Ricoh A66 - Page 449

SC386: Vmin abnormal
Type: 5
- Description -
The main control board notifies the SCU when Vmin for black is out of
range (between 0.01 V and 0.20 V) and Vmin for color is out of range
(between 1.5 V and 2.2 V) at the creation of the 12-grade patterns
during process control.
- Detection Timing -
During the process control self check
- Possible Causes -
• LD control board
• Main control board
SP-Log: 7-402-3
SC387: Potential control Vsg (Vsg_ave) abnormal
Type: 5
- Description -
The main control board notifies the SCU when the average of the Vsg
readings (Vsg for potential control) taken by the ID sensor in one drum
rotation is out of the specified range (4.0
±
0.3 V).
- Detection Timing -
During the process control self check
- Possible Causes -
• LD control board
• Main control board
SP-Log: 7-402-3
SC388: Toner control Vsg (Vsg_ptn) abnormal
Type: 5
- Description -
The main control board notifies the SCU when the average of the Vsg
readings (Vsg for toner supply control) taken by the ID sensor at the
three points on the drum is out of the specified range (between
Vsg_ave –0.2 V and Vsg_ave +0.4 V).
- Detection Timing -
During the process control self check
- Possible Causes -
• ID sensor
• Main control board
SP-Log: 7-402-3
SERVICE CALL CONDITIONS
A166/A187/A189 6-12 SM