Sony seq 411 service manual

Page 1

SEQ-41 I

SERVICE MANUAL

US Model
Canadian Model
AEP Model

UK Model

E Model
Australian Model

SPECIFICATIONS

lnpuls LINE IN: Phono tacks, 245 mV (-10 CBS),
50 kohms
TAPE IN: Phono tacks. 245 mV (-10 (185).
50 kohms

Outputs LINE OUT: Phone jacks.

245 mv (710 dBS),
Load Impedance: more than 10 kohms
TAPE REC OUT: Phone Jacks,
245 mV (-10 st),
Load Impedance: more than to kohrns
Graphic equalizer
Boost/cut range :10 dB
Center trequencles: 60 Hz, 150 Hz,
400 HZ,1 kHz 2 4 kHz, 6 kHZ,14 kHz
Frequency response (wnn EQUALIZATION on)
LINE IN, 20 Hz to 40 kHz II'LdB
Harmonic distortIon
LINE IN' Less than 0.008% (at 1 kHz,
1 V output)
Signal-to-nOIse ratio (WIth EQUALIZATION on)
LINE IN Better than 100 08 (A network
I V output)

Power requIrementS
U S A model: 120 V AC, 60 HZ
U.K. model: 240 V AC. 50/60 Hz
Australlan model: 240 V AC. 50/60 Hz
Power consumption
5 W
AC outlet USA, model,
I unSWItched, 120 W max.
U K model:
1 unswitched, 100 W max
Dimensions Approx. 430 x 80 x 265 mm (w/h/d)
(17 x 3% X 917 Inches)
Weight Approx. 25 kg (5 lblsoz)
Accessories supplied
Audio connecting cord (2)

DeSIgn and Specifications subtect to change without notIce,

ThIS apphance contormS with EEC Directive 87l308lEEC
regardIng lnterterence suppreSSIon.

SAFETY

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A 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 PUB-
LISHED BY SONY.

ATTENTION Au COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE 1?;
sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER css com,
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS som DONNES DANS CE MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

GRAPHIC EllUALIZER
SONY;

Page 2

- MODEL IDENTIFICATION -

( Spec/fine tion Label )

SONYs

MODEL NO. SEQ-411

GRAPHIC EQUALIZER

US, Canadian model:
AEP, Germany model:
UK, Australian model:
E model:

AClZOV 60Hz 5w
ACZZU-230V~50/60HZ 5W
ACZ40V~50/60Hz 5W
ACll0-120/220-240V~50/60H2 5W

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 0.5 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 instru<
mentsi

2i 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 meter. The limit indication is 0475 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 3 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Parts on Set

AC
015w 1,5 kit voltmeter
(0. 75 V}

'.__l

"7" Earth Ground

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