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F-42 F-42
TROUBLESHOOTING & REPAIR
MULTI-SOURCE
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ABNORMAL OPEN CIRCUIT VOLTAGE WAVEFORM
ONE OUTPUT SCR NOT FUNCTIONING - NO LOAD
0 volts
2 ms
50 volts
This is NOT the typical DC output volt-
age waveform. One output SCR is not
functioning. Note the “gap” in the wave-
form. One SCR gate is disconnected to
simulate an open or non-functioning out-
put SCR. Each vertical division repre-
sents 50 volts and each horizontal divi-
sion represents 2 milliseconds in time.
Note: Scope probes connected at
machine output terminals: (+) probe to
positive terminal, (-) probe to negative
terminal.
Volts/Div.......................50 V/Div.
Horizontal Sweep......2 ms/Div.
Coupling..............................DC
Trigger..........................Internal
Scope Settings