3
NW-HD5
SECTION 1
SERVICING NOTES
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 viscous (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.
•
Replacement of CXR704060-201GA (IC1003),
S1R72003BOOA100 (IC2001), CXR710160-213GH
(IC3001), CXD1616GH (IC7001), MT48H8M16LFB4-10
(IC7002) and SC901584EPR2 (IC9003) used in this set
requires a special tool.
•
When IC1101 and IC1102 (IC1102 is mounted only E, Taiwan,
Korean, Chinese and Tourist models) on the MAIN board are
damaged, exchange the new MAIN board for the MAIN board
which IC damaged.
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