Technics RSM 51 Service Manual

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ORDER NO. ARD-8007074C

Service Manual

Cassette Deck

RS-M51

Metal Tape Compatible Stereo Cassette Deck with (Silver Face)

Autorec Sensor, AutorTape Selector,
PeakeHold 2~Co|or FL Meters and Soft-Touch Controls

m DOLBY SYSTEM This is the Service Manual for the

following areas,

--------- For Asia, Latin America,
Middle East and Africa
areas.

El ......... For Australia.
[E] .. 'For Asian PX.
III ttttttttt For European PX.

RS-M24 MECHANISM SERIES

Specifications
Track system detrack 2Achannel stereo recording and playback LlNE; seriSitii/ity 60 mV, input impedance 98 kg
Tape speed 4 Born/s (1'7/8li35) Outputs' LlNE; output level 700 mV, output impedance
' ' 2,5k52 or less load impedance 22 k9 over
. + 0
WW and my 0 045% lWRMSl *013 /° (D'Nl HEADPHONE, output level 125 mV. load impede
Frequency response' Metal tape, 20 18,000 Hz + ance 8/12582
C O, 'F C t $712883 S2 3dB Bias frequency 75kHz
r i/ e- r ape, 3O--16IOOOH: +3dB Motor Electrical control DC governor motor
7 i 7 Heads 27head system,
Normal tape, ggigggg :: i3dB 1-MX head for record/playback

lrsendust/territe doublergap head for erasure
Power requirements AC, 110/125/220/240 V, 50760 Hz
(240V. only tor Australia)
Power consumption 17W

Signal-toenOise ratio Dolbf NR in; 67 dB (above 5kHz)
Dolby NR out; 57dB (Signal level:max record
ing level, FevCr/Cr02 type tape)
Fast forward and

rewind time Approx 90 seconds With 060 cassette tape Dimemlons {l3 OchN) X11.9cm(l-l) X27.0cmSD)
lnputs MlC, sensitiwty 0,25mV, input impedance 7 6kg} Weight k16'7/8 (W) X4r3/4 (H)><1075/8 (D)]
applicable microphone impedance 40097 6kgl13 lbs 3 OZ)
10k§2

Specifications are subiect to change Without notice
r 'Dolby and the doublerD symbol are trademarks ot Dolby Laboratories.

. Panasnnli: Tokyo
ec nlcs Mllsushila Electrlc Tradlng Co., Ltd. Matsushlta Electrlc lndustrlul 00., Ltd.
P.O. Box 288, Central Osaka Japan 17-15. 6-chome. Shrnbashl, Minalo-ku, Tokyo 05 Japan

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RS-M51

CONTENTS

ITEM
LOCATION OF CONTROLS AND COMPONENTS -------------------

DISASSEMBLY INSTRUCTIONS .............................................................. 2
DISASSEMBLY NOTES (MECHANISM UNIT) ............................................ 3
ASSEMBLY INSTRUCTIONS .................................................................. 4
OPERATING PRINCIPLE OF AUTOMATIC INPUT CHANGEOVER MECHANISM -------------------------------- 6
TECHNICAL INFORMATION OF AUTO-REC SENSOR .................................................................... 7

MEASUREMENT AND ADJUSTMENT METHODS --------------------------------------
SCHEMATIC DIAGRAM (MAIN AMP AND DIGITAL VR SECTION) ---------------

CIRCUIT BOARDS (MAIN AMP AND EQUALIZER CIRCUIT BOARD) .............................................. 14
SCHEMATIC DIAGRAM (DIGITAL VR CONTROL, POWER SUPPLY AND FL METER SECTION) ---------- 15
CIRCUIT BOARDS (DIGITAL VR CONTROL POWER SUPPLY AND FL METER CIRCUIT BOARD) ~~~~~~~ 16
ELECTR|CAL PARTS LOCAT|0N ................................................................................................ 16
WIRING CONNECTION DIAGRAM ------------------------ 17
MECHANICAL PARTS LOCATION ........................ 18
CAB|NET PARTS ..................................................................................................................... 19

LOCATION OF CONTROLS
AND COMPONENTS

@ @ ® 29 ®
Ell
® Power switch (power) @ Pause button (|| pause)
® Cassette holder Record-muting button (rec mule)
© Tape selector indicators (normallCrOleetal/Fe-Cr) ® Dolby noise-reduction switch (Dolby NR)
(9 Tape counter and Reset button (tape counter) ® Recording level variation button
(5) Microphone indicator (mic) [level llne adlust (downlup)]
Dolby noise reduction indicator (Dolby NR) @ Recording level detection indicalor (search)
® Recording indicator (rec) @ Recording level automatic selling button
® Recording level setting indicator [autorec sensor (autorec level sensor)]
(level sensor read-oul) ® Recording level setting complete indicator (level sel)
® FL (fluorescent level) meters @ Microphone lacks (L mic R)
Headphones jack (phones) @ Output level control (OUTPUT LEVEL)
® Eject button (A eiecl) ® Remotecontrol conneclor (REMOTE CONTROL)
® Record button (0 rec) @ Lille output iaclts (LINE OUT) (R - L)
® Rewind/Review button (44 rewlrev) @ Line input jacks (LINE m) (R . L)
@ Fasl forward/Cue button (b) "/cue) @ Tape selector [tape select -(MetaIICrOzInormal)/
@ Play button (} play) (Fe-CrIMelal)]
® Slop button (I slop) @ Voltage selector (VOLTAGE SELECTOR)
(- ----- For PX. )
IE] --------- For Asia, Latin America, Middle East and Africa areas.