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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
