Sony hcd mx 500i mx 550i

Page 2

HCD-MX500i/MX550i
Ver. 1.1

NOTES ON CHIP COMPONENT REPLACEMENT

' Never reuse a disconnected chip component.

' Notice that the minus side ofa tantalum capacitor may be dame
aged 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.

Laser component in this product is capable ol emitting radiation
exceeding the limit for Class 1.

This appliance is classified as
a CLASS 1 LASER product.
This marking is located on the
rear or bottom exterior.

CLASSl LASER PRODUCT
LUOKAN 1 LASERLAITE

KLASS 1 LASERAPPARAT

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
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A sun
LES DIAGRAMMES SCHEMATIQUES ET LA LISTE DES
PIECES SONT CRITIQUES POUR LA SECURITE DE FONC-
TIONNEMENT. NE REMPLACER CES COMPOSANTS QUE
PAR DES PIECES SONY DONT LES NUMEROS SONT DON-
NES DANS CE MANUEL ou DANS LES SUPPLEMENTS
PUBLIES PAR SONY.

iTifitfi fi$§fil¢fi§§fi

EEETDSIWEE'éWfifiAia-Efiggfillfik EZififiAiBSEJJi
£§Ffi§f<fi9$§ll¢. iii-T-Etélilfiiééiia Etfifiar, LEEEIME
$$M§S€§Efl§i§flflfifififl$flfl$§flfifiWith?. Emififi
filfiqglfiifiififin

2

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow,
ing safety check before releasing the set to the customer:

Check the antenna terminals, metal trim, metallized knobs,
screws, and all other exposed metal pans 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 a

return to chassis, must not exceed 0.5 mA (500 microamperes.).

Leakage current can be measured by any one of three methods.

I. Acommercial leakage tester, such as the Simpson 229 or RCA
WTA540A. 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 batteryaoperated AC voltmeter. The limit indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SHEG3Trd 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
Parts on Set

A C
/ voltmeter
(0.75 V)

g 1.5kQ

0.15pF

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