Nikon VBA23001 Repair Manual page 189

⑩ TFT adjustment
Flickering, color and luminance of TFT are adjusted.
※ Whenever the DG-PCB or TFT monitor are replaced, be sure to perform "WRITING THE TFT FIXED
VALUE."
Hue adjustment
Usually default value is set and adjustment is not necessary.
If some problem is found with hue by visual check, adjust and correct it by "+/-" button.
Brightness adjustment
Usually default value is set and adjustment is not necessary.
If some problem is found with brightness by visual check, adjust and correct it by "+/-" button.
⑪ Obtain reference value
・Sensitivity reference value calculation
Using the tool lens (F5.6), the reference body is faced to the color viewer (LV13 equiv.) with the ND filter (-7
steps) being put between them. Then, the G output average value of (425 pixels × 425 pixels), which was devi-
ated from the center by 425 pixels, is stored in the D90BSD.DAT file as the sensitivity reference value.
・Sensitivity ratio reference value calculation
Using the tool lens (F5.6), the reference body is faced to the shutter tester (LV 9 equiv.). Then, the sensitivity
ratio reference value GR and GB are calculated and stored in the D90BSD.DAT file, based on the G/R/B output
average of (425 pixels × 425 pixels), which is deviated from the center by 425 pixels.
It is necessary to calculate the reference values in order to prevent the color temperature fluctuation caused by
the shutter tester or color viewer's changes over time from affecting the results of the shooting image adjustment.
By using the reference body, calculate the reference values once in about every 3 months, when either of the
fluorescent of the color viewer or tool lens (F5.6) or ND filter (ND8X2) is replaced.
Device
D90 TOOL BODY
D1 STANDARD LENS
J61235
COLOR VIEWER
J61185
ND FILTER 8X
- A107 ･ D90 -
J63070
SHUTTER TESTER EF-1(CE)
J18191
ND FILTER 4X 2 pieces
INC
VBA23001-R.3762.A
J19123
J18358