Sony icf cd 73 service manual

Page 2

ICF-CD73/CD73V

Notes on chip component replacement

- Never reuse a disconnected chip component.

- Notice that the minus side of a tantalum capacitor may be dam-
aged by heat

Flexible Circuit Board Repairing

- Keep the temperature of the soldering iron around 270 C durA
ing 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 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 parts for AC leakage.

Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal pan to earth ground and

from all exposed metal parts to any exposed metal part having a

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

Leakage current can be measured by any one of three methods

1. A commercial leakage tester, such as the Simpson 229 or RCA
WTA540A. Follow the manufacturers instructions to use these
instruments.

2. A battery-operated AC milliamtneter. The Data Precision 245
digital multimeter it 'uttable for this job.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The limit indica-
tion is 0.75 V, so analog meters must have an accurate low
voltage scale. The Sitnpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suitA
able. (See Fig. A)

To Exposed Metal
Parts on Set

A C
/ voltmeter
(0. 75 V)

0.15 F

g 1.5 kg

_ Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

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 PUB-
LISHED BY SONY.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.

UNLEADED SOLDER

Boards requiring use ofunleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.

(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

SI'V: LEAD FREE MARK
Unleaded solder has the following characteristics.

U

Unleaded solder melts at a temperature about 40 C higher than

ordinary solder.

Ordinary soldering irons can be used but the iron tip has to be

applied to the solderjoint for a slightly longer time.

Soldering irons using a temperature regulator should be set to

about 350 C.

Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

Strong viscosity

Unleaded solder is more viscouAs (sticky, less prone to flow)

than ordinary solder so use caution not to let solder bridges oce

cur such as on IC pins, etc.

Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may

also be added to ordinary solder.

sing the Ac power adaptor

When operating the ttnit with an external power source, do not remove the
batteries.

These batteries serve to backup the clock and memory settings. Since the
batteries discharge in this case as well. we recommend changing them abottt
once a year.

To prevent battery leakage. we recommend removing the batteries when the
unit is connected to a wall outlet.

Before connect g and disconnecting the external power source plug, be
sure to turn off the radio/CD. Otherwise, E may be displayed. When this
occurs,turn on the radio/CD so that E " disappears.

When the AC power adapter is not to be used for a long period of time,unplug
it both from the DC IN 6 Vjack and from the wall outlet.

When the cover of the DC IN 6 Vjack is open (to use the AC power adape
tor), the Jack area is not splashrresistant. When the AC power adaptor is not
connected to the DC IN 6 Vjack, be sure to close the cover of the DC IN 6
Viack.

Use the recommended Sony AC powcradaptor * only. The polarity of the
plugs of other manufacturers may be different. Failure to use the recomr
mended AC power adaptor may cause the unit to malfunction.

Supplied with Ettropeau model only

If you have any questions or problems concemiug your unit,please consult

your nearest Sony dealer.

Polarityoftheplug

About CD-Rs/CD-RWS

This unit is compatible with CDrRs/CDVRWs but playback capability may vary
depending on the quality of the dise,the recording device and application soft
ware.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
SUR LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
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.