Technics RS-B205

ORDER NO. HAD8602333C2
Service Manual
OC [Beusve:
Dolby B « C NR-Equipped
Stereo Cassette Deck
RS-D550W MECHANISM SERIES
SPECIFICATIONS
Deck system
Track system
Heads
REC/PLAY
Erasing
Motor
Recording system
Bias frequency
Erasing system
Tape speed
Frequency response
Metal
Cro,
Normal
Stereo cassette deck
4-track, 2-channel
MX head
Double-gap ferrite head
1 motor system
AC bias
50kHz
AC bias
4.8cm/sec.
20Hz~16,000Hz
30 Hz~15,000 Hz (DIN)
40Hz~15,000Hz+3dB
20Hz~15,000Hz
30Hz~15, 000 Hz (DIN)
40Hz~14,000Hz+3dB
20Hz~15,000Hz
30Hz~15,000 Hz (DIN)
40Hz~14,000Hz+3dB
S/N (Signal level=max. recording level, CrO, type tape)
Dolby C NR in
Dolby B NR in
NR out
72dB (CCIR)
66 dB (CCIR)
56dB (A weighted)
Technics
Cassette Deck
RS-B205
Color
(K)...Black Type
(S)...Silver Type
(K) (S) } [E] All European
areas except
United Kingdom.
(K) (S) | [EK] United Kingdom.
(K) (S) | [EGA]....F.R. Germany.
Wow and flutter 0.08% (WRMS) +0.2% (DIN)
Fast forward and rewind time
Approx. 105 seconds with C-60 cassette tape
Input sensitivity and impedance
MIC 0.25mV/400Q~10kQ
LINE 60mV/47kQ
DIN...[EGA] only 0.25mV/3.3kQ
Output voltage and impedance
LINE 400 mV/3.2kQ
HEADPHONES 65mV/8Q
Power consumption ow
Power supply (E] [EGA] ................. AC 50H2/60Hz 220V
EK] ssteeiecticciccen tics AC 50H2/60Hz 240V
Dimensions (W x H x D) 430 x 115 x 220mm
Weight 3.0kg
* Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“Dolby” and the double-D symbol are trade marks of Dolby
Laboratories Licensing Corporation.
Matsushita Electric Trading Co., Ltd.
P.O. Box 288, Central Osaka Japan

Technics RS-B205 Specifications

General

Brand	Technics
Model	RS-B205
Category	Cassette Player
Language	English

Summary

SPECIFICATIONS

LOCATION OF CONTROL

OPERATION

Recording

Process for recording audio onto the cassette tape.

Timer RecordingPlayback

Instructions for scheduled recording and playback.

DISASSEMBLY INSTRUCTIONS

MEASUREMENT AND ADJUSTMENT METHODES

Head Azimuth Adjustment

Aligning the head for optimal audio playback and recording.

Tape Speed Adjustment

Calibrating the tape transport speed for accuracy.

Playback Frequency Response

Measuring the frequency range of playback.

Overall Frequency Response

Measuring the overall frequency response across different tapes.

Overall Gain Adjustment

Adjusting the audio signal gain for proper levels.

Dolby NR Circuit

Dolby B Encode Characteristic

Adjustment of Dolby B noise reduction encoding characteristics.

Dolby C Encode Characteristic

Adjustment of Dolby C noise reduction encoding characteristics.

BLOCK DIAGRAM

MAIN P.C.B.

POWER SUPPLY P.C.B.

LED METER P.C.B.

MECHANISM P.C.B.

TAPE SELECTORVOLUME P.C.B.

BIAS CURRENT ADJUSTMENT

OVERALL FREQUENCY RESPONSE

OVERALL GAIN ADJUSTMENT

DOLBY RR CIRCUIT

DOLBY B ENCODE CHARACTERISTIC

Adjustment of Dolby B noise reduction encoding characteristics.

DOLBY C ENCODE CHARACTERISTIC

Adjustment of Dolby C noise reduction encoding characteristics.