Troubleshooting R&S SMB
1407.0806.82 3.32 E-6
Troubleshooting B Stereo/RDS Coder option R&S SMB-B5
Input and Output Signals
The Stereo/RDS Coder module is connected to the Basis Board via connector X108 and the ribbon cable
W108. The cable supports the Stereo Coder power supply, the digital control lines, and the connections
for internal audio input and multiplex output signal. The internal analog modulation signal generated by
the RF Board and an associated GND signal passes through the ribbon cable W222 to the Basis Board.
On the Basis Board a summing amplifier extracts the differential portion of the signals and delivers the
result to the Stereo Coder.
In addition, the Coder is connected to three external audio input BNC connectors on the rear panel via
shielded SMP cables.
Stereo Coder module
input / output
Voltage/
Signal
Cable
Connection to Basis Board
connector X108
Power supply, digital
control, internal analog
input / output
W108
Stereo L Left analog audio input W401, BNC to SMP, shielded
Stereo R Right analog audio input W402, BNC to SMP, shielded
Stereo S/P DIF S/P DIF digital audio input W403, BNC to SMP, shielded
MPX
Stereo multiplex signal, not
connected
-
Check the voltages for the Stereo Coder being according to the following table.
Pin at X108
Pin at other
end of W108
Test Point
(Basis Board)
Fuse
(Basis Board)
Voltage
31 4 +12V_ANA F3 +12.4 V … +14.2 V
29 6 -12V_ANA F6 -14.2 V … -12.4 V
27 8 +5V F7 +4.7 V … +5.3 V
25 10 +3V3 F7 +3.1 V … +3.5 V
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