XG-MB67X (serv.man14). Electrical Adjustments - Sharp Projector Service Manual (repair manual). Page 2

XG-MB67X

7 – 2

Check items

1

Adjustment of RGB brightness

1. Select the following group and subjects.
Group : CONFIRM/AD
Subject : R-BRIGHT
               G-BRIGHT
               B-BRIGHT
(Process GAMMA interlock)

1. Check the fixed value.
Fixed value : 127

2

Adjustment of Component offset

1. Feed 10-step signal with 480P component 
100% amplitude.
2. Select the following group and subjects.
Group :CONFIRM/AD
Subject : C-R-OS
               C-B-OS
(Process GAMMA interlock)

1. Check the fixed value.
C-R-OS : 260
C-B-OS : 260

3

Adjustment of DLP Brightness

1. Select the following group and subject.
Group : CONFIRM/DLP
Subject :R-BLK
              G-BLK
              B-BLK
(Process GAMMA interlock)

1. Check the fixed value.
Fixed value : 256

4

Video Contrast adjustment

1. Feed NTSC 100% wind pattern signal. 
(Signal with burst)
2. Select the following group and subjects.
Group : CONIRM/
              VIDEO
Subject : V-CONT

1. Check the fixed value.
Fixed value : 124

5

Adjustment of Video Brightness

1. Feed NTSC 100% wind pattern signal. 
(Signal with burst)
2. Select the following group and subject.
Group : CONFIRM/VIDEO
Subject : V-BRIGHT

1. Check the fixed value.
Fixed value : 68

6

Adjustment of Video Tint

1. Feed split color bar.
2. Select the following group and subject.
Group : CONFIRM/VIDEO
Subject : V-HUE

Check the fixed value.
Fixed value : 128

7

Adjustment of Video color satura-
tion

1. Select the following group and subject.
Group : CONFIRM/VIDEO
Subject : V-COLOR

1. Check the fixed value.
Fixed value : 154

8

RGB tone reproduction adjust-
ment

1. Feed the SMPTE pattern signal.

1. Make sure the 100% and 95% white as well as the 
0% and 5% black gradations are visible.

9

VIDEO white balance adjustment

1. Feed the 50% gray signal.
2. Select the following group and subjects.
Group :CONFIRM/VIDEO
Subject : V-R-OS
                  V-B-OS

1. V-R-OS is 132.
V-B-OS is 132.

10

White balance checking and 
readjustment

1. RGB Inputt
sRGB Input
VIDEO Input
DTV Input
DVD Input

Check that there is no deviation of white balance with 
the monitor.

11

Off-timer performance

1. Select the following group and subjects.
Group :CONFIRM/CHECK
Subject : TEMP-OFF

1. Select OFF from the process mode. Make sure the 
off-timer starts with 5 minutes onscreen and count 
one minute in one second. And then indication is 0 
minute, the power supply of the set is cut off.

12

Thermistor performance checking 1. Heat the thermistor with a hair dryer.

1. Make sure that the temperature is indicated. 

13

Auto sync performance checking

1. Feed the phase check pattern signal.

1. In the VGA, SVGA, XGA and SXGA modes, make 
sure the Clock, Phase, H-Pos and V-Pos settings can 
be automatically adjusted.