Sony m 673 v service manual

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2 M-670V/673V/675V TABLE OF CONTENTS Specifications ........................................................................\ .... 1 1. GENERAL ................................................................... 3 2. DISASSEMBLY 2-1. Cassette Lid Assy ............................................................ 4 2-2. Cabinet (Rear) ................................................................. 4 2-3. Main Board ...................................................................... 5 2-4. Mechanism Deck (MZ-670-99), LED Board .................. 5 2-5. Ceramic Head (REC/PB/Erase) (HRPE901) ................... 6 2-6. Motor (M901) .................................................................. 6 3. ADJUSTMENTS ........................................................ 7 4. DIAGRAMS 4-1. Block Diagrams ............................................................... 9 4-2. Printed Wiring Boards-“ Main Section (Side A)-“ ............ 10 Printed Wiring Boards-“ Main Section (Side B)-“ ............ 11 4-3. Schematic Diagram ......................................................... 12 4-4. IC Block Diagrams .......................................................... 13 5. EXPLODED VIEWS 5-1. Cabinet (Rear) Section .................................................... 14 5-2. Cabinet (Front) Section ................................................... 15 5-3. Mechanism Deck Section (MZ-670-99) .......................... 16 6. ELECTRICAL PARTS LIST .................................. 17 Flexible Circuit Board Repairing -Keep the temperature of the soldering iron around 270 °C during repairing. - Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). - Be careful not to apply force on the conductor when soldering or unsoldering. Notes on chip component replacement -Never reuse a disconnected chip component. - Notice that the minus side of a tantalum capacitor may be damaged by heat.

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3 M-670V/673V/675V SECTION 1 GENERAL This section is extracted from instruction manual. To monitor the soundConnect an earphone (not supplied) firmly to the EAR jack. The monitor volume cannot be adjusted by VOL. To prevent a cassette from being accidentally recorded over Break off and remove the cassette tabs. To reuse the cassette for recording, cover the tab hole with adhesive tape. Recording from Various Sound Sources Notes- When you are going to record something that you may not have an opportunity to record again, test the unit first before you actually sta\ rt recording. - When recording with an external microphone, the VOR system may not work properly because of the difference in sensitivity. Recording with an External Microphone Connect a microphone firmly to the MIC jack. M-673V : use the supplied microphone. Other models : use a microphone of low impedance (less than 3 k ). When using a plug-in-power system microphone, the power to the microphone is supplied from this unit. Recording from another equipment Connect another equipment firmly to the MIC jack using the connecting cord (not supplied). Set this unit to the recording mode and another equipment to the playback mode. Playing a Tape 1 Insert a cassette with the side to start playing facing the lid. 2 Select the tape speed to the same speed as that used for recording. 3 Press n. 4 Turn VOL to adjust the volume. There is a tactile dot beside VOL on to show the direction to turn up the volume. At the end of the tape, playback stops and the unit turns off automatically (Automatic shut-off mechanism). After the tape has been wound or rewound, be sure to press Tx. If you plug in headphones (not supplied) to the EAR jack, you will get monaural output from both left and right channels. To Press or slide Stop playback/stop fast Tx forward or rewind Pause playback Slide >PAUSE in the direction of the arrow. REC/BATT lamp goes off. To release pause playback , release > PAUSE*. Fast forward** (FF) Slide FF/CUE m-M REW/REVIEW toward FF/CUE m during stop. Rewind** (REW) Slide FF/CUE m-M REW/REVIEW toward M REW/REVIEW during stop. Search forward during Keep FF/CUE m-M REW/REVIEW playback (CUE) pushed toward FF/CUE m during playback and release it at the point you want. Search backward during Keep FF/CUE m-M REW/REVIEW playback (REVIEW) pushed toward M REW/REVIEW during playback and release it at the point you want. Start recording during z playback *> PAUSE will also be automatically released when Tx is pressed (stop-pause-release function). **If you leave the unit after the tape has been wound or rewound, the batteries will be consumed rapidly. Be sure to press Tx. NoteIf the tape is completely rewound while searching backward during playback (REVIEW), the FF/CUE m-M REW/REVIEW switch may not return to the center position when you release the switch. In this c\ ase, push back the switch to the center to start playback. To increase the playback speed Slide the FAST PB . switch in the direction of the arrow. The playback speed will be increased. To return to the original speed, slide the FAST PB . switch to the original position. Recording You can record right away with the built-in microphone. Make sure that nothing is connected to the MIC jack. 1 Press the reset button of the tape counter. 2 Press Tx and insert a standard microcassette with the side to start recording facing the lid. 3 Select the desired tape speed. 2.4 cm for optimum sound (recommended for normal use): A 30-minute recording can be made using both sides of the MC-30 microcassette (supplied for the United States and Europe only). There is a tactile dot on this side. 1.2 cm for longer recording time: A 60-minute recording can be made using both sides of the MC-30 microcassette (supplied for the United States and Europe only). 4 Set VOR to OFF. If you set VOR to ON, the unit automatically starts recording the sound and pauses when there is no sound (you can save tapes and batteries). When the sound is not loud enough, set it to OFF, or the unit may not start recording. 5 Press z. n is pressed simultaneously and recording starts. While the tape runs, the REC/BATT lamp lights and flashes depending on the strength of the sound. Recording level is fixed. At the end of the tape, recording stops and the unit turns off automatically (Automatic shut-off mechanism). To Press or slideStop recording Tx Pause recording Slide >PAUSE in the direction of the arrow.To release pause recording, release> PAUSE*. Start recording during z during playback (the unit enters the playback recording mode) Review the portion just Push up FF/CUE m-M REW/REVIEW recorded toward MREW/REVIEW during the recording. Release the button at the point to start playback. Take out a cassette Tx * > PAUSE will also be automatically released when Tx is pressed (stop-pause-release function). NoteSelect the 2.4 cm tape speed for recording, if you play back the recorde\ d tape with another unit. Otherwise, the sound quality may be changed. Notes on VOR (Voice Operated Recording)- The VOR system is affected by the environmental recording conditions. When you use the system in a noisy place, the unit will stay in the recording mode. If the sound is too soft, on the contrary, the unit will\ not start recording. If you cannot get the results you want, set it to O\ FF. - The VOR system may not record the beginning of the sound you want to record because it starts recording only after it catches the sound. F\ or an important recording, set it to OFF. VOL* n * > PAUSE Tx FAST PB . TAPE SPEED* FF/CUE m- M REW/REVIEW EAR E (Battery alert LED) * The button has a tactile dot. > PAUSE Tx EAR VOR TAPE SPEED*Tape counter z Tx Microphone REC/BATT FF/CUE m- M REW/REVIEW VOL* Tape counter reset button MIC (PLUG IN POWER)* E (Battery alert LED) * The button/jack has a tactile dot.