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1AF (2) Toner feed motor drive circuit S _RESET CPU (IC11) 74 73 1 8 VCC VCC 2 7 1 9 INH1 MONI 2 3 IN1 IN2 6 OUT1 4 OUT2 PG CN11-5 TFM CN11-6 IC14 +24 V Pin 2 (IN1) 0V Pin 3 (IN2) –24 V IC14 input voltage waveform Output voltage waveform across CN11-5 and CN11-6 Figure 2-3-4 Toner feed motor drive circuit The toner feed motor drive circuit generates a pseudo-AC supply to run the toner feed motor (TFM), an AC motor. Pulse signals output from the CPU (IC11) to pins 2 and 3 of driver IC14 alternate the polarities of the 24 V DC in the transistor H-bridge circuit incorporated in driver IC14. This voltage is output across CN11-5 and CN11-6 as a pseudo-AC supply. 2-3-5
