Unleaded Solder; Service Know-How; When The Optical Unit Assy Is Replaced; When The Board Is Replaced - Sony VPL-VW50 Service Manual

1-4. 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.

1-5. Service Know-How

1-5-1. When the Optical Unit ASSY is
Replaced
1. Write the Look Up Table/3D gamma data contained in
the attached floppy disk.
See "1-6. Writing Look Up Table/3D gamma/DDC
data" for more about how to write data.
2. Perform white balance adjustment. (See "2-3. Servic-
ing White Balance Adjustment")
3. Change the IRIS data to the values of the IRIS adjust-
ment data stored in the supplied floppy disk. For how
to change the data, refer to "1-5-3. IRIS Copy".
1-20

1-5-2. When the Board is Replaced

1) When the Q board is replaced
a) Change the IRIS data to the values of the IRIS
adjustment data before replacement. (For the
method to change the IRIS data, refer to "1-5-3.

IRIS Copy".)

b) Change the W/B data to the values of the W/B
adjustment data before replacement. (For the
method to change the W/B data, refer to "1-5-4.

W/B Copy".)

When the adjustment data cannot be copied, adjust
W/B. (Refer to "2-3. Servicing White Balance
Adjustment".)
2) When the F, GA, or GS board is replaced
No particular adjustments are needed.
3) When the GB board is replaced
Remove IC700 from the old GB board, and install the
removed IC700 to the new GB board that is supplied
as the repair part, before replacement.
4) When the C board is replaced
Remove IC301 and IC401 from the old C board and
install them to the new C board that is supplied as the
repair part, before replacement.
1-5-3. IRIS Copy
1. Enter the Service Mode. (Refer to "2-1-2. How to
Enter the Service Mode".)
2. Set OTHER: 01 Iris Adj in the Device Menu to 1.
3. Change the value of OTHER: 02 Iris/Open_Reg.
4. Change the value of OTHER: 03 Iris/Close_Reg.
5. Return OTHER: 01 Iris Adj in the Device Menu to 0.
6. Perform Save to Memory.
1-5-4. W/B Copy
1. Input the 1080/60i flat-field (three RGB colors) to the
component terminal.
2. Enter the Service Mode. (Refer to "2-1-2. How to
Enter the Service Mode".)
3. Enter the W/B mode in the Device Menu.
4. Change the values of Gain R/G/B and Bias R/G/B in
each mode (High/Middle/Low/User1/User2/User3).
5. Perform Save to Memory.
6. Input the computer signal to input A, and copy all the
W/B adjustment values just as for Component.
* W/B data has a memory for each of the three IRIS modes (AUTO1/2,
Manual, and OFF). Perform the above steps for each IRIS mode.
VPL-VW50