Ricoh MP 7503SP Field Service Manual page 1266

7. Troubleshooting
SC362-00
SC370-01
1264
C TD sensor output error: Lower limit
TD sensor output voltage (Vt), measured during each copy cycle, is detected
10 times lower than 0.5V.
• TD sensor harness loose, broken defective
• Toner bottle motor harness loose, broken, defective
• TD sensor defective
• IOB defective
• Toner bottle motor defective
Note: When the TD sensor is defective, the toner supply is controlled
using pixel count and the ID sensor.
• Remove the development unit and inspect the TD sensor harness
• Inspect the toner bottle motor harness
• Replace TD sensor
• Replace toner bottle motor
• Replace IOB
C ID sensor adjustment error: LED output abnormal
One of the following ID sensor output voltages is detected at ID sensor
initialization.
• Vsg less than 4.0V when the maximum PWM input (255) is applied to
the ID sensor.
• Vsg greater than or equal to 4.0V when the minimum PWM input (0) is
applied to the ID sensor.
• ID sensor dirty (ID sensor pattern defective)
• ID sensor harness, connector loose, broken, defective
• ID sensor defective
• IOB defective
• Remove the drum unit and inspect ID sensor harness
• Clean ID sensor
• Replace ID sensor
• Replace IOB