Technics RS-641 Service Manual

ORDER NO. ARD-7809065C
Service Manual
Cassette Deck
RS-641
Front-Loading Vertical Hold High Fidelity Stereo
Cassette Deck with Memory Auto Play and Separate
3-Position Bias/ Equalization Selectors
DC [eater svsrew)
RS-631 MECHANISM SERIES
Specifications (Catalog specifications for sales)
Power requirement: AC; 110/125/220/240V, 50/60 Hz Input:
Power consumption: 30 W (for European areas and Australia)
11W (for PX and other area without European
areas and Australia) Output:
Motor: FG servo DC motor
Track system: 4-track 2-channel stereo recording and playback
Tape speed:
4.8cm/s, (1-7/8 ips.)
Rec/pb connection:
Wow and flutter: 0.05% (WRMS), 0.15% (DIN)
Frequency response: CrO2/FeCr tape: 25~ 16,000Hz
Bias frequency :
30 ~ 15,000Hz (DIN) Head:
40~14,000Hz +3dB
Normal tape; 25 ~ 14,000 Hz ; ;
30 ~ 13,000Hz (DIN) Dimensions:
40~12,000Hz +3dB
Signal-to-noise ratio: Dolby* NR in; 67 dB (above 5kHz)
Dolby NR out; 57dB
(signal=max. recording level, Weight :
FeCr/CrQz type tape)
Fast forward and no
rewind time: Approx. 90 seconds with C-60 cassette tape
Specifications are subject to change without notice.
MIC; sensitivity 0.25 mV, input impedance 10 KQ,
applicable microphone impedance 400Q~ 20 KQ
LINE ; sensitivity 60 mV, input impedance 33 KQ
LINE; output level 420 mV, output impedance
1KQ or less, load impedance 47 KQ over
HEADPHONE ; output level 60 mV, load
impedance 822
SP DIN type; input sensitivity 0.26 mV, impedance
1.5 KQ, output level 420 mV, impedance 10 KQ
83 kHz
2-head system
1-HPF head for record/playback
1-doubl-gap ferrite head for erasure
43.0cm(W) X 14.9 cm(H) x 26.7 cm(D)
15.8cm(H) X 46.6 cm(W) x 26.7 cem(D)
[6-1/2"(H) x 18-3/8"(W) x 10-1/2"(D)] for PX
7.6kg for European areas
7.8kg (16 lbs 5 oz) for other area without
European areas
9kg (19 Ibs 14 02) for PX
*'Dolby' and the double-D symbol are trademarks of Dolby Laboratories.