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KX-T4330
m@ ICM MESSAGE RECORD CIRCUIT
Circuit Operation:
(Recording signals)
Recording signal from the telephone line or MIC is selected by IC4.
The recording signal flows as follows:
Mic-3C92, R87—!C4 Pin 191C4 Pin 15-R913C941C4 Pin 16-IC4 Pin 1»C91—ICM Head
Tel line+R95, C88-IC4 Pin 20.
(Signal)
The beep tone is generated by IC9.
The beep tone of the ICM recording (from Pin 56 of IC9) is processed in the ICM recording head via C107 and R105.
(Erase)
When in the Rec mode, Pin 14 of IC9 is High.
The voltage is applied to the Erase Head, thus the Erase Head is activated.
The bias current is applied to the R/P Head via Q21 and R100.
The OC current flow is as follows;
6 V DC-»Q21 turns ON (by High level of IC9 Pin 14)>Q21 collector +Q21 emitter-Erase Head.
Circuit Diagram
Tel. Line
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