Pattern Box; Optical Filter - Nikon coolpix7900 Repair Manual

7. Pattern box

Before using the pattern box, turn its power on to carry out "Aging" approx. 30 minutes: the color temperature should
be 3100 ± 20K by the adjustment with the color meter, and the luminance should be 900 ± 20cd/m
with the luminance meter. When using the pattern box and for a while after its power turns off, the lamp and its
surroundings are subject to high temperatures, so care should be taken when handling.
• Procedure for correcting Pattern Box
Note: Be sure to perform the aging correction.
1) Measure the measuring point (center of diffusion plate) with the Color Meter (J63081).
2) Adjust the pattern box so that the color temperature should be 3100 ± 20K by using "VR for adjustment of the color
temperature".
3) Measure the center of the diffusion plate with the Luminance Meter BM-3000 (J63068).
4) Adjust the pattern box so that the luminance should be 900 ± 20cd/m
5) Repeat from 1) to 4) So that the color temperature should be 3100 ± 20k and luminance should be 900 ± 20cd/m
VR for adjustment of
the color temperature
Power switch
8. Adjustments required when parts are replaced
Lens Unit

Optical filter

CCD
CP-1
○ Adjustment is necessary. × Adjustment is not necessary.
Lens Adj. AWB
○ ○
○ ○
○ ○
○ ○
- A39 ･ E7900 -
2 by using "Knob for luminance adjustment".
Knob for luminance
adjustment
Iris unit
CCD
USB
Defects
○ ×
○ ×
○ ×
○ ○
VAA46003-R.3659.A
by the adjustment
2
Diffusion plate
Area to be measured
Firmware Initial image
up data
× ×
× ×
× ×
○ ○
2