DCR-TRV145E/TRV147E/TRV245E/TRV250E
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
PUBLISHED BY SONY.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.
1. Check the area of your repair for unsoldered or poorly-solderedUnleaded solder
connections. Check the entire board surface for solder splashesBoards requiring use of unleaded solder are printed with the lead-
and bridges.free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
2. Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.the lead free mark due to their particular size.)
3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous re : LEAD FREE MARKpair. Point
them out to the customer and recommend their replacement.Unleaded solder has the following characteristics.
4. Look for parts which, through functioning, shoYw obUnleaded solder melts at a temperature about 40vious signs°C higher than
of deterioration. Point them out to the customer andordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
recommend their replacement.applied to the solder joint for a slightly longer time.
5.Check the B+ voltage to see it is at the values specified.
Soldering irons using a temperature regulator should be set to
6.Flexible Circuit Board Repairingabout 350°C.
YKeep the temperature of the soldering iron around 270uCCaution: The printed pattern (copper foil) may peel away if the
during repairing.heated tip is applied for too long, so be careful!
YDo not touch the soldering iron on the same conductor of theY Strong viscosity
circuit board (within 3 times).Unleaded solder is more viscous (sticky, less prone to flow) than
YBe careful not to apply force on the conductor when solderingordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
or unsoldering.
Y Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
N 4 N |
ACEC
