Sony xt v 70 service manual

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2 XT-V70 1. SERVICING NOTES ................................................ 3 2. GENERAL ................................................................... 4 3. ELECTRICAL ADJUSTMENTS .......................... 7 4. DIAGRAMS 4-1. Block Diagram (Except Russian model) ......................... 9 4-2. Block Diagram (Russian model only) ............................. 10 4-3. Printed Wiring Boards -“ TV Section (1/2) -“(Except Russian model) ................................................... 12 4-4. Printed Wiring Board -“ TV Section (2/2) -“ (Except Russian model) ................................................... 13 4-5. Schematic Diagram -“ TV Section -“ (Except Russian model) ................................................... 14 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. Flexible Circuit Board Repairing - Keep the temperature of the soldering iron around 270 ËšC 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. UNLEADED SOLDER Boards requiring use of unleaded solder are printed with the lead- free mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size) : LEAD FREE MARK Unleaded solder has the following characteristics. - Unleaded solder melts at a temperature about 40 °C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 °C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful! - Strong viscosity Unleaded solder is more viscou-s (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc. - Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder. 4-6. Schematic Diagram -“ TV Section (1/3) -“ (Russian model only) ...................................................... 15 4-7. Schematic Diagram -“ TV Section (2/3) -“ (Russian model only) ....................................................... 16 4-8. Schematic Diagram -“ TV Section (3/3) -“ (Russian model only) ...................................................... 17 4-9. Printed Wiring Boards -“ TV Section (1/2) -“ (Russian model only) ....................................................... 18 4-10. Printed Wiring Board -“ TV Section (2/2) -“ (Russian model only) ....................................................... 19 5. EXPLODED VIEW ................................................... 27 6. ELECTRICAL PARTS LIST ................................ 28 TABLE OF CONTENTS

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3 XT-V70 SECTION 1 SERVICING NOTES IC301 TV board SYNC board -“ SYNC board (Russian model) -“ -“ TV2 board (except Russian model) -“ If replacing the SYNC board, disconnect the SYNC board from the TV board, and clear off the remaining bond with a cutter, etc. and then apply the bond and install new board.In clearing off the remaining bond with a cutter, take care not to damage the board or mounted parts. If replacing the TV2 board, disconnect the TV2 board from the TV board,and clear off the remaining bond with a cutter, etc. and then apply the bond and install new board.In clearing off the remaining bond with a cutter, take care not to damage the board or mounted parts. To secure the SYNC/TV2 boards, a special bond is required. Pa rt. No. Description 7-432-912-48 SONY BOND SC608LV C330 C105 C153 C6 C47 IC403 TV board TV2 board F or the bond application locations. (SONY BOND SC608LV) F or the bond application locations. (SONY BOND SC608LV) F or the bond application locations. (SONY BOND SC608LV) For the bond application locations. (SONY BOND SC608LV) NOTES ON REPLACEMENT OF SYNC/TV2 BOARDS