Sansui D 79 C Service Manual

Page 1

7 0-790

SERVICE MANUAL -SlECIFlCATIONS

Track .............................. 4-Track (2-Channei Stereo)
Tape Speed ..................... 4,8 cm/sec. (1-7/8 ips)
Heads (2-head configuration)

STEREO CASSETTE DECK Eéifieliiiwm"11::1 Séculfiéfiiifliéma°y

Motor ............................. Capstan: Electronically
Controlled DC Motor
SANSUI 0-790
Wow and flutter within 0.05% WRMS
- Fast wind time ................ a roximatel 80 seconds
(Silver 8. Black Model) (520) y
Frequency response (-20 VU recording/playback)
Normal Tape (LH) ....... 20 to 15,000 Hz
(30 to 14,000 Hz :i:3 dB)
Chrome tape .............. 20 to 17,000 Hz
(30 to 16,000 HZ 5:3 dB)
Metal Tape ................. 20 to 18,000 Hz

(30 to 17,000 Hz i=3 dB)
Signal to noise ratio (Record/Playback)
Metal Tape (without Dolby Noise Reduction Effect)
.................................. better than 58 dB (weighted)
(With Dolby Noise Reduction) B
.................................. better than 68 dB
(above 5 kHz)
(With Dolby Noise Reduction) C
.................................. better than 78 dB
(above 1 kHz)
Erasure factor (Metal Tape)
.................................. more than 72 dB at 1 kHz
Input sensitivity and impedance (0 VU, 1 kHz)

MIC ........................... 0.3 mV/2000~5 k0
LINE IN (REC) ............. 150 mV/47 k0
Output level (0 VU, 1 kHz)
CAUT!ON _ . _ LINE OUT (PLAY) ....... 225 mV
1. Parts Identified by the Asymbol on the schematic Power requirements
diagram and the parts list are critical for safety. P°Fiifbv§liaiiaegggafi20mm V (50/60 HZ)
Use only replacement parts that have critical charac- ........... ................. 120 v (60 Hz)
teristics recommended by the manufacturer. . Powerconsumption....15 W a
2. Make leakage-current or resistance measurements D'memw -------------------- fig m 816]} [553) )HW
to determine that exposed parts are acceptably in- 223 mm (3.1 3/15) D
sulated from the supply Circwt before returning the Weight ............................ 3.6 kg (7.9 lbs.) net
appliance to the customer. 4-4 kg (9-7 'st Packed
' Design and specifications subject to changes without notice for im-

movements.

Noise reduction system manufactured under license from Dolby laborato-
ries Licensing Corporation.
Dolby and the double D symbol are trade marks of Dolby laboratories
licensing Corporation.

Sansuj.
SANSUI ELECTRIC CO., LTD.

Page 2

D-7QC

CAUTION

1. The symbols, UL, CSA, SA, BS, UK, EU, AS and XX (EXPORT) on
the parts list and the schematic diagram mean followings respectively.

UL ....................... Manufactured for U.S.A market.
(Underwriters Laboratories approved model.)

CSA .................... Manufactured for Canadian market.

SA ....................... Manufactured for South African market.

BS, UK ............... Manufactured for United Kingdom market.

EU ...................... Manufactured for European market.

AS ....................... Manufactured for Australian market.

XX (EXPORT) ..... Standard Version.

NON MARK ........ Common Parts.

2. Some printed circuit boards are not supplied as the assembled.
To separate these in this service manual, the stock Nos are not in-
dicated at the ends of the board names. However, the individual parts
on the circuit boards are provided by orders.

3. Since some of capacitors and resistors are omitted from parts lists
in this service manual, refer to the Common Parts List for capacitors
& resistors, which was issued on February 1983.

4. Abbreviations in this service manual are as follows.

C.R.
S.R.
CeR.
MR.
F.Ft.
N.I.Ft.
A.R.
CC.
C.T.

E.C.
E.L.

E.B.

* OAbbreviations List

: Carbon Resistor

: Solid Resistor

: Cement Resistor

: Metal Film Resistor

: Fusing Resistor

: Non-inflammable Resistor
: Array Resistor

: Ceramic Capacitor

: Ceramic Capacitor,

Temoerature Compensation

: Electrolytic Capacitor
: Low Leak Electrolytic

Capacitor

: Bi-Polar Electrolytic

Capacitor

E.B.L.

Ta,C.
F.C_
M.P.
P.C.
G.C.
A.C.
V.R.
S.V.R.
SW.
Chip R. :
Chip C. :

2 Low Leak Bi-Polar

Electrolytic Capacitor

: Tantalum Capacitor

: Film Capacitor

: Metalized Paper Capacitor
: Polystyrene Capacitor

: Gimmic Capacitor

: Array Capacitor

: Variable Resistor

: Semi Variable Resistor

: Switch

Chip Resistor
Chip Capacitor