Blank Membrane Display

Symptom

The membrane meter display is not energized. The entire membrane is blank.

Fault

The fault could be a defective membrane switch assembly, a bad ribbon cable or connection, or a loss of power to the membrane.

Solution

1. Check to ensure power is available to the power supply and the breaker is turned on. (Item 3)
   
2. Check the ribbon cable connections at the back of the membrane, the terminal block connections, and the connection on the control board. (Item 19)
   
3. Verify the colored stripe on the ribbon cable is connected to pin 1 of the plug in connection.
   
4. Check the supply voltage to the membrane. With a DC voltmeter ensure +5 VDC is supplied to the membrane from the control board.(Item 2) Connect the positive lead to the junction of R10 and C56. Connect the common lead to ground at TB1 pin 6.
   1. If the +5 VDC is present, replace the membrane and/or the ribbon cable. (Item 1 and Item 19)
   2. If the +5 VDC is not present, check to verify 115 VAC is present at E1 and E2 on the control board. (Item 2)
      1. If good, replace the driver control board. (Item 6)
      2. If not present, check the control transformer (Item 9) and the supply voltage to the power supply.
         
5. Contact Enercon's Service Department for assistance.