SC3xx: Image Processing
431
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
threshold for the specified consecutive times.
• TD sensor connector is disconnected
To check if the issue is resolved:
1. Cycle the power off/on.
2. Feed one sheet of paper.
3. Check Vt with SP3-210-001 through -004.
4. Check if Vt is higher than the upper threshold (specified in SP3-211-002).
Incorrect: Vt is higher than the upper threshold
Correct: Vt is equal to or lower than the upper threshold
Troubleshooting procedure:
1. Check all the connectors are firmly connected.
If not, reconnect the connectors. Check if the SC reoccurs by cycling the power off/on. If
the SC reoccurs, go to the next step.
2. Check the development unit (e.g. Gear/harness disconnected? Heat protection seal
removed? Using an old PCDU?).
If not good, replace the PCDU. If the SC reoccurs, go to the next step.
3. Check the TD sensor.
If not good, replace the TD sensor. If the SC reoccurs, go to the next step.
4. Check the parameters (e.g. SP3-030-061 through -064 should be changed from its
initial value, but could be not changed due to possible NVRAM clearing).
If not good, replace the PCDU and initialize the developer. This corrects the TD sensor
settings.
5. Check the toner supply unit, especially if the image density is too low.
If the toner bottle is empty, the toner supply route is clogged, and/or the toner supply
motor operates incorrectly, then correct the problem. If the SC reoccurs, go to the next
step.
6. Check the harness connection.
If not good, replace the harness between BiCU and PCDU.
7. Replace the BiCU.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC362-01 D TD sensor (Vt) lower limit error: Bk
SC362-02 D TD sensor (Vt) lower limit error 1: Cy
SC362-03 D TD sensor (Vt) lower limit error 1: Ma
SC362-04 D TD sensor (Vt) lower limit error 1: Ye
The value of Vt (SP3-210-003) is lower than the threshold for times specified.
• TD sensor connector is disconnected.
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