Sony SDM-N80 Service Manual page 24

• Adjustment of white balance (Digital input)
1. Adjustment of 9300K
(1) Receive MODE 29 (1280x1024 60Hz) 80IRE with digital input. Set SOURCEID1=10h.
(2) Set R_USER_DRV=230.
Set R_USER_BKG=132.
(3) Make adjustment with G/B_USER_DRV to set the chromaticity within specification.
x adjustment ..... Make adjustment with B_USER_DRV.
(The value y also changes.)
B_USER_DRV UP
B_USER_DRV DOWN Values x and y increase.
y adjustment ..... Make adjustment with G_USER_DRV.
G_USER_DRV UP
G_USER_DRV DOWN Value y decreases.
Spec: 9300K (x, y) = (0.285, 0.298)
Within 3JND at 80IRE
9300K (x, y) = (0.277, 0.287)
Within 4JND at 20IRE
Note: Make adjustment up to 0.002.
(4) Make the signal 20IRE all white to check that it is within the specification.
(5) Input a gray scale to check the picture quality.
(5) (4) If out of specification, adjust the R/B_USER_BKG so as to satisfy the specification.
(6) Input a gray scale to check the picture quality.
2. Adjustment of 6500K
(1) Receive MODE 29 (1280x1024 60Hz) 80IRE with digital input. Set SOURCEID1=11h.
(2) Set R_USER_DRV=220.
Set R_USER_BKG=128.
(3) Make adjustment with G/B_USER_DRV to set the chromaticity within the specification.
x adjustment ..... Make adjustment with B_USER_DRV.
(The value y also changes.)
B_USER_DRV UP
B_USER_DRV DOWN Values x and y increase.
y adjustment ..... Make adjustment with G_USER_DRV.
G_USER_DRV UP
G_USER_DRV DOWN Value y decreases.
Spec: 6500K (x, y) = (0.314, 0.328)
Within 3JND at 80IRE
6500K (x, y) = (0.298, 0.317)
Within 4JND at 20IRE
Note: Make adjustment up to 0.002.
Values x and y decrease.
Value y increases.
Values x and y decrease.
Value y increases.
(4) Make the signal 20IRE all white to check that it is within the specification.
(5) Input a gray scale to check the picture quality.
(5) (4) If out of specification, adjust the G/B_USER_BKG so as to satisfy the specification.
(6) Input a gray scale to check the picture quality.
3. Adjustment of 5000K
(1) Receive MODE 29 (1280x1024 60Hz) 80IRE with the digital input. Set SOURCEID1=12h.
(2) Set R_USER_DRV=215.
Set R_USER_BKG=130.
(3) Make adjustment with R/B_USER_DRV to set the chromaticity within the specification.
x adjustment ..... Make adjustment with B_USER_DRV.
(The value y also changes.)
B_USER_DRV UP
B_USER_DRV DOWN Values x and y increase.
y adjustment ..... Make adjustment with G_USER_DRV.
G_USER_DRV UP
G_USER_DRV DOWN Value y decreases.
Spec: 5000K (x, y) = (0.345, 0.358)
Within 3JND at 80IRE
5000K (x, y) = (0.316, 0.335)
Within 4JND at 20IRE
Note: Make adjustment up to 0.002.
(4) Make the signal 20IRE all white to check that it is within the specification.
(5) Input a gray scale to check the picture quality.
(5) (4) If out of specification, adjust the G/B_USER_BKG so as to satisfy the specification.
(6) Input a gray scale to check the picture quality.
4. Data copy to USER
Set SOURCEID1=13h and copy the data of R/G/B USER DRV and R/G/B USER BKG of
SOURCEID1=11h (Adjustment of 6500K).
Values x and y decrease.
Value y increases.
SDM-N80 (E) 2-3