Technics RS 631 Service Manual

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ORDER NO. ARD-78020110

Service Manual

Cassette Deck

RS-631

Front-Loading Vertical Hold High Fidelity Stereo
Cassette Deck with Memory Auto Play and Separate
3-Position Bias/ Equalization Selectors

RS-631 MECHANISM SERIES

Specifications (Catalog specifications for sales)

Power requirement

Motor,

Track system.

Tape speed:

Wow and llutter
Frequency response:

Signaleto-nOis ratio

Fast forward and
rewind time:

AC,110/125/220/240V,50/60Hz
Power consumption; 13W

PG servo DC motor

4-track Zechannel stereo recording and playback
4.8cm/s

0.06% (WRMS), i0.15% (DlN)
CrO2/FeCr tape; 25~16,000Hz
3O~15,OOOHZ (DIN)
40~14,OOOH2 i3dB
25~14.OOOH2
30~13.000HZ (DlN)
40~12,000Hz i3dB
Dolby NR in; 67 dB (above 5kHz)

Normal tape;

Dolby NR out; 57 dB (signal level :max record-

ing level, CrOz/FeCr tape)

Approx. 90 seconds with 060 cassette tape

Input

Output :

Rec/pp connection
Head:

Dimensions:
Weight:

MIC; sensitivity 0.25mV, applicable microphone
impedance 400§2~ 20 K9

LINE; sensitivity 60 mV, input impedance 33 K9

DlN; sensitivity 0.26 mV, input impedance 1 5K9

LINE; output level 420mv, load impedance
47 KS2 over

DIN. output level 420 mV, output impedance
10 K9 over

HEADPHONE ; output level 60 mV, load Impedance
89

5 P DlN type

27head system

l-HPF head for record/ playback

l-doublegap ferrite head for erasure

43.0 cm (W) X 149 cm(H) X 26.7 cm (D)

7 6 kg

Specifications are subject lo change without notice,

Matsushita Electric Trading 00., Ltd.
PO. Box 288, Central Osaka Japan

I'Ibchnics

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2 C3)

6) Power switch

(2) Headphones jack

® Cassette compartment door
® Tape counter and reset button
(5) Memory indication lamp

© Memory sWitch

6) Recording indication lamp
® Pause button

(9 Record button

GD Playback button

® Rewind/review button

69 Fast forward/cue button

® Stop button

® Eject button

Fig. 1

LOCATION OF CONTROLS
AND COMPONENTS
GD @ (6)

®

® Timer standby button

is) Peak-signal-check switch

@ Dolby noise-reduction switch
Bias selector

® Equalization selector

@ Output level control

@ Line input level controls

(22) Peak level/VU meters

® Microphone level controls
@ Microphone Jacks

® Line output jacks

(E Record/ playback connection socket
@ Line input jacks