Xerox Phaser 3435 Service Manual page 216

General Procedures and Information
engine informs the error status of the main system. And then the error message is dis-
played at LCD window or LED informing the error status of the user.
• Over Heat Error
For overall engine state, if the temperature of the fixing unit is higher than the specified
temperature and the temperature state is kept during the specified time, the engine
defines Over Heat Error. When this error is broken out, the engine stops all functions and
keeps it at the error state. Also, the engine informs the error status of the main system.
And then the error message is displayed at LCD window or LED to inform the error status
of the user.
* To recover the heat error: The heat error recovery is operated automatically when the
error is only caused by Low Heat Error, not the Heat Errors in Warm-up state and the Over
Heat Error. If an error happens, then the engine memorizes a present temperature. In
case of Low Heat Error, the maximum heat is supplied to the fixing unit. When a specified
time is elapsed, the engine detects the temperature again. If the present temperature is
higher than the memorized temperature, the error is recovered. In case of Over Heat
Error, no heat is supplied to the fixing unit. When a specified time is elapsed, the engine
detects a present temperature again. If the present temperature is a specified degree
lower than the memorized temperature, the error is recovered.
• LSU
LSU receives the image data from PVC or HPVC and make the latent image on OPC sur-
face.
It uses the dual beam, LD1 and LD2. But the control method of them is the same.
Just in comparison with the single beam, the dual beam has the half of LSUs frequency.
->The frequency of the dual beam = the frequency of the single beam /2.
The errors related to LSU are as follows:
* By LReady: When the printing is started, the engine drives the polygon motor of LSU.
After the specified time is elapsed, if the motor is not in a ready status, the engine detects
the error that the polygon motor is not in a ready status. If this error happens, the engine
stops all functions and keeps it at the error state. Also, the engine informs the error status
of the main system and the error message is displayed at LCD window to inform the error
status of the user.
* By Hsync: When the polygon motor is ready, the LSU sends out the signal called Hsync
and used to synchronize with each image line. So, if the engine does not detect consecu-
tively the signal for a fixed time, it defines the Hsync Error. If this error happens, the
engine stops all functions and keeps it at the error state. Also, the engine informs the error
status of the main system and then the error message is displayed at LCD window to
inform the error status of the user.
LSU Error Recovery: If the LReady or Hsync error happens, the paper exits out before
hand. The engine mode is changed to recovery mode and the engine informs the main
system of the engine mode. And the engine checks the LSU error. If the error doesn't hap-
pen, the printing job will be proceeding.
6-30 5/08 Phaser 3435