Sony mz r 91 service manual
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Extracted text from sony mz r 91 service manual (Ocr-read)
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– 2 – TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 3 2. GENERAL ................................................................... 4 3. DISASSEMBLY ......................................................... 5 4. TEST MODE .............................................................. 11 5. ELECTRICAL ADJUSTMENTS ......................... 18 6. DIAGRAMS 6-1. Block Diagram –SERVO Section–................................. 23 6-2. Block Diagram –A/D, D/A CONVERTER, AUDIO Section –............................................................ 25 6-3. Block Diagram –KEY CONTROL/DISPLAY/ POWER SUPPLY Section –........................................... 27 6-4. Printed Wiring Board ...................................................... 30 6-5. Schematic Diagram ......................................................... 33 6-6. IC Pin Function Description ........................................... 46 7. EXPLODED VIEWS ................................................ 53 8. ELECTRICAL PARTS LIST ............................... 57Flexible Circuit Board Repairing -Keep the temperature of the soldering iron around 270 ˚C dur- ing 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 dam- aged by heat. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. ATTENTION AU COMPOSANT AYANT RAPPORT À LA SÉCURITÉ! LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY. SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY.
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– 3 – NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK Never look into the laser diode emission from right above when checking it for adjustment. It is feared that you will lose your sight. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (LCX-2R) The laser diode in the optical pick-up block may suffer electro- static break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform mea- sures against electrostatic break-down sufficiently before the op- eration. The flexible board is easily damaged and should be handled with care. laser-tap OPTICAL PICK-UP FLEXIBLE BOARD SECTION 1 SERVICING NOTES - When repairing this device with the power on, if you remove the MAIN board or open the upper panel assy, this device stops working. In this case, you can work without the device stopping by fas- tening the hook of the open/close detect switch (S801) with tape. - This set is designed to perform automatic adjustment for each adjustment and write its value to EEPROM. Therefore, when EEPROM (IC802) has been replaced in service, be sure to per- form automatic adjustment and write resultant values to the new EEPROM. (Refer to Section 5 Electrical Adjustment. (page 18)) - Replacement of CXD2660GA (IC502) and CXR701080-013GA (IC801) used in this set requires a special tool. Therefore, they cannot be replaced. tape S801 MAIN board upper panel assy