Oki B 4100 Maintenance Manual page 458

A3.8 TELU, TEL-W2, TEL-W1, TEL-W2D and TEL-W2F Circuit Diagram (option)
TEL board is used for the control board of the telephone set when the optional telephone assembly is
installed on the facsimile transceiver, and TEL board is selected from TELU, TEL-W2, TEL-W1, TEL-
W2D and TEL-W2F because it differs depending on country's specifications. Therefore, the TEL circuit
diagram is destined for the following countries.
Note: The relationship between TEL and other boards (NCU, NTIF, HOOK, etc.) shows A3.
OKIOFFICE44/OKIFAX 4100/5000 series facsimile transceiver (page A3-101).
• TELU circuit diagram
US and Canada.
• TEL-W2 circuit diagram
Sweden, Finland, The Netherlands, Ireland, Portugal, New Zealand, Australia, Spain, Greece,
Switzerland and Austria.
• TEL-W1 circuit diagram
UK, Norway, Denmark, Belgium and Italy.
• TEL-W2D circuit diagram
Germany
• TEL-W2F
France
1. Block diagram
• Figure A3.8.1 shows a block diagram of TELU circuit.
• Figure A3.8.2 shows a block diagram of TEL-W2 circuit.
• Figure A3.8.3 shows a block diagram of TEL-W1 circuit.
• Figure A3.8.4 shows a block diagram of TEL-W2D circuit.
• Figure A3.8.5 shows a block diagram of TEL-W2F circuit.
2. General functions of this circuit are as follows:
• Speech IC
• Sending Level Adjustment
• Receiving Level Adjustment
• Sending Frequency Response Adjustment
• Side Tone Adjustment
• DC V-1 Characteristics Adjustment
• Return Loss Adjustment
• AGC (automatic gain control)
• Manual Pad
• Sending Frequency Response Adjustment
• Receiving Frequency Response Adjustment
• Pulse Dialing (for TEL-W1)
• MF Dialing (for TEL-W1)
• Charge Pulse Elimination Characteristics (for TEL-W2D)
• Handset Interface
40055101TH Rev.4
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