Canon fax basic 2000 サービスマニュアル

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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

 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