Electrical Components - Ricoh MP C307 Field Service Manual

Electrical Components

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The CPU board has a CPU, memory, and a flash drive.
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The Microcomputer board has various interfaces, Wi-Fi module and other devices.
Touch panel
The touch panel of this machine uses a 4-wire resistive film method (low load resistive film analog 4-wire
method). It can detect two points for flick/drag/pinch-in/pinch-out operations. Resistive touch panel has been
adopted in order to allow operation with a prosthetic hand.
Basic Structure
An analog 4-wire resistive film touch panel has 2 layers. Two materials (mainly film or glass) with transparent
conductive film (ITO) are attached such that the transparent conductive film layers face each other.
When the film is pressed with a finger or a pen, the transparent conductive films contact each other and the touch
panel operation is recognized.
Insulators (spacing dots) secure space between the two transparent conductive film layers to prevent short-
circuiting.
Because the transparent conductive film has a uniform resistance characteristic, the resistance value reflects the
distance of contact.
2.Mechanism
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