XL-55 (serv.man22) - Sharp Audio Service Manual (repair manual)

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Page

SAFETY PRECAUTION FOR SERVICE MANUAL ..........................................................................................................  2
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) .........................................................................................................  2
SPECIFICATIONS ............................................................................................................................................................  3
NAMES OF PARTS ..........................................................................................................................................................  4
DISASSEMBLY .................................................................................................................................................................  6
REMOVING AND REINSTALLING THE MAIN PARTS ....................................................................................................  7
ADJUSTMENT ..................................................................................................................................................................  9
TEST MODE ...................................................................................................................................................................  10
ERROR LIST ..................................................................................................................................................................  14
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................  15

 TYPES OF TRANSISTOR AND LED ..............................................................................................................................  15

BLOCK DIAGRAM ..........................................................................................................................................................  16

 SCHEMATIC DIAGRAM .................................................................................................................................................  20
 WIRING SIDE OF P.W.BOARD ......................................................................................................................................  32
 WAVEFORMS OF CD CIRCUIT .....................................................................................................................................  37
 TROUBLESHOOTING ....................................................................................................................................................  38

FUNCTION TABLE OF IC ..............................................................................................................................................  44

 LCD SEGMENT ..............................................................................................................................................................  51

PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (FOR U.K. ONLY)

Illustration XL-65H

(XL-65H ONLY)

(Except for U.K.)

 • 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.

Illustration XL-55H

 

Recording and playback of any material may require consent,
which SHARP is unable to give. Please refer particularly to the
provisions of Copyright Act 1956, the Dramatic and Musical
Performers Protection Act 1956, the Performers Protection Acts
1963 and 1972 and to any subsequent statutory enactments and
orders.

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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 I 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

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.

(For U.K.)

(Except for U.K.)

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-CIRCUT
AC POWER
SUPPLY CORD

CONNECT THE PROBE
TO GND OF CHASSIS
SCREW TERMINAL

WITHSTANDING

VOLTAGE TESTER

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FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.

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AC 230 V, 50 Hz

Power on: 50 W

Power stand-by: 0.6 W

Width: 160 mm (6-5/16") 
Height: 240 mm (9-1/2") 
Depth: 297 mm (11-11/16")

3.6 kg (8.0 lbs.)

PMPO: 120 W (total)

MPO: 60 W (30 W + 30 W) (DIN 45 324)

RMS: 40 W (20 W + 20 W) (DIN 45 324)

Speakers: 4 ohms

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

CD digital output (optical)

Video/Auxiliary (audio signal): 500 mV/47 k 
ohms

FM: 87.5 - 108 MHz

AM: 522 - 1,620 kHz

Compact disc player

Non-contact, 3-beam semiconductor laser 
pickup

1-bit D/A converter

20 - 20,000 Hz

90 dB (1 kHz)

50 - 14,000 Hz (normal tape)

50 dB (recording/playback)

0.3 % (DIN 45 511)

2-way type speaker system

Tweeter

10 cm (4") woofer

40 W

20 W

4 ohms

Width: 160 mm (6-5/16") 
Height: 240 mm (9-1/2") 
Depth: 200 mm (7-7/8")

2.0 kg (4.4 lbs.)/each

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

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AC 230 V, 50 Hz

Power on: 50 W

Power stand-by: 0.6 W

Width: 160 mm (6-5/16") 
Height: 240 mm (9-1/2") 
Depth: 297 mm (11-11/16")

3.6 kg (8.0 lbs.)

RMS: 40 W (20 W + 20 W) (10 % T.H.D.)

Speakers: 4 ohms

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

CD digital output (optical)

Video/Auxiliary (audio signal): 500 mV/47 k 
ohms

FM: 87.5 - 108 MHz

AM: 522 - 1,620 kHz

Compact disc player

Non-contact, 3-beam semiconductor laser 
pickup

1-bit D/A converter

20 - 20,000 Hz

90 dB (1 kHz)

50 - 14,000 Hz (normal tape)

50 dB (recording/playback)

0.25 % (WRMS)

2-way type speaker system

Tweeter

10 cm (4") woofer

40 W

20 W

4 ohms

Width: 160 mm (6-5/16") 
Height: 240 mm (9-1/2") 
Depth: 200 mm (7-7/8")

2.0 kg (4.4 lbs.)/each

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15. Timer Play Indicator
16. Tape Record Indicator
17. Sleep Indicator
18. CD Random Play Indicator
19. Memory Indicator
20. FM Stereo Mode Indicator
21. FM Stereo Receiving Indicator
22. Surround Indicator
23. CD Play Indicator
24. CD Repeat Play Indicator
 
25. CD Digital Output Socket
26. AC Power Input Socket
27. FM 75 Ohms Aerial Socket
28. AM Loop Aerial Socket
29. Video/Auxiliary (Audio Signal) Input Sockets
30. Speaker Terminals

5. Remote Control Transmitter
6. Clock Button
7. On/Stand-by Button
8. CD Button
9. Tuner and Band Selector Button

10. Clear Button
11. Memory Button
12. CD Track Down, Tuner Preset Down Button
13. CD Fast Reverse, Tuning Down, 

Tape Rewind Button 

14. CD or Tape Play Button
15. Surround Button
16. CD or Tape Stop Button
17. Volume Up and Down Buttons
18. Bass Up and Down Buttons
19. Timer Button
20. Sleep Button
21. Video/Auxiliary Button
22. Tape Button
23. Repeat Button
24. Random Button
25. CD Track Up, Tuner Preset Up Button
26. CD Fast Forward, Tuning Up,

Tape Fast Forward Button

27. Tape Record Pause Button
28. CD Pause Button
29. Treble Up and Down Buttons

 

Buttons with " " mark in the illustration or highlighted in bold on 
the right can be operated on the remote control only.

 

Speaker grilles are removable:
Make sure nothing comes into contact with the 
speaker diaphragms when you remove the speak-
er grilles.