Technics RSM 280 Service Manual
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Extracted text from Technics RSM 280 Service Manual (Ocr-read)
Page 1
ORDER NO. ARDBIO70071C8-34
Service Manual
Quartz-Locked Direct-Drive Stereo Cassette Deck
with 3Head, Double Capstan System
on-
RS-M250 MECHANISM SERIES
Specifications
Track system.
, Tape speed:
Wow and flutter:
Frequency response:
Signal-to-noise ratio:
Fast forward and
rewind time:
4-track 2-channel stereo recording and playback
4.8cm/s
0.024% (WRMS), i0.09% (DIN)
Metal tape; 18-22000 Hz
20 W, 20,000 Hz (DIN)
25*19,OOOH2 i3dB
18-21000 Hz
20-20,000Hz (DlN)
25-18,000Hz :3dB
18*20,0DOHZ
07719.000Hz (DIN)
25-17,000Hz i3dB
Dolby NR in; 70dB (above 5kHz)
Dolby NR out; 60dB
(signal leve|=peak level A weighted, Cr02
type tape)
Cr02 tape;
Normal tape;
Approx. 80 seconds with 060 cassette tape
lnputs:
Outputs :
Bias frequency
Heads:
Motor:
Power reqmrement'
Power consumption:
Dimensions:
Weight:
Specnications are subject to change without notice
t Dolby' and the doublerD symbol are trademarks of Dolby Laboratories.
Technics
Cassette Deck
RS-M280
(Silver Face)
Black Face
This is the Service Manual for the
following areas.
El --------- For all European areas l,
except United Kingdom, l
~For United Kingdom, l
. -- --»-For A5ia4 Latin America, l
l Middle East and Africa f
areas. l
-For Australia. l
MIC, sensitivity 0.25mV, input impedance 9m
applicable microphone impedance 4009* 10 kg
LINE; sensitivity 80 mV, input impedance 42 k9
LINE; output level 700 mV, output impedance
2.5 kg) or less load impedance 22 kg over
HEADPHONES; output level 125mV, load
impedance 89
85 kHz
3- head system
2 SX (Sendust Extra) beads for record/playback
1 double- -gap ferrite head for erasure
3-motor system
1 Quartz locked Direct Drive motor
2 DC motors for reel-table drive
AC; 110/125/220/240V, 50-60 Hz
EJII, 25W
: 20 W
43cm(W) X97 cm(H) X340 cm(D)
6 3 kg
Matsushita Electric Trading 00., Ltd.
PO. Box 288, Central Osaka Japan
Page 2
RS-M28O
CONTENTS
ITEM PAGE
LOCATION OF CONTROLS AND COMPONENTS ............................................. 2
DISASSEMBLY INSTRUCTIONS .................................................................. 3
BLOCK DIAGRAM ...................................................................................... 4
MECHANISM AND AMPLIFIER SYSTEM BASED
ON MICROCOMPUTER OF RS-M280 ............................................................ 4
MEASUREMENT AND ADJUSTMENT METHODS .......................................... 5
MN1400RZ: EACH TERMINAL FUNCTION & WAVEFORM ------------------------------ 11
TROUBLESHOOTING OF MAIN CONTROL CIRCUIT --------------------------------------- 15
DD MOTOR CIRCUIT CHECK POINTS ......................................................... 17
TROUBLESHOOTING OF D.D MOTOR CIRCUIT ............................................. 19
ELECTRICAL PARTS LOCATION .................................................................. 20
SCHEMATIC DIAGRAM
MAIN/FL METER/POWER SUPPLY SECTION ....................................... 21
CIRCUIT BOARDS
MAIN/FL METER/POWER SUPPLY CIRCUIT BOARDw --------------------------- 22
SCHEMATIC DIAGRAM
D.D MOTOR SECTION ........................................................................ 23
CIRCUIT BOARD
D.D MOTOR CIRCUIT BOARDS ............................................................ 23
SCHEMATIC DIAGRAM
MAIN CONTROL SECTION .................................................................. 24
CIRCUIT BOARD
MAIN CONTROL/KEY BOARD/REMOTE CONTROL JACK/
LED/SWITCH(S8, 9) CIRCUIT BOARD ................................................ 24
WIRING CONNECTION DIAGRAM ............................................................... 25
MECHANICAL PARTS LOCATION ............................................................... 25
CABINET PARTS LOCATION ........................................................................ 27