Sony CDP-70 User Manual

~ CDP-770 |
TABLE OF CONTENTS
Section Title
SECTION 1 GENERAL
1-1. Location of Controls ................ 220 e eens
SECTION 2 ELECTRICAL ADJUSTMENTS ............
SECTION 3 DIAGRAMS
3-1. Semiconductor Lead Layouts ..................
3-2. Printed wiring Boards.................-02. eee
3-3. Schematic Diagram ........... 0... c cess eee eee
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following 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 chassis, must
not exceed 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A._ Follow the
manufacturers’ instructions to use these instru-
ments.
to
A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
e
iy
Section Title
3-4. Explanation of IC601 (MSC6458-36SS) ..........
3-4-1... Pin: Descriptions biases iG ee dias ogee ee
3-5. IC Block Diagrams ............... 0. cece eee eee
SECTION 4 EXPLODED VIEWS
A-\:. Main Block ics csa3 cae een es Cte Pad MAAS
4-2. Optical Pick-Up Block ..................0.000.
11 | SECTION 5 ELECTRICAL PARTS LIST ................
3.
Measuring
the
voltage
drop
across
a
resistor
by
means
of
a
VOM
or
battery-operated
AC
volt-
meter.
The
“‘limit”
indication
is
0.75
V,
so
analog
meters
must
have
an
accurate
low-
voltage
scale.
The
Simpson
250
and
Sanwa
SH-63Trd
are
examples
of
a
passive
VOM
that
is
suitable.
Nearly
all
battery
operated
digital
multimeters
that
have
a
2V
AC
range
are
suitable.
(See
Fig.
A}
To Exposed Metal
Parts on Set
|
AC
voltmeter
(0.75 V)
0.15uF T 1.542
= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SERVICING NOTE
NOTES ON HANDLING THE OPTICAL PICK-
UP BLOCK OR BASE UNIT
The
laser
diode
in
the
optical
pick-up
block
may
suffer
electrostatic
breakdown
because
of
the
poten-
tial
difference
generated
by
the
charged
electrostatic
load,
etc.
on
clothing
and
the
human
body.
During
repair,
pay
attention
to
electrostatic
break-
down
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.
CAUTION
Use of controls or adjustments or performance
of procedures other than those specified herein
may result in hazardous radiation exposure.
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 check-
ing the laser diode emission, observe from more than 30
cm away from the objective lens.
—2—

Sony CDP-70 Specifications

General

Brand	Sony
Model	CDP-70
Category	CD Player
Language	English