Konica Minolta bizhub C658 Service Manual page 1784

bizhub C658/C558/C458/C368/C308/C258
[1] Light guide
[3] Original
[5] Direct light
(2) bizhub C658/C558/C458
• LEDs (Light Emitting Diodes) are used for the light source of the scanner section for power saving.
• Each LED board on either side has one LED, so that two LEDs illuminate.
• Light emitted from the LED travels along the light guide.
• The original is irradiated with direct light that has traveled along the light guide and indirect light reflected from the reflector, which
ensures that the original is exposed to steady, uniform light.
[7]
[6]
[1]
[7]
[1] Light guide
[3] Original
[5] Indirect light
[7] LED board
2.3.2 When the power is ON
1. When the power is turned ON, the LED lights up.
2. The LED exposure unit moves to the home position.
3. The LED exposure unit moves from the home position to the shading position (under the shading correction sheet).
4. The gain value of the CCD sensor output voltage to R, G, and B is adjusted.
5. After adjusting the gain value, a shading correction is performed.
6. The LED exposure unit moves in the return direction and stops at the home position.
7. When the DF is raised for placement of the original, the LED exposure unit moves to the original size detection position.
[2]
[1]
[1]
[5]
[6]
[4]
[5]
[6]
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 2.
[3]
[4]
[1]
[2] LED board
[4] Original glass
[6] Reflective mirror
[3]
[2]
[1]
[2] Original glass
[4] Direct light
[6] Reflector
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O-9
SCANNER SECTION