Canon NP6512 Service Manual page 60

CHAPTER 3 EXPOSURE SYSTEM
c. Monitoring the Activation of the Scanning Lamp
The activation detection signal (LAMP_DETECT) is sent to the microprocessor (Q900) on the
composite power supply PCB as long as the scanning lamp remains on.
The composite power supply PCB sends the lamp activation signal to the DC controller PCB in
serial by way of monitoring the activation of the scanning lamp (LA1).
Related Error Code
E220
• The lamp activation detection signal is not detected for 1 sec or more although the scan-
ning lamp activation signal has been sent.
• The lamp activation detection signal has been detected for 1 sec or more although the
scanning lamp activation signal is not sent.
If an error has been detected, the power switch will be turned off after indicating an error code
for 2 sec.
d. Scanning Lamp Intensity Auto Correction Control (ALVC control)
The machine automatically corrects the activation voltage of the scanning lamp to make up for
the change in copy image quality caused by deterioration/wear of the photosensitive drum.
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COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)