Sony cx jn 3 service manual

Page 2

CX-JN3

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 dur-
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.

CAUTION

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

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

at A55 PnondcT
LUOKAN a ITE
mass 1 LASERAPPARAT

The following caution label is located inside the unit.

CAUTION I INVISIBLE LASER RADIATION WHEN OVEN AND
mmocxs mango mm moms m am
ADVARSEL ; USVNLIG Ltssasrmwe on Ame NAR
SIKKERHEDSAFBRVDERE ER UDE AF FUNKHDN. UNDGA UDSAEWELSE
FDR SIKALING

VORSICHT I UNSICHTEARE LASERSWAHLUNG WENN
Manama oEoFFNEr imp smgamsvgamgame
UBERERUCKI NICHY DEM SYRAHL AUSSETZEN

VA H 0 I ' nvATrnEssAJA SUOJALUKITUS oHlTETrAEssA OLET ALL
TIINA NAKYMAYTOMALLE LASEKSAYEILYLLE ALA KATSO SATEESEEN
V-ARN | NG ; 0ststgammawummmaopm
OCH SPARREN AR URKOPPLAD BETRAKM EJ SYRALEN
ADVERSEL I USYNLIG LASERSTRALING NAR DEKSEL APNES DG
SIKKERHEDSMS ERVTES UNNGA EKSPONERING FOR STRALEN
V-l GYAZAT. . A Bumwymsm LATHATATLAN nggm
mat/252m mm A azsmmsw

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.

SAFETY CHECK-OUT

After correcting the original service problem, perform the followA
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 part to earth ground and

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

return to cha , must not exceed 0.5 ntA (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 milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3. Measuring the voltage drop across a re. ' 'tor by means of a
VOM or batteryeoperated AC voltmeter. The limit indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 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 suit-
able. (See Fig.A)

To Exposed Metal
Parts on Set

AC
/ voltmeter
(0. 75 V)

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