APEM Illuminated Membrane Keypad - 1 x 4

Each key on the APEM 4 Key Illuminated Membrane Keypad has a mechanical life of 1,000,000 cycles.

Yes, the keypad comes with legend sheets that can be marked or printed on, allowing for full customization of symbols and orientation.

The keypad can operate reliably in temperatures ranging from -30°C to +55°C.

It connects via a ribbon cable with a female 2.54mm pitch 10-way connector, designed for interfacing with microprocessor ports.

The keypad is not specified as waterproof. It should be protected from moisture and should only be cleaned with a slightly damp cloth.

The maximum switching current for this keypad is 100mA.

The nominal voltage for the illumination is 30V.

Verify the ribbon cable connection is secure and correctly oriented. Check that the voltage supply is within the nominal 30V range. Ensure the microprocessor port is configured correctly to read the keypad matrix.

Check the power supply to the LED illumination. Ensure the connection for the illumination circuit is correctly made on the interface board. Verify the LED itself is not damaged.

Ensure the surface the keypad is mounted on is perfectly flat and rigid. Check for any debris under the membrane. The mechanical contacts may require cleaning if exposed to contaminants, though typically they are sealed.

Double-check the wiring of the ribbon cable against the matrix configuration. Ensure custom legends are correctly placed and do not interfere with key actuation. Verify the microprocessor's input reading logic.