Process Control and MUSIC
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machine issues SC370 (ID sensor Calibration Error).
• SP3-320-011 (Vsg Error Counter)
• SP3-320-013 (Vsg Upper Threshold)
• SP3-320-014 (Vsg Lower Threshold)
• The above SPs can only be accessed from Special Service mode.
Agitating the Developer
This step agitates the developer, and gets the TD sensor output.
The developer agitation time is determined by the three factors below.
1. The change of absolute humidity
2. Non-use time
3. Coverage
Creating patterns, detecting the density
Five patterns are created by adjusting the charge/development bias on the transfer belt for each color. Then the
ID sensor detects the created patterns.
The ID sensor consists of an LED and two types of photo detector. The sensor detects the reflection from the
LED [B] with the direct reflection detector (REG) [A] and the diffused reflection detector (DIF) [C].
Determining Vtref from the Development Gamma
Detecting the development gamma value with an ID sensor pattern and measuring Vsp/Vsg determines the
charge/development bias for the correct image density.
Also, the reading from the TD sensor and the development gamma determine Vtref, which is the reference value
for the TD sensor.
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