Sansui RX 255 Service Manual

Page 1

1 lSERVICE MANUALl

SANSUI

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QUARTZ PLL SYNTHESIZER as W, , ,2 I, 3 ,1 4 , "W11;
CASSETTE RECEIVER

OSPECIFICATIONS
Audio section Tuner section
Maximum output power 8 watts per channel into (FM)
4 ohms (1 kHz, 10% total Tuning range ................ 88 to 107.9 MHz
harmonic distortion) Usable sensitivity
Rated output power ........ 4 watts per channel into Mono IHF .................. 14.8 dBf (1.5 uV/75 ohms)
4 ohms (1 kHz, 1% total 50 dB quieting sensitivity
harmonic distortion) Stereo ......... 18.4 dBf
Load impedance .............. 4 ohms Signal to noise ratio (at 65 dBf)
Output voltage Stereo/mono ............... 65 dB/70 dB
PRE-OUT .................... 500 mV/10 kohms Frequency response (PREOUT)
Signal to noise ratio (A network) .................................. 30 to 15,000 HZi3 dB
.................................. 80 dB (AM)
Controls Tuning range ................... 530 to 1,600 kHz
BASS/TREBLE .............. :i: 10 dB at 100 Hz/10 kHz Usable sensitivity ............ 30 dB/uV
AUTO LOUDNESS ...... +6 dB at 100 Hz (75 ohms at 1,000 kHz)
+2 dB at 8 kHz General
(VOLUME: "30dBl Power requirements ........ DC 12.0V/Rated: 14.4V

(Usable: 10.8~15.6V)

Tape SQCtIOD negative ground

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

Current consumption ...... 2A Maximum
Tape speed ....... 4.8 cm/sec. Dimensions (Wx H X D)
Play back head Hard permalloy, 4-track Chassis size ................ 17BX50><184 mm
Wow/flutter .................... 0.12% max. (WRMS) (7-l/l6 X 2 X 74/4»,
Frequency response Nosepiece .................. 104><42>< 34 mm
Normal (LH) tape ....... 30 to 14,000 Hzi3 dB (4.1/8 x1-11/16><1-3/8)
Metal tape .................. 30 to 15,000 Hzi3 dB Front trim panel ......... 190x60 mm
Signal-to-noise ratio (with metal tape, A network) (74/20 x 23/8)
-------------------------------- Better than 55 d3 Weight 1.35 kg (2.97 lbs) net

Design and specifications subject to changes without notice for im-
provements.

Page 2

RX-255

CAUTION

1. Do Not Use Endless Tapes

If an endless tape is used with this unit, the tape will
not be wound up properly inside the cassette shell
and, as a result, it will not be possible to use it again.
Also, this unit cannot eject a tape which has been
inserted with its reverse side facing up.

(At this case, refer to How to hook out the endless
tapes.)

2. Some printed circuit boards are not supplied assem-
bled. To separate these in this service manual, the
stock numbers are not indicated for these boards.
However, stock numbers for individual parts are in-
dicated.

3. 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 June 1987.

4. 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.|.R. : 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-F'olar
Electrolytic Capacitor

Ta.C. : Tantalum Capacitor

F.C. : Film Capacitor

M.P. : Metalized Paper Capacitor

P.C. : Polystyrene Capacitor

G.C. : Gimmic Capacitor

A.C. : Array Capacitor

V.R. : Variable Resistor

S.V.R. :Semi Variable Resistor

SW. : Switch

Chip R. : Chip Resistor

Chip C. : Chip Capacitor

5. For an operation of cassette mechanism, refer to the
RX-350 Service Manual.

HOW TO HOOK OUT THE
ENDLESS TAPES

1) Require the plate as Fig. 1.
2) Hook the hole of endless tape out of cassette pocket as Fig. 2
and 3 while pushing the FF and REW knobs.

Fig. 1 //,3\
a d A

Fig. 3

|\Endless Tape
Hole of Reel Hub
The Plate

@-