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CANON LBP1000
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of CANON LBP1000 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 54 (click to view)
CHAPTER 2

2. Automatic power control of laser diode The laser driver IC conducts the automatic power control (APC) of the laser diode so that the laser diode emits a beam of constant intensity. The APC is conducted prior to the image formation (Initial APC) and between lines (between line APC). When the CNTRL0 signal and CNTRL1 signal input to the laser driver IC from the CPU are “L” and “H” respectively, the sample hold circuit in the laser driver IC enters the sample mode (mode in which the APC is performed). At the same time, the laser diode (LD) emits the laser beam forcibly. The intensity of the laser beam emitted from the laser diode is detected by the photo diode (PD) and fed back to the sample hold circuit via the current/voltage converting circuit and differential amplifier. The laser driver IC controls the output current of the drive circuit to make the fed back laser intensity become equal to the target laser intensity set in the IC. When the CNTRL0 signal and CNTRL1 signal become “H”, the laser diode is turned OFF forcibly and the sample hold circuit enters the hold mode. The laser driver IC converts the controlled laser intensity to voltage and stores it in the C804. 3. Horizontal sync control The CPU generates the UNBLANKING signal based on the BD INPUT signal (/BDI) sent from the BD PCB in the laser/scanner unit. During unblanking period, the CPU controls the LASER CONTROL signal to emit laser forcibly. There is a small fixed mirror (BD mirror) on the scanning start position in the optical path. The laser beam is reflected by the BD mirror and sent to the BD PCB in the laser/scanner unit. The BD PCB generates the BD INPUT signal (/BDI) based on the detected laser beam and sends the signal to the CPU. The CPU generates HORIZONTAL SYNC signal (/BD) based on the /BDI and starts sending the signal to the video controller when it detects that the picked up paper has reached the specified position. 4. Image masking control The CPU performs the image masking control in order to prevent laser beam emission in the non-image area other than the unblanking period. The laser beam emission enable period of the laser diode is controlled by masking the /VDO and VDO with the LASER CONTROL signals (CNTRL0, CNTRL1) in the logic circuit in the laser driver IC. The CPU sets the CNTRL0 and CNTRL1 to “H” in the image mask area other than the unblanking period so that the laser diode will not be turned ON/OFF when the /VDO and VDO are sent to the laser driver IC from the video controller. In image unmasking area, the laser driver IC turns ON/OFF the laser diode based on the /VDO and VDO by setting CNTRL0 to “H” and CNTRL1 to “L.”

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