SERVICE PROGRAM MODE
B121 Series/B259 Series 5-74 SM
ID SENSOR ERROR ANALYSIS (SP2-221)
The image quality may become very bad when the ID sensor does not operate
properly. However, there is no such SC code that indicates ID-sensor malfunction;
instead, SP2-221 shows you some information on the ID sensor. Check this
information when the image quality is not very good.
The table lists the information shown with SP2-221 (ID Sensor Error Analysis).
SP Error condition Possible cause Remarks
SP2-221-1 Vsg
(VG in the display)
Vsg < 2.5V or
(Vsg – Vsp) < 1.00V
• ID sensor defective
• ID sensor dirty
• Drum not charged
SP2-221-2 Vsp
(VP in the display)
Vsp > 2.5V or
(Vsg – Vsp) < 1.00V
• Toner density very low
• ID sensor pattern not created
SP2-221-3 Power
(PW in the display)
Vsg < 3.5V
when maximum power
(979) is applied
• ID sensor defective
• ID sensor dirty
• Drum not get charged
Power source
for the ID-
sensor light
SP2-221-4 Vsdp No Error Conditions
SP2-221-5 Vt Vt > 4.5V or
Vt < 0.2V
• TD sensor defective
SP2-221-6 Vts
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