XL-HP404 (serv.man13) - Sharp Audio Service Manual (repair manual). Page 2

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XL-HP404E/HP404H
1 – 1
Audio
XL-HP404E/HP404H
Service Manual
XL-HP404H
Market
E
 
CHAPTER 1. 
GENERAL DESCRIPTION
[1] SAFETY PRECAUTION FOR SERVICE
MANUAL
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 with-
out 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 replace-
ment 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 pro-
cedures other than those specified herein may result in hazardous
radiation exposure. 
[2] 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.
(FOR U.K.)
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
(EXCEPT FOR U.K.)
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA KUIN TÄSSÄ
KÄYTTÖOHJEESSA MAINITULLA TAVALLA SAATTAA
ALTISTAA KÄYTTÄJÄN TURVALLISUUSLUOKAN 1
YLITTÄVÄLLE NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE.
VARNING - OM APPARATEN ANVÄNDS PÅ ANNAT SÄTT ÄN
I DENNA BRUKSANVISNING SPECIFICERAS. KAN
ANVÄNDAREN UTSÄTTAS FÖR OSYNLIG LASER-
STRÅLNING, SOM ÖVERSKRIDER GRÄNSEN FÖR
LASERKLASS 1.
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.
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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