MASTER LINK
Possible cause
The product is connected to mains and the stand-by LED is illuminated.
If this is OK, do the following:
- Measure data+ (pin 2) relative to ground.
- Measure data- (pin 1) relative to ground.
- When there is no transmission the reading should be b/- 200
and 300 mV.
- When data is being transmitted it should read 0V.
Reading using an oscilloscope.
Measure the following:
No transmission
———————————— + 0.25 V
———————————— 0 V
———————————— - 0.25 V
Transmission
If data- and data+ are not as indicated in "No transmission" and are unable
to transmit, there may be a fault in the main room BeoVision or BeoSound,
as one of these supplies the voltage.
Note that with setups using BeoLink Converter it is always the Master Link
driver that supplies the voltage. If there are two Master Link drivers in the
system, one will confi gure itself as supply master when connected.
The fault is found using the isolation method. If the fault is not in one of
the Master Link drivers, there is another unit pulling data either low or
high. There could also be a cable fault or connection fault. Data faults can
also be read off in service mode, see section on service mode.
If the data is OK, proceed to reading the supply voltage, which must be as
indicated under specifi cations. If the voltage is not OK, use the isolation
method until you fi nd the faulty equipment or faulty connection.
Fault
No sound and no operation
0.3V
0V
-0.3V
Data+
Data-
mS
No sound but operation OK
36
Data and supply voltage are OK. Measure the signal level for pin 13 to 16
in relation to the specifi cations. If the signal level is OK, there is a fault
with the link room product, possibly the converter box, cables or a
connection fault.
Playing is at half
volume
One of the balanced sound signals is missing.
Summary of Contents for BEOLINK VIDEO
Page 1: ...BEOLINK Master Link Handbook ...
Page 2: ......