Ricoh A085, Manual

Page: 248 / 617

Symbol Name Function Index No.
Circuit Board
PCB1 dc power supply Drives the exposure and fusing lamps and
rectifies 100 Vac or 220/230/240 Vac input
and outputs dc voltages.
44
PCB2 Main control Controls all copier functions both directly
and through the other control boards. 10
PCB3 Scanner motor
control Controls the speed of the scanner drive
motor. 69
PCB4 Main motor
control Controls the rotation of the main motor. 71
PCB5 Operation panel Controls the LED matrix, and monitors the
key matrix.
93
PCB6 ADS sensor Senses the background density of the
original. 90
PCB7 High voltage
supply - CTBG Supplies high voltage for the charge
corona, grid bias, transfer corona, and
development bias. 9
PCB8 High voltage
supply - D Supplies high voltage for the separation
corona. 8
PCB9 PTL/QL stabilizer Provides high voltage for the quenching
and pre-transfer lamps.
73
PCB10 Duplex control
(duplex machine
only) Controls the rotation of the duplex feed
motor. 106
PCB11 LCT interface
(LCT machine
only) Interfaces the LCT control signal between
the main control board and the LCT. 80
PCB12 Guidance display
control (duplex
machine only) Controls the guidance display board. 92
PCB13 Guidance display
(duplex machine
only) Displays guidance for machine operation. 94
ELECTRICAL COMPONENT DESCRIPTION 12 February 1992
1-18