the ribbon connectors. If a
failure/fault code is present follow the diagnostic procedure for that code.
If no fault code appears but the EOC does not
EOC
respond when the TST panel is touched then
the cause is either a defective EOC or TST
panel. Replace the EOC first. If the problem
remains replace the TST panel assembly.
If only a single key is non responsive then the
TST panel is the most likely cause of failure.
Photo C
Ribbon Connectors
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