Pre-Quenching Corona Circuit - Ricoh FT5540 Service Manual

31 August 1989

9.2 PRE-QUENCHING CORONA CIRCUIT

Circuit operation begins with the application of +24 volts to CN1-1 on the PQC power pack.
This is the power source for the high-voltage (dc 5 kilovolts) corona.
When the Start key is pressed, the CPU energizes the PQC power pack through the TC/SC
power pack by supplying a LOW at CN101-B20. This turns on the LED, and the
phototransistor energizes the pre-quenching corona (PQC). The PQC turns off when the main
motor is turned off.
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