Operation Panel - Ricoh FT7770 Service Manual

30 April, '89

Operation Panel

7.
The operation panel has five circuit boards: a ROM board, a CPU board,
two LED boards, and the key board.
ROM Board:
This board has 11 ROMs (32 kbyte each).
display data.
CPU Board:
This board controls all the other operation panel boards and communicates
with the main board.
LCD Boards:
These two boards contain the display LCDs, the LCD control circuits, and
the lamps which illuminate the displays. Both LCDs are lighted from behind
by cold cathode tubes.
The right LCD displays the machine condition indicators. These indicators
are fixed in size and position.
LCD and its lamp, which gives the indicators their colors.
The left LCD is a 256 x 64, dynamically controlled dot screen. It displays
machine conditions, operator guidance, and service information.
Key Board:
The key board takes all input from the user.
These ROMs hold the guidance
There is a four color filter between this
2-110