USING SERVICE PROGRAM MODES 20 February, 2001
5-48
5.1.14 ID SENSOR ERROR ANALYSIS (SP2-221)
A defective ID sensor does not generate an SC condition, but does cause the
image quality to become worse (e.g., dirty background on the copy). If these
conditions occur, check the ID sensor output using this SP mode.
1. Vsg (VG in the display)
Error Condition: Vsg < 2.5V or (Vsg – Vsp) < 1.00V
Possible causes:
• ID sensor defective
• ID sensor dirty
• Drum does not get charged
2. Vsp (VP in the display)
Error Condition: Vsp > 2.5V or (Vsg – Vsp) < 1.00V
Possible causes:
• Toner density is very low
• ID sensor pattern is not created
3. Power (PW in the display)
This is the power for the light source of the ID sensor.
Error Condition: Vsg < 3.5V when maximum power (979) is applied
Possible causes:
• ID sensor defective
• ID sensor dirty
• Drum does not get charged
4. Vsdp
No Error Conditions
5. Vt
Error Condition: Vt > 4.5V or Vt < 0.2V
Possible causes:
• TD sensor defective
VG:3.84,VP:0.27,PW:139
VSDP:3.57,VT:2.09
B039M013.WMF
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