SERVICE MANUAL
LBB 3310/00, 3330/00 and 3331/00
page: 17
Date of issue:
4822 861 11006
July 1998
Nominal level, maximum level and bandwidth
Connect successively a sine-wave generator to the left and right external microphone input connections, (“MIC-IN+”
(M131) and “MIC-IN-” (M132) ) related to GND (M133) according to figure 5.
NOTE: be sure that the gain control potentiometer (R140) of the external microphone input is set to the middle
position.
6
2
9
5
4
8
2
7
25
Ω
X205 M119
X150
X110
X10
AC
24V DC
Power Supply
90 ... 264V AC
~
~
Loudspeaker
PCB CPSU
M110 M111
M121
M122 M124
M150 M151
M2
(GND)
(GND)
(GND)
X130
R140
X130
Ext. mic
Input
Ext. mic
Input
G1
G1
M133
M133
M131
M132
1
1
GND
GND
2
3
mic-IN+
mic-IN-
+
-
A1
V
003_005.cdr
L
R
IN
Rec-IN
Line-IN
Rec-IN
Telephone
Sine-Wave
Generator
Sine-Wave
Generator
+
+
-
-
6
9
X110
M110 M111
M1
(GND)
R
Line-IN
Figure 5
settings for G1
measurement results for A1
Amplitude
Frequency
Amplification
Nominal level
-56 dBV (1.6 mVrms)
1 kHz
-15 dBV +/- 2dB (85dB SPL)
Maximum level
-31 dBV (28.2 mVrms)
1 kHz
+10 dBV +/- 2 dB (110 dB SPL)
Bandwidth
-56 dBV (1.6 mVrms)
125 Hz
-3dB +/- 2dB related to nom. level at
1kHz
Bandwidth
-56 dBV (1.6 mVrms)
12.5 kHz
-1dB +/- 1dB related to nom. level at
1kHz.
Mute level: set S240 to chairman
only mode
-56dBV (1.6 mVrms)
1 kHz
< -74 dBV (selective) or < -74 dBV (A-
weighted)
Set S240 back to position AUTO 1.
Содержание CCS 800
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