Transfer/Separation Corona Power Pack - Ricoh FT5540 Service Manual

31 August 1989

7.4 TRANSFER/SEPARATION CORONA POWER PACK

The power pack has a dc-to-dc converter and a dc-to-ac inverter.
The dc-to-dc converter changes +24 volts (Vp) to 5.78 kilovolts dc for the transfer corona.
The inverter changes +24 volts (Vp) to 6.2 kilovolts ac with a slight negative dc bias for the
separation corona. Both coronas turn on when the CPU applys a LOW at CN101-A21.
The main board sends a LOW trigger signal to the TC/SC power pack when the lead edge of
the paper turns on the registration sensor. The TC/SC power pack turns off 328 milliseconds
after the trailing edge of the copy paper deactuates the registration sensor.
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