TOP PANEL OPEN SENSOR
1. The pulse (T=84msec, Duty 50%) is always added to LED
(QU15), from #30Pin of QU10, through RF28 and QU22.
2. Cover the sensor with your fingers, the collector voltage
of QU01 goes up over 0.7VP-P. and through RU71 and
QU09, the pulse of 5VP-P inputs to #29Pin of QU10. Then
the top panel will open.
3. Not needing to cover the sensor with your fingers, QU01
receives the light of LED reflected by lens oneself.
Therefore, the collector of QU01 adds the reverse pulse
through RF29, QU26 and RF32, for reduced incorrect
working. So, the voltage of residual pulse for the collector
of QU01 is suppressed to 0.1VP-P.
REMARK
When the sensor receives sunlight or a strong light as
incandescent, top panel might open.
POPS NOISE KILLER
RX72, CX70 and QX70 are the circuit to delay power supply
for approx. 2 seconds. Therefore, this circuit prevents pops
noise generation when power switch is on or off.
SUB WOOFER
Sub woofer output is composed a low pass filter of cut-off
frequency 150Hz octave 12dB. It is output 2V for AUX L,R
input 60Hz, 200mV (volume is maximum).
REMARK
Sub woofer output level is depended on volume control.
2-8
Fig.2
POWER
ON/OFF
CD MODE STOP OR
TRACK JUMP
MUTE BUTTON
ON
MODE
CHANGE
VOLUME
MINIMUM
MUTE YES YES YES YES YES
MUTE2 YES YES NO YES NO
DSC MUTE NO YES NO NO NO
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