KX-P7100
4.4.9.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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