Sharp TM150 Service Manual page 29

DEN:
075
8-level gradation pattern (black & white pattern)
Comparing with an adjusted handset, click " b " or " c " to adjust the value
so that the same gradation pattern is displayed. Click "Save" and
confirm the pattern on the external display.
4-8-16. White defect correction
* White defect correction:
Defective pixels in a camera light sensor appear as bright points in the
display even when light is blocked completely (display is all black). Per-
form white defect correction to eliminate errors in these pixels.
1. Protect the handset camera from light completely with a black cover.
2. Click the "White defect correction" button. The following screen
appears.
TM150
Click the "Yes" button and leave it for about 20 seconds.
When completed, the following message appears.
TM150
When an error occurs, the corresponding message appears. Solve the
problem according to "Solution".
• Error 1
Error message : "There are too many white cracks."
Cause : The light is not sufficiently blocked.
Solution : Block the light completely and perform white
defect correction again.
• Error 2
Error message : "There are many white cracks."
Cause : The light is not sufficiently blocked.
Solution : Block the light completely and perform white
defect correction again.
• Error 3
Error message : "There are too many white cracks cannot be
rectified."
Cause : There is a hardware error.
Solution : Replace the camera unit.
CONFIDENTIAL
4-8-17. Black defect correction
* Black defect correction:
1) Requirements
2) Procedure
1. Cover the camera section with the black defect correction sheet as
2. Check the distance from the fluorescent lamp by using an illumi-
TM150 ADJUSTMENTS, PERFORMANCE CHECK, AND FIRMWARE UPGRADE
2 – 23
DRAFT
Defective pixels in a camera light sensor appear as black points in the dis-
play even when a captured image is completely white (display is all white).
Perform black defect correction to eliminate errors in these pixels.
• Desk top type of fluorescent lamp
• Black defect correction sheet
• Illuminance meter
shown in Figure 96.
Attach the Black defect correction sheet
to the handset firmly with clear scotch tape.
nance meter.
In the proper position for black defect correction, illuminance is
between 8,000 and 10,000 lux.