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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