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The serial interface card consists of six blocks and, if each block functions normally, a faulty operation is caused by an
external factor (Ex: program, the counterpart machine, etc.) •
• Circuit Blocks and Check of Behavior
..
.
Block
Circuit
Behavior
1
Hybrid
Z-80SIO is built in and
te~t
the function by the test program.
2
Port address
Check if an address code set by SW-1 (DIP switch) is output.
selector·
If the output does not agree, wired-or output is a low level.
3
Borate
Check if MC14411 is outputting.
oscillation
and setting
r - -
Frequencies are as follows:
F1 .. 153.6 KHz
F8 • 9,600 Hz
F3
..
76.8 KHz
F9 .. 4,800 Hz
F5
..
38.4 KHz
F11 .. 2,400 Hz
F6
..
28.8 KHz
F13· 1,758.8 Hz
F7
..
19.2 KHz
F14· 1,200 Hz
Be sure that two or more switches of SW-2 and SW-3 (DIP switch) are not turned
on. Tolerable deviations are ±0.1% for each frequency.
In measurement, consider that the waveform of MC14411 varies according to
the load capacity because MC14411 is CMOS.
4
Drivers,
Check the status of input signal.
jumpers,
• Output of 75188 }
High level: -10V to .... 12V
-
switches and
Input of 75189
Low level: 10V to 12V
connectors
•
Input of 75188
}
Ci9h: OV to 0.8V)
TTL level
Output of 75189
Low: 2.5V to 5V
•
If reset, the output terminal of the hybrid IC is in the high level (high level of
TTL level).
5
Power supply
Be sure that the voltage is +5V ± 5%.
• 5V line
Be sure that the oulput of DC-DC converter is:
• +12V line
+12V ±lO%, -12V ±10%
0
• -12V line
6
Bus interface
Since there is no circuit part, examine if the signal is input to the board
normally.
The hybrid IC is not actuated unless the clock signal is applied to the
q,
terminal
of the hybrid I C.
8
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