Specifications

5
WATCHDOG (CPU OVERRUN MONITOR) FUNCTION
5-1. Overview
The watchdog function monitors whether any of the CPUs mounted in the
copier overrun. If this function detects that a CPU overruns, the copier
automatically resets the CPU, thereby restarting the logic circuit and
mechanism.
Even if a copier CPU operates erratically due to electrical noise, therefore,
the copier is able to recover from the faulty condition so that the number of
visits made by the Technical Representative for CPU overrun can be
minimized.
5-2. Configuration
The copier has three printed-circuit boards each on which a CPU is mounted:
*
SCP (Scanner Control Processor) Board PWB-J that controls the optical
system;
*
MSC (Macro System Controller) Board PWB-B that controls the control
panel and system; and,
*
Master Board PWB-A.
In addition to these, each of the control boards for the Data Controller,
Duplexing Document Feeder, and Sorter/Staple Sorter is equipped with a
CPU.
The watchdog functions are summarized as follows:
*
Each of the copier CPUs monitors whether or not it overruns.
*
The PWB-B monitors the communications conditions of the CPUs in the
Duplexing Document Feeder and Data Controller.
*
The PWB-A monitors the communications conditions of the CPUs in the
Sorter and Staple Sorter.
Data Controller
Control Board
Duplexing
Document Feeder
Control Board (PWB-A)
Copier
SCP Board PWB-J
MSC Board PWB-B
Master Board PWB-A
Sorter, Staple Sorter
Control Board (PWB-A)
Board on which a
CPU is mounted
=
M-11