CDP-970
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety 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.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having areturn to chassis, must
not exceed 0.5 mA (500 microampers). Leakage
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 instru-
ments.
2. Abattery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3.
Measuring the voltage drop across aresistor by
means of aVOM or battery-operated AC volt-
meter. 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 apassive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a2VAC range are
suitable. (See Fig. A)
To Exposed Meta!
Parts or) Set
AC
voltmeter
(0.75 VI
—Earth Ground
Fig, A. Using an AC voltmeter to check AC leakage.
0. 15iiF r
II.SkQ,
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
This set employs alaser. Therefore, be sure to fol-
low carefully the instructions below when servicing.
CAUTION
Use of controls or adjustments or performance
of procedures other than those specified herein
may result in hazardous radiation exposure.
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 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.
1.Laser Diode Properties
•Material: GaAIAs
•Wavelength: 780 nm
•Emission Duration: continuous
•Laser Output: max. 44.6 pW*
*This output is the value measured at adistance of
about 200 mm from the objective lens surface on
the Optical Pick-up Block.
2. During service, do not take the Optical Pick-up
Block apart, and do not adjust the APC circuit.
If there is abreakdown in the APC circuit (includ-
ing laser diode), replace the entire Opticcal Pick-
up Block (including APC borad).
VAROITUS: Laite sisaltaa, laserdiodin, joka lahettaa
(nakymatbnta) silinille vaarallista lasersateilya.
BESKYTTELSE AF 0JNE MOD LASERSTRALING UNDER SERVICE
1. Laser-didoe data
•Matehale: GaAIAs •Udstraling: Kontinuerlig
•Belgelaengde: 780 nm •Laseroutput: Max. 0,4 mW*
*Malt i1,6 mm afstand fra overfladen af objektiv-
linsen pa den optiske pick-up enhed.
•Klassifikation: Klasse Illb.
Idette apparai anvendes laserlys. Derfor skal
nedensiaende insiruktioner n0je f0lges under service.
p0lg i0vrigi insirukiionerne iservicemanualen.
ADVAR5EU!
Under service mft ojnene ikke komme naer objektiv-linsen
pd den optiske pick*up enhed. Itilfaelde af at det er
nedvendigt at kontrollere udsendelsen af laserlys. skal
det ske ien afstand af mere end 25 cm fra den optiske
pick-up.
LASER ADVARSEL M/ERKNING
Falgende macrkning findes indvendig iapparatet:
1. Advarsel Macrkning
2. Adskil aldrig den optiske pick-up enhed under
service, ogjuster ikke APC kredslebet (Au tomatic
Power Control). Hvis APC kredslobet (inch laser-
dioden) bryder ned, skal hele den optiske pick-up
enhed (inch APC printkortet) udskiftes.
SAFETY-RELATED COMPONENT WARNIN«I!
COMPONENTS IDENTIFIED BY MARK ^OR [JOTTED
LINE WITH MARK ^ON THE SCHEMATIC DIA^jRAMS
AND IN THE PARTS LIST ARE CRITICAL XO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APh^AR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMEU-TS PUB-
LISHED BY SONY.
—2-
