Canon iR C3200 Series, Руководство по обслуживанию

Страница: 226 / 1216

Chapter 6
6-10
6.3.3.2 Scanning Lamp
0000-4394
The machine's scanning lamp is a xenon lamp made up of a glass tube in which xenon gas is sealed. On the outside
of the tube are 2 terminals laid in parallel in axial direction, while the inner side of the tube is coated with fluorescent
material. When a high frequency, high voltage is applied to the terminals, the gas starts to discharge, thus causing
the fluorescent material to emit light.
F-6-15
6.3.3.3
Turning On/Off the Lamp
0000-4395
The scanning lamp is turned on/off by the drive signal (LAMP_ON) sent by the CPU on the reader controller PCB.
When the signal is sent, the inverter PCB generates high-frequency, high voltage in the activation control circuit
using the drive voltage (+24 V) supplied by the reader controller PCB for the activation of the xenon lamp.
6.3.3.4
Checking for an Error
0000-4396
At time of initial activation (e.g., shading correction), the lamp is checked for a fault (low intensity, activation failure;
i.e., activation error caused by lack of intensity).
E220 (lamp activation error at power-on)
Indicates a fault in the inverter PCB, reader controller PCB, or scanning
6.3.4
Detecting the Size of Originals
6.3.4.1 Outline
0000-4397
The machine identifies the size of originals with reference to the combinations of the outputs of reflection type
sensors and the intensities of the CCD measured at specific points.
- in main scanning direction, of CCD (for AB, 4 points; for Inch, 2 points)
- in sub scanning direction, of reflection type photosensor (for AB, 1 point; for Inch, 2 points)
The machine identifies the size of an original using the following steps:
1. Search for External Light (main scanning direction only)
With the scanning lamp OFF, the level of the CCD at each point of detection is measured.
2. Detection of the Sensor Output Level
The scanning lamp is turned on, and the CCD level at each point of detecting in main scanning direction is
measured.
In addition, the LED of the reflection type photosensor in sub scanning direction is turned on to measure the output
of the sensor.
Fluorescent
material
Electrode
Open interval
Electrode
Electrode Electrode
Glass tube