Oki B 4100 Maintenance Manual page 479

Facsimile transceiver

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Table of Contents

TEL-W1 circuit diagram

Note: For each country's hardware parameter comparison table refer to page A3-88.

General functions of the speech IC are as follows:

• Basic speech functions included.

• Separate receive pre-amplifier with signal output terminal

• Separate receive power amplifier input terminal.

• Balanced input for microphone input to provide immunity to common mode noise.

• MF pre-amplifier input terminal.

• Dial pulse waveform improvement circuit included.

• Manual pad function included.

• The transmit, receive, and DTMF amplifier are provided with AGC in accodance with

Sending Level Adjustment

The sending level is adjusted by the selection of resistors allocated for individual countries

by the dip-switch settings. The dip-switch set to ON corresponds to the country as shown

in the table below.

• Increase the resistor value to set louder sending level (i.e. lower SLR value).

• Lower the resistor value to set quieter sending level (i.e. higher SLR value).

Receiving Level Adjustment

The receiving level is adjusted by the selection of resistors allocated for individual coun-

tries by the dip-switch settings. The dip-switch set to ON correspond to the country as

shown in the table below.

• Lower the resistor value to set louder receiving level (i.e. lower RLR value).

• Increase the resistor value to set quieter receiving level (i.e. higher RLR vallue).

40055101TH Rev.4

the line current.

Troubleshooting