Sony CDP-411 Service Manual page 3

SAFETY CHECK-OUT NOTES ON HANDLING THE OPTICAL PICK-
UP BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may
suffer electrostatic breakdown because of the poten-
tial difference gencrated 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
After correcting the original service problem,
perform the following safty check 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.
matter which is included in the repair parts.
The flexible board is easily damaged and should be
handled with care.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal part to any
exposed metal part having a retum to chassis, must
not exceed 0.5 mA (S00 microampers). Leakage
current can be measured by any one of three
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so
as to be focused on the disc reflective surface by the
methods. objective lens in the optical pick-up block. There-
fore, when checking the laser diode emission, observe
more than 25 cm away from the objective lens.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers' instructions to use these instm-
ments. 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
2. <A _ battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
eee KLASS 1 LASERAPPARAT
this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The "limit" indication is 0.75V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
The following caution label is located inside of the unit.
CAUTION — ;: INVISIBLE LASER RADIATION WHEN OPEN,
AVOID EXPOSURE TO BEAM.
- USYNLIG LASERSTRALING VED ABNING NAR
ADVARSEL : SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION.
UNDGAUDS /ETTELSE FOR STRANING.
VAROI : AVATTAESSA JA SUQJALUKITUS OHITETTAESSA
DLET ALTTIINA LASERSATEILYLLE.
VARNING _ : LASERSTRALING NAR DENNA DEL AR OPPNAD
OCH SPARREN AR URXOPPLAD.
ADVARSEL : USYNLIG LASERSTRALING NAR DEKSEL APNES
UNNGA EKSPONERING FOR STRALEN.
To Exposed Metal
Parts on Set
For customers of the model equipped
with the voltage selector
Check to confirm that the voltage selector is
set to the local power line voltage. If not, set
the voltage selector to the correct position
AC before connecting the AC power cord to a
voltmeter wall outlet.
(0.75V)
110-120 V [— 220-240V
ae
y NS
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakege.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE A
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
SAFETY-RELATED COMPONENT WARNINGI!!
COMPONENTS IDENTIFIED BY MARK A\ OR DOTTED
LINE WITH MARK /\ 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 PUB-
LISHED BY SONY.
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.