Sony TA-E1 Operating Instructions (primary manual) Service Manual

1

TA-E1

SPECIFICATIONS

STEREO PRE AMPLIFIER

SERVICE MANUAL

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

MICROFILM

2

TABLE OF CONTENTS

1. GENERAL ........................................................................... 3

2. ELECTRICAL ADJUSTMENT .................................... 5

3. DIAGRAMS

3-1. Circuit Boards Location ........................................................ 5

3-2. Schematic Diagram – Main Section (1/3) –..........................6

3-3. Schematic Diagram – Main Section (2/3) –..........................7

3-4. Schematic Diagram – Main Section (3/3) –..........................8

3-5. Printed Wiring Board – Main Section –................................ 9

3-6. Schematic Diagram – Power Section –............................... 10

3-7. Printed Wiring Board – Power Section –............................ 11

4. EXPLODED VIEWS

4-1. Top Plate and Back Panel Section....................................... 12

4-2. Front Panel Section ............................................................. 12

4-3. Bottom Plate Section .......................................................... 13

5. ELECTRICAL PARTS LIST ................................... 14

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 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 “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)

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

0.15µF

To Exposed Metal
Parts on Set

1.5k

Ω

AC
voltmeter
(0.75V)

Earth Ground

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK ! OR DO TTED 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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.

MODEL IDENTIFICATION
— BACK PANEL —

PARTS No. MODEL

4-214-526-1π US , CND
4-214-526-2π AEP, UK, E, AUS

Parts No.

• Abbreviation
CND : Canadian model
AUS : Australian model

3

SECTION 1

GENERAL

This section is extracted from
instruction manual.

4

TA-E1

55

SECTION 3
DIAGRAMS

3-1. CIRCUIT BOARDS LOCATION

SECTION 2

ELECTRICAL ADJUSTMENTS

IDLING ADJUSTMENT AND OFFSET VOLTAGE
CHECK

• Perform this adjustment after replacing CP103 and CP104.

• Perform this adjustment more than 10 minutes after supplying
the power.

Connection:

BALANCE OUTPUT LEVEL ADJUSTMENT

• Perform this adjustment when replacing CP102.

• Perform this adjustment after the idling adjustment

Connection:

MAIN board

SW L board

AC J board

LED A board

LED B board

SW P board

PS board

VOL board

THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)

For schematic diagrams.

Note:

• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in Ω and 1/

4

W or less unless otherwise

specified.

• % : indicates tolerance.

• 2 : nonflammable resistor.

• 5 : fusible resistor.

• C : panel designation.

• S : B+ Line.

• T : B– Line.

• H : adjustment for repair.

• Voltages and waveforms are dc with respect to ground in
playback mode.

• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc­tion tolerances.

• Signal path.
F : TUNER

Note:

The components identi­fied by mark ! or dotted
line with mark ! are criti­cal for safety.
Replace only with part
number specified.

Note:

Les composants identifiés par
une marque ! sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.

For printed wiring boards.

Note:

• X : parts extracted from the component side.

•®: Through hole.

• b : Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.

Digital voltmeter

TP501 (L-CH), TP502 (R-CH)
TP503 (L-CH), TP504 (R-CH)

MAIN board

Procedure:

1. Connect the digital voltmeter as shown above.

2. Adjust RV501 (L-CH) and RV502 (R-CH) of the MAIN board
so that the digital voltmeter reads 50 mV ±5 mV. (Idling adjust­ment)

3. Measure the voltage of both terminals of R221 (L-CH) and R222
(R-CH) of the MAIN board, and check that the voltage is within
2 mV.
(Offset voltage check)

Measuring Adjusting Adjusting

Point Point Value

L-CH TP501 to TP503 RV501 50 mV ± 5 mV
R-CH TP502 to TP504 RV502 50 mV ± 5 mV

Measuring Point Specified Value

L-CH Both terminals of R221 Within 2 mV
R-CH Both terminals of R222 Within 2 mV

Procedure:

1. Connect as shown above.

2. Rotate the INPUT SELECTOR knob, and set the input source
to LINE 1 .

3. Set the input level so that the oscilloscope waveform level be­comes approx 3 V.

4. Adjust RV401 (L-CH) and R V402 (R-CH) so that the two wave­form levels on the oscilloscope become equal and their phases
are reversed.

BALANCED-OUT 2 3 pin

LINE1 input

Set

AF OSC

attenuator

Oscilloscope

Adjusting Value:

Adjusting Point Adjusting Value

L-CH Pin 2 (CH1) and RV401

Pin 3 (CH2) of CN203

R-CH Pin 2 (CH1) and RV401

Pin 3 (CH2) of CN203

Phases of waveforms of
Pins

2

and 3 should be reversed

Waveform of
Pin

2

(CH1)

Waveform of
Pin

3

(CH2)

Adjustment Location:

[MAIN board] (Component Side)

OFFSET
VOLTAGE

R222

R221

RV401
BALANCE OUT
LEVEL L CH

RV402
BALANCE OUT
LEVEL R CH

RV501
IDLE
L CH

TP503

RV502
IDLE
R CH

TP501 TP504 TP502

TA-E1

6

6

3-2. SCHEMATIC DIAGRAM – MAIN SECTION (1/3) –

• Refer to page 9 for Printed Wiring Board.

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