Sony WRT-807B, Service Manual

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2-5
WRT-807B (U/CE)
2-2-2. Note on Parts Replacement
.
EEPROM (IC202, DP-306 board) replacement
When replacing EEPROM (IC202) on the DP-306 board
or replacing DP-306 board, perform the following
operation.
When the power is turned on initially after the replace-
ment:
1. “Error 11” is indicated on the display.
2. Turn off the power. Next turn on the power again.
Confirm that “CE57B” (for CE57 model) is indicated
on the display.
Confirm that “CE62B” (for CE62 model) is indicated
on the display.
Confirm that “CE67B” (for CE67 model) is indicated
on the display.
Confirm that “U30B” (for U30 model) is indicated on
the display.
Confirm that “U42B” (for U42 model) is indicated on
the display.
Confirm that “U62B” (for U62 model) is indicated on
the display.
Confirm that “U66B” (for U66 model) is indicated on
the display.
2-3. 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
d
C
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.