Sony SEQ-411 Service Manual

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| q 4 1 1 ~- MODEL IDENTIFICATION —
, . | | | ( Specification Label )
'SONY.
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.
MODEL NO, SEQ-411
| US Model
Canadian Model!
AEP Model
UK Model
E Model
GRAPHIC EQUALIZER
LLM
LEAKAGE TEST
SPECIFICATIONS
Inputs LINE IN: Phono jacks, 245 mV (—10 dBs),
50 kohms
TAPE IN: Phono jacks, 245 mV (-10 dBs),
50 kohms
Outputs LINE OUT: Phono jacks,
245 mV (-10 dBs),
Load impedance: more than 10 kohms
TAPE REC OUT: Phono jacks,
245 mV (-10 dBs),
Load impedance: more than 10 kohms
Graphic equalizer
Boost/cut range: +10 dB
Center frequencies: 60 Hz, 150 Hz,
400 Hz, 1 KHz, 2.4 KHz, 6 kHz, 14 kHz
Frequency response (with EQUALIZATION on)
LINE IN: 20 Hz to 40 kHz *?5dB
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 dB (A network,
1 V output)
Power requirements
U.S.A. model: 120 V AC, 60 Hz
U.K. model: 240 V AC, 50/60 Hz
Australian model: 240 V AC, 50/60 Hz
Power consumption
5 W
AC outlet U.S.A. model:
1 unswitched, 120 W max.
U.K. model:
1 unswitched, 100 W max.
Approx. 430 x 80 x 265 mm (w/h/d)
. — (17x 3's, x O'/2 inches)
Weight Approx. 2.5 kg (5 Ib180z)
Accessories supplied
Audio connecting cord (2)
Dimensions
Design and specifications subject to change without notice.
This appliance conforms with EEC Directive 87/308/EEC
regarding interference suppression.
SAFETY-RELATED COMPONENT WARNING!!
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 MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.
GRAPHIC EQUALIZER
Australian Model
US, Canadian model: AC120V 60Hz 5W
AEP, Germany model: AC220-230V~50/60Hz 5W
UK, Australian model: AC240V~50/60Hz 5W
E model: AC110-120/220-240V~50/60Hz 5W
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 (S00 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-
ments.
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 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}
—— Earth Ground
Using an AC voltmeter to check AC leakage.
MICROFILM
ONY