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Overload protection
PRINCESS – Edition: 17.02.2005
49
FIELD SERVICE MANUAL
11.10
Overload protection
The power amplifier is provided with an overload pro-
tection circuit.
While the CD is playing two green LEDs indicate that
the speaker output relays are activated. If one of these
LEDs is dark during play and no sound appears an
overload of the power amp stage has occurred, which
is for example caused by a short circuit in the connec-
tion wires to the external speakers.
An additional internal watch dog circuit checks that the
audio signal contains no DC Voltages and no high
sublow frequencies. It also indicates that the load limi-
tation cut off has been reached. If only one test is not
successful the relays will be switched off.
11.11
Tape input
Additional to the CD input a
tape input with a higher input
sensivity is provided. As an op-
tion this input stage may be wi-
red as a correcting network to
work with a magnetic pick up
(RIAA). Set the ‘input’ DIP
switch to tape position to select
the tape input.
relay check
LEDs (green)
speakers relay
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
off
on
R
L
Mode
Input
CD
Stereo
Tape
2-Kanal
R
L
tape
input
input
switch
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