| Posted: Wednesday Nov 14th, 2007 11:50 am |
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Warby
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HI
We are using a Fermax doorphone with a DPM. Everything works fine except for the audio, nothing can be heard either way. The D8 LED comes on when i press 0 for doorstatioin. It is not working on the phones or the Keypad.
The DPM ID is 1 (SW all shunted) and there are no other DP's. We are using a third party transformer for the Fermax unit and all cabling is in order.
The system is Comfort II .
Any Ideas?
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| Posted: Wednesday Nov 14th, 2007 12:48 pm |
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admin
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Perhaps the mic and speaker wiring to the Fermax side is reversed?
Or the Mic and Spk pair which are supposed to be connected to Comfort are connected to Fermax and vice versa?
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| Posted: Wednesday Nov 14th, 2007 12:51 pm |
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Warby
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I have tried reversing all the Mic Voice cables, DPM to comfort then Fermax to DPM.
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| Posted: Wednesday Nov 14th, 2007 01:05 pm |
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admin
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Which Fermax model are you using, is it the Cityline?
Some intercoms, not Fermax as far as we know require the "handset" to be offhook in order for the audio to go through This requires a relay to connect to the intercom side to give the offhook connection. This is why I asked for the model
Do you have access to a multimeter or better still an oscilloscope?
Are you able to see if there is AC Voltage at the SPK out to Fermax terminal block when the door station should be talking? If you can see AC volateg here then the problem is related to the Fermax connections
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| Posted: Wednesday Nov 14th, 2007 01:50 pm |
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Warby
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We used a tone source genarator and wand to narrow it down to the Fermax unit.
We tried reversing the polarity of the DC input which has solved it.
Thanks for the quick responses!!
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