Sansui GT X7000 Service Manual

Page 2

GT4X7OOO/X7OOOL X7000F

GT-X7000l.
Audio section
Input sensitivity and impedance (1 kHz)

LINE IN ...................... 120 mV/iO kohms
Output voltage
LINE-OUT .................. 120 mV

PRE-OUT (LOW

.. 500 mV

PRE-OUT (HIGH) ........ 1,000 mV
Controls

BASS .......................... 3:10 dB at 100 Hz

TREBLE ....................... 5:10 dB at 10 kHz

LOUDNESS ................ +8 dB at 100 Hz

+6 dB at 10 kHz
(VOLUME: -30 dB)

Tuner section

(FM)
Tuning range ................... 88 to 108 MHz
Usable sensitivity
Mono lHF .................. _11.2 dBf (1 pV/75 ohms)
50 dB quieting sensitivity
Stereo ........................ 16.2 dBf
Signal to noise ratio (at 65 dBf)
Stereo/mono ............... 65 dB/70 dB

Frequency response (LINE OUT)
.................................. 30 to 15,000 Hz-3 dB

Stereo separation 35 dB at 1 kHz
(MW)
Tuning range ................... 531 to 1,600 kHz

..... 30 dB/uV at 1,000 kHz
........ 45 dB

Usable sensitivity
Signal to noise ratio
(LW)

Tuning range (LW1) ......... 155 to 281 kHz
(LWZ)......... 153 to 279 kHz

Usable sensitivity ............ 35 dB/nV at 225 kHz

Sigrial to noise ratio ........ 45 dB

Tape section

Track format ................... 4-track/2-channel system

Tape speed... ..... 4,8 cm/sec.

Wow/flutter .................... 0.08% max. (WRMS)

Frequency response
Normal (LH) tape ....... 30 to 16,000 Hzaz3 dB

Metal tape .................. 30 to 18,000 Hza:3 dB
Signal-to-noise ratio (with metal tape)
DOLBY NR OFF Better than 58 dB

DOLBY-B NR ON Better than 67 dB
(above 5 kHz)

DOLBY-C NR ON ....... Better than 75 dB
(above 1 kHz)

General

Power requirements ........ DC 12.0V/Rated: 14.4V
(Usable: 10.8~15.6V)
negative ground

Current consumption ...... 500 mA Maximum

Dimensions ..................... 187 mm (7-3/8') W
57 mm (2-1/4) H
188 mm (7-3/8") D

Chassis size ................ 179 mm (7-1/16) W

50 mm (2") H
160 mm (6-5/16) D

Weight (net) .................... 1.6 kg (3.5 lbs)

CAUTION

. The symbols, AS and XX on the parts list and the

schematic diagram mean followings respectively.

AS .................. Manufactured for Australian market.
XX .................. Standard Version.
NON MARK.... Common Parts.

. Some printed circuit boards are not supplied as the

assembled.

To separate these in this service manual, the stock
Nos are not indicated at the ends of the board
names. However, the individual parts on the circuit
boards are provided by orders.

. Since some capacitors and resistors are omitted from

parts lists in this service manual, refer to the Com-
mon Parts List for capacitors & resistors, which was
issued on February 1983.

. Abbreviations in this service manual are as follows.

- oAbbreviations List

C.R. : Carbon Resistor

S.R. : Solid Resistor

Ce.R. : Cement Resistor

M.R. : Metal Film Resistor

F.R. : Fusing Resistor

N.l.Ft. : Non-lnflammable Resistor
A.R. : Array Resistor

C.C. : Ceramic Capacitor
C.T. : Ceramic Capacitor, Temperature
Compensation

E.C. : Electrolytic Capacitor

E.L. : Low Leak Electrolytic Capacitor

E.B. : Bi-Polar Electrolytic Capacitor

E.B.L. : Low Leak Bi-Polar Electrolytic
Capacitor

Ta.C. : Tantalum Capacitor

F.C. : Film Capacitor

MP. 2 Metalized Paper Capacitor

F.C. : Polystyrene Capacitor

G.C. : Gimmic Capacitor

A.C. : Array Capacitor

V.Ft. : Variable Resistor

S.V.R. : Semi Variable Resistor

SW. : Switch

Chip R. : Chip Resistor

Chip 0. : Chip Capacitor

Page 10

X7000IX7000L X7000F

7. PLAY, REW-TFF 8. STOP-*REW

MOTOR+
MOTOR-
F SOL '
R SOL HWL I-I
MUTE l' '
' I
20mm . 0-759 i 05 :2 ACTION COMPLETED
0.1m , $APC DETECTION
8. STOP-REW
MOTOR+
MOTOR- 2
F SOL -I I
R SOL l I
I
MUTE . '
I
10mm . 0-8560 I ° 559° J 3 ACTION COMPLETED
' ' :> APC DETECTION
9. PLAY, FF->REW
MOTOR+
MOTOR-
F SOL L-I
R SOL I, l
MUTE l '
20m866li 073°C _. 0-559 l 3 ACTION COMPLETED
I. I
0.1sec I :APC DETECTION

10. PLAY, FF, REW-rSTOP (KEY OFF)

MOTOR+ I,
MOTOR- I
F SOL I
a SOL .I I
MUTE '

l [0.1sec
ZOM-secu Ink-.1 :> ACTION COMPLETED

0.1sec

tPLAY, FF, REW-tsTOP (KEY OFF)

FF indicates the rolling-up of tape foward the.I FWD side, and REW '1n the first 0.5 sec OfAPC detection, only the return to PLAY in auto-
indicates the rolling-up of tape {award the REV side. matic music selection is enabled, and the return to other modes is
'Each output indicates a logic from control IC, and MUTINC is released disabled.
when MUTE is at H". 'See flowchart about PLAY RETURN MODE by APC detection in FF,
IAPC detects that HEAD is in contact with a tape stably and the detec- REW.

tor circuit is at an operative timingt

ICXA1097Q (Dolby Noise Reduction)

3. INTERIOR BLOCK DIAGRAM OF IC

'BA6251F/L81213M (7 Unit Transistor Array)
OUT1 OUTz OUTa OUT4 OUT5 OUTs OUT7

mmmmmmmfi

lllllllw

LJLEJLEJIillilIilLLIB

IN1 |N2 INS INA |N5 |N6 IN7 GND

OBA3112 (Dual Pre Amp.)

0M54563P (8 Unit Transistor Array)
OI oz 03 04 05 06 07 08 GND

WWWIEIIEIIEIIEIWID
) Hééééi
ii

L'Jléllllflllillfillllwlfl

iNl 1N2 INS IN4 |N5 iN6 IN7 INB Vs