Notes On Schematic Diagram - Sharp HT-DP2500W Service Manual

EXPLANATION OF AUTOMATIC SOUND VALUE CORRECTION CONTROL
1. Outline
The recent trend is toward rise of CD record level in the world, for example rock, dancing music, etc. In case of continuous high
level playback G-EQ (graphic equalizer) and VOL (Volume) are controlled (lowered) automatically after a lapse of specific time
(10 minutes) so as to get the easy-to-listen sound level.
2. Explanation of operation
The CD playback operation is explained below.
Distortion clip point
X
0w
X : Threshold value of control circuit operation
A : Hight energy (hatched area) exceeding X is detecated, and the control mode is set.
B : After a lapse of 10 minutes the control is started.
B ~ C :
Data is fetched every 4
seconds to control.
C ~ D :
Control mode cancel conditions
• Resistor:
To differentiate the units of resistors, such symbol as K and
M are used: the symbol K means 1000 ohm and the symbol
M means 1000 kohm and the resistor without any symbol is
ohm-type resistor. Besides, the one with "Fusible" is a fuse
type.
• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means micro-micro-farad and the unit of the
capacitor without such a symbol is microfarad. As to electro-
lytic capacitor, the expression "capacitance/withstand volt-
age" is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
REF. NO DESCRIPTION
SW1 ON STAND-BY
SW2 TIMER/SLEEP
SW3 DOLBY PRO LOGIC
SW4 EQUALIZER
SW5 X-BASS
SW6 ENTER
SW7 VOLUME DOWN
SW8 VOLUME UP
SW9 MEMORY/SET
All manuals and user guides at all-guides.com
10 minutes
A
Initial frequency
characteristics.
If hight energy exceeding X is detected, VOL is lowered to get sound easy to listen.
Stable control
Continued control
The output data is fetched every 4 seconds to control. When quiet music is played back, the
control is performed so as to restore the initial frequency characteristics and initial VOL values.
When output exceeding X is not given
continuously for 10 minutes.
When the power is turned off or on.

NOTES ON SCHEMATIC DIAGRAM

POSITION
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
B
Hand L frequency char-
acteristics are lowered.
• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
• The indicated voltage in each section is the one measured by
Digital Multimeter between such a section and the chassis
with no signal given.
1. In the tuner section,
( ) indicates AM
< > indicates FM stereo
2. In the main section, VCR1.
3. In the power section, VCR1.
• Parts marked with "
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
REF. NO DESCRIPTION
SW10 TUNING UP
SW11 TUNING DOWN
SW12 TUNER(BAND)
SW13 CD/AUX
SW14 VCR-2
SW15 VCR-1
SW23 JOG DIAL
SW601 VOLTAGE SELECTOR
– 9 –
HT-DP2500W
SP output
level
C D
VOL (Volume) is lowered.
When quiet music is played back.
When VOL is lowered.
" ( ) are important for
POSITION
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
ON—OFF
110V