SD-AT50H (serv.man18) - Sharp Audio Service Manual (repair manual)

sd-at50h (serv.man18) service manual
Model
SD-AT50H (serv.man18)
Pages
76
Size
4.23 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / Home Theatre
File
sd-at50h-sm18.pdf
Date

Read Sharp SD-AT50H (serv.man18) Service Manual online

SD-AT50H
No. ?????????????
 CONTENTS
Page
SAFETY PRECAUTION FOR SERVICE MANUAL ...........................................................................................................  2
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) ..........................................................................................................  2
SPECIFICATIONS .............................................................................................................................................................  3
NAMES OF PARTS ...........................................................................................................................................................  4
DISASSEMBLY ..................................................................................................................................................................  6
ADDITIONAL DESCRIPTION ............................................................................................................................................  8
ADJUSTMENT ...................................................................................................................................................................  9
DESCRIPTION OF CIRCUIT FOR 1-BIT UNIT .................................................................................................................  9
TO CHECK AND CANCEL PROTECT CIRCUIT DETECTION LINE ..............................................................................   10
BLOCK DIAGRAM ...........................................................................................................................................................  11
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD .............................................................................................  20
VOLTAGE ........................................................................................................................................................................  41
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................  42
TYPES OF TRANSISTOR AND LED ...............................................................................................................................  42
WAVEFORMS OF 1-BIT CIRCUIT ..................................................................................................................................  43
FUNCTION TABLE OF IC ................................................................................................................................................  44
REPLACEMENT PARTS LIST/EXPLODED VIEW
PACKING METHOD (FOR U.K. ONLY)
SERVICE MANUAL
SHARP CORPORATION
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
1-BIT DIGITAL HOME CINEMA
MODEL   
SD-AT50H
SD-AT50H
– 2 –
Precaution to be taken when replacing and servicing the
Laser Pickup.
The AEL (Accessible Emission Level) of Laser Power Output
for this model is specified to be lower than Class 1
Requirements. However, the following precautions must be
observed during servicing to protect your eyes against exposure
to the Laser beam.
(1) When the cabinet has been removed, the power is turned
on without a compact disc, and the Pickup is on a position
outer than the lead-in position, the Laser will light for several
seconds to detect a disc. Do not look into the Pickup Lens.
(2) The Laser Power Output of the Pickup inside the unit and
replacement service parts have already been adjusted prior
to shipping.
(3) No adjustment to the Laser Power should be attempted
when replacing or servicing the Pickup.
(4) Under no circumstances look directly into the Pickup Lens
at any time.
(5) CAUTION - Use of controls or adjustments, or performance
of procedures other than those specified herein may result
in hazardous radiation exposure.
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
UNIT
SHORT-CIRCUIT
AC POWER
SUPPLY CORD
CONNECT THE PROBE
TO GND OF CHASSIS
SCREW
WITHSTANDING
VOLTAGE TESTER
SAFETY PRECAUTION FOR SERVICE MANUAL
Laser Diode Properties
Material: AIGaAs/InGaAIP
Wavelength: 780 nm/650 nm
Emission Duration: continuous
Laser Output: max. 0.69 mW
ADVERSEL-SYNLIG OG USYNLIG LASERSTRÅLING VED ÅBNING. SE IKKE IND I
STRÅLEN-HELLER  IKKE  MED  OPTISKE  INSTRUMENTER.
VARO! AVATTAESSA OLET ALTTIINA NÄKYVÄLLE JA NÄKYMÄTTÖMÄLLE 
LASERSÄTEILYLLE ÄLÄ TUIJOTA SÄTEESEEN ÄLÄKÄ KATSO SITÄ OPTISEN 
LAITTEEN LÄPI.
VARNING-SYNLIG OCH OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR 
ÖPPNAD. STIRRA EJ IN I STRÅLEN OCH BETRAKTA EJ STRÅLEN GENOM 
OPTISKT INSTRUMENT.
VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA KUIN TÄSSÄ
KÄYTTÖOHJEESSA MAINITULLA TAVALLA SAATTAA ALTISTAA
KÄYTTÄJÄN TURVALLISUUSLUOKAN 1 YLITTÄVÄLLE NÄKYVÄLLE JA
NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE.
VARNING - OM APPARATEN ANVÄNDS PÅ ANNAT SÄTT ÄN I DENNA
BRUKSANVISNING SPECIFICERAS. KAN ANVÄNDAREN UTSÄTTAS FÖR
SYNLIG OCH OSYNLIG LASERSTRÅLNING, SOM ÖVERSKRIDER GRÄNSEN
FÖR LASERKLASS 1.
– 3 –
SD-AT50H
SPECIFICATIONS
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
AV control unit
Dimensions
Width: 215 mm (8-1/2")
Height: 58 mm (2-5/16")
Depth: 261 mm (10-5/16")
Weight
1.3 kg (2.9 lbs.)
Audio input terminals
Optical digital input (AUX): Square type   1
Coaxial digital input (DVD/CD): RCA type   1
Analog input (DVD/CD): RCA type   1 pair (L/R)
Analog input (TV): RCA type   1 pair (L/R)
Analog input (VCR): RCA type   1 pair (L/R)
Analog input (AUX): RCA type   1 pair (L/R)
Audio output terminal Headphones: 16 - 50 ohms (recommended: 32 ohms)
Other terminals
System control   3
Frequency range
FM: 87.5 - 108 MHz
AM: 522 - 1,620 kHz
Subwoofer/amplifier unit
Front/centre/surround speakers
Power source
AC 230 V, 50 Hz
Power consumption
80 W
Dimensions
Width: 260 mm (10-1/4")
Height: 373 mm (14-11/16")
Depth: 421 mm (16-5/8")
Weight
10.3 kg (22.7 lbs.)
Output power
Front speakers:
RMS: 100 W (50 W + 50 W) (10 % T.H.D., 1 kHz)
Centre speaker:
RMS: 50 W (10 % T.H.D., 1 kHz)
Surround speakers:
RMS: 100 W (50 W + 50 W) (10 % T.H.D., 1 kHz)
Subwoofer:
RMS: 50 W (10 % T.H.D., 100 Hz)
Amplification system
2.8224 MHz (64fs) 1-bit switching (remarks: fs = 44.1 kHz)
A/D noise shaping
7th-order 
   (delta - sigma) modulation
Terminals
Front speakers, Centre speaker, Surround speakers: 4 
ohms
System control   2
Subwoofer
Type
16 cm (6-1/2") woofer
Maximum input power 100 W
Rated input power
50 W
Impedance
4 ohms
Type
Full range speaker system (magnetic shield)
8 cm (3-1/8") Speaker
Maximum input power 100 W
Rated input power
50 W
Impedance
4 ohms
Dimensions
Width: 95 mm (3-3/4")
Height: 114 mm (4-1/2")
Depth: 104 mm (4-1/8")
Weight
0.7 kg (1.5 lbs.)/each
SD-AT50H
– 4 –
NAMES OF PARTS
AV control unit 
1. RDS Indicator
2. Radio Text Indicator
3. Traffic Programme Indicator
4. Traffic Announcement Indicator
5. Dynamic PTY Indicator
6. Audio Signal Indicators/Speaker Indicators
7. Timer Play Indicator
8. Sleep Indicator
9. FM stereo mode indicator
10. FM Stereo Receiving Indicator
11. On/Stand-by Button
12. Timer Set Indicator
13. Function Button
14. Digital/Analog Input Select or Tuner Band Select Button
15. Volume Up and Down Buttons
16. Remote Sensor
17. Power Indicator
18. Sound Mode Indicators 
19. Headphone Socket
20. System Connection Socket (to DVD player)
21. Audio Digital Input Socket
22. Coaxial Digital Audio Input Socket
23. Audio Input Sockets
24. System Connection Sockets (to subwoofer/amplifier unit)
25. AM Loop Aerial Terminal
26. Aerial Earth Terminal
27. FM 75 Ohms Aerial Socket
Display
Front
Back
12 13 14
15
16
18
19
1
7
8
9
3
2
4
5
6
(1)
(7)
(8)
(2) (3) (4) (5) (6)
(9) (10)
(11)
(12) (13)
20
21
22
23
25 26
27
24
17
11
10
MODEL NO. SD-AT50H
(AV CONTROL UNIT)
1-BIT DIGITAL HOME CINEMA  
SHARP CORPORATION          
                                                                          MADE IN MALAYSIA
<The bottom of the unit>
(1)  Left Front Speaker Indicator
(8)  Subwoofer Indicator
(2)  Front Left Signal Indicator
(9)  Left Surround Speaker Indicator
(3)  Centre Speaker Indicator
(10) Surround Left Signal Indicator
(4)  Centre Signal Indicator
(11) Surround Monaural Signal 
Indicator
(5)  Front Right Signal Indicator
(6)  Right Front Speaker Indicator
(7)  Low Frequency Effect Indicator
(12) Surround Right Signal Indicator
(13) Right Surround Speaker Indicator
Subwoofer/amplifier unit 
1. Subwoofer
2. Bass Reflex Duct
3. System Connection Socket (to AV control unit)
4. Speaker Terminals
5. System Connection Socket (to AV control unit)
6. AC Power Input Socket
7. Lead Holder
Satellite speaker  5
Front speaker   2: magnetically shielded
Centre speaker   1: magnetically shielded
Surround speaker   2: magnetically shielded
1. Speaker
2. Speaker Terminals
3. Mounting Holes for Stand or Bracket (Optionally available)
Using antislip speaker cushions:
You can install satellite speakers either vertically or horizontally.
Affix the cushions (supplied) to the bottom of the speakers to prevent them from slid-
ing or falling due to vibration.
A sheet of speaker cushions (20 pcs.) is supplied with this product. Use 4 cushions
per speaker.
3
4
5
6
7
2
1
1
2
3
Front
Back
Bottom
Side
(Vertical position)
(Horizontal position)
Page of 76

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Here you can read online and download Sharp SD-AT50H (serv.man18) Service Manual in PDF. SD-AT50H (serv.man18) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp SD-AT50H (serv.man18) 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.