Sharp AN-S422U, Service Manual

Page: 29 / 166

29
XG-V10WU
AN-SD1U/S422U
ELECTRICAL ADJUSTMENT
Hook up a signal generator, or a DOSV or Mac personal computer to the projector in order to feed the
signals specified in the Adjusting conditions.
No. Adjusting point Adjusting conditions Adjusting procedure
1 EEPROM
initialization
1. Turn on the power (with the
lamp on) and warm up the
set for 15 minutes.
»
Make the following settings.
Press S2601 to call the process mode. Execute
the S2 and S4 commands on the SSS menu. With
the S2 command, all but the PC boards will be
initialized. Do not execute the S1 command
because this will get the PC boards initialized. To
readjust the PC boards, refer to "Adjusting the PC
interface" on page 37.
2 RGB drive
adjustment 1. Feed the 100% white sig-
nal.
2. Select the following group
and subjects.
Group : A/D
Subject : R-D (R)
G-D (G)
B-D (B)
»
Using the set's control switch or the remote
controller's button, adjust the settings so that there
be some bit dropouts.
3 RGB1 system
black level
signal amplitude
adjustment 1. Select the following group
and subjects.
Group : OUTPUT1
Subject : G1-BLK
G1-GAIN
For the R and B colors,
choose the following re-
spective subjects.
R1-BLK and R1-GAIN for R
B1-BLK and B1-GAIN for B
2. Make sure the process ad-
justment color bars are be-
ing displayed.
3. Connect the oscilloscope to
pin (3) (for G) of P1001.
4. Similarly connect the oscil-
loscope to the following for
the R and B colors.
Pin (1) of P1001 for R
Pin (5) of P1001 for B
»
Select G1-GAIN. Using the set's control switch or
the remote controller’s button, adjust the setting so
that the signal amplitude be 3.7 ± 0.05 Vp-p.
»
Select G1-BLK. Using the set’s control switch or
the remote controller’s button, adjust the setting so
that the white to white level be 2.4 ± 0.05 Vp-p.
»
Do the same for the R and B colors.
3.7Vp-p
2.4Vp-p
`
The G1 settings affect all the R, G and B signals
at the same time. When the G1-BLK setting has
been changed, therefore, the R1-BLK and B1-BLK
settings are accordingly modified. Also with a
change in the G1-GAIN setting, the R1-GAIN and
B1-GAIN settings are accordingly modified. In
other words, adjust the G settings first and then
the R as well as B settings.