Sony ta e 90es pre service manual

Page 2

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- MODEL IDENTIFICATION -
(Specification Label)

SONY MODEL NO. TA-E90ES

4971 -m

AEP model : 660-XX
German model : 661-xx
US model : 662-xx

TABLE OF CONTENTS

§§g§i9n Title Page
1. SERVICING NOTE .................................................. a
2. GENERAL ............................................................... 4

3. ELECTRICAL ADJUSTMENTS ..

4. DIAGRAMS
4-1. Circuit Boards Location ...........................................
4-2. Block Diagram ...................................
4-3. Printed Wiring Board - Main Section
4-4. Schematic Diagram - Main Section -
4-5. Semiconductor Lead Layouts ...........
4'6. Primed Wiring Board - Control Section
4-7. Schematic Diagram - Control Section - 23
4-8. lC Pin Function ..........................................

5. EXPLODED VIEWS

5-1. Front and Side Panel Section
5-2. Rear Panel Section .
5-3. Boards Section

6. ELECTRICAL PARTS LIST ..................................... 29

SAFETY CHECK-OUT

After correcting the original service problem, perform the
following safety checks 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

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 0.5
mA (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-540A. Follow the manufacturers'
instructions to use these instruments,

2, A batteryeoperated 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
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

0.15uF §15k9 voltmeter
. I (0.75V)

'-' Earth Ground

Fig. A, Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNING Il

COMPONENTS IDENTIFIED BY MARK A OR DOTTED

LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE OP-

ERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

NOTE FOR INSTALLATION OF THE SIDE PANEL

SIDE PANEL

SECTION 1
SERVICING NOTE

Adjust the aperture to be about 5 mm from the FRONT PANEL when
installing the SIDE PANEL.

G)

0

Approx. 5mm
.__

FLAT HEAD SCREW
(M3 x 8)