Technics RSM 275 X Service Manual

Page 1

ORDER NO. ARD82050 14108-24

Service Manual

Cassette Deck

db: Equipped Direct Drive RSM275X

Stereo Cassette Deck (Silver Face)
Black Face

op@

t This is the SerVIce Manual for the t

« following areas.
i

@ -For all European areas
[ except United Kingdom.
l I -For United Kingdom. .
- For Asia, Latin America, [
l Middle East and Africa
l areas.
RS-M250 MECHANISM SERIES
Specifications
Track system 4rtrack 2rchanriel stereo recording and playback inputs lVllC. senSitiVity O 25 mV. applicable microphone
Tape speed 4 8cm 5 impedance 4009 10k$2
WOW and flutter o 03 % (WRMS). :o 07 % (DlN) LiNE. sensmvitv 60 W input impedance more
Frequency response Meta tape. 20 20000 Hz than 47kg)
25" 19000 Hz (DlN) Outputs LlNE. output level 700 mV. output impedance
30 18 OOOHZ :3dB 15k§2 or less
CrO; tape. 20 19.000l-lz HEADPHONES. output level 130 mV (83A) appl ,
25 18.000 l-lz (DlN, cable headphone impedance 8Q 6009
33 17.000 HZ :3dB Bias frequency 85kH:
Norma tape, 20 18.000 Hz Motor 3motor system
2:) 17~OOOHZ (3;ng lrFG servo controlled directedrive motor
A 30 16,000Hz , P ZVDC motors tor reeirtable drive
Dynamic range 1.0dB (at 1kl-lz). dbx in Heads 27head system
Max le level LAX (AMORPHOUS) head tor record playback
improvement 10dB or more irrproved With dbx in (at 1

SlgflaiitfliflOlSE ratio dbx in. 92 dB
DolbyC NR in. 76dB (CClR)
BSZYHBSNESZBntggrilBléSSEhnaX input level A Preset power voltage 240V for United Kingdom
weighted. 00/ type tape) Power consumption 37W
Fast fem/yd and DimenSioris. 43 Ocm(W) X 9 8cm(H) X 32 6cm(Di

reWinotime Approx 90 seconds With C 60 cassette tape Weight 6 5kg

Power reqwement 1101252201240 V. 50760 HZ
Preeset power voltage 220V

Specitications are subiect to change Without notice
* The term dbx is a registered trademark of dbx lot:
"I Dorby and the doublerD symbol are trademarks of Dolby Laboratorles

' I ' hnic Matsushita Electric Trading 60., Ltd.
ec S PO Box 288. Central Osaka Japan

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-M275X

CONTENTS

ITEM
LOCATION OF CONTROLS AND COMPONENTS
DISASSEMBLY INSTRUCTIONS ---------------------
MEASUREMENT AND ADJUSTMENT METHODS

(WITHOUT dbx SYSTEM) -------------------- 5
MEASUREMENT AND ADJUSTMENT METHODS

(FOR dbx SYSTEM) .............................................. 11

- TROUBLESHOOTING CHART FOR dbx SYSTEM ----- 11

° ADJUSTMENT PARTS LOCATION OF dbx

SYSTEM ................................

' dbx SYSTEM CHECKING METHOD

' ADJUSTMENT OF dbx SYSTEM

- CHECKING PROCEDURE FOR PROBLEMS
ELECTRICAL PARTS LOCATION
BLOCK DIAGRAM-
SCHEMATIC DIAGRAM

(MAIN CIRCUIT SECTION/DOLBY CIRCUIT

SECTION) ...........................................................
CIRCUIT BOARD DIAGRAMS

(MAIN CIRCUIT BOARD/DOLBY CIRCUIT BOARD)
SCH EMATIC DIAGRAMS

(dbx CIRCUIT SECTION/POWER TRANSFORMER

CIRCUIT SECTION/VOLTAGE REGULATOR

CIRCUIT SECTION) ............................................ 31

I .
ITEM PAGE
CIRCUIT BOARD DIAGRAMS
(dbx CIRCUIT BOARD/VOLTAGE REGULATOR
CIRCUIT BOARD) .................................................. 33
SCHEMATIC DIAGRAM
(FL METER CIRCUIT SECTION) ----------------------------- 35

SCHEMATIC DIAGRAMS

(OD CAPSTAN MOTOR CIRCUIT SECTION/HALL

IC CIRCUIT SECTION) ........................................... 37
CIRCUIT BOARD DIAGRAMS

(D.D CAPSTAN MOTOR CIRCUIT BOARD/FL

METER C|RCU|T BOARD) ...................................... 38
SCHEMATIC DIAGRAMS

(MECHANISM CONTROL CIRCUIT SECTION/

LEAF SWITCH CIRCUIT SECTION)-
CIRCUIT BOARD DIAGRAM

(MECHANISM CONTROL CIRCUIT BOARD)~~~
CABINET PARTS LOCATION --------
WIRING CONNECTION DIAGRAM-
MECHANICAL PARTS LOCATION

-.39

41

-42
-43
-- 46

LOCATION OF CONTROLS AND COMPONENTS

//I I

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K
DSUNR

LEITape IndICatOI

[Auto Tape Select

Dolby NH IndIcator

I- 0- ~81
NR indicator
LEE] lape- dIsC]

[Intro search on]

(Noimal- CTO, Metal I]

Introductlon search IndICator

Power switch [power (push on)]

Eject button [eject]

Cassette holder

Rewind button [rew (M - S) (44)]
Record button and indicator [rec (0)]
Pause button and indicator [pause ( II I]
Play button and indicator [play ( > )]
Record muting button [rec mute (0)]
Fast lorward button [if (M - 5) (>>)]
Digital multi counter [multi counter]

FL (fluorescent level) meter

Indicator

Input level controls [input level (LQRH
Microphone jacks [mic (L - R)]

Output level control [output level]

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(é)

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5

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{354

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Bias fine adjustment control [bias adjust]
Noise reduction select switch [Noise reduction
(Dolby NR C - B - out - dbx tape - disc)]

Counter reset button [counter reset]

Music select button [music select]

Set button [set]

/ Tape/time select button [tape/time]

Memory repeat button [memory repeat (0" - on)]

1 Stop button [stop (I )]

Introduction search button [intro search]
Headphones jack [phones]
Timer start switch [timer (rec - oft - playl]

, Line output jacks [LINE OUT (L - R)]

Line input jacks [LlNE IN (L- R)]

Voltage selector [VOLTAGE SELECTOR)

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