Sony rm ax 4000 a service manual

Page 1

2 RM-AX4000A TABLE OF CONTENTS 1. GENERAL ................................................................... 3 2. DISASSEMBLY 2-1. CASE (Lower) ................................................................. 7 2-2. KEY Board and LCD Section ......................................... 7 2-3. MAIN Board and LCD Module ...................................... 8 3. TEST MODE ............................................................... 9 4. DIAGRAMS 4-1. Block Diagram – MAIN Section – .................................. 12 4-2. Printed Wiring Board – MAIN Board – .......................... 13 4-3. Schematic Diagram – MAIN Board – ............................. 14 5. EXPLODED VIEWS ................................................. 17 6. ELECTRICAL PARTS LIST .................................. 18 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. 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. Operating instructiondd