Technics RS-M7

Front-Loading Vartical Hold Stereo Cassette Deck
with Full Auto-Stop Mechanism and Dolby NR
DO [acevsverew]
RS-631 MECHANISM SERIES
Specifications
Power requirement:
Power consumption:
Motor:
Track system:
Tape speed:
Wow and flutter:
Frequency response:
Signal-to-noise ratio:
For All European areas except United Kingdom
AC; 110/220 V, 50/60 Hz
For Asia, Latin America, Middle East and Africa
areas
AC; 110/125/240V, 50/60 Hz
For Australia
AC; 240V, 50/60 Hz
10W
Electronic control DC motor
A-track 2-channel stereo recording and playback
4 8cm/s
0.08% (WRMS), +0.20% (DIN)
CrO2/Fe-Cr tape; 30 ~ 15,000 Hz
30 ~ 14,000 Hz (DIN)
30 ~ 14,000 Hz
30 ~ 13,000 Hz (DIN)
Dolby NR in: 66 dB (above 5kHz)
Dolby NR out; 56dB (signal level =max. record-
ing level, Fe-Cr/CrO2 type tape)
Normal tape;
ervice Manual
Fast forward and
rewind time:
Input :
Output:
Rec/pb connection:
Bias frequency :
Head :
Dimensions :
Weight :
Specifications are subject to change without notice.
* ‘Dolby’ and the double-D symbol are trademarks of Dolby Laboratories.
‘Technics
ORDER NO. ARD-7903018C
Cassette Deck
RS-M7
( Silver iat
Black Type
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This is the Service Manual for the
following areas.
[D] ..---.--- For All European areas
except United Kingdom.
[N] «+--+ +. For Asia, Latin America,
Middle East and Africa
areas.
teteenens For Australia.
= =
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Approx. 86 seconds with C-60 cassette tape
MIC; sensitivity 0.25 mV, input impedance 33 K2
applicable microphone impedance 4002 ~
10 KQ
LINE; sensitivity 60 mV, input impedance 47 KQ
LINE; output level 420 mV, output impedance
1KQ or less, load impedance 22 KQ over
HEADPHONE ; output level 65 mV, load
impedance 82
5P DIN type;
input sensitivity 0.25 mV, impedance 8.2 KQ
output level 420 mV, impedance 4.7 KQ2
80 kHz
2-head system;
l-super permalloy head for record/playback
1-double-gap ferrite head for erasure
41.0cm(W) x 14.2cm(H) x 25.4cm(D)
4 5kg
Matsushita Electric Trading Co., Ltd.
P.O. Box 288, Central Osaka Japan

Technics RS-M7 Specifications

General

Track System	4-track, 2-channel stereo
Motor	DC Servo Motor
Tape Type	Normal, CrO2, Metal
Wow and Flutter	0.05% (WRMS)
Tape Speed	4.8 cm/s
Heads	1 x record/playback, 1 x erase
Noise Reduction	Dolby B
Dimensions	430 x 130 x 290mm
Output	400mV (line)

Summary

Location of Controls and Components

Disassembly Instructions

Measurements and Adjustments

Head Azimuth Adjustment

Procedure for adjusting the record/playback head angle for maximum output.

Tape Speed Accuracy and Fluctuation

Measuring and adjusting tape speed accuracy and fluctuations.

Playback Gain Adjustment

Measuring and adjusting playback gain for both channels.

Bias Current Adjustment

Adjusting the bias current for recording, with conditions and measurement.

Erase Current Measurement

Measuring erase current using a resistor and voltage.

Overall Gain Adjustment

Measuring and adjusting recording/playback gain.

Level Meter Adjustment

Adjusting input levels for the VU meters to indicate 0dB.

Overall Frequency Response Measurement

Measuring frequency response for record/playback across different tape types.

Recording Equalizer Coil Adjustment

Adjusting equalizer coils for normal tape recording response.

Dolby Circuit Adjustment

Checking Dolby circuit performance by comparing signal levels.

Frequency Response Adjustment

Adjusting frequency response using bias current for tape types.

Dolby NR Circuit Operation Check

Confirming Dolby NR circuit gain difference between IN and OUT positions.

Bias Current Measurement for Recording

Measuring bias current using VTVM and formula.

Erase Current Measurement

Measuring erase current by voltage across a 1 Ohm resistor.

Overall Gain Measurement

Measuring overall gain using AF oscillator, VTVM, and test tape.

Level Meter Calibration

Adjusting VR501 and VR502 for level meters to indicate 0dB.

Overall Frequency Response Charts

Charts detailing frequency response tolerances for various tape types.

Overall Frequency Response Adjustment

Adjusting frequency response using bias current.

Adjustment Parts Location

Electrical Parts List

Cabinet Parts List

Schematic Diagram

Wiring Connection Diagram

Exploded Views