Ricoh A-P4, Service Manual

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Presents on the display the current values of Vsg, Vsp, Vpdp, and grayscale control.
If the ID sensor does not detect the ID pattern, “VSP = 5.0 V/VSG = 5.0 V” is displayed and
an SC code is generated.
If the ID sensor does not detect the bare area of the drum, “VSP = 0.0 V/VSG =0.0 V” is
displayed and an SC code is generated.
001 Vsg Drum Surface Output
[0V ~ 5.00V]
Vsg is the ID sensor output after reading the bare drum surface.
Normal display: 4
± 0.5 V
SC350 (ID Sensor Pattern Test Error) is issued if this reading is abnormal.
002 Vsp ID Sensor Pattern Output
[0V ~ 5.00V]
Vsp is the ID sensor output after reading the ID sensor pattern:
Normal display: 0.1 ~ 0.3
SC351 (ID Sensor Vsg Test Error) is issued if this reading is abnormal.
003 Vpdp Immediate Post-Pattern Output
[0V ~ 5.00V]
Vpdp is the ID sensor output immediately after Vsp output when the charge potential drops. This
reading is used for design purposes to determine the development characteristics. DFU
Normal display: 3.4 ~ 4.0
SC352 (ID Sensor Edge Detect Pattern Error) is issued if this reading is abnormal.
004 Vsm/Vsg DFU Grayscale Post-Pattern Output
[0V ~ 5.00V]
Vsm is the ID sensor output after reading the intermediate halftone pattern (grayscale) portion
of the ID sensor pattern.
Normal display: 65% ~ 85% (SP2972)
Note: The addition of the intermediate halftone pattern to the ID sensor pattern and the Vpdp
reading are features used by designers to check development characteristics.
3905 Hot Roller Strip
Hot Roller Stripper Cleaning After Job
5. Service Tables
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