Pentax K100D Service Manual page 71

[Caution]
Position of histogram must be the following fig 2.
If the position of histogram is Fig1,Fig3 or Fig4 (NG), check the setting the camera again.
Also, re-adjust BV and digital adjustment.
NG
* Set same light value (LV8 or LV9) and Set aperture at F1.4 (Open position)
7) Set TV at 4000 and ISO 3200 (When set LV9: TV 4000 and ISO 1600)
8) Set the camera to the light box and capture 5 images
9) Playback the image by histogram display and compare the peak position with standard data.
and then measure the difference (mm) on the monitor.
[Caution] Confirms it from the position of the front to the LCD monitor and do not make scratch on LCD
monitor
< Example>
Standard
Tv250
(Tv500)
(+)
Tv4000
Playback the image (Histogram display)
10) Select the histogram zone (A~D) of the peak position of Tv 4000 from the below.
* In the case of above, the histogram zone is B
(Y) 0
OK
A B C D
64 128
76700 -70/94-
NG NG
(0)
A
64
Standard Tv4000
Minus side
+1.5 mm
Difference
(5/8) (7/8)
(1/4) (1/2) (3/4) (1)
B C D
80 104 120 128
96 112
Plus side