Sony dvpfx 930 service manual

Page 2

DVP-FX921/FX921 K/FX930/FX930CC/FX930WM/FX935

SAFETY CHECK-OUT

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

1. Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes
and bridges.

2. Check the interboard wiring to ensure that no wires are pinched
or contact highewattage resistors.

3. Look for unauthorized replacement parts, particularly transistors,
that were installed during a previous repair. Point them out to
the customer and recommend their replacement.

4. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and recommend
their replacement.

5. Check the line cord for cracks and abrasion. Recommend the

replacement of any such line cord to the customer.

Check the B+ voltage to see it is at the values specified.

7. Check the antenna temiinals, metal trim, metallized knobs,
screws, and all other exposed metal pans forAC leakage. Check
leakage as described below.

.3

To Exposed Metal

Pans on Set
AC
0.15 F g 1.5 kn / voltmeter
(a. 75 V)

-T- Earth Ground

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

WARNINGI!
WHEN SERVICING, DO NOT APPROACH THE LASER
EXIT WITH THE EYE TOO CLOSELY. IN CASE IT IS
NECESSARY TO CONFIRM LASER BEAM EMISSION,
BE SURE TO OBSERVE FROM A DISTANCE OF MORE
THAN 25 cm FROM THE SURFACE OF THE OBJEC-
TIVE LENS ON THE OPTICAL PICK-UP BLOCK.

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. RE-
PLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOVSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS iDENTIFiES PAR UNE MARQUE A
sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE DE
FONCTIONNEMENT. NE REMPLACER GES COMPOSANTS
QUE PAR DES PIECES S0Nv DONT LES NUMEnos SONT
DONNES DANS CE MANUEL ou DANS LES SUPPLE-
MENTS PUBLiES PAR SONY.

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 chass , must not exceed 0.5 mA (500 microamperes).

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

I. A commercial leakage tester, such as the Simpson 229 or RCA
WT4540A. Follow the manufacturers instructions to use these
instruments.

2. A batteryeoperated 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 voltmeter. The limit" indication
is 0.75V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples ofa
passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)

CAUTION:
The use of optical instrument with this product will increase eye
hazard.

CAUTION

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

cuss l LASER PRODUCT
LASER KLASSE i

LUOKAN I LASERLAITE
KLASS t LASERAPPARAT

This label is located on the
bottom of the unit,

This appliance is classified as a
CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT
MARKING is located on the
bottom of the unit.

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.)

t . EAD FREE MARK

Unleaded solder has the following characteristics.

- 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 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.