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| Code | Signal name | Name | Type | Function/operation | Active condition |
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1 | SYNC | SYNC IN | Laser beam sensor | Bin diode | Detects the laser beam position. | LOW (0V) when |
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| By this signal the left image print | laser beam is |
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| start position is controlled. | detected. |
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2 |
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| No. 1 mirror |
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3 |
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| No. 3 mirror |
| Leads the laser beam to the OPC |
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| drum. |
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4 |
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| Second cylindrical |
| Corrects the laser beam |
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| lens |
| deflection by variations in the |
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| scanning mirror angle. Corrects |
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| the optical section dirt. |
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5 |
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| Fθ mirror (No. 2 |
| Corrects the laser beam form and |
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| mirror) |
| pitch. |
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6 |
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| Scanning mirror |
| Scans the laser beam and |
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| (rotation mirror) |
| performs imaging. |
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7 |
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| No. 1 cylindrical |
| Adjust the direction of laser beam. |
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| lens |
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8 |
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| Laser diode |
| Generates laser beam. (Controls |
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| ON/OFF for imaging) |
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(4) Operation
a. Wiring diagram
MCU(PCU) PWB | LSU PWB |
CPU (IC5)
ASIC
(IC8)
PMCLK
SAMP
LEND-
SYNC-
APCSTT
PMD-
VSYNC
PRSTT
+24V |
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| CN9 |
| CN601 |
1 | +24V | 1 | +24V |
2 | GND | 2 | GND |
3 | VDATA | 3 | VDATA |
4 | SAMP | 4 | SAMP |
5 | SYNC- | 5 | SYNC- |
6 | APCSTT | 6 | APCSTT |
7 | PMCLK | 7 | PMCLK |
8 | PMD- | 8 | PMD- |
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| Laser beam detection PWB | |
| IC603 |
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| (start position detection PWB) | |
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3 | 1 | CN603 |
| CN604 | |
regulator | +5VL | 1 | +5VL | ||
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| 2 | 2 | SYNC_ | 2 | SYNC_ |
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| 3 | GND | 3 | GND |
| +24V | CN602 |
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| 3 | +24V | Scanning motor | |
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| 1 | PMD- |
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| 2 | +24V |
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| 4 | PMCLK |
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| 5 | GND |
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Q603 |
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ASIC
(IC202)
CN8
CN203
SDATA |
LEND |
PRSTT |
VSYNC |
SYNC |
ICU PWB
5 |
| 1 |
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| INH |
| OUT |
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| LD | ||
4 |
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| /PD | ||||
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GND | IC601 | IM |
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| VCC | VPS |
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| VR601 | ||
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78
+5VL 
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3 | GND | CONT |
| VDD | O/I | 2 |
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| IC603 |
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| I/O |
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| 1 |
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b. Operation
The APC circuit is started by the APCSTT signal sent from the MCU (PCU) PWB, and laser diode is turned on/off according to the VIDEO signal. (The laser diode is turned on when the VDATA signal is HIGH.)
When the laser diode is turned on, 780nm infrared semiconductor laser beams are radiated from the laser diode and arranged to be parallel beams by the collimeter lens and focused to the photocon- ductor drum by No. 1 cylinder lens and sent to the scanning mirror.
Rotation of the scanning mirror is controlled by the scanning motor to scan laser beams.
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