BGM mode - volume attenuation
PRINCESS – Edition: 17.02.2005
48
FIELD SERVICE M
A
NUAL
11.7
BGM mode - volume attenuation
In the BGM (
B
ack
G
round
M
usic) mode the vo-
lume will be reduced by a certain factor.
This function is controlled by the signal „BGM“
pin 1 plug brown from the SCC unit. The active
BGM mode is displayed with a yellow LED near
plug P4. In this mode the volume of the normal
sound is adjustable by two BGM trim pots in the
center of the pre-amplifier board.
11.8
Automatic volume control (AVC) and clipping stage
The AVC sets CDs with different volume levels
to an equal level. The level of CDs with a high
level will be reduced, the level of low leveled
CDs will be increased. This control works rather
slow to save the dynamic range of the track.
The pre amp gain pots are situated between the
volume pre-set switches and the BGM level trim
pots. These two pots are factory pre set should
not
be adjusted.
11.9
Overdrive protection
In case of an overdriven power amp one or both
red clipping LEDs will light. The clipping circuit
will have an effect on the AVC circuit and the
volume will be reduced. Occasional lightning of
the clipping LEDs during a loud performance is
normal. Continuously lightning of one or both
LEDs indicates an overdriven channel and dis-
tortion can be heard. It is recommended to re-
duce the volume.
Also speakers with an impedance lower than 4
Ω
(in STEREO mode) may cause an overload and
the LEDs will light.
Low Level
BGM
Mic.-Kit
L
R
Line Out
L
R
Input Tape
L
R
Input CD
Amplifier F91
0039155
BGM Level
R
L
L
R
Clipping
P10
Remote
P10
Remote
P4
1
2
4
1
2
4
Tone
off
on
Treble
Bass
1
2
4
8
16
32
1
2
4
8
16
32
Volume
off
on
R
L
Mode
Input
CD
Stereo
Tape
2-Kanal
R
L
BGM LED
(yellow)
BGM trim pots
Low Level
BGM
Mic.-Kit
L
R
Line Out
L
R
Input Tape
L
R
Input CD
Amplifier F91
0039155
BGM Level
R
L
L
R
Clipping
P10
Remote
P10
Remote
P4
1
2
4
1
2
4
Tone
off
on
Treble
Bass
1
2
4
8
16
32
1
2
4
8
16
32
Volume
off
on
R
L
Mode
Input
CD
Stereo
Tape
2-Kanal
R
L
gain pots
Low Level
BGM
Mic.-Kit
L
R
Line Out
L
R
Input Tape
L
R
Input CD
Amplifier F91
0039155
BGM Level
R
L
L
R
Clipping
P10
Remote
P10
Remote
P4
1
2
4
1
2
4
Tone
off
on
Treble
Bass
1
2
4
8
16
32
1
2
4
8
16
32
Volume
off
on
R
L
Mode
Input
CD
Stereo
Tape
2-Kanal
R
L
clipping LEDs
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