Panasonic UF-890 Service Manual page 248

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6.2.13 LSU Control Circuit

The laser control signals are described below.

The LSU is activated when this output signal is LOW. If an error occurs, the nLDON output signal level

goes High and the LSU is deactivated.

This is the actual Data Signal. The Laser is ON when the nVIDEO output signal level is LOW.

This horizontal synchronization signal transmitted from the Beam Detection Sensor sets the horizontal

position of the laser beam as it crosses the OPC Drum.

This is the Polygon Motor Control Signal. The Polygon Motor rotates when the nPMON output signal

level is LOW.

A Phased-Lock Loop (PLL) circuit keeps the Polygon Motor speed constant at 10,000 rpm when the

nPMRDY is at a Low output signal level.

This is the Polygon Motor Rotate Clock.

Laser Power Sample/Hold Timing Signal.

Laser Unit Control Circuit Block Diagram

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