Panasonic UF-E1 Service Manual page 143

6.2.7. Panel Unit
The panel unit is composed of the liquid crystal display (LCD) module, a group of switches and LED's. The
control for these are conducted by MN195005 (IC15: one-chip facsimile engine) through PRC2 and input
and output ports.
Circuit Diagram
PNLD0-3
PNLR/W
MN195005
IC15
PNLALE
PNLDTE
RESET
S C
PNLD0-3
PNLR/W
PNLALE
PNLDTE
Operational Description
• The displays on the LCD are driven by a dedicated module. The controls for the display is conducted by
the instructions from MN195005 (IC15). By conducting register selection on the ASIC (IC1) installed on
the panel, MN195005 (IC15) controls the devices installed on the panel.
• LED is driven by IC1 directly. The display data information is directly controlled by MN195005 (IC15) on
the SC-side.
• The switch information is obtained from the matrix of 8×4-bit lines with an interval of about 2ms. This
information is obtained by scanning the matrix periodically by MN195005 (IC15) on the SC-side.
• MN195005 (IC15) on the SC-side and the ASIC (IC1) installed on the panel are connected with a 4-bit
parallel interface. Using PNLD0-3, PNLALE, PNLR/W, PNLDTE signals, register selection on the ASIC
(IC1) and reading and writing data are executed. The register selection is conducted by "low:L" section
for PNLR/W with the "low:L" edge of the PNLALE. Such operations as interfacing with LCD, LED control,
key-matrix control, and obtaining sensor information can be individually conducted by the register selec-
tion. After register selection, data is read in the "H" section of PNLDTE when PNLR/W is "H," and data is
written on the "L" edge of PNLDTE when PNLR/W is "L."
• Installed on the panel board are sensors for the original manuscript, scanning position, and door open/
close. Therefore, it is possible to take out information at any time, in addition to the key-matrix informa-
tion.
LCD0-3
LCDR/W
LCDDTE
LCDRS
KEY0-7
SWC0-3
DZACOOO218
ASIC
IC1
SEN0-9
LED0-7
Register
Selection
LCD
Key Matrix
(7 4)
ADFA ADFB
sensor sensor
LED 6 LED for back lighting
(LED 5)
Pa n el
DATA WRITE DATA READ
139
UF-E1
DOOR
sensor