Technics RS-M226 - Service Manual

ORDER NO. ARD82060161C8-11
Service
Manual
Cassette Deck
Soft-Touch
Cassette
RS-M226
Deck
with
Dolby
B-C
NR
(ee
Sied
Silver
Face
This is the Service Manual for the }
| following areas.
a) oe For all European areas
| except United Kingdom.
|B) eee For United Kingdom. |
DC [porev 8-c nm
Please use this service manual for the RS-M226. (Discard the
service manual prepared for the order No. ARD82050142C8-11.)
RS-M24 MECHANISM SERIES
Specifications
Track system: 4-track 2-channel stereo recording and playback Inputs: MIC; sensitivity 0.25 mV, applicable microphone
r. a ety impedance 4002—10kQ—
gee SReees Ones LINE; sensitivity 60 mV, input impedance more
Wow and flutter: 0.048% (WRMS), +0.14% (DIN) er . ce ae eee
: ut lev m impedan
Frequency response: Metal tape; 20—18,000Hz ae less ia 23 ko Dia ee aos
30— 17,000 Hz (DIN) HEADPHONES; output level 80mV (82)
CrOz tape; 20—18,000Hz applicable headphone impedance 8 2—600 Q
30— 16,000 Hz (DIN) Bias frequency : 80 kHz
Normal tape; 20 17,000Hz Motor: Electrical DC governor motor
30 — 15,000Hz (DIN) Heads: 2-head system
1 MX head for rec/playback
Signal-to-noise ratio: Dolby C NR in; 75dB (CCIR) 1 double-gap ferrite head for erasure
Dolby B NR in; 67 dB (CCIR) Power requirements: [DB] --- AC 220 V, 50-60 Hz
NR out: 57dB (for all European areas except United Kingdom.)
(signal level=max. input level A weighted, CrO eee
gnal level =max. input level A weighted, CrO2 ;
(only for United Kingdom.)
type tape) Power consumption: 12W
Fast forward and Dimensions: 43.0 cm(W) x 10.9cm(H) X 23.3 cm(D)
rewind time: Approx. 90 seconds with C-60 cassette tape Weight: 4 Okg
Specifications are subject to change without notice.
* ‘Dolby’ and the double-D symbol are trademarks of Dolby Laboratories.
Technics
Matsushita
Electric
Trading
Co.,
Ltd.
P.O.
Box
288,
Central
Osaka
Japan

Technics RS-M226 Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.8 cm/s
Tape Type	Normal, CrO2, Metal
Power Supply	AC 120V, 60Hz
Type	Cassette Deck
Heads	1 x record/playback, 1 x erase
Motor	DC Motor
Signal-to-Noise Ratio (Dolby B ON)	74 dB
Wow and Flutter	0.07% WRMS
Input	Line In
Output	Line Out
Output Level/Impedance	0.775 V / 1 kΩ
Dimensions	430 x 119 x 230mm

Summary

Location of Controls and Components

Measurement and Adjustment Methods

Head Position Adjustment

Adjusts tape touch of the head in cue or review mode for proper playback.

Dolby NR Circuit Check

Checks Dolby-B and Dolby-C circuit frequency response characteristics.

Block Diagram

Dolby System Block Diagram (L-CH ONLY)

Block diagram of the Dolby B/C encode/decode circuits for the left channel.

Dolby-B Encode Block Diagram

Block diagram for Dolby-B noise reduction encoding.

Dolby-C Encode Block Diagram

Block diagram for Dolby-C noise reduction encoding.

Dolby-B Decode Block Diagram

Block diagram for Dolby-B noise reduction decoding.

Dolby-C Decode Block Diagram

Block diagram for Dolby-C noise reduction decoding.

Schematic Diagram

Schematic - Main Section

Schematic diagram for the main audio processing and control circuits.

Schematic - Power Supply Section

Schematic diagram of the power supply and transformer circuits.

Circuit Boards and Wiring Connection Diagram

Wiring Diagrams - Main and Power Supply Boards

Wiring diagrams for the main and power supply circuit boards.

Motor Unit Disassembly

Precautions for Mechanism Unit Assembly

Circuit Boards and Wiring Connection Diagram (Correction)