R&S SMB Troubleshooting
1407.0806.82 3.37 E-6
sine wave with an amplitude of 900mVp to
1000 mVp.
Set the Stereo Coder to
State On
FM Deviation 40 kHz
Audio Source LF Gen
Mode Stereo R=L
LF Gen Frequency 10 kHz
LF Gen Shape Sine
Preemphasis Off
Pilot State Off
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 10 kHz
sine wave with an amplitude of 300mVp to
800 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
Audio Source Off
Pilot State On
Pilot Deviation 10 kHz
ARI State Off
RDS State Off
Check the signal at pin A1 of X103 on the
Basis Board with an oscilloscope (it is ok to
test at the via indicated in Fig 3-7). The signal
must be a 19 kHz sine wave with an amplitude
of 50mVp to 150 mVp.
Most probably the Basis Board is
defective. Check the Basis Board
being supplied correct (see page
3.21).
Fig. 3-10 Pin location X103 on Basis Board.
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