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FACSIMILE SYSTEM
A varistor is used as the protective circuit for overcurrent.
Though varistors normally do not allow current to pass, they turn the CML
relay
ON when a high-voltage CI arrives from the telephone line, and so
the current is allowed to escape to the line to protect the circuit elements
from voltage rise.
Fig. 6-15 Overcurrent Protection (varistor)
ON
ON
CML relay
Varistor
P relay
DC seize
circuit
L1
L2
S relay
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