Ricoh FT5540 Service Manual page 41

31 August 1989
THERMISTORS
Drum
Bias
Fusing
POWER PACKS/STABILIZER
Power Pack - T/S
Power Pack - CC/Bias
Power Pack - Q/BR
Power Pack - PCC
Lamp Stabilizer
HEATERS
Drum
Anticondensation (option)
LAMPS
Exposure
Fusing
Erase
Quenching
Pre-transfer
PRINTED CIRCUIT BOARDS
Main
Monitors the temperature around the drum. The CPU
selects the bias compensation range based on its input.
Monitors the temperature around the drum and controls
development bias compensation.
Monitors the fusing temperature and turns the fusing lamp
on/off.
Provides high voltage for the T/S coronas.
Provides high voltage for the charge corona and the
development roller bias.
Provides high voltage for the quenching corona and the
cleaning bias roller.
Provides high voltage for the pre-cleaning corona.
Provides high voltage for the quenching and pre-transfer
lamps.
Warms the drum when the main switch is off.
Prevents moisture from forming on the optics.
Applies high intensity light to the original for exposure.
Provides heat to the fusing unit.
Discharges the drum outside the image area. Erases
lead/trail edge.
Neutralizes any charge remaining on the drum surface after
cleaning.
Reduces charge on the drum surface before transfer.
Controls all copier functions both directly and through other
PCBs.
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