Sony cdp 970 service manual

Page 2

GDP-970

SAF ETY 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 pans to any
exposed metal part having a return to Chassis, must
not exceed 0.5 mA (500 microainpers). Leakage
current can be measured by any one of three

methods.

1. A commercial leakage tester, such as the
Simpson 229 or RCA WTv540A. Follow the
manufacturers instructions to use these instru-
merits.

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 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 a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are
suitable. (See Fig. A)

To Exposed Metal

Part: on Set
rm |
A C
0. ram 1.51m voltmeter
(0. 75 VI

Earth Ground
Fig, A. Using an AC voltmeter to check AC leakage.

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING

This set employs a laser. 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

0 Material: GaAlAs
I Wavelength: 780 nm
0 Emission Duration: continuous
0 Laser Output: max. 44,6 uw
* This output is the value measured at a distance 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 span, and do not adjust the APC circuit.
If there is a breakdown in the APC circuit (includ»
ing laser diode), replace the entire Optiocal Pick»
up Block (including APC borad).

VAROITUS: Laite sisaltaa, laserdiodin,joka lahettia
(nakymaténta) siliiiille vaarallista Iasersateilya.

BESKYTTELSE AF GJNE MOD LASERSTRALING UNDER SERVICE

I dette apparat anvendes laserlys. Derfor skal
nedensiaende insiruklioner noje folges under service.

Folg iovrigt instrukiionernc i servicemanualen.

ADVARSEL

Under service ml linen: ikko kommo oar obloktiv-Iinsari
pl den optilke pick-up enhud. I tilts-Ida at at dot or
nodvendigt at kontvollere udundelun at iuertyx, skal
dot ska i an Itsmnd at more and 25 cm tn den optlskn
pickup,

LASER ADVARSEL MAERKNING

Folgende maerkning findes indvendig i apparatet:
l. Advarsel Mmrkning

CAUVION . mums inn sumo-i mu 0-
ma mum mm nom mow ro mm

ADVARSEL: mm use-silhma «an 04th
ul- mumnwumm u m a! mun-on mm
nesumu m sluhwe

l. Laser~didoe data
C Materiale: GaAlAs
o Bolgelaengde: 780 nm

* M511 i 1.6 mm afsiand m overfladen al obiektiv-
linsen pa den opliske pick-up enhed.

0 Klassifikation: Klasse lllb.

0 Udstraling:

2, Adskil aldrig den optiske pick-up exiled under
servxce, og juster ikke APC kredslabetUu tomatic
Power Control). Hvis APC kredslabet (incl. laser-
dioden) bryder ned, skal hele den optiske pick~up
enhed (incl. APC printkortet) udskiftes.

sAFETV-HELATED COMPONENT WARNING

COMPONENTS IDENTIFIED av MARK A on DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRMS
AND IN THE PARTS LIST ARE CRITICAL TD SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
soNv PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL on IN SUPPLEMEMI'S PUB-
LISHED av SONY.

Kontinuerlig
o Laseroutput: Max, 0,4 mW