Color inaccuracy in D40

Try pushing the menu button and selecting "shooting menu". There you should find options for: Image Mode, Whire Balance, Continuous Shooting, ISO, and Color options.
Setting the White Balance to "Auto" actually produces the most accurate and reliable results.

Default your options to factory settings to see if the white balance setting or a type of light setting is wrong.

change your black toner... if it doesn't work.. then change black developer... still doesn't work then change black drum...

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d

The Fuji S2 sensor is noted for this red sensitivity. Here's a few different approaches to getting the shot with the S2, all of which require some experimentation.

1. Set the "Color" and "Tone" Function options to "ORG". Underexpose the shot. Progressively change the exposure compensation downward until when checking the histogram, the red channel does not show saturation at the high end. Advantages: this is the simplest approach to getting the picture. Disadvantages: the S2 already had a fairly limited dynamic range, and this will make things worse for the parts of the photo that are not red. For the surgical setting and use of a ringflash, this may not be much of a disadvantage, since a lot of the stuff of interest will be red, and ringflash illumination generally is of lower contrast than directional lighting.

2. Set the "Color" and "Tone" Function options to "ORG". Use a custom white balance. The idea here is to have the camera adjust the red channel sensitivity itself, and leave the blue and green channels alone. To do this, start with several sheets of white paper and a red or pink marker or highlighter. Scribble with the marker across a sheet, then use that to set a custom white balance. Take a test shot of the red stuff that has been problematic, and see whether the histogram for the red channel shows that there is no saturation at the high end. Repeat this with progressively more red or pink on each sheet used to set the custom white balance until you find the custom white balance that takes enough of the edge off the red channel response. Alternative: I just tried out making a gradient across an 8.5x11" sheet of paper going from white to about 30% red saturation. I can set more or less red adjustment in a custom white balance just by pointing the camera at different parts of the page. This seems to work OK for me. Advantage: can allow the full dynamic range of the sensor to be used. Disadvantages: the experimentation period is likely to take a while to get the best results, and the final images are unlikely to look completely natural.

3. Set the "Color" Function option to "B/W". Use a green or cyan filter on the lens to cut the amount that the red color channel contributes to the final image. Advantages: this is fairly simple as an approach. A similar post-processing technique can be applied to the photos that you already have, by nulling out the red channel contribution and desaturating the blue and green channels to produce a grayscale image. Disadvantages: you lose the color information entirely. Since much of what you want information about is colored red anyway, the organs are likely to appear quite dark when only taking the blue and green channel contributions to the image.

When did you get this message? It seems like you have set the White Balance of the camera wrong. Set it to Auto White Balance to eliminate this problem. Use Daylight White Balance when shooting in bright daylight so as to eliminate any color cast in the image.

You CAN!!! shoot in b/w with a d40, the only thing is you can't shoot in auto mode it has to be manual , aperture priority, or shutter prioirity. Go into menu - shooting mode - optimize image. you'll find it in there.

i do not understand -/+ button and reading tell me in the simple language.My question is in white colour bird feathers are always very bight i can not see the detail in it how i cam solve this problem if i increase the shutter and apperture the picture became dark.

white balance can only be manually configured on "PSM" modes only, the other modes set the white balance automatically .

Colorimetre HCFR software
AVC HD 709 calibration disk
Spyder2 colorimeter (I know most prefer the Eye-One meters, but the Spyder2 was available from my job at no cost)

Here are the settings:

PS3 Blu-Ray player

Output Format (HDMI): Y Pb/Cb Pr/Cr (important!!! NOT RGB output)
BD 1080p 24hz Output (HDMI): On (this TV can reproduce video at 48hz for accurate 2:2 pulldown)
Y Pb/Cb Pr/Cr Super White (HDMI): On (not sure if this matters)

42LG50 Settings

Aspect Ratio: Set By Program (Personal Preference)
Picture Mode: Expert 1
Backlight: 50 (Personal Preference)
Contrast: 54
Brightness: 54
Sharpness: 40 (Personal Preference)
Color: 50
Tint: 0

Fresh Contrast: Off
Noise Reduction: Off
Gamma: Medium
Black Level: Low
Real Cinema: On

White Balance: Warm
Method: 10 Point IRE

10 (-3,8,-16)
20 (15,24,-21)
30 (20,36,-22)
40 (3,19,-40)
50 (8,34,-41)
60 (10,50,-20)
70 (-5,50,-8)
80 (-16,50,18
90 (-14,50,30)
100 (-22,38,21)

Red Color: -3
Red Tint: 0
Green Color: 10
Green Tint: 0
Blue Color: 14
Blue Tint: 0
Yellow Color: 0
Yellow Tint: 1
Cyan Color: -11
Cyan Tint: 0
Magenta Color: 0
Magenta Tint: -2

Take time to get used to the settings, you may think the screen looks dull at first. The truth is most people have way too much contrast on their TVs.
These settings will also work for Cable or Dish hookups, in which case you may change the Noise Reduction option to Medium to reduce signal noise.

OR....

2POINT IRE

Backlight: 65
Contrast: 55
Brightness: 45
Sharpness: 50
Color: 45
Tint: 0

Fresh Contrast: Off
Noise Reduction: Off
Gamma: Medium
Black Level: Low
Real Cinema: On

White Balance: Warm
Method: 2 Point

Red Color: 3
Red Tint: 0
Green Color: 9
Green Tint: 2
Blue Color: -1
Blue Tint: 0
Yellow Color: 6
Yellow Tint: 5
Cyan Color: -1
Cyan Tint: 1
Magenta Color: 2
Magenta Tint: -1

Your white balance setting is too warm. Try setting a custom white balance or move your current white balance towards the "Tungsten" end. "Cloudy" is a good start.