Canon fax basic 2000 サービスマニュアル

A–8

Group delay 

distortion

The image signals become more dif-

ficult to receive just like as in atten-

uation distortion.

—

Level variation

Lines are missed if the variation is

significant.

Improve the S/N ratio.

• Increase the transmission level on 

the ATT switch of the SSSW.

• Slow down the transmission 

speed.

White noise

Lines are missed if the signal level is

low.

Improve the S/N ratio.

• Increase the transmission level on 

the ATT switch of the SSSW.

• Slow down the transmission 

speed.

Frequency offset

Control procedure may be inter-

rupted.

Improve the S/N ratio.

• Increase the transmission level on 

the ATT switch of the SSSW.

• Slow down the transmission 

speed.

Phase jitter

Lines may be missed if jitter is sig-

nificant.

Improve the S/N ratio.

• Increase the transmission level on 

the ATT switch of the SSSW.

• Slow down the transmission 

speed.

Impulse noise

The same phenomenon as white

noise and level variation occur.

Improve the S/N ratio.

• Increase the transmission level on 

the ATT switch of the SSSW.

• Slow down the transmission 

speed.

Short break

More conspicuous symptoms that

level variation and impulse noise

occur.

Countermeasures are difficult to

implement.

Phase hit

Lines are missed.

Improve the S/N ratio.

• Increase the transmission level on 

the ATT switch of the SSSW.

• Slow down the transmission 

speed.

Table A-1   Phenomenon Caused by Deteriorating Factors and Countermeasures

Deteriorating 

Factor

Phenomenon

Countermeasure