SERVICE MANUAL
LBB 3310/00, 3330/00 and 3331/00 page: 27 Date of issue:
4822 861 11006 July 1998
10.2.13 Functional test of system volume control (S260).
Measure the output level related to each position of the volume control (S260) for the loudspeakers of the Delegate and
Chairman units.
Figure 15
Input setting G1: M1 related to M2 (GND) is -36dBV (15.8mVrms) with a frequency of 1 kHz.
position of the
loudspeaker volume
control switch (S260)
measurement results for A1
Amplification at M3
position 10 -9.4dBV +/- 1dB
position 9 -11.4dBV +/- 1dB
position 8 -13.4dBV +/- 1dB
position 7 -15.4dBV +/- 1dB
position 6 -17.4dBV +/- 1dB
position 5 -19.4dBV +/- 1dB
position 4 -21.4dBV +/- 1dB
position 3 -23.4dBV +/- 1dB
position 2 -25.4dBV +/- 1dB
position 1 -27.4dBV +/- 1dB
position 0 < -70dBV (selective) or < -70 dBV (a-weighted)
Note: put the volume control switch (S260) to position 10 (maximum right position).
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