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— 5 —

6) Product Safety Notice-Some electrical and mechanical parts

have special safety-related characteristics which are often not
evident from visual inspection, nor can the protection they give
necessarily be obtained by replacing them with components rated
for higher voltage, wattage, etc. Parts that have special safety
characteristics are identified by shading, an (

) or a (

) on

schematics and parts lists. Use of a substitute replacement that
does not have the same safety characteristics as the
recommended replacement part might create shock, fire and/or
other hazards. Product safety is under review continuously and
new instructions are issued whenever appropriate.

— 6 —

 Before servicing units covered by this service manual

and its supplements, read and follow the Safety Precautions section
of this manual.

  If unforseen circumstances create conflict between the

following servicing precautions and any of the safety precautions,
always follow the safety precautions. Remember: Safety First.

(1) a. Always unplug the instrument’s AC power cord from the AC

power source before (1) re-moving or reinstalling any
component, circuit board, module or any other instrument
assembly, (2) disconnecting any instrument electrical plug or
other electrical connection, (3) connecting a test substitute in
parallel with an electrolytic capacitor in the instrument.

b. Do not defeat any plug/socket B+ voltage interlocks with

which instruments covered by this service manual might be
equipped.

c. Do not apply AC power to this instrument and/or any of its

electrical assemblies unless all solid-state device heat sinks
are correctly installed.

d. Always connect a test instrument’s ground lead to the

instrument chassis ground before connecting the test
instrument positive lead. Always remove the test instrument
ground lead last.

 Refer to the Safety Precautions section ground lead last.

(2) The service precautions are indicated or printed on the cabinet,

chassis or components. When servicing, follow the printed or
indicated service precautions and service materials.

(3) The components used in the unit have a specified flame

resistance and dielectric strength.
When replacing components, use components which have the
same ratings. Components identified by shading, by (

) or by

(

) in the circuit diagram are important for safety or for the

characteristics of the unit. Always replace them with the exact
replacement components.

(4) An insulation tube or tape is sometimes used and some

components are raised above the printed wiring board for safety.
The internal wiring is sometimes clamped to prevent contact
with heating components. Install such elements as they were.

(5) After servicing, always check that the removed screws,

components, and wiring have been installed correctly and that
the portion around the serviced part has not been damaged and
so on. Further, check the insulation between the blades of the
attachment plug and accessible conductive parts.

Disconnect the attachment plug from the AC outlet and turn the
power ON. Connect the insulation resistance meter (500V) to the
blades of the attachment plug. The insulation resistance between
each blade of the attachment plug and accessible conductive parts
(see note) should be more than 1 Megohm.

 Accessible conductive parts include metal panels, input

terminals, earphone jacks, etc.

— 7 —

Some semiconductor (solid state) devices can be damaged easily
by static electricity.
Such components commonly are called Electrostatically Sensitive
Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip
components. The following techniques should be used to help reduce
the incidence of component damage caused by static electricity.

(1) Immediately before handling any semiconductor component or

semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed for
potential shock reasons prior to applying power to the unit under
test.

(2) After removing an electrical assembly equipped with ESD

devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.

(3) Use only a grounded-tip soldering iron to solder or unsolder

ESD devices.

(4) Use only an anti-static solder removal devices. Some solder

removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ESD devices.

(5) Do not use freon-propelled chemicals. These can generate

electrical charges sufficient to damage ESD devices.

(6) Do not remove a replacement ESD device from its protective

package until immediately before your are ready to install it.
(Most replacement ESD devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil
or comparable conductive materials).

(7) Immediately before removing the protective materials from the

leads of a replacement ESD device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.

 Be sure no power is applied to the chassis or circuit,

and observe all other safety precautions.

(8) Minimize bodily motions when handling unpackaged

replacement ESD devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of
your foot from a carpeted floor can generate static electricity
sufficient to damage an ESD device).

— 8 —

The laser diode in the optical pick up may suffer electrostatic
breakdown because of potential static electricity from clothing and
your body.

The following method is recommended.
(1) Place a conductive sheet on the work bench (The black sheet

used for wrapping repair parts.)

(2) Place the set on the conductive sheet so that the chassis is

grounded to the sheet.

(3) Place your hands on the conductive sheet (This gives them the

same ground as the sheet.)

(4) Remove the optical pick up block

(5) Perform work on top of the conductive sheet. Be careful not to

let your clothes or any other static sources to touch the unit.

◆ Be sure to put on a wrist strap grounded to the sheet.
◆ Be sure to lay a conductive sheet made of copper etc. Which is

grounded to the table.

Fig.3

(6) Short the short terminal on the PCB, which is inside the Pick-

Up ASS’Y, before replacing the Pick-Up. (The short terminal is
shorted when the Pick-Up Ass’y is being lifted or moved.)

(7) After replacing the Pick-up, open the short terminal on the PCB.

THE UNIT

WRIST-STRAP
FOR GROUNDING

1M

1M

CONDUCTIVE SHEET