General Description Of Led Print Head - Toshiba e-STUDIO 2555C Service Manual

3.9.2

General description of LED print head

An LED print head, which uses an LED (light-emitting diode) as a light source, is equipped for each
color, Y, M, C and K.
The LED light from the LED print head is emitted to the drum through a lens.
A gap between the LED print head and the drum in each color is kept constant with an LED gap spacer.
If this gap is not at the specified value, a focus error may occur, resulting blurring on images.
Therefore an LED gap spacer is a PM part due to possible difference in the gap caused by friction.
Also a dirty lens may cause image troubles such as blurring.
[3]
[2]
[1]
[1] LED print head
[2] LED gap spacer (front/rear)
[3] Drum
[4] LED
[5] Lens
*An LED and a lens cannot be disassembled as they are the components of an LED print head.
Two harnesses are connected to each LED print head from the LGC board.
One is for power supply and the other is for control signals.
If any of them is disconnected (or has a loose connection), an error or image trouble may occur.
LGC Board
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[3]
[5]
[4]
[1]
Fig. 3-27
5V Power
LED print head-Y
Contorol signal
5V Power
LED print head-M
Contorol signal
5V Power
LED print head-C
Contorol signal
5V Power
LED print head-K
Contorol signal
Fig. 3-28
3 - 49
e-STUDIO2555C/3055C/3555C/4555C/5055C
OUTLINE OF THE MACHINE
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