Technics RST 22 Service Manual

Page 1

DER N0. HADB704096C9

ervice Me: .ual

D lb B C NR E _ d Cassette Deck
0 y - - qUIPPe

Double Cassette Deck RS'T22
Dti- color

(K)..,Black Type
(S)...Si|ver Type

Color Areas

(K) (3) Continental
Europe.

(K) (3) United Kingdom.

(K) (S) ...Hol|and.

(K) (S) ...F.R. Germany.

(K) (S) [XA] ....... Asia, Latin
America, Middle
Near East, Africa
and Oceania.

(K) (S) Australia.
(K) Far East PX.
(K) . European Military.
(K) [XB] . ...Saudi Alabia.
SPECIFICATIONS
l CASSETTE DECK SECTION Wow and tlutter 0.08% (WRMS)
Fast Forward and Rewind Time
Deck system Stereo cassette deck Approx. 105 seconds with 0760 cassette tape
Track system 4-rrack, z-channel Input sensitivity and impedance
Heads LINE 60mV/47 k0
(DECK A)REC/PLAV Solid Permaloy head Output voltage and impedance
Erasing Double-gap ferrite head LINE 400 rnV/S.2 k0
(DECK B)PLAY Solid Permaloy head HEADPHONES BO rnV/B Q
Motors
(DECK A) Capslan/reel table drive I GENERAL
2 speed electronically controlled DC motor ,
(DECK B) Capsian/reel table drive PM °°"s"'""°" 18W
2 speed electronically controlled DC motor Power supply
, . For Australia AC 50 Hz/fil H z, 240V
Recordlng system AC blas F t | E AC H /6 220V
Bias trequency 80 kHz or con men a urope 50 z ) Hz.
Erasing system AC erase . For'others AC 50 Hz/60 Hz, 110V/127Vfl20V/240V
Tapespeed 4.8 cm/sec. (1-7/8 ips) Dlmensmns (WXHXD) 430 X 120>< 228 mm
Weight (16-15/16" X 443/32" > 5-31/32)
Frequency response (w/o Dolby N.R.) 3 8 8 4 lb
METAL 20 Hz~le kHz (:15 dB) - *9 ( >
so Hz~15 kHz (DIN) 095
0,02 20 HIE; kHz (:15 dB) Specifications are subject to change without notice
30 Hz~15 kHz (DIN) Weight and dimensions are approximate.
NORMAL 20 H2~15 kHz (:15 dB)
30 Hz~v15 kHz (DIN) * Dolby noise reduction manufactured under license from
S/N (signal level = max recording level, Grog type tape) Dolby Laboratories Licensing Corporation.
Dolby C NR on 74 dB (CCIR) Dolby and the double-D symbol are trade marks if Dolby
Dolby B NR on 66 dB (CCIR) Laboratories Licensing Corporation.
NR 0 56 dB (A weighted)

. Panlsonlc Tally 0 "Ice
ec I I 108 Matsushila Electric Trading Co., Ltd. Matsushlla Electric ndmg Co.. Ltd.
Po. Box 238, Cenlral Osaka Jaoan 5m Floor, World Trade Cary aide,
No. 44, Hamamaxsu-cnc Zaharne. Mlnato~ku,
Tokyo 105, Japan

Page 2

I CONTENTS

Page
a Location of Controls .................................................. 2
0 Operation 3, 4

- Disassembly Instructions.. . 5
0 Measurement and Adjustment Methodes.. 6~8
- Microcomputer Terminal Function

and Waveform ............................................. 9~11
c Terminal Guide of ICs Transistors

and Diodes.. .................. 11

I LOCATION OF CONTROLS

Headphones jack (phones)

Power standby d), on switch

(power standby (b, on)

This switch turns on and pit the secondary circuit power only.
The unit is in the standby condition when this switch is set
to the standby (b " position. Regardless of the switch setting.
the primary circuit is always live" as long as the power cord is
connected to an electrical outlet.

Tape-select indicators (Auto Tape Select)
The tape selector setting changes automatically, and
the indicator indicates the type of tape being used in
DECK A.
DECK A counterlreset button
(DECK A counterlreset)
This indicates the amount at tape travel of
DECK A", When this button is pressed,
the readout will be reset to "000".

Sim W cum. on as we
man/mum DEC -

0 Wiring Connection Diagram .........
- Resistors and Capacitors
- Electrical Parts List...
0 Printed Circuit Board.
0 Schematic Diagram.
0 Block Diagram ..........
- Mechanical Parts Location.
- Cabinet Parts Location ........................

Level meters (peak level)
During recording, these meters and digital display indicate
the recording level. The level is adjusted by using the record-
ing level control. During playback, they indicate the level of
the recorded sound. Note that the digital display holds the
maximum level ior about 2 seconds.

Recording level
control
(rec level)

Editing tape-speed selector
(editing speed)

Editing/auto space switch
(editinglauto space)

Dolby noise-

reduction
Recording indicator switches
(rec indicator) (Dolby NR)

@DQ

©CJ©

When using DECK A
Record button (rec-[Ii I O)
Playback button (play-El I>)

Rewind button (rewl<<)
Fast-torward button (it/PP)
Stop/eject button (stoplejectlllé)

Pause button (pauselll)

Cassette holder

When using DECK B

Pause button (pause/ll)

Stop/eject button (stopleiect/Ile)
Press this button to stop the tape during
recording or playback, and to open the
cassette holder,

Fast-forwardlcue button (tilcuel>>)
Rewind/review button (rewlrevl44)

Playback button (play-El lb)
Cassette holder