Sony MDS-E12 - Page 3

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NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
This appliance is classified as a
CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT
MARKING is located on the
rear exterior.
CLASS 1 LASER PRODUCT
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT
This caution
label is located
inside the unit.
; INVISIBLE LASER be oan WHEN OPEN.
CAUTION AVOID EXPOSURE TO BEA!
3 USYNLIG LASERSTRALING VED ro NAR
ADVARSEL EEE DeATERND ERE ER UDE AF ce
UDS /ETTELSE FOR STRALIN
VARO! + AVATTAESSA JA SUOJALUKITUS CHITETTAESSA
DLET ALTTIINA LASERSATEILYLL
VARNING
} LASERSTRALING NAR DENNA DEL AR OPPNAD
OCH SPARREN AR URXOPPLAD.
ADVARSEL ;
USYNLIG_LASERSTRALING NAR DEKSEL APNES
UNNGA EKSPONERING FOR STRALEN.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
Notes on chip component replacement
* Never reuse a disconnected chip component.
* Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
¢ Keep the temperature of soldering iron around 270°C
during repairing.
¢ Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
* Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINE WITH
MARK A ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
ALA SECURITE!
LES COMPOSANTS IDENTIFES PAR UNE MARQUE A\ SUR LES
DIAGRAMMES SCHEMATIQUES ET LA LISTE DES PIECES SONT
CRITIQUES POUR LA SECURITE DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIESES SONY
DONT LES NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPEMENTS PUBLIES PAR SONY.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturer’s instructions.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. Acommercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
|| a7sy
= Earth Ground
. Using an AC voltmeter to check AC leakage.