Canon FAX-L1000 - Manual (Page 209)

3-65
FAX-L1000 Chapter 3: Technical Reference
2.6.4 Functions
a) ECNT board
Fixing heater control
The fixing heater control section monitors the DC voltage supplied from the power supply
in response to the AC 187~264 V, and the fixing heater thermistor, and drives the heater so
that the temperature reaches the specified level. If the heater temperature is judged to be
abnormal, the power supply to the heater is shut off.
High voltage generation/ control
The high voltage control section is to control the high voltage applied to the toner cartridge
primary charge roller and developing cylinder, and the transfer charging roller of the toner
transfer section.
Drive control
The drive control section controls the main motor, paper pickup solenoid, and fan. Also, the
FANTAC signal from the fan via the power supply unit is detected, and the fan rotation
monitored.
Sensors detection
The ECNT board monitors the drive section by detecting the statuses of the sensors in the
printer section and paper pickup section.
SCNT board interface
The SCNT board interface section serially transmits the horizontal synchronization signal
(nBD) and the vertical synchronization signal (nTOP) to the SCNT board, and, in turn,
receives serially transmitted command signals from the SCNT board, and returns status
signals, in order to inform the SCNT board of the printer section status.
Laser control
The laser control section controls the drive of the laser diode in the laser/ scanner unit, in
response to print data from the SCNT board. It also the laser diode auto power check,
performed on each line of print data.
Horizontal synchronization signal control
When the laser beam reaches the horizontal printing start position, the horizontal position
detection signal (nBDI) from the laser laser/scanner unit is detected, and the horizontal
synchronization signal (nBD) sent to the SCNT board. Also, the output frequency status of
the horizontal synchronization signal (nBD) is monitored.
Scanner motor control
The scanner motor drive is controlled so that the print image vertical resolution reaches 600
dpi. Also, the SCNTAC signal from the laser/scanner unit is detected, and the scanner motor
rotation status monitored.