HCD-CPX1
Notes on chip component replacement
CAUTION
YNever reuse a disconnected chip component.
Use of controls or adjustments or performance of proceduresY Notice that the minus side of a tantalum capacitor may be dam-
other than those specified herein may result in hazardous ra-
aged by heat.
diation exposure.
Flexible Circuit Board Repairing
YKeep the temperature of the soldering iron around 270 uC dur-
This appliance is
ing repairing.classified as a CLASS 1
Y Do not touch the soldering iron on the same conductor of theLASER product. This
circuit board (within 3 times).label is located on the
Y Be careful not to apply force on the conductor when solderingrear exterior.
or unsoldering.
SAFETY CHECK-OUTUNLEADED SOLDER
After correcting the original service problem, perform the follow-Boards requiring use of unleaded solder are printed with the lead-
ing safety check before releasing the set to the customer:free mark (LF) indicating the solder contains no lead.
Check the antenna terminals, metal trim, Ometallized� knobs,(Caution: Some printed circuit boards may not come printed with
screws, and all other exposed metal parts for AC leakage.the lead free mark due to their particular size)
Check leakage as described below.
: LEAD FREE MARK
LEAKAGE TESTUnleaded solder has the following characteristics.
The AC leakage from any exposed metal part to earth ground and
Y Unleaded solder melts at a temperature about 40 uC higher than
from all exposed metal parts to any exposed metal part having aordinary solder.
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Ordinary soldering irons can be used but the iron tip has to be
Leakage current can be measured by any one of three methods.applied to the solder joint for a slightly longer time.
1. A commercial leakage tester, such as the Simpson 229 or RCA
Soldering irons using a temperature regulator should be set to
WT-540A. Follow the manufacturersO instructions to use theseabout 350 uC.
instruments.
Caution: The printed pattern (copper foil) may peel away if the
2. A battery-operated AC milliammeter. The Data Precision 245heated tip is applied for too long, so be careful!
digital multimeter is suitable for this job.
Y Strong viscosity
3. Measuring the voltage drop across a resistor by means of a VOMUnleaded solder is more viscou-s (sticky, less prone to flow)
or battery-operated AC voltmeter. The Olimit� indication is 0.75
than ordinary solder so use caution not to let solder bridges oc-
V, so analog meters must have an accurate low-voltage scale.cur such as on IC pins, etc.
The Simpson 250 and Sanwa SH-63Trd are examples of a
Y Usable with ordinary solder
passive VOM that is suitable. Nearly all battery operated digitalIt is best to use only unleaded solder but unleaded solder may
multimeters that have a 2 V AC range are suitable. (See Fig. A)
also be added to ordinary solder.
To Exposed Metal
Parts on Set
AC
0.15 ?F1.5 k&voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
ATTENTION AU COMPOSANT AYANT RAPPORT
SAFETY-RELATED COMPONENT WARNING!!� LA S?CURIT?!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTEDLES COMPOSANTS IDENTIFI?S PAR UNE MARQUE 0
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMSSUR LES DIAGRAMMES SCH?MATIQUES ET LA LISTE
AND IN THE PARTS LIST ARE CRITICAL TO SAFE DES PIéCES SONT CRITIQUES POUR LA S?CURIT?
OPERATION. REPLACE THESE COMPONENTS WITHDE FONCTIONNEMENT. NE REMPLACER CES COM-
SONY PARTS WHOSE PART NUMBERS APPEAR ASPOSANTS QUE PAR DES PIéCES SONY DONT LES
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-NUM?ROS SONT DONN?S DANS CE MANUEL OU
LISHED BY SONY.DANS LES SUPPL?MENTS PUBLI?S PAR SONY.
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ACEC
SONY
