SD-EX100H (serv.man21) - Sharp Audio Service Manual (repair manual)

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 • 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.

Page

SAFETY PRECAUTION OF CD SECTION FOR SERVICE MANUAL ..............................................................................   2
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) ..........................................................................................................  2
SPECIFICATIONS .............................................................................................................................................................  3
NAMES OF PARTS ...........................................................................................................................................................  3
DISASSEMBLY ..................................................................................................................................................................  5
REMOVING AND REINSTALLING THE MAIN PARTS .....................................................................................................  8
WIRING PROCESS DIAGRAM .........................................................................................................................................  8
EXPLANATION OF CD MECHANISM ...............................................................................................................................  9
ADJUSTMENT .................................................................................................................................................................  14
DESCRIPTION OF CIRCUIT FOR 1-BIT UNIT ...............................................................................................................  16
TO CHECK AND CANCEL PROTECT CIRCUIT DETECTION LINE ..............................................................................   17
TEST MODE ....................................................................................................................................................................  18
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................  23
TYPES OF TRANSISTOR AND LED ...............................................................................................................................  23
VOLTAGE ........................................................................................................................................................................  24
BLOCK DIAGRAM ...........................................................................................................................................................  25
SCHEMATIC DIAGRAM ..................................................................................................................................................  30
WIRING SIDE OF P.W.BOARD .......................................................................................................................................  45
WAVEFORMS OF 1-BIT CIRCUIT ..................................................................................................................................  58
WAVEFORMS OF CD CIRCUIT ......................................................................................................................................  59
CD OPTICAL PICKUP LENS CLEANING ........................................................................................................................ 61
TROUBLESHOOTING .....................................................................................................................................................  61
FUNCTION TABLE OF IC ................................................................................................................................................  66
CONNECTION OF EXTENSION CABLE ........................................................................................................................  80
FL DISPLAY .....................................................................................................................................................................  85
PARTS GUIDE/EXPLODED VIEW

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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.

Laser Diode Properties

Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 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.

 

Laser Diode Properties

Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW

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

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AC 230 V, 50 Hz

Power on: 35 W

Power stand-by: 0.6 W

Width: 332 mm (13-1/8") 
Height: 206 mm (8-1/8") 
Depth: 178 mm (7")

5.1 kg (11.2 lbs.)

Speakers: 4 ohms

Headphones: 16 - 50 ohms (recommended: 32 ohms)

Digital output (optical)

Auxiliary input: 500 mV/47 k ohms

64fs 1-bit switching (Remarks: fs = 44.1 kHz)

RMS: 50 W (25 W + 25 W) (DIN 45 324)

7th-order 

   (delta - sigma) modulation

1-disc slot-in type compact disc player

Non-contact, 3-beam semiconductor laser pickup

24-bit/96 k D/A converter

20 - 20,000 Hz

90 dB (1 kHz)

FM: 87.5 - 108 MHz

AM: 522 - 1,620 kHz

2-way type speaker system

2 cm (13/16") Tweeter

11 cm (4-3/8") Woofer

50 W

25 W

4 ohms

Width: 155 mm (6-1/8") 
Height: 280 mm (11-1/16") 
Depth: 210 mm (8-5/16")

2.8 kg (6.2 lbs.)/each

Specifications for this model are subject to change without
prior notice.

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Make sure nothing comes into contact with 
the speaker diaphragms when you remove 
the speaker grilles.

Attach the cushions to the bottom of the 
speakers to prevent them from sliding.

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1. Remote Control Transmitter
2. On/Stand-by Button
3. CD Stop Button
4. CD Fast Reverse/Tuning Down Button
5. Auxiliary Input Button
6. Cursor/Tuner Preset Buttons
7. Volume Up and Down Buttons
8. CD Programme Button
9. Clear Button

10.Timer Button
11.Surround Button
12.CD Play Mode Select Button
13.Time Display/Dimmer Button
14.CD Play/Pause Button
15.Preset Equaliser Button
16.CD Fast Forward/Tuning Up Button
17.Tuner (Band) Button
18.Enter Button
19.Extra Bass Button
20.CD/Tuner Direct Buttons
21.CD Time Display Button
22.RDS ASPM (Auto Station Programme Memory) Button
23.RDS Programme Type/Traffic Information Search Button
24.RDS Display Button

Buttons with " " mark in the illustration can be operated on the remote control only.