Ricoh A229 - Page 48

ELECTRICAL COMPONENT DESCRIPTION
1-18
A229 SM
Symbol Name Function
Index
No.
S29 Base Plate Down Detects when the bottom plate is
completely lowered to stop the 1st
tray lift motor.
76
S30 Left Tandem Paper
End
Informs the CPU when the left tandem
tray runs out of paper.
73
S31 3rd Tray Paper Detects whether there is paper or not
in tray 3.
135
S32 Tray Down Sensor Informs the CPU when the bottom
plate is completely lowered, to stop
the 3rd tray lift motor.
134
S33 Duplex Entrance
Sensor
Detects the leading and trailing edges
of the paper to determine the reverse
roller solenoid on or off timing.
65
S34 Duplex Transport
Sensor 1
Detects the position of paper in the
duplex unit.
66
S35 Duplex Transport
Sensor 2
Detects the position of paper in the
duplex unit.
68
S36 Duplex Transport
Sensor 3
Detects the position of paper in the
duplex unit.
71
S37 Duplex Jogger HP Detects if the duplex jogger fences
are at the home position or not.
69
S38 Relay Detects misfeeds. 104
S39 Registration Detects misfeeds. 106
S40 Guide Plate Position Detects whether the registration guide
plate is closed or not.
105
S41 Fusing Exit Detects misfeeds. 107
S42 Exit Detects misfeeds. 108
S43 Tray Paper Limit
Detects paper overflow on the output
tray.
109
PCBs
PCB1 SBICU Controls all base engine functions
both directly and through other control
boards.
23
PCB2 PSU Provides dc power to the system and
ac power to the fusing lamp and
heaters.
57
PCB3 IOB Controls the mechanical parts of the
machine (excluding the scanner unit
section), and the fusing lamp.
52
PCB4 SBU Contains the CCD, and outputs a
video signal to the SBICU board.
21
PCB5 Scanner Motor Drive Drives the scanner motor. 51
PCB6 Lamp Regulator Provides dc power to the exposure
lamp.
22
PCB7 DC/DC Converter Generates dc voltages. 19
PCB8 LDDR Controls the laser diodes. 27