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MITSUBISHI

AUDIO SYSTEMS

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SERVICE MANUAL

METAL ALLOY TAPE COMPATIBLE

STEREO CASSETTE DECK
MODELL DT-4OS

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PHONIS

CONTENTS

SPECIFICATIONS ................................................................ 2
FRONT PANEL THERMINOLOGY AND FUNCTIONS ........................................ 3
DISASSEMBLY INSTRLCTIONS ...................................................... 5
ADJUSTMENT OF MEC ANICAL SECTION .............................................. 7
ADJUSTMEN" OF TAPE-TRANSPOR SYS EM ........................................... 8
ELECTRICAL ADJUSTMENTS ........................................................ 9
WIRING ...................................................................... 13
SCHEMATIC DIAGRAM (1/2) ....................................................... 15
SCHEMA"IC DIAGRAM (2/2) ....................................................... 16
PRINTED CIRCUIT BOARDS ........................................................ 18
EXPRODED VIEW OF MECHANISM ................................................... 23
EXPRODED VIEW OF CABINET ..................................................... 24
PARTS LIST ................................................................... 25

MITSUBISHI ELECTRIC SALES AMERICA, INC.

3030 East Victoria Street Compton, California 90221

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SPECIFICATIONS

Type .................................... 4 track, 2 channel Stereo Cassette Deck
Drive system ............................... 2 motor, closed loop dual capstan system
Motor type
Capstan motor .......................... PLL servo DC motor
Reel motor ............................ DC motor
Number of heads ........................... _. 3
Head material
REC/PB head ........................... Sendust (Combination type)
Erase head ............................. Sendust/Ferrite
Tape speed ................................ 4.75cm/sec. (1-7/8 ips)
Tape speed .accuracy .......................... i1 %
Wow and flutter (Playback) ..................... 0.05% Wrms
Fast forward/rewind times ...................... 80 sec. (C-6O tape)

Signal to noise ratio
(400Hz, 3% THD, Weighted, Metal tape)
Dolby NR out .......................... 60 dB
Dolby NR in ........................... 68 dB

Frequency response (13 dB, record level
160pwb/mm -20 dB)

Normal tape ........................... 4O - 15,000Hz
Special tape ............................ 40 - 17,000Hz
Metal tape ............................. 4O - 20,000Hz
Fe-Cr tape ............................. 40 - 18,000Hz
Erasure ratio (1kHz) .......................... 65 dB
Crosstalk (1kHz)
Between channel ........................ 35 dB
Between tracks .......................... 65 dB
Harmonic distortion
(400Hz 160pwb/mm) ....................... 1%
Sensitivity/impedance
Mic input ............................. 0.3mV (2.2k ohms)
Line input ............................. IOOmV (47k ohms)
Output level
Line output ............................ SOOmV (22k ohms Load)
Headphones ............................ 2mW (8 ohms Load)
Bias frequency .............................. 105kHz
Power consumption .......................... 30W
Dimensions (W x H x D) ....................... 425 x 169 x 379 mm
(16-3/4 x 6-3/4 x 14-7/8")
Weight ................................... 12kg (26.4 lb)

DOLBY" and the Double D symbol [lg " are trademarks of Dolby Laboratories.

Specifications of this unit are subject to change without notice for improvement.