Technics RS 641 Service Manual

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ORDER NO. ARD-7809065C

ervice Manual

Cassette Deck

RS-641

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

pn-

RS-631 MECHANISM SERIES

Specifications (Catalog specifications for sales)

Power requirement: AC; 110/125/220/240V, 50/60 Hz
Power consumption 30W (for European areas and Australia)
11W (tor PX and other area without European

areas and Australia)

Motor: FG servo DC motor
Track system: 4-track 2-channel stereo recording and playback
Tape speed: 48 cm/s, (1-7/8ips)

Wow and flutter 0.05% (WRMS), 015% (DIN)

Frequency response CrOz/FeCr tape; 25~16,000Hz
3O~15,OOOH2 (DIN)
40~14,000Hz i3dB

Normal tape; 25~14,000Hz
30~13,OOOH2 (DIN)
40~12,000Hz :3dB

Signalrto-noise ratio: Dolby*NR in; 67 dB (above 5kHz)

Dolby NR out; 57dB
(signa|:max. recording level,
FeCr/Cr02 type tape)

Fast forward and »

rewind time: Approx 90 seconds with 060 cassette tape
Specifications are subject to change without notice

Rec/pl) connection:

Bias frequency

MIC; sensitiwty 0.25mV, input impedance 10 KS2,
applicable microphone impedance 4OOQ~ 20 K52

LINE; sensitivity 60 mV, input impedance 33 K82

LINE, output level 420mV, output impedance
1K9 or less load impedance 47 K52 over

HEADPHONE; output level 60 mV. load
impedance 89

SP DIN type; input sensitivity Ov26mV, impedance
1 5 K9, output level 420 mV, impedance 10 K0

83 kHz

2-head system

t-HPF head for record/playback

1~doubl~gap ferrite head for erasure

43 Ocm(W)X14.9cm(H)><26.7cm(D)

[17"(w) X5-7/8(H)><1071/2(D)l
tor all of areas without PX

15'8cm(H) X46.6cm(W) X267 cm(D)

i6»1/2"(H)><18-3/8"(W)><10-1/2"(D)] ior PX

76 kg for European areas

7.8kg (16 lbs 5 oz) for other area without
European areas

9kg (19le 14 oz) for PX

Dolby and the doublevD symbol are trademarks of Dolby Laboratories

Technics

Matsushita Electric Trading 00., Ltd.

PO. Box 288, Central Osaka Japan

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® Power switch

® Music selector

® Headphones jack

@ Cassette compartment door
© Tape counter and reset button
© Memory indication lamp

(D Memory switch

Recording indication lamp
@ Fluorescent level meters

® Meter brightness switch

® Bias adjustment control

® Pause button

@ Record button

(4) Playback button

(5) ReWind/review button

LOCATION OF CONTROLS
AND COMPONENTS

r W
\8) K94

Fig. 'I

69 Fast forward/cue button

@ Stop button

ii) Eject button

{9 Timer stand-by button

® PeaksignaI-check switch

@ Dolby noiserreduction switch
@ Bias selector

(3) Equalization selector

® Output level control

23) Line input level controls

® Microphone level controls
@ Microphone jacks

@ Line output jacks

@ Record/ playback connection socket
® Line input jacks