SERVICE MANUAL
LBB 3310/00, 3330/00 and 3331/00 page: 15 Date of issue:
4822 861 11006 July 1998
Nominal level and bandwidth
Insert a sine wave signal to the AUDIO-CONTR via M1 related to M2 and measure the output signal between M59 and
M57.
629548 27
25Ω
X205
M59
X150X110
X11
X10
AC
24V DC
Power Supply
G1
90 ... 264V AC
~~
Loudspeaker
PCB CPSU
M110
M2
SHIELD
M1
M111 M121 M122 M124 M150 M151
M57
(GND) (GND) (GND)
+
-
A1
V
Sine-Wave
Generator
GND
Audio Contr.
Trunk
003_003.cdr
LR IN
Rec-INLine-IN Rec-IN Telephone
+
-
Figure 3
settings for G1 measurement results for A1
Amplitude Frequency sound level
Nominal level -36 dBV (15.8 mVrms) 1 kHz -7.8 dBV +/- 1.5dB (72 dB SPL)
Bandwidth -36 dBV (15.8 mVrms) 125 Hz -8 dBV +/- 2 dB related to nom level at 1 kHz.
Bandwidth -36 dBV (15.8 mVrms) 12.5 kHz -3dB +/- 1.0dB related to nom. level at 1kHz.
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