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• Faulty symptoms and connected circuit blocks
Circuit blocks
Faulty symptoms
Circuit blocks
Faulty 'symptoms
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and probable causes
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and probable causes
c
0
0
0
0
o
Transmission buffer
0
0
o
+12V or -12V line deviates
is not empty.
over ±10%.
o
Control does not
(Causes)
return from the
o
Faulty TL497 AC.
transmission routine
o
Faulty 12N10K1.
in test program run.
o
Short circuited load.
(Causes)
o
Short circuited electrolytic
o
Hybrid IC doesn't
capacitor .
function normally.
• Other.
o!p clock is inoperative.
o
Wrong port address
selection.
• Abnormal 5V power
supply.
o
Othe~.
(
0
0
0
o
Error message is gener-
0
,0
Borate oscillator does not
ated from Z·80SIO
•
output.
(parity error, overrun
(Causes)
error, framing error,
o
Faulty MC14411.
etc.)
o
Faulty crystal.
(Causes)
o
Two or more dip switches
o
Wrong borate setting.
(SW-2, SW-3) turned on.
o
Abnormal borate
o
Faulty borate clock input
.
oscillator.
circuit of hybrid IC.
o
Wrong jumper set-
o
Other.
(
ting (J-1,J-2 and J-3)
o
Abnormal +12V or
-12V line.
o
Faulty connector.
o
Faulty counterpart
machine.
o
Other.
0
0
0
0
•
• Signal is not input.
c
-.
o
Control does not return
from input routine in
test program run.
(Causes)
o
Wrong borate setting.
o
Abnormal borate
oscillator.
o
Abnormal +12V or
-12V line.
o
Wrong jumper setting
(J-1, J-2 and J-3)
,
o
Faulty connector.
o
Faulty opel'1ltion of
hybrid IC.
o
FaUlty counterpart
,
machine.
(
• Faulty driver IC.
o
Other.
-
.. 0"
shows a related circuit.
.. 0"
shows a related circuit .
9
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