HT-SB250 (serv.man2) - Sharp Audio Service Manual (repair manual)

ht-sb250 (serv.man2) service manual
Model
HT-SB250 (serv.man2)
Pages
54
Size
5.82 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / Home Theatre
File
ht-sb250-sm2.pdf
Date

Read Sharp HT-SB250 (serv.man2) Service Manual online

HT-SB250
 
SERVICE MANUAL
No. S1102HTSB250H
PRECAUTIONS FOR USING LEAD-FREE SOLDER
CHAPTER 1. GENERAL DESCRIPTION
[1]  Important Service Notes (for U.K.only) ......... 1-1
[2] Specifications.................................................1-1
[3]  Name Of Parts ...............................................1-2
CHAPTER 2. ADJUSTMENTS
[1] Test 
Mode ......................................................2-1
CHAPTER 3. MECHANISM BLOCKS
[1] Disassembly ..................................................3-1
CHAPTER 4. DIAGRAM
[1] Block 
Diagram ...............................................4-1
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Voltage...........................................................5-1
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1]  Notes On Schematic Diagram........................ 6-1
[2]  Types Of Transistor And LED ........................ 6-1
[3] Schematic 
Diagram ........................................ 6-2
[4]  Chart Of Connecting Wires .......................... 6-12
[5]  Wiring Side Of PWB..................................... 6-14
CHAPTER 7. OTHERS
[1]  Function Table Of IC ...................................... 7-1
PARTS GUIDE
SOUND BAR SYSTEM
HT-SB250
(
W
)
MODEL
CONTENTS
is a trademark of SRS Labs, Inc.
WOW HD technology is incorporated under license from SRS Labs, Inc.
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified
be used.
SOUND BAR SYSTEM
HT-SB250
(
BK
)
MODEL
W : White Colour
BK : Black Colour
SHARP CORPORATION
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.
!
HT-SB250
 – i –
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
Example:
Indicates lead-free solder of tin, silver and copper.
Lead-free wire solder for servicing
Ref No.
Description
Parts No.
"MAIN, POWER, AMPLIFIER, SWITCH PWB" of this model employs lead-free solder. The LF symbol indicates 
lead-free solder, and is attached on the PWB and service manuals. The alphabetical character following LF 
shows the type  of lead-free solder.
2. Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional 
lead wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40°C, we recommend 
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering 
bit, contact our service station or service branch in your area.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220°C which is higher than the conventional lead 
solder by 40°C,and as it has poor solder wet ability, you may be apt to keep the soldering bit in contact with the 
PWB for extended period of time. However, since the land may be peeled of for the maximum heat-resistance 
temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady 
soldering condition. 
Lead-free solder contains more tin, and the end of the soldering bit may be easily corrected. Make sure to turn 
on and off the power of the bit as required. If a different type of solder stays on the tip of the soldering bit, it is 
alloyed with lead-free solder. Clean the bit after every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sand paper.
Be careful when replacing parts with polarity indication on the PWB silk.
PWB-A 92LPWB8091MANS 
MAIN (A1) / POWER (A2) / AMPLIFIER (A3) / SWITCH (A4)
HT-SB250
 –2
CHAPTER 1GENERAL DESCRIPTION
[2]
 Specifications
CAUTION : “Danger of explosion if battery is incorrectly replaced. Replace only with the same or
equivalent type”.
General
(*) This power consumption value is  obtained when in the
power stand-by mode.
Power source
DC IN 12V 
 4A: AC/DC adaptor
(AC 100 - 240 V ~ 50/60 Hz)
Power
consumption
Power on: 10 W
Power stand-by: 0.4 W (*)
Output power
Front speaker:
RMS: 12 W (6 W + 6 W) (10% T.H.D.)
RMS: 9.6 W (4.8 W + 4.8 W) (0.9% T.H.D.)
Subwoofer:
RMS: 20 W (10% T.H.D.)
RMS: 13 W (0.9% T.H.D.)
Speaker
2.1-way Speaker System
Front speakers: 40 mm (1-1/2") Full Range 
Impedance: 12 ohms / Channel
Subwoofer: 57 mm (2-1/4") Woofer (x4)
Impedance: 3 ohms 
(12 ohms x 4 parallel connections)
Input terminals
Analogue input (LINE 1): 
RCA type x 1pair (L/R) 
500 mV / 47 kohms
Analogue input (LINE 2): 
Stereo mini socket Ø 3.5 mm
100 mV / 47 kohms
Dimensions
Width: 851 mm (33-1/2")
Height: 96 mm (3-3/4")
Depth: 70 mm (2-3/4")
Weight
1.90 kg (4.19 lbs.)
[1] Important Service Notes (for U.K. only)
Before returning the unit to the customer after completion of a repair or adjustment it is necessary for the following withstand voltage test to be
applied to ensure the unit is safe for the customer to use.
Setting of Withstanding Voltage Tester and set.
Set name
set value
Withstanding Voltage Tester
Test voltage
4,240 VPEAK
3,000 VRMS
Set time
6 secs
Set current (Cutoff current)
4 mA
Unit
Judgment
OK: The “GOOD” lamp lights.
NG: The “NG” lamp lights and the buzzer sounds.
PROBE
AC
OUT
AC/DC
ADAPTOR
SHORT-CIRCUIT
AC POWER
SUPPLY CORD
CONNECT THE PROBE
TO SHELL OF DC CONNECTOR
WITHSTANDING
VOLTAGE TESTER
1 – 1
HT-SB250
 – 2
[3] Names Of Parts
Front panel
 1. Standard Indicator
  2. Cinema/Game Indicator
  3. Information Display
 4. Sport Indicator
 5. News Indicator
 6. On/Stand-by Button
  7. Volume Down Button
  8. Volume Up Button
 9. Surround Button
10. Function Button
11. Remote Sensor
12. Left Front Speaker
13. Bass Reflex Duct
14. Subwoofers
15. Right Front Speaker
Rear Panel
  1. Audio Line In 2 Socket
  2. Line In 1 Sockets
  3. DC Input Socket
  1. Remote Control Transmitter
  2. Cinema/Game Button
  3. Standard Button
  4. Volume Up Button
 5. Subwoofer Level Down Button
  6. Volume Down Button
  7. Bass/Treble Button
  8. TV Operation Buttons
 9. On/Stand-by Button
10. Sport Button
11. News Button
12. Subwoofer Level Up Button
13. Dimmer Button
14. Mute Button
15. Line Button
Remote Control
Notes:
Some models of SHARP TV may not be operable.
SHARP TV remote will not work with HT-SB250(BK)/HT-SB250(W) system.
TV Operation Buttons (Only SHARP TV):
On/Stand-by
Button 
Sets the TV
power to “ON”
or “STAND-BY”.
Input Select
Button (TV) 
Press the
button to
switch the
input source. 
Volume Up
and Down
Buttons 
Turn up/down
the TV volume. 
Channel Up
and Down
Buttons 
Switch up/
down the TV
channels.
12 13
13 15
14
14
6 7 8 9 10
LEFT
RIGHT
LINE IN 1
LINE IN 2
1
2
3
1
10
9
11
14
15
12
13
3
2
4
5
7
6
8
11
2
3
4 5
1
1 – 2
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Download Sharp HT-SB250 (serv.man2) Service Manual (Repair Manual)

Here you can read online and download Sharp HT-SB250 (serv.man2) Service Manual in PDF. HT-SB250 (serv.man2) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp HT-SB250 (serv.man2) Home Theatre. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.