Ricoh AC205 Service Manual - Page 173

Laser Scanning Unit, Operation Panel (ope)

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OPERATION PANEL (OPE) 6.5.5 LASER SCANNING UNIT The LSU consists of the LD (Laser Diode) and the polygon motor control. When a printing signal is received, the LD is turned on and the polygon motor is enabled. When the light sensor detects the beam, HSync occurs. When the polygon motor speed reaches target, LReady occurs. If these two conditions are satisfied, the status bit of the LSU controller register becomes one and the LSU is determined by control logic to be ready. 6.6 OPERATION PANEL (OPE) The OPE consists of various function keys and an LCD to show machine status and messages. A MICOM (HOLTEC HT48R50) drives the LEDs and LCD. Communication between the OPE and the CPU on the Main Board is serial (related signals are /Reset, TXD, and RXD). Detailed Descriptions SM 6-19 B273

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OPERATION PANEL (OPE)
SM
6-19
B273
Detailed
Descriptions
6.5.5 LASER SCANNING UNIT
The LSU consists of the LD (Laser Diode) and the polygon motor control. When a
printing signal is received, the LD is turned on and the polygon motor is enabled.
When the light sensor detects the beam, HSync occurs. When the polygon motor
speed reaches target, LReady occurs. If these two conditions are satisfied, the
status bit of the LSU controller register becomes one and the LSU is determined by
control logic to be ready.
6.6 OPERATION PANEL (OPE)
The OPE consists of various function keys and an LCD to show machine status
and messages.
A MICOM (HOLTEC HT48R50) drives the LEDs and LCD. Communication
between the OPE and the CPU on the Main Board is serial (related signals are
/Reset, TXD, and RXD).