HI-FI SVL-478, SVL-677HF, SVL-678HF, SVL-688HF, SVL-47 Service Manual

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SLV-478/677HF/678HF/688HF/L47/L48/L57/

L58/L67HF/L68HF/L77HF/L78HF/X50/X60HF

RMT-V230/V231/V231A/V231B/V232

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SERVICE MANUAL

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• Refer to the SERVICE MANUAL of VHS MECHANICAL
ADJUSTMENT
921-647-11)

HiFi model: SLV-677HF/678HF/688HF/L67HF/L68HF/L77HF/L78HF/X60HF
Mono model:SLV-478/L47/L48/L57/L58/X50

for MECHANICAL ADJUSTMENTS. (9-

Photo : SLV-478

SPECIFICATIONS

US Model

SLV-677HF/678HF/688HF

Canadian Model

SLV-478/677HF/678HF

Mexican Model

SLV-L47/L57/L67HF/L77HF/X50/X60HF

Panamanian Model

SLV-L47/L58/L67HF/L78HF

Venezueran Model

SLV-L48/L58/L68HF/L78HF

S MECHANISM

TEL [phone] QQ 376315150 892498299

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13942296513

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MICROFILM

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VIDEO CASSETTE RECORDER

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DIFFERENT SPECIFICATIONS

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MODEL

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SPECIFICATIONS

AUDIO SYSTEM
TUNER AUDIO
(STEREO) SYSTEM
VCR+ SYSTEM
LINE 2 INPUT
BODY COLOR
DUAL MODE SHUTTLE
REMOTE COMMANDER

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SLV-478

MONAURAL

—

—
—

BLACK

—

RMT-V231A

1

3

5

SLV-677HF SLV-678HF

HiFi-STEREO

SAP

—
—

TITAN BLACK

—

RMT-V231A

1

5

0

SLV-688HF

HiFi-STEREO

SAP

BUILT-IN
BUILT-IN

BLACK

—

RMT-V231B

8

SLV-L47 SLV-L48

MONAURAL

RMT-V230

9

—

—
—

BLACK

—

2

4

SLV-L57 SLV-L58

9

MONAURAL

BUILT-IN

BLACK

BUILT-IN

RMT-V232

8

—

—

2

9

9

MODEL

SPECIFICATIONS

TEL [phone] QQ 376315150 892498299

AUDIO SYSTEM
TUNER AUDIO
(STEREO) SYSTEM
VCR+ SYSTEM
LINE 2 INPUT
BODY COLOR
DUAL MODE SHUTTLE
REMOTE COMMANDER

TEL

13942296513

SLV-L67HF SLV-L68HF

HiFi-STEREO

SAP

—
—

BLACK TITAN

—

RMT-V231

SLV-L77HF SLV-L78HF

HiFi-STEREO

SAP

—

BUILT-IN

BLACK TITAN

BUILT-IN

RMT-V232

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SLV-X50

MONAURAL

TITAN

BUILT-IN

RMT-V232

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3

—

—
—

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3

SLV-X60HF

HiFi-STEREO

TITAN

RMT-V231

5

1

SAP

—
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—

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SAFETY-RELATED COMPONENT W ARNING!!

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

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COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.

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ATTENTION AU COMPOSANT AYANT RAPPORT

LES COMPOSANTS IDENTIFÉS P AR UNE MARQ UE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY

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DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

3

À LA SÉCURITÉ!

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SAFETY CHECK-OUT

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1. Check the area of your repair for unsoldered or poorly-soldered

connections. Check the entire board surface for solder splashes
and bridges.

2. Check the interboard wiring to ensure that no wires are

"pinched" or contact high-wattage resistors.

3. Look for unauthorized replacement parts, particularly

transistors, that were installed during a previous repair . Point
them out to the customer and recommend their replacement.

4. Look for parts which, though functioning, show obvious signs

of deterioration. Point them out to the customer and
recommend their replacement.

5. Check the line cord for cracks and abrasion.

Recommend the replacement of any such line cord to the
customer.

6. Check the B+ voltage to see it is at the values specified.

7. Check the antenna terminals, metal trim, "metallized" knobs,

screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

6

T o Exposed Metal

Parts on Set

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After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.

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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

2. A battery-operated A C milliammeter. The Data Precision 245

3. Measuring the voltage drop across a resistor by means of a

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TW-540A. F ollow the manufacturers' instructions to use these
instruments.

digital multimeter is suitable for this job.

VOM or battery-operated AC v oltmeter . The "limit" indication
is 0.75V, so analog meters must have an accurate low v oltage
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 A C range are suitable. (See
Fig. A)

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13942296513

0.15

µ

F

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

1.5 k

Ω

Earth Ground

AC
Voltmeter
(0.75 V)

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