How to resolve no communication on FINCH II Display (Shows -----)

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 problem between TD100 Transmitter and the FINCH II Display
• Corrupt TD80 Strapping Chart that is used to upgrade to a TD100 transmitter
• TD100 Transmitter failure - Need to repair or replace unit
• FINCH II Display failure - Need to repair or replace unit

Tools needed:

• Voltmeter Trouble Light Screwdriver
• Ohmmeter. ohm
• digital multimeter

Troubleshooting Steps: 

Below are the steps to take to try and address this issue. 

1.  Turn on the system power. 

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

A. Check your wire connections 

There is an SV1 Link and SV2 Link LED light above the COMP#1 and COMP#2 sections on the circuit board. 

Is the LED light blinking or not lit? 

A.	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.
B.	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 same order as the COMP #1 and # 2 terminals.
C.	If they are correct and tight, then proceed to “Testing the cable harness”.

Is the LED light turned on?

• Unplug the connector that is second from the left which has the TD100 attached and see if SV1 Link LED goes out.
• If the LED light turns off, then the problem is either the cable or TD Transmitter.
• If the LED stays on, while the TD100 is disconnected, the display is defective.

If only one of your compartments shows the dash line, try swapping the connectors between a compartment that is connected and one that isn't.

If you have more than one compartment connected, and only one has dash 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 and 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

Connect the TD100 to the display using a short piece of cable.

• 2Lo or SPILL: the TD100/80 is good, and the fault lies in the cable.
• 5 bars: the TD100/80 is defective.

If you suspect the wire harness, check for continuity of the wires in the cable using a digital multimeter set to ohm.

Be sure to disconnect wiring from both transmitter and display before taking measurements.

Measure resistance between the wires to check for shorted wiring.

Joining wires at one end or using a long test lead to loop back the signal will allow for taking continuity measurements with Ohmmeter.

If cable fails any of these tests, then the cable needs to be replaced with a new harness.