Interlock Switch; Unleaded Solder; Notes For Replacing Parts - Sony UP-55MD Service Manual

1-5-12. Interlock Switch

1. Remove the top cover. (Refer to Section 1-3-1.)
2. Remove the front panel assembly.
(Refer to Section 1-3-2.)
3. Remove the MA-142 board. (Refer to Section 1-4-1.)
4. Remove the mechanical main unit assembly.
(Refer to Section 1-5-2.)
5. Remove the two screws, then remove the interlock
plate and SE-755 board.
6. Disconnect the harness from the connector on the SE-
755 board.
7. Attach the interlock switch in the reverse order of
steps 1 to 6.
UP-55MD
SE-755 board
TO MA-142
CN203
BVTT
2.6 x 5
Interlock plate

1-6. Unleaded Solder

Boards requiring use of unleaded solder are printed with a
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
m
. Be sure to use the unleaded solder for the printed circuit
board printed with the lead free mark.
. The unleaded solder melts at a temperature about 40 dC
higher than the ordinary solder, therefore, it is recom-
mended to use the soldering iron having a temperature
regulator.
. The ordinary soldering iron can be used but the iron tip
has to be applied to the solder joint for a slightly longer
time. The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful.

1-7. Notes for Replacing Parts

There are two kinds of types (gold and silver) in the parts
below used in this unit.
. Flexible card wires
. Boards
. Connectors on the board (for flexible card wires)
Be sure to use the specified parts. Using un-specified parts
causes the change in the characteristics of this unit and the
unit does not work properly.
Spare parts are listed in the spare parts list of "Spare Parts"
Section (Volume 2). In the spare parts list, (GOLD) or
(SILVER) is put after each part name to distinguish two
kinds of types (gold and silver).
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