Operation Unit - Ricoh FT8680 Service Manual

OPERATION UNIT

17. OPERATION UNIT
[A]
[C]
[B]
32
[E]
A CRT (9 inches) [A] and a touch panel are used to achieve easy machine
operation.
The touch panel consists of a transparent film [B] and a glass sheet [C] on
which transparent matrix conductors (32 x 25 lines) are printed. The main
PCB scans these matrix lines and detects the touched location on the panel.
Messages are displayed on the CRT by a CPU (16 bit) using two control
ROMs and one character generator ROM on the operation unit PCB [D].
The auto response sensor [E], which is an infrared rays reflective sensor,
detects if there is an operator in front of the copier. If the auto response
sensor has not detected any objects for a certain time, the main PCB turns
off the CRT display to save the power consumption and to extend the CRT
life. The time setting can be changed by the user tools.
The operation unit PCB also controls the key panel [F] and communicates
with the main PCB through the serial interface lines.
25
[F]
2-126
[D]
CGROM
CPU
ROM1
ROM0
Serial Interface
Main PCB
31 July 1995
IC131
IC137
IC138
A171D687.img