Ricoh FT6645 Manual page 23

ELECTRICAL COMPONENT DESCRIPTION
Symbol
PCB 5 Paper Feed Control
PCB 6 DC Power Supply
Unit
PCB 7 Guidance
PCB 8 Operation Panel
Lamps
L1 Exposure
L2 Fusing
L3 Quenching
L4 Erase
L5 Pre-transfer
Power Packs
PP1 Transfer
PP2 Charge
Others
TS1 Optics Thermoswitch Opens the exposure lamp circuit
TF1 Fusing Thermofuse
TH1 Fusing Thermistor
Name
Controls all components in the
paper bank.
Provides DC power.
Controls the guidance display.
Controls the LED matrix, and
monitors the key matrix.
Applies high intensity light to the
original for exposure.
Provides heat to the hot roller.
Neutralizes any charge remaining
on the drum surface after
cleaning.
Discharges the drum outside the
image area.
Reduces the charge on the drum
surface before transfer.
Provides high voltage for the
transfer belt and controls the
transfer belt positioning solenoid.
Provides high voltage for the
charge corona wires, and the grid
plate. Controls QL, PTL, and
charge wire cleaner motor
functions.
if the optics unit overheats.
Opens the fusing lamp circuit if
the fusing unit overheats.
Senses the temperature of the
hot roller.
Function
1-22
23 April 1993
Index
No.
112
113
120
121
18
32
37
38
40
117
119
19
33
24