Xerox WorkCentre 385, Service Manual

Page: 175 / 184

OPE PBA
12/98
7 - 41
WorkCentre 385
OPE PBA
OPE PBA is separated functionally from the main
PBA and operated by the micom(Z8601) in the
PBA. OPE and the main use UART (universal
asynchronous receiver/transmitter) channel to
exchange information. OPE reset can be
controlled by the main. OPE micom controls key-
scanning and LCD and LED display, detects
documents and senses SCAN position. If there
occurs an event in OPE (such as key touch and
sensor level change), it sends specific codes to
the main to respond to the situation and the main
analyzes these codes and operates the system.
For example, if the main is to display messages in
OPE, the main transmits data through UART line
to OPE according to the designated format and
OPE displays this on LCD, LED. OPE’s sensing is
also transmitted to the main through UART line
and then the main drives necessary operation.
OPE PBA consists of U1 (MICOM, Z8601), LCD,
key matrix, LED indicators, SCAN position sensor
and the document detect sensor. Refer to OPE
Schematic Diagram and Wiring Diagram sections
of this manual.
• Signals from the key matrix are delivered to
U1X/Y input pin group (P1-x).
• U1 pin 4 (TX DATA) is the UART code sent to
MAIN PBA.
• Display from the controller is received at U1
pin 5 (RX DATA).
• LCD drive signals are sent from U1 P2-x pin
group, P3-4~P3-6 pins.
• Machine status LED drive signals are sent
from U1 P0-x pin group.
• Document detect sensor output is received at
U1 pin 33 (P3-3).
• Scan position sensor output is received at U1
pin 43 (P3-1).
FIG. 7-13: OPE BLOCK DIAGRAM
SCAN
POSITION
SENSOR
DOCUMENT
DETECT
SENSOR
CONNECTOR
MICROM
Z8601
RESONATOR
7.37 MHz
LCD
16x2 LINES
KEY MATRIX
LEDs
Y
8
X
7
11
UART 2
RESET
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