How to fix having no speech on a 4+N monitor

If you are not receiving speech on your 4+N monitor, please see below.

  • If the fault is isolated to one monitor, check connections 1,2 and 6 of that monitor.
  • If the fault is common to all monitors 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 monitor on a short cable directly to the speaker/mic as follows –

Monitor           Speaker/mic
6                     -
1                    1A
2                     2

When you lift the handset you should have speech between the test monitor and the entry panel. If you do the fault lies in the wiring of the system.

Lee is the author of this solution article.

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