An external door station eg Fermax, DP03X, DS01 connected to DM02 Door station Interface module has high distortion on the external door station speaker but is clear on the inside keypad or telephone
This may be caused by the incorrect setting of the J5 shunt on the DM02. J5 should be shunted only if connected to a DP03X (not DP03) in order to turn on the DP03 red LED when the inttercom is in use. The DP03x will NOT operate well if J5 is not shunted. For all other door stations (Fermax or DS01) leave the shunt off.
The DM02 manual already states that J5 should be shunted only for DP03X but the consequences have been spelt out more clearly in the revised manual 1.0.8 at http://www.cytech.biz/Downloads/Files/169/DM02man.pdf
Last edited on Friday Oct 10th, 2008 08:19 am by slychiu
The purpose of the shunt is to cater for different products like Fermax, DP03X, DS01 etc so it is not always required to be removed.
The important thing for installers to do is to check what the correct settings should be for the installation, especially when there is a problem with distortion