Sony hcd sa30 service manual

Page 2

HCD-SA30

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

This appliance is classified as
CLASS 1 LASER PRODUCT a CLASS I LASER product.
LUOKAN1 LASERLAITE The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.

KLASS 1 LASERAPPARAT

CAUTION

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

Notes on chip component replacement

I Never reuse a disconnected chip component.

I Notice that the minus side of a tantalum capacitor may be
damaged by heat.

Flexible Circuit Board Repairing

I Keep the temperature of soldering iron around 270°C
during repairing.

I Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

I Be careful not to apply force on the conductor when soldering
or unsoldering.

SAFETY CHECK-OUT

After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:

Checkthe antenna terminals, metal trim, metallized knobs, screws,
and all other exposed metal pans for AC leakage. Check leakage as
described below.

SAFETY-RELATED COMPONENT WARNING I!

COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINEWITH
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.

2

LEAKAGE

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 microampers).

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

1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-S40A. Follow the manufacturers instructions to use these
instruments.

2. A batteronperated 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 batteryioperated AC voltmeter. The limit" indication
is 0.75 V, so analog meters must have an accurate lowivoltage
scale. The Simpson 250 and Sanwa SHA63Trd are examples of
a p sive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

To Exposed Metal
Paris on Set

AC
valtmetel

(o. 75 V)
'5 Earth Ground

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

Unleaded solder

Boards requiring use of unleaded 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.)

If : LEAD FREE MARK

Unleaded solder has the following Characteristics.

I 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 pattem (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur 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.