Analogue Audio Fault Finding

Below you will find Basic Fault Finding solutions to Audio entry systems

No Call
  • Check there is a link between –6 and ~0 terminals of 786/13 power supply.
  • Check connection from PS terminal (call tone output) of 786/13 power supply to common side of call buttons. (For multi entrance systems contact Technical Support).
  • To test the operation of the power supply, connect a handset directly to the power supply as follows
Handset / Power supply 
      6                    -6
      1                     PS
When you push the cradle switch down on the handset, the handset should ring. If it does the fault lies in the wiring of the system.

No Speech
  • If the fault is isolated to one handset, check connections 1,2 and 6 of that handset.
  • If the fault is common to all handsets measure the voltage between the – and + terminals on the speaker/mic unit in the entry panel. The voltage should be 6V DC. Check that the polarity is correct.
  • To test the operation of the speaker/mic unit proceed as follows – Remove the wires in terminals 1A and 2 of the speaker/mic (leaving the wires in + and – connected). Connect a handset on a short cable directly to the speaker/mic as follows -
Handset Speaker/mic
        6               -
        1              1A             
        2               2
When you lift the handset you should have speech between the test phone and the entry panel. If you do the fault lies in the wiring of the system.

No Lock Release
  • The lock release output from the 786/13 power supply is 12V AC @ 2.4A. There is a relay inside the power supply (SE1, SE2 & SE3) that can be used to control a lock release. If you are using a DC release, a separate DC power supply will be required.
  • Measure between the ~0 and ~12 terminals of the power supply. The voltage should be at least 12V AC. • The jumper on the 786/13 power supply must be in one position or the other. If it is removed altogether the lock release circuit will not work.
  • Remove the two connections from the lock release; connect your meter to the two wires. When the lock button on the handset is pressed your meter should read 12V AC.To test the lock release circuit of the power supply, first remove any wires that are in the AP terminal. Use a short link of wire to touch the ~0/-6 connection to the AP terminal. When you do this you should hear the relay inside the power supply clicking. Use a meter to test the SE1, SE2 & SE3 relay output connections.

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