Ricoh A250 Service Manual page 49

Symbol Name
By-pass Tray Paper
S8
S9 By-pass Paper Size
S10 Vertical Transport
Registration
S11
S12 Fusing Exit
Exit Tray Paper
S13
Platen Cover
S14
S15 AIO Set
PCBs
BICU
PCB1
PSU
PCB2
IOB
PCB3
SBU
PCB4
PCB5 Lamp Stabilizer
PCB6 LD Unit
PCB7 Operation Panel
PCB8 Memory (Option)
Printer Controller
PCB9
(Option)
FCU (Option)
PCB10
NCU (Option)
PCB11
Lamps
Exposure Lamp
L1
L2 Fusing Lamp
Heaters
Anti-condensation
H1 (Option)
Drum (Option)
H2
SM
ELECTRICAL COMPONENT DESCRIPTIONS
Function
Informs the CPU that there is paper in the
by-pass feed table.
Detects the paper size in the by-pass tray.
Detects misfeeds.
Detects misfeeds and controls registration
clutch off-on timing.
Detects misfeeds.
Detects if there is paper on the exit tray or
not.
Informs the CPU that the platen cover is in
the up or down position (related to the
APS/ARE functions).
Informs the CPU that an AIO is installed.
Controls all base engine functions both
directly and through other control boards.
Provides dc power to the system and ac
power to the fusing lamp and heaters.
Controls the fusing lamp and the
mechanical parts of the machine.
Contains the CCD, and outputs a video
signal to the BICU board.
Stabilizes the power to the exposure lamp.
Controls the laser diode.
Controls the operation panel.
Expands memory capacity.
Receives print data from a PC.
Controls all fax communications and fax
features, in cooperation with the BICU.
Switches the analog line between the fax
unit and the external telephone.
Applies high intensity light to the original
for exposure.
Heats the hot roller.
Turns on when the main switch is off to
prevent moisture from forming on the
optics.
Turns on when the main switch is off to
prevent moisture from forming around the
drum.
1-9
Index No.
16
20
22
17
35
27
5
33
44
39
45
8
7
26
36
—
42
43
47
2
10
1
—
A250