Technics RSTR 272 Service Manual

Page 1

AR-2 MECHANISM SERIES
Specifications (IHF '78)

I Cassette Deck Section
Deck system
Track system

Stereo cassette deck
4-track, 2-channel

Recording system AC bias
Bias frequency 80 kHz(approx.)
Erasing system AC erase
Heads
Deck 1 Playback head(Permalloy) X 1
Deck 2 Recording/Playback head(Permalloy) X 1
Erasing head(Double-gap ferrite) X 1
Motors
Deck 1 Capstan/Reel table drive(DC servo motor) X 1
Deck 2 CapstarVFteel table drive(DC servo motor) X 1
Tape speed 4.8 cm/secc(1-7/8 ips)
Wow and flutter 0.18%(WRMS)

Fast forward and rewind times
Approx. 120 seconds with C-60 cassette tape
Frequency response(Do|by NR off)

TYPE I (NORMAL) 4o Hz-14 kHz, :3 dB

20 HZ-17 kHz
TYPE ll (HIGH POSITION) 40 Hz-14 kHz. :3 dB
20 Hz-17 kHz
TYPE III (METAL) 40 Hz-15 kHz, :3 dB
20 Hz- 18 kHz

Technics®

ORDER NO. MD970707303

Service Manual

Stereo Cassette Deck

3):
on-

Cassette Deck

RS-TR272

Colour
K ........ Bl kT
Area () ac ype
Suffixior
Model No. Area Colour

Asia, Latin America,
(G0) Africa and Middle
Near East

(G N) Oceania
(GT) Taiwan

(K)

* olby noise reduction and HX PFIO headroom extension
m nufactu red underlicense from Dolby Laboratories Licensing
'C rporation.
§ lby", the double-D symbol and "HX PRO"are trademarks of
by Laboratories Licensing Corporation.

SIN (signal level = max recording level, TYPE H type tape)

NR off 54 dB (A weighted)
Dolby B NR on 64 dB (A weighted)
Dolby C NR on 72 dB (A weighted)
Input sensitivity and impedence
nEc (IN) 500mV/47 kg
Output voltage and impedence
PLAY (OUT) 500mV/500 Q
I General
Power consumption
For 60, GT 21W
For GN 18W
Power supply
For (30, GT AC 50/60Hz, 110V/127V/220V/230V~240V
For GN AC 50/60Hz, 230V~240V
Dimensions (W X H X D) 430 X 136 X286 mm
Weight 3.8 kg
Notes:

Specifications are subject to change without notice
Weight and dimensions are approximate.

© 1997 Matsushita Electronics (S) Fte, Ltd.
All rights reserved, Unauthorized copying and
distribution iS a violation of law.

Page 2

RS-TR272 J

by anyone else could result in serious injury or death.

A WARNING
This service information is designed forexperienced repairtechnicians only and is not designedfor use bythe general public. It does notcontain warnings
orcautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricityshould be serviced
or repaired only by experienced professional technicians. Any attempt to service or repairthe product or products dealt with in this service information

I Contents

- BEFORE USE ..........
- OPERATION CHECKS
- EEPROM Data Write . 4 ~ 5
0 Adjusted Value Rewrite .......................................................... 6 ~ 8
- MEASUREMENTS AND ADJUSTMENTS. 9 ~11
- TERMINAL FUNCTION OF |C's.... 12

0 WIRING CONNECTION DIAGRAM
' MECHANISM PARTS LOCATION(DECK 1).
' MECHANISM PARTS LOCATION(DECK 2)
- CABINET PARTS LOCATION
- MECHANISM PARTS LIST
- REPLACEMENT PARTS LIST.

0 TERMINAL GUIDE OF ICS. TRANSISTORS & DIODES .. 12 ~ 13 ° RESISTORS & CAPACITORS ........................................... 37 ~ 38
O SCHEMATIC DIAGRAM ..................................................... 13 ~ 21 ' PACKAGING .............................................................................. 39
0 PRINTED CIRCUIT BOARD .............................................. 22 ~ 26

I Before Use (for GC and GT area only)

Be sure to disconnect the mains cord before adjusting the voltage selector.

Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage
setting for the area in which the unit will be used.

(If the power supply in your area is 117V or 120V, set to the "110 -127V" position.)
Note that this unit will be seriously damaged it this setting is not made correctly.

(There is no voltage selector for some countries; the correct voltage is already set.)