Troubleshooting R&S SMB
1407.0806.82 3.36 E-6
Stereo/RDS Coder signal path check
P
erform the tests from top to bottom of the table.
F
ault
T
est
A
ction if test fails
Set the Stereo Coder to
State On
Audio Source Off
Pilot State On
Pilot Deviation 10 kHz
ARI State Off
RDS State Off
Check the signal at the multiplex input pin 13
of X108 of the Basis Board with an
oscilloscope. The signal must be a 19 kHz
sine wave with an amplitude of 80mVp to 200
mVp.
Most probably the Stereo Coder
module or the ribbon cable W108 is
defective. Check the Stereo Coder
being supplied correct (see
page 3.32).
Set the Stereo Coder to
State On
FM Deviation 40 kHz
Audio Source Ext L, R
Mode Stereo R=L
Preemphasis Off
Pilot State Off
ARI State Off
RDS State Off
Provide a 1 Vp, 10 kHz sinewave signal to the
external STEREO L and STEREO R
connectors using a tee junction. Check the
signal at the multiplex input pin 13 of X108 of
the Basis Board with an oscilloscope. The
signal must be a 10 kHz sine wave with an
amplitude of 300mVp to 800 mVp.
Change the setting to
Mode Stereo R!=L
Check the signal at the multiplex input pin 13
of X108 of the Basis Board with an
oscilloscope. The signal must be a 10 kHz
sine wave with an amplitude of 300mVp to
800 mVp.
If the cables to the rear panel are
connected correctly, most probably
the Stereo Coder module or the
ribbon cable W108 is defective.
Check the Stereo Coder being
supplied correct (see page 3.32).
Set the Stereo Coder to
State On
Mode Stereo R=L
Audio Source LF Gen
LF Gen Frequency 10 kHz
LF Gen Shape Sine
Check the signal at pin B3 of X103 on the
Basis Board with an oscilloscope. The signal
must be a 10 kHz sine wave with an amplitude
of 950mVp to 1050 mVp.
Most probably the RF Board or the
ribbon cable W222 is defective.
Check the RF Board being supplied
correct (see page 3.24).
Stereo mode
signal path
faulty
Set the Stereo Coder to
State On
Mode Stereo R=L
Audio Source LF Gen
LF Gen Frequency 10 kHz
LF Gen Shape Sine
Check the signal at pin 11 of X108 with an
oscilloscope. The signal must be a 10 kHz
Most probably the Basis Board is
defective. Check the Basis Board
being supplied correct (see page
3.21).
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