MASTER LINK
TROUBLESHOOTING GUIDE
Master Link products,
e.g. BeoLab 3500
When carrying out troubleshooting on a Master Link installation, the first
thing to do is to apply the method of exclusion. First disconnect the main
room and the link room, one at a time, to ascertain whether the fault is in
the main room or in the link room. Then disconnect the individual
products, one at a time, until the faulty product or the faulty connection
has been found.
Simple measurements on the Master Link can be made by means of a
voltmeter or an oscilloscope. All listed specifications are measured to
ground.
The following specifications apply to Master Link:
Pin no. in Cable colour Function Specification
the Master
Link socket
1 white/green data - -0.25 V ± 0.1 V
2 green data+ +0.25 V ± 0.1 V
3 white/blue ML-sense
4 - 10 no connection (N.C.)
11 blue - supply voltage -7 V to -15V
in standby -3V to -15V
12 pink +supply voltage +7 V to +15 V
in standby +3V to +15V
13 white/orange audio -L 1 V Bal
Rin 2.2 Mohm,
Rout 75 ohm
14 orange audio +L 1 V Bal
Rin 2.2 Mohm,
Rout 75 ohm
15 white/red audio -R 1 V Bal
Rin 2.2 Mohm,
Rout 75 ohm
16 red audio +R 1 V Bal
Rin 2.2 Mohm,
Rout 75 ohm
Screen Ground 3 x solid wire
The data speed is 19,200 bits/sec.
By way of comparison, the data speed for the Master Control Link is
160 bits/sec.
32
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