Panasonic KX-P7105, KX-P7110 4.4.5. Laser Scanning Unit Control Circuit

4.4.5. Laser Scanning Unit Control Circuit
The laser unit consists of laser drive circuit and scanner motor drive circuit.
Laser control signals are as follows.
nVIDEO: This is actual data being printed.
nLDON: When the nLDON signal is low, the laser unit is activated.
When front door is opened, the laser unit is deactivated.
nHSYNC: This is a horizontal synchronizing signal sent from a timing sensor ( laser beam detect sensor )
which detects horizontal position of the laser beam across drum.
nADJUST: When the nADJUST signal is low, APC ( Auto Power Control ) is activated.
nSNRCTL: This is a control signal for the scanner motor.
nSNRLD: The scanner motor speed is maintained at approx. 20K rpm by a PLL ( Phase Locked Loop ).
While the scanner motor rotates ( approx. 20K rpm ), nSNRLD is low.
nSNRCLK: This is a reference clock of the scanner motor ( approx. 2KHz ).
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KX-P7105 / KX-P7110