Sony M-450 Service Manual
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- Operating instructions (2 pages) ,
- Specifications (2 pages) ,
- Operating instructions (2 pages)
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SERVICE MANUAL
Ver 1.2 2004.05
Sony Corporation
9-873-588-03
Personal Audio Company
2004E02-1
Pubulished by Sony Engineering Corporation
© 2004.05
Photo : M-450
SPECIFICATIONS
Tape
(MICRCCASSETTE)
™
(normal position type)
Recording system
2-track 1-channel monaural
Speaker
Approx. 3.6 cm (1
17
⁄
in.) dia.
16
Tape speed
2.4 cm / s (
15
⁄
ips), 1.2 cm/s (
15
16
Frequency range
300 - 4 000 Hz (with TAPE SPEED switch at 2.4 cm/s)
Output
Earphone jack (minijack) for 8 - 300 Ω earphone
Power output (at 10% harmonic distortion)
250 mW
Power requirements
3 V DC batteries R6 (size AA) × 2 / External DC 3V power
sources
Dimensions (w/h/d)
Approx. 62.2 × 119.1 × 25.4 mm (2
projecting parts and controls
Mass
Approx. 109 g (3.9 oz) (main unit only)
Supplied accessories
Microcassette tape MC-30 (1) (M-450 : EE/M-455 : E)
Design and specifications are subject to change without notice.
M-450/455
East European Model
Model Name Using Similar Mechanism New
Tape Transport Mechanism Type
⁄
ips)
32
× 4
× 1 in.) incl.
1
3
⁄
⁄
2
4
MICROCASSETTE
E Model
M-450/455
Chinese Model
M-450
MZ-455-99
™
-CORDER
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Table of Contents
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Summary of Contents for Sony M-450
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Page 1: Specifications
⁄ ⁄ projecting parts and controls Mass Approx. 109 g (3.9 oz) (main unit only) Supplied accessories Microcassette tape MC-30 (1) (M-450 : EE/M-455 : E) Design and specifications are subject to change without notice. ™ MICROCASSETTE -CORDER Sony Corporation... -
Page 2: Table Of Contents
M-450/455 Ver 1.2 TABLE OF CONTENTS Flexible Circuit Board Repairing • Keep the temperature of the soldering iron around 270°C during repairing. Specifications ................1 • Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). -
Page 3: General
M-450/455 SECTION 1 This section is extracted from instruction manual. GENERAL... -
Page 4: Disassembly
M-450/455 SECTION 2 DISASSEMBLY The equipment can be removed using the following procedure. Cassette holder ASSY Cabinet (rear) Cabinet (front) Main board, Mechanism deck Head, magnetic (HRPE901) Motor (M901) 2-1. CASSETTE HOLDER ASSY Cassette holder ASSY 1 Eject 2-2. CABINET (REAR) -
Page 5: Cabinet (Front)
M-450/455 Cabinet (front) 2-3. CABINET (FRONT) Knob (tape speed) 2 Mic case S902 NOTE DURING ASSEMBLY Align S902 and knob (tape speed). 1 Remove solder (two places) To speaker 2-4. MAIN BOARD, MECHANISM DECK Mechanism deck Main board 1 Screw... -
Page 6: Head, Magnetic (Hrpe901)
M-450/455 Ver 1.2 2-5. HEAD, MAGNETIC (HRPE901) 2 arm (pinch roller) assy 3 M1.4, special head 4 M1.4, special head 5 head, magnetic 1 claw (HRPE901) 2-6. MOTOR (M901) How to apply the belts belt (flywheel) belt (counter, tape) flywheel assy... -
Page 7: Adjustments
M-450/455 SECTION 3 ADJUSTMENTS 3-1. MECHANICAL ADJUSTMENTS 3-2. ELECTRICAL ADJUSTMENTS 0db=0.775V PRECAUTION Standard Output Level Output terminal 1. Before adjusting, clean the following parts with a piece of cot- Load impedance 8Ω ton moistened with alcohol. Output level 78mV (– 20dB) - Page 8 M-450/455 Tape Speed Adjustment Switch position VOLUME : Mechanical center VOR switch : OFF Procedure : After adjusting the 2.4cm/s speed, adjust the 1.2cm/s speed. – Playback – speed checker Test tape WS-24, WS-12 frequency counter (3kHz, –10dB) 8 Ω...
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Page 9: Diagrams
M-450/455 SECTION 4 DIAGRAMS 4-1. BLOCK DIAGRAMS PRE AMP IC101 (1/2) VREF RF OUT RIPPLE BTL POWER AMP FILTER IC101 (2/2) RF IN PRE+IN PRE OUT POW+INA PRE-IN OUTA POW-INA J101 POW+INB OUTB POW-INB MIC901 +VCC Q103 Q101 MUTE SP901... -
Page 10: Printed Wiring Boards
M-450/455 4-2. PRINTED WIRING BOARDS – MAIN BOARD – DC IN 3V MAIN BOARD DRY BATTERY SIZE "AA" (IEC DESIGNATION R6) 2PCS, 3V • Semiconductor Location MIC901 Ref. No. Location D101 D301 IC101 IC601 Q101 Q102 M901 Q103 CAPSTAN/ Q104... -
Page 11: Schematic Diagram
M-450/455 4-3. SCHEMATIC DIAGRAM... - Page 12 M-450/455 Note on Schematic Diagram : Note : • All capacitors are in µF unless otherwise noted. pF: µµF 50WV or less are not indicated except for electrolytics and tantalums. • All resistors are in Ω and W or less unless otherwise specfied.
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Page 13: Exploded Views
M-450/455 SECTION 5 EXPLODED VIEWS NOTE : • Hardware (# mark) list and accessories and • Abbreviation • -XX, -X mean standardized parts, so they packing materials are given in the last of this Chinese may have some difference from the original parts list. -
Page 14: Cabinet (Front) Section
M-450/455 5-2. CABINET (FRONT) SECTION MIC901 SP901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-704-197-31 LOCK, SERRAT IB 3-236-699-31 CABINET (FRONT) (455) 3-831-441-99 SPACER, KNOB * 53 A-3021-746-A MAIN PC BOARD ASSY X-3381-673-1 HOLDER ASSY, CASSETTE (450) -
Page 15: Mechanism Deck Section
M-450/455 Ver 1.2 5-3. MECHANISM DECK SECTION (MZ-455-99) M901 HRPE901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-028-965-01 SPRING (PINCH ARM), TORSION 3-028-957-01 SPRING (CAM GEAR),TENSION 3-704-197-71 SCREW (M1.4X4.5), LOCKING 3-028-966-03 GEAR (S-OFF-OW), CAM 3-028-960-01 SPRING (AZIMUTH), COMPRESSION... -
Page 16: Electrical Parts List
M-450/455 SECTION 6 MAIN ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS When indicating parts by reference num- In each case, u : µ , for example : parts list may be different from the parts ber, please include the board. - Page 17 M-450/455 Ver 1.2 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark JC141 1-216-296-11 SHORT R141 1-216-829-11 METAL CHIP 4.7K 1/16W JC142 1-216-296-11 SHORT R142 1-216-841-11 METAL CHIP 1/16W JC143 1-216-296-11 SHORT R143 1-216-833-11 METAL CHIP...
- Page 18 M-450/455 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2002.02...