SAFETY CHECK-OUT
After correcting the original service problem, perform the following
Laser component in this product is capable of emitting radiation
safety checks before releasing the set to the customer:
exceeding the limit for Class 1.
Check the antenna terminals, metal trim, Ometallized� knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
This appliance is classified asdescribed below.
a CLASS 1 LASER product.
The CLASS 1 LASERLEAKAGE
PRODUCT MARKING is
located on the rear exteriorThe .AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
The following return to chassis, must not exceed 0.5 mA (500 microamperes).
caution labelLeakage current can be measured by any one of three methods.
is located
inside of the1. A commercial leakage tester, such as the Simpson 229 or RCA
unit.WT-540A. Follow the manufacturersO 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 resistor by means of a
VOM or battery-operated AC voltmeter. The Olimit� indication
is 0.75 V, so analog meters must have an accurate low-voltage
CAUTIONscale. The Simpson 250 and Sanwa SH-63Trd are examples of
Use of controls or adjustments or performance of proceduresa passive VOM that is suitable. Nearly all battery operated
other than those specified herein may result in hazardousdigital multimeters that have a 2V AC range are suitable. (See
radiation exposure.Fig. A)
Notes on chip component replacementTo Exposed Metal
Y Never reuse a disconnected chip component.Parts on Set
Y Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
AC
Y Keep the temperature of soldering iron around 270uCVoltmeter
0.15 ?F1.5 k1
during repairing.(0.75 V)
Y Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
Y Be careful not to apply force on the conductor when soldering
or unsoldering.
Earth Ground
NOTES ON HANDLING THE OPTICAL PICK-UP
Fig. A. Using an AC voltmeter to check AC leakage.
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
MARK ! 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.
N 3 N |
ACEC
SONY
