Detailed Description
8500C/8500C+ System Maintenance Manual
4-7
Figure 4-3. Digital Board Block Diagram
j.
Keypanel. The user interacts with the Balancer/Analyzer System through the 32-switch
keypanel. 28 of the keys have fixed functions. The functions of the remaining four keys
(soft keys) vary as determined by the system’s mode of operation.
k.
Keypanel Filter. The keypanel filter is on the digital board near keypanel input. The filter
contains four low-pass filters which reduce the high frequency energy on four keypanel
scan lines to reduce keypanel emissions.
CONTROL
COMMANDS
TO ANALOG
BOARD
TIMING
CONTROLLER
TO/FROM
PRINTER
BOARD
PULSE
DETECTOR
MAGNETIC
PICKUP
SIGNAL
INPUT FROM
8520C
COMMUNICATIONS
CONTROLLER
SERIAL
COMMUNICATIONS
TO/FROM 8520C
LCD
TO/FROM
DISK DRIVE
KEYPANEL
VELOCIMETER
SIGNAL
FROM ANALOG
BOARD
DIGITAL
LOW-PASS
FILTERS
68008
MICRO-
PROCESSOR
TIME-TO-
FREQUENCY
CONVERTER
MEMORY
REALTIME
CLOCK
FILE: FIG4-3.DRW
