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WJ-87I8A/MFP
Figure 3-2. Optical Encoder Timing Diagram
FIGURE 3-2
The amplifiers will drive standard 600 ohm stereo or mono headphones. If mono
headphones are used, LSB in the ISB mode will not be monitored.
3.1.2.2
Type 794309-X Front Panel Switchboard (MFP-A1A2)
Figure 6-4 is the schematic diagram for the Front Panel Switchboard and contains
the switch matrixes and
all
front panel LED displays and indicators. The switches, and the LED
indicators and displays associated with the switches,are organized into two groups. Each group
has a dedicated, programmable interface circuit on the MFP-A1A1 board, described in
paragraph 3.1.3.
3.1.2.2.1
Group 1 Switch Matrix (51 Through 520)
Keypad buttons SI through S16, tuning resolution buttons S18 through S20, and LCK
key S17 form the 4 x 5 Group 1 switch matrix.. The KCO through KC4 column scan lines and the
KRO
through
KR3
row
output
lines
are
connected
to
the
Group 1 programmable
keyboard/display interface circuit (MFP-AIAI UI). A closed switch connects the column scan
line with the row line; the interface senses this closed switch, codes the position, and stores the
code in a memory area which the microprocessor monitors during the execution of its program.
A detailed description of MFP-AIAI
VI
can be found in paragraphs 3.1.3.3 and 3.1.3.4.
3.1.2.2.2
Group 2 Switch Matrix (521 Through 556)
The 8 x 8 Group 2 switch matrix (S21 through
556)
contains aU front panel switches
except the power switch and the switches in Group 1. The BRO through BR7 row output lines
3-5
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