My FINCH II Display shows dashed lines (-----)

The 5 dashed lines on your FINCH II display indicates that there is a communication failure between your TD Transmitter and your FINCH II.

Possible causes include:

• Wiring problems between the Transmitter and the FINCH II Display
• TD100 Transmitter failure - Need to repair or replace unit
• FINCH II Display failure - Need to repair or replace unit

Tools needed:

• Common hand tools
• Digital Multimeter (DMM)

Troubleshooting Steps: 

1.  Power on your TD System.  

2.  Open the FINCH II enclosure to access the circuit board on the door. 

A. Compartment 1 and 2 Wire Connections:

Check the wires on the COMP #1 & #2 terminals.

Replace or fix any issues with the wiring. All wires need to be secure and tight, not corroded or frayed, and in the correct order. The black wire is PWR, the white wire is GND, and the red wire is SV.

If the wires seem good on the FINCH display, the next step is to check the transmitter wires. 

Check the wires on the Transmitter.

Replace or fix any issues with the wiring. All wires need to be secure and tight, not corroded or frayed, and in the correct order. The black wire is PWR, the white wire is GND, and the red wire is SV.

If you have more than one compartment connected, and only one has dashed lines, swap the connectors for Comp #1 & #2 and see if the fault follows the wiring or stays on the original Compartment.

If it stays on the original compartment, the problem is with the FINCH circuit board. You will need to replace the unit.

If the fault follows the wiring that was moved, the problem is with the wiring harness or transmitter.

Proceed to the next section “Testing the cable harness”

Testing the Cable Harness between Transmitter and FINCH II

1. Visually inspect the cable from the transmitter to the display, where it can be accessed. Look for cuts, crushed areas and abrasions. Pay attention to pinch-points and where the cable is run over sharp metal edges. The cable may be temporarily repaired and then replaced at the earliest opportunity.
2. At the display: 
   1. Disconnect the three transmitter wires at the display. 
   2. Temporarily connect all three wires together using alligator clip jumpers or twist the wires together. 
3. At the transmitter:
   1. Disconnect the transmitter from the probe.
   2. Visually inspect each wire end and terminal for a poor connection. If the connection is in poor condition, repair it.
   3. Disconnect the three wires at the transmitter.
   4. Tug on each crimp terminal to see if it is loose. If the terminal is loose or falls off, repair it.
   5. Electrically test the wires using a DMM. See the instructions below for the test procedure.
4. The electrical test:
   1. The following tests check for cut wires.
      1. Test for continuity between the black and white wires. If they test short-circuit, the wires are OK. If the test is open-circuit, the black and/or white wires have been cut.
      2. Test for continuity between the black and red wires. If they test short-circuit, the test is OK. If the test is open-circuit, the black and/or red wires have been cut.
   2. If the tests above are OK, check for crushed wires that are shorted together.
      1. Disconnect the temporarily connected wires at the display and continue testing.
      2. Test continuity between the black and white wires. If they test short-circuit, the black and white wires have been damaged. If they test open-circuit, the wires are OK.
      3. Test continuity between the black and red wires. If they test short-circuit, the black and red wires have been damaged. If they test open-circuit, the wires are OK.
      4. Test continuity between the white and red wires. If they test short-circuit, the white and red wires have been damaged. If they test open-circuit, the wires are OK.

If you got this far in testing and the wires test OK, the problem may be with the Transmitter or an intermittent connection in the cable. Try swapping the potentially faulty Transmitter with a working Transmitter.