XG-C55X (serv.man12). Electrical adjustment - Sharp Projector Service Manual (repair manual). Page 6

21

Checking and
readjustment of
white balance

1. The adjusting conditions for each

item are as follows:
For RGB input, see Item 7.
For video input, see Item 14.
For COMPO input, see Item 17.

No.

Adjustment Items

Adjustment Conditions

Adjustment Procedures

1. Make sure the white balance is as

specified on the standard monitor.
For readjustment, proceed in the or-
der of RGB input, video input and
COMPO input.

22

Checking color-
related perfor-
mance

1. Receive the color bar signal.

1. Select L1 in the process mode.

Check the performance of Color and
Tint.

23

Checking of
picture-related
performance

1. Receive the monoscope pattern sig-

nal.

1. Select L2 in the process mode.

Check Picture, Brightness and Sharp-
ness.

24

Checking of RGB
performance

1. Receive the RGB signal.

1. Select L4 on the process mode.

Check Picture, Brightness, Red, Blue,
Clock, Phase, H-POS and V-POS.

25

Checking of off-
timer performance

1. Select OFF in the process mode.

Make sure that the off-timer starts
with 5-minute display, counts down
1 minute for 1 second, and turns off
when 0 minute is displayed.

26

Checking of
thermistor perfor-
mance

1. Heat the thermistor with a hair dryer.

1. Make sure the temperature is dis-

played.

27

Automatic sync
operation

1. Receive the phase checking pattern

signal.

1. Make sure that Clock, Phase, H-POS

and V-POS can be automatically
adjusted in the VGA/S-VGA/XGA
mode.

29

Factory settings

1. Make the following settings.

Process

Remote

Destination

adjustment

controller
settings

North-

      S4

Factory

American

Setting 4

Other

      S3

Factory
Setting 3

28

Vertical line level
check

1. Receive the RGB signal. 10-step

gray-scale

1. Compare with the vertical line bound-

ary sample, and it must be at the
boundary sample or less. In case that
it is bad, adjust the PSIG-L of the
item 3.
However, it must be within the range
of 190 - 200.

Gradation 2:

1. Upper-gradation correction value to be used.

Gradation 1:

1. Upper-gradation correction value to be used.

Gradation 0:

1. Upper-gradation correction value to be used.

For the model in question, select the name entered in (2) to start the color irregularity correction. If the
set has its optical characteristics rather different from the standard ones or if the set has some color
irregularity lines missing, do the teaching for that set in particular. Use its specified correction coeffi-
cients in making the adjustment.