Sharp HTDP-2500-W Service manual
SERVICE MANUAL
Manufactured under license from Dolby Laboratories Licensing Corporation.
DOLBY, the double-D symbol and "PRO LOGIC" are
trademarks of Dolby Laboratories Licensing Corporation.
HT-DP2500W
No. S0884HTDP2500
HT-DP2500W
HT-DP2500W home theater system consisting of
HT-DP2500W home theater system, CP-F2500W,
CP-SW2500W, CP-C2500W and CP-SR2500W.
• In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
CONTENTS
Page
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ...................................................................................................... 1
VOLTAGE SELECTION.......................................................................................................................................................... 2
SPECIFICATIONS ................................................................................................................................................................. 2
NAMES OF PARTS ............................................................................................................................................................... 3
OPERATION MANUAL.......................................................................................................................................................... 4
DISASSEMBLY...................................................................................................................................................................... 6
ADJUSTMENT ...................................................................................................................................................................... 8
NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................... 9
BLOCK DIAGRAM ............................................................................................................................................................... 10
SCHEMATIC DIAGRAM/WIRING SIDE OF P.W.BOARD................................................................................................... 12
TYPES OF TRANSISTOR AND LED.................................................................................................................................... 19
FUNCTION TABLE OF IC.................................................................................................................................................... 24
FL SEGMENT ...................................................................................................................................................................... 28
PARTS GUIDE/EXPLODED VIEW
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
QACCE0008AW00
OPLGA0250AFZZ
QACCL0005AW00
SHARP CORPORATION
– 1 –
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
SERVICE MANUAL
Manufactured under license from Dolby Laboratories Licensing Corporation.
DOLBY, the double-D symbol and "PRO LOGIC" are
trademarks of Dolby Laboratories Licensing Corporation.
HT-DP2500W
No. S0884HTDP2500
HT-DP2500W
HT-DP2500W home theater system consisting of
HT-DP2500W home theater system, CP-F2500W,
CP-SW2500W, CP-C2500W and CP-SR2500W.
• In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
CONTENTS
Page
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ...................................................................................................... 1
VOLTAGE SELECTION.......................................................................................................................................................... 2
SPECIFICATIONS ................................................................................................................................................................. 2
NAMES OF PARTS ............................................................................................................................................................... 3
OPERATION MANUAL.......................................................................................................................................................... 4
DISASSEMBLY...................................................................................................................................................................... 6
ADJUSTMENT ...................................................................................................................................................................... 8
NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................... 9
BLOCK DIAGRAM ............................................................................................................................................................... 10
SCHEMATIC DIAGRAM/WIRING SIDE OF P.W.BOARD................................................................................................... 12
TYPES OF TRANSISTOR AND LED.................................................................................................................................... 19
FUNCTION TABLE OF IC.................................................................................................................................................... 24
FL SEGMENT ...................................................................................................................................................................... 28
PARTS GUIDE/EXPLODED VIEW
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
QACCE0008AW00
OPLGA0250AFZZ
QACCL0005AW00
SHARP CORPORATION
– 1 –
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
HT-DP2500W
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
VOLTAGE SELECTION
The voltage selector is located on the AC voltage selector box. If adjustment is necessary, use a screwdriver in order to turn the
selector in either direction until the correct voltage figure is displayed in the window next to the adjustment screw.
SPECIFICATIONS
HT-DP2500W
● General
Type: Home theater system
Power source: AC 110/127/220/230 - 240 V,
50/60 Hz
Power consumption: 105 W
Dimensions: Width; 430 mm (16-15/16")
Height; 116 mm (4-5/8")
Depth; 322 mm (12-11/16")
Weight: 7.3 kg (16.1 lbs.)
Output power:
(For Australia/
New Zealand)
Output power:
(Except for Australia/
New Zealand)
Output terminals: Front speakers; 8 ohms
Input terminals: VCR-1, VCR-2, AUX (Audio sig-
(Front)
RMS; 50 W (25 W + 25 W)
(10% T.H.D.)
(Centre)
RMS; 25 W (10% T.H.D.)
(Surround)
RMS; 25 W (total) (10% T.H.D.)
(Sub woofer)
RMS; 25 W (10% T.H.D.)
PMPO; 1,000 W
(Front)
RMS; 50 W (25 W + 25 W)
(10% T.H.D.)
(Centre)
RMS; 25 W (10% T.H.D.)
(Surround)
RMS; 25 W (total) (10% T.H.D.)
(Sub woofer)
RMS; 25 W (10% T.H.D.)
Centre speaker; 8 ohms
Surround speakers; 16 ohms
Sub woofer; 8 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
nal); 500 mV/47 kohms
CP-F2500W
● Front speaker section
Type: 2-way, 10 cm (4") woofer, and 5
cm (2") tweeter
Maximum input
power: 50 W
Rated input power: 25 W
Impedance: 8 ohms
Dimensions: Width; 150 mm (5-15/16")
Height; 200 mm (7-7/8")
Depth; 125 mm (4-15/16")
Weight: 1.5 kg (3.3 lbs.)/each
CP-C2500W
● Centre speaker section
Type: 10 cm (4") full-range speaker
Maximum input
power: 50 W
Rated input power: 25 W
Impedance: 8 ohms
Dimensions: Width; 200 mm (7-7/8")
Height; 150 mm (5-15/16")
Depth; 125 mm (4-15/16")
Weight: 1.3 kg (2.9 lbs.)
CP-SR2500W
● Surround speaker section
Type: 10 cm (4") full-range speaker
Maximum input
power: 25 W
Rated input power: 12.5 W
Impedance: 16 ohms
Dimensions: Width; 150 mm (5-15/16")
Height; 170 mm (6-3/4")
Depth; 105 mm (4-3/16")
Weight: 1.0 kg (2.2 lbs.)/each
● Tuner section
Frequency range: FM; 88-108 MHz
AM; 531-1,602 kHz
CP-SW2500W
● Sub woofer section
Type: 13 cm (5-1/8") woofer
Maximum input
power: 50 W
Rated input power: 25 W
Impedance: 8 ohms
Dimensions: Width; 210 mm (8-5/16")
Height; 310 mm (12-1/4")
Depth; 310 mm (12-3/16")
Weight: 4.2 kg (9.3 lbs.)
Specifications for this model are subject to change without
prior notice.
– 2 –
HT-DP2500W
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
VOLTAGE SELECTION
The voltage selector is located on the AC voltage selector box. If adjustment is necessary, use a screwdriver in order to turn the
selector in either direction until the correct voltage figure is displayed in the window next to the adjustment screw.
SPECIFICATIONS
HT-DP2500W
● General
Type: Home theater system
Power source: AC 110/127/220/230 - 240 V,
50/60 Hz
Power consumption: 105 W
Dimensions: Width; 430 mm (16-15/16")
Height; 116 mm (4-5/8")
Depth; 322 mm (12-11/16")
Weight: 7.3 kg (16.1 lbs.)
Output power:
(For Australia/
New Zealand)
Output power:
(Except for Australia/
New Zealand)
Output terminals: Front speakers; 8 ohms
Input terminals: VCR-1, VCR-2, AUX (Audio sig-
(Front)
RMS; 50 W (25 W + 25 W)
(10% T.H.D.)
(Centre)
RMS; 25 W (10% T.H.D.)
(Surround)
RMS; 25 W (total) (10% T.H.D.)
(Sub woofer)
RMS; 25 W (10% T.H.D.)
PMPO; 1,000 W
(Front)
RMS; 50 W (25 W + 25 W)
(10% T.H.D.)
(Centre)
RMS; 25 W (10% T.H.D.)
(Surround)
RMS; 25 W (total) (10% T.H.D.)
(Sub woofer)
RMS; 25 W (10% T.H.D.)
Centre speaker; 8 ohms
Surround speakers; 16 ohms
Sub woofer; 8 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
nal); 500 mV/47 kohms
CP-F2500W
● Front speaker section
Type: 2-way, 10 cm (4") woofer, and 5
cm (2") tweeter
Maximum input
power: 50 W
Rated input power: 25 W
Impedance: 8 ohms
Dimensions: Width; 150 mm (5-15/16")
Height; 200 mm (7-7/8")
Depth; 125 mm (4-15/16")
Weight: 1.5 kg (3.3 lbs.)/each
CP-C2500W
● Centre speaker section
Type: 10 cm (4") full-range speaker
Maximum input
power: 50 W
Rated input power: 25 W
Impedance: 8 ohms
Dimensions: Width; 200 mm (7-7/8")
Height; 150 mm (5-15/16")
Depth; 125 mm (4-15/16")
Weight: 1.3 kg (2.9 lbs.)
CP-SR2500W
● Surround speaker section
Type: 10 cm (4") full-range speaker
Maximum input
power: 25 W
Rated input power: 12.5 W
Impedance: 16 ohms
Dimensions: Width; 150 mm (5-15/16")
Height; 170 mm (6-3/4")
Depth; 105 mm (4-3/16")
Weight: 1.0 kg (2.2 lbs.)/each
● Tuner section
Frequency range: FM; 88-108 MHz
AM; 531-1,602 kHz
CP-SW2500W
● Sub woofer section
Type: 13 cm (5-1/8") woofer
Maximum input
power: 50 W
Rated input power: 25 W
Impedance: 8 ohms
Dimensions: Width; 210 mm (8-5/16")
Height; 310 mm (12-1/4")
Depth; 310 mm (12-3/16")
Weight: 4.2 kg (9.3 lbs.)
Specifications for this model are subject to change without
prior notice.
– 2 –
HT-DP2500W
■ Front panel
1. Left Front Speaker Indicator
2. Centre Speaker Indicator
3. Right Front Speaker Indicator
4. Dolby Pro Logic Indicator
5. Extra Bass Indicator
6. Sleep Indicator
7. Timer Play Indicator
8. (TUNER) FM Stereo Indicator
9. (TUNER) Memory Indicator
10. (TUNER) FM Stereo Mode Indicator
11. Left Surround Speaker Indicator
12. Surround Signal Indicator
13. Sub Woofer Indicator
14. Right Surround Speaker Indicator
15. On/Stand-by Button
16. Remote Control Sensor
17. Stand-by Indicator
18. Timer Indicator
19. Dolby Pro Logic Button
20. Equalizer Selector Button
21. Extra Bass Button
22. Volume Control
23. Headphone Socket
24. Function Selector Buttons
25. (TUNER) Tuning Up/Down Buttons
26. Memory Button
27. Timer/Sleep Selector Button
28. Jog Dial
29. Enter Button
30. Sub Woofer Volume Control
NAMES OF PARTS
1
11
1213 14
15
23 24
23 4 56
161718
25
19
26 27 28
HT-DP2500W
8
9
10
7
20 21 22
29
30
■ Rear panel
1. AM Aerial Terminal
2. Aerial Earth Terminal
3. FM 75 Ohms Aerial Terminal
4. VCR-1 Output Sockets
5. VCR-1 Input Sockets
6. VCR-2 Input Sockets
7. AUX Input Sockets
8. Surround Speaker Sockets
9. Front/Centre/Sub Woofer Sockets
10. AC Voltage Selector
11. AC Power Lead
■ Remote control
1. Remote Control Transmiter LED
2. On/Stand-by Button
3. Function Selector Buttons
4. Preset Balance Button
5. Dolby Pro Logic Button
6. Test Tone Button
7. Tuner Call Button
8. Mute Button
9. Balance Selector Buttons
10. Equalizer Selector Button
11. Extra Bass Button
12. Centre Level Buttons
13. Surround Level Buttons
14. (TUNER) Preset Up/Down Buttons
15. Volume Control Buttons
1
2
3
4
5
67
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
– 3 –
HT-DP2500W
CP-F2500W
Front Speaker
1. Tweeter
2. Woofer
3. Speaker Cord
CP-SR2500W
Surround Speaker
1. Woofer
2. Speaker Cord
CP-C2500W
Center Speaker
1. Woofer
2. Speaker Cord
1
1
2
2
3
CP-SW2500W
Sub woofer
1. Woofer
2. Bass Reflex Duct
3. Speaker Cord
1
2
PREPARATION FOR USE
0.2 m - 6 m
(8" - 20')
15˚
15˚
1
2
OPERATION MANUAL
■
Remote control
Notes concerning use:
● Replace the batteries if the operating distance is reduced
or if the operation becomes erratic.
● Periodically clean the transmitter LED on the remote control and the sensor on the main unit with a soft cloth.
● Exposing the sensor on the main unit to strong light may
interfere with operation. Change the lighting or the direction of the unit.
● Keep the remote control away from moisture, excessive
heat, shock, and vibrations.
3
– 4 –
HT-DP2500W
CP-F2500W
Front Speaker
1. Tweeter
2. Woofer
3. Speaker Cord
CP-SR2500W
Surround Speaker
1. Woofer
2. Speaker Cord
CP-C2500W
Center Speaker
1. Woofer
2. Speaker Cord
1
1
2
2
3
CP-SW2500W
Sub woofer
1. Woofer
2. Bass Reflex Duct
3. Speaker Cord
1
2
PREPARATION FOR USE
0.2 m - 6 m
(8" - 20')
15˚
15˚
1
2
OPERATION MANUAL
■
Remote control
Notes concerning use:
● Replace the batteries if the operating distance is reduced
or if the operation becomes erratic.
● Periodically clean the transmitter LED on the remote control and the sensor on the main unit with a soft cloth.
● Exposing the sensor on the main unit to strong light may
interfere with operation. Change the lighting or the direction of the unit.
● Keep the remote control away from moisture, excessive
heat, shock, and vibrations.
3
– 4 –
(Continued)
■
AM/FM Interval (span)
The International Telecommunication Union (ITU) has established that member countries should maintain either a 10
kHz or a 9 kHz interval between broadcasting frequencies
of any AM station. The illustration shows the 9 kHz interval
zones (regions 1 and 3), and the 10 kHz interval zone (region
2).
This product is not equipped with a span selector. However,
it will be adjusted to 9 kHz AM interval (50 kHz FM interval)
when shipped from the factory.
Before using the unit, be sure to set it for the AM tuning
interval (span) used in your area.
To check the tuning span currently selected:
1
Set the ON/STAND-BY button on the main unit to ON.
2
Press the TUNER (BAND) button until "FM" or "AM" appears in the display.
3
Press the TUNER (BAND) button to select the AM band.
● If "AM 531 kHz" is displayed, it means that the radio has
been adjusted for a 9 kHz span. If "AM 530 kHz" is displayed, it means that the radio has been adjusted for a
10 kHz span.
To change from a 9 kHz AM (50 kHz FM) interval to a
10 kHz AM (100 kHz FM) interval:
1
Press the ON/STAND-BY button on the remote control
to enter the stand-by mode.
2
Hold down the TUNER (BAND) button and the ENTER
button for at least 4 seconds. Release the buttons when
"AM SP 10 kHz" and "FM SP 100 kHz" are displayed
alternately.
To return to a 9 kHz AM (50 kHz FM) interval:
1
Press the ON/STAND-BY button on the remote control
to enter the stand-by mode.
2
Hold down the TUNER (BAND) button and the ENTER
button for at least 4 seconds. Release the buttons when
"AM SP 9 kHz" and "FM SP 50 kHz" are displayed alternately.
Caution:
● When the unit is left for a few hours after the span has
been switched and AC power lead disconnected, it will
be automatically returned to a 9 kHz span. If this happens, set the span again.
● When the span is switched, any stations that are
memorised will be cancelled.
ON/STAND-BY
TUNER (BAND)
ENTER
ON/
STAND-BY
[9 kHz → 10 kHz]
(4 seconds)
[10 kHz → 9 kHz]
(4 seconds)
HT-DP2500W
– 5 –
HT-DP2500W
DISASSEMBLY
Caution on Disassembly
Follow the below-mentioned notes when disassembling
the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
2. Take off nylon bands or wire holders where they need be
removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were
before disassembling.
3. Take suff cient care on static electricity of integrated
circuits and other circuits when servicing.
HT-DP2500W
(A1)x2
ø3x10mm
Top Cabinet
Front Panel
HT-DP2500W
REMOVAL PROCEDURESTEP FIGURE
1 Top Cabinet 1. Screw ................. (A1) x5 6-1
2 Rear Panel 1. Screw ............... (B1) x11 6-1
3
Front Panel
4 Main PWB/ 1. Screw .................(D1) x7 6-2
Tuner PWB 2. Socket ................(D2) x3
5 Power Supply PWB 1. Screw ................. (E1) x5 6-2
(With Voltage Selector
Switch PWB)
6 Display PWB 1. Knob ................... (F1) x1 6-3
7 Switch PWB 1. Screw ................ (G1) x2 6-3
8
Headphones PWB
1. Screw .................(C1) x5 6-2
2. Flat Cable ...........(C2) x1
3. Socket ................(C3) x3
2. Socket ................ (E2) x3
2. Nut ...................... (F2) x1
3. Screw ............... (F3) x10
4. Socket ................ (F4) x1
5. Knob ................... (F5) x1
1. Screw ................ (H1) x1 6-3
CP-F2500W
STEP
1 Speaker 1. Net ........................(A1) x1 7-1
REMOVAL
PROCEDURE
2. Screw ....................(A2) x6
CP-SW2500W
STEP
1 Speaker 1. Net ........................(A1) x1 7-2
REMOVAL PROCEDURE
2. Screw ....................(A2) x4
FIGURE
FIGURE
(A1)x1
ø3x10mm
Voltage Selector
Switch PWB
(D1)x3
ø3x8mm
Tuner
PWB
Main
PWB
(E1)x5
ø3x8mm
Display PWB
Rear
Panel
(C1)x1
ø3x8mm
(D2)x2
Front Panel
Figure 6-1
(D1)x4
(C3)x1
ø3x8mm
(E2)x1
Power Supply
PWB
Figure 6-2
(F5)x1
(B1)x11
ø3x10mm
(C2)x1
(A1)x2
ø3x10mm
Front Panel
Power Amp. PWB
Headphones
(E2)x2
(C3)x1
PWB
(D2)x1
(C3)x1
(C1)x3
ø3x8mm
(C1)x1
ø3x8mm
CP-C2500W
STEP REMOVAL PROCEDURE
1 Speaker 1. Net ........................(A1) x1 7-3
2. Screw ....................(A2) x4
CP-SR2500W
STEP
1 Speaker 1. Net ........................(A1) x1 7-4
REMOVAL
PROCEDURE FIGURE
2. Screw ....................(A2) x4
FIGURE
– 6 –
(F3)x10
ø3x10mm
(H1)x1
ø3x10mm
(F1)x1
(F2)x1
(F4)x1
Switch PWB
(G1)x2
ø3x10mm
HeadphonesPWB
PWB Washer
Figure 6-3
HT-DP2500W
Screw
Driver
(A1)x1
(A2)x4
ø4x13mm
Speaker Box
Woofer
Top Side
CP-F2500W
(A1)x1
Top Side
Tweeter
(A2)x2
ø4x13mm
(A2)x4
ø4x13mm
Screw
Driver
Figure 7-1
CP-C2500W
Woofer
Speaker Box
Figure 7-3
CP-SW2500W
(A2)x4
ø4x13mm
(A1)x1
Woofer
Top Side
Speaker Box
CP-SR2500W
(A1)x1
Top Side
(A2)x4
ø4x13mm
Woofer
Speaker Box
Screw
Driver
Figure 7-2
Screw
Driver
Figure 7-4
– 7 –
HT-DP2500W
ADJUSTMENT
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Test Stage
Band — 87.50 kHz (fL): L202 *1
Coverage 3.4 ± 0.1 V
RF 98 MHz 98.00 MHz L201 *2
Frequency
(10 - 30 dB)
Frequency
Display
*1. Input: Antenna, Output: TP302
*2. Input: Anetnna, Output: Speaker Terminal
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage
IF 450 kHz 1,602 kHz T204 *1
Band — 531 kHz (fL): T203 *2
Tracking 990 kHz 990 kHz T201 *1
Frequency
Frequency
Display
*1. Input: Antenna, Output: TP301
*2. Input: Input is not connected, Output: TP302
Setting/
Adjusting
Parts
Setting/
Adjusting
Parts
(AM Band
Coverage
0.8V±0.1v
Instrument
Connection
Instrument
Connection
• FM Detection
Signal generator: 10.7 MHz, FM sweep
Test Stage
IF 10.7 MHz 98.00 MHz T202 Input: Pin 1
Frequency
Frequency
Display
Setting/
Adjusting
Parts
(Turn the of IC201
core of T202 Output:
fully counter- Pin 1of
clockwise) IC203
Instrument
Connection
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Adjusting
98.0 MHz 98.00 MHz VR201 *1 Input: SOC201
(25 dBµV) Output: Speaker
Frequency
Display
Parts
Instrument
Connection
Terminal
*1. Adjust so that an output signal appears.
• Setting the Test Mode
Keeping the ENTER button and MEMORY button pressed,
turn on POWER (of Main Set). Then, the frequency is initially
set in the memory as shown in Table. Call it with the JOG to
use it for adjustment and check of tuner circuit.
Preset No.
1 87.50 MHz 6 531 kHz
2 108.00 MHz 7 1,602 kHz
3 98.00 MHz 8 990 kHz
4 90.00 MHz 9 603 kHz
5 106.00 MHz 10 1,404 kHz
11~40
FM Preset No.
AM
SOC201
ANTENNA
TERMINAL
AM TRACKING
T201
R216
TP302
FM RF
1
FM IF
T202
L201
IC201
TUNER PWB
T203
VR201
24
1
AM IF
T204
AM BAND
COVERAGE
FM MUTE
LEVEL
L202
FM BAND
COVERAGE
Figure 8 ADJUSTMENT POINTS
IC203
TP301
R223
13
12
– 8 –
HT-DP2500W
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
10 minutes
A
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
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.
Hand L frequency characteristics are lowered.
B C D
SP output
level
VOL (Volume) is lowered.
When quiet music is played back.
When VOL is lowered.
NOTES ON SCHEMATIC DIAGRAM
• 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 electrolytic capacitor, the expression “capacitance/withstand voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
SW1 ON STAND-BY ON—OFF
SW2 TIMER/SLEEP ON—OFF
SW3 DOLBY PRO LOGIC ON—OFF
SW4 EQUALIZER ON—OFF
SW5 X-BASS ON—OFF
SW6 ENTER ON—OFF
SW7 VOLUME DOWN ON—OFF
SW8 VOLUME UP ON—OFF
SW9 MEMORY/SET ON—OFF
• 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 “ ” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
POSITIONREF. NO DESCRIPTIONREF. NO DESCRIPTION POSITION
SW10 TUNING UP ON—OFF
SW11 TUNING DOWN ON—OFF
SW12 TUNER(BAND) ON—OFF
SW13 CD/AUX ON—OFF
SW14 VCR-2 ON—OFF
SW15 VCR-1 ON—OFF
SW23 JOG DIAL ON—OFF
SW601 VOLTAGE SELECTOR 110V
– 9 –
HT-DP2500W
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
10 minutes
A
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
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.
Hand L frequency characteristics are lowered.
B C D
SP output
level
VOL (Volume) is lowered.
When quiet music is played back.
When VOL is lowered.
NOTES ON SCHEMATIC DIAGRAM
• 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 electrolytic capacitor, the expression “capacitance/withstand voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
SW1 ON STAND-BY ON—OFF
SW2 TIMER/SLEEP ON—OFF
SW3 DOLBY PRO LOGIC ON—OFF
SW4 EQUALIZER ON—OFF
SW5 X-BASS ON—OFF
SW6 ENTER ON—OFF
SW7 VOLUME DOWN ON—OFF
SW8 VOLUME UP ON—OFF
SW9 MEMORY/SET ON—OFF
• 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 “ ” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
POSITIONREF. NO DESCRIPTIONREF. NO DESCRIPTION POSITION
SW10 TUNING UP ON—OFF
SW11 TUNING DOWN ON—OFF
SW12 TUNER(BAND) ON—OFF
SW13 CD/AUX ON—OFF
SW14 VCR-2 ON—OFF
SW15 VCR-1 ON—OFF
SW23 JOG DIAL ON—OFF
SW601 VOLTAGE SELECTOR 110V
– 9 –
HT-DP2500W
A
1
FM
GND
AM
SOC201
ANTENNA
TERMINAL
BAND PASS
FILTER
1 2 3
BF201
IC201
1
FM FRONT END
TA7358AP
2
6
5
3
4
L201
FM RF
T202
FM IF
AM RF
AM ANTENNA
T201
7
VT
OSC
FM OSC
T203
8
FM IF
L202
AM OSC.
9
FM IF
AMP
Q201
IF AMP
Q281
FM MUTE LEVEL
FMOSC
VT
A+12V
FM +B
Q203
VR201
FM
FM IF
CF201
AM IF
FM IF IN
1
AM MIX
FM IF
IN
AM
AM
OSC
OSC
24
23
OUT
X202
4.5MHz
20
1
X IN X OUT
A OUT
OSC
7
BO 1
PLL CONTROLLER
+B3
CF202
AM IF
6
SD
4
FM IF
5
GND
10
IF OUT
AM IF
CF203
T204
2
3
REQ
OUT
IC203 LA1833
FM IF DET./FM MPX./AM IF
22
21
AFC
7
STEREO
AM RF IN
IN
STEREO
VOLTAGE
REGURATER
A+12V
+B3
IF IN
IO1
FM IN
AM IN
22
16
11
15
IC202
LC72131
3
12
VSS
21
4
6
5
DICLCE
DO
8 9
FM
DET
VDD
+B3
VCC
11
PHASE
+5V
17
BO4
FM
+B3
10
9
17 18
FM
OUT
12
AM/FM
MPX
VCO
CUT
OUT
L CH
L-CH
19 16
AM
MPX
IN
R CH
14 13
R-CH
15
MUTING
Q202
TUNER
MUTE
VPP
P15
P11
P14
P13
P10
P12
7 6 5 4
11 10
9
8
73 74
75
P13
76
P11
P10
P12
P14
77
78
P15
79
P16
80
NC
81
NC
82
NC
83
NC
84
DAPD
85
ADPD
86
AC3-RES
87
AC3-SS
AC3-SI
88
89
D-SEL
AC3-SCK
90
SW-ON
91
PRO-EN
92
PRO-DI
93
PRO-CK
94
V-SW1
95
V-SW2
96
V-MUTE
97
NC
98
NC
99
TUN-DO
TUN-DI
TUN-CK
100
1 2 3
F1
NC(NP)
F1
P16
NC(NP)
1
3
2
VP
(AC)
SD
Q5
JK401
AUDIO
INPUT/OUTPUT
TERMINALS
VCR1
IN
VCR1
OUT
VCR2
IN
AUX
IN
L-CH
R-CH
L-CH
R-CH
L-CH
R-CH
L-CH
R-CH
MUTE
MUTING
Q411
Q412
IC411
NJM4565D
VCR1 OUTPUT AMP.
IC411
AMP
L-CH
2
R-CH
6
4
8
A–12V A+12V
A+12V
L-CH
3
5
R-CH
VCR1
VCR2
TUNER
AUX
L-CH
R
L-CH
R
L-CH
R-CH
L-CH
R-CH
34
CLK
38
35
DATA
37
ENABLE
36
18
VCC
8
VREF
7
21
GND
X451
8MHz
DICECL
232425
55
L1
57
R1
L2
54
58
R2
L4
52
R4
60
L3
53
R3
59
FRONT
IN
48
64
RT IN
LT IN
L-IN
IC452
LV1035M
DOLBY
PRO LOGIC
DECORDER
OSC
31
32
A+12V
56
VDD
IC501 LC75396N
AUDIO PROCESSOR
GRAPHIC EQUALIZER
VSS
LF1C1
R-IN
RF1C1
47
1
26
R
L
C-OUT
C-OUT
9
24
L-OUT
23
R-OUT
22
S-OUT
S-IN
16
10 11
46 45
LT-IN
R-OUT
S-OUT
LSELO
RSELO
6349
L-CHOUT
R-IN
RT-IN
L-OUT
14
12
R-CHOUT
L-IN
15
44
4
LF2C1
RF1C2
LF1C2
46
2
R
L
X-BASS
L-MIX OUT
R-MIX OUT
S-OUT
HEAVY
SOFT
34
43 42
5
LF2C2
RF2C1
RF2C2
LFOUT
CENTER
REAR IN
RF1C3
LF1C3
RRIN LRIN
30
1845
3
R
L
S-IN
C-IN
LF2C3
VOLUME
VOLUME
HEADPHONE AMP.
H-MUTE
33
16
LFIN
L-CH
31
LFOUT
RFCOM
17
R-CH
RFOUT
REAR
OUT
RROUT
20
28
LROUT
CENTER
OUT
IC581
NJM4558D
A+12V
IN
8
L-CH
3
5
R-CH
A–12V
IC561
NJM4558D
BUFFER
REAR
IN
5
3
CENTER
4
8
4
Q531
Q532
A–12V
1
IN
6
4
A–12V
IC431
NJM4558D
LOW PASS FILTER
AMP.
OUT
L-CH
1
7
R-CH
J581
HEADPHONES
A+12V
REAR
OUT
7
1
CENTER
SUB WOOFER
2
OUT
J581
Figure 10 BLOCK DIAGRAM (1/2)
– 10 –
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