3-56 Phaser 7500 Printer Service Manual
Error Messages and Codes
POB Sensor On Jam
The POB Sensor does not turn On within the specified time after the Regi Clutch
On.
Applicable Chain-Link Code
• 077-110: POB Sensor On Jam
Initial Actions
• Check the paper path for debris.
• Power cycle the printer.
• If the problem persists, follow the procedure below.
1. Check the paper transportation failure due to debris/ burrs on the paper path.
2. Check each Takeaway Roll and Pinch Roll for contamination, wear, and
rotation failure.
3. Check the Regi Roll and Pinch Roll for contamination, wear, and rotation
failure.
4. Check the 2nd BTR for contamination, wear, and rotation failure.
5. Check the IBT Belt for wound up, stuck paper.
6. Check each Takeaway Roll Drive Gear for wear and damage.
7. Check the Regi Roll Drive Gear for wear and damage.
8. Check the 2nd BTR Contact Retract Drive Gear for wear and damage.
9. Is paper used out of specification (refer to “Paper and Tray Specifications” on
page 1-19?
10. Check the POB Sensor for contamination and improper installation.
11. Perform the Jam Sensors test in Diagnostics.
12. The connection between the POB Sensor J180 and the Motor Drive PWB J524
for open circuit, short circuit, and poor contact.
13. Perform the Main Motor test in Diagnostics.
14. Perform the 2nd BTR Contact Retract Motor test in Diagnostics.
15. Perform the Takeaway Clutc h test in Diagnostics.
16. Perform the Registration Clutch test in Diagnostics.
17. If no problems are found, replace the following parts in sequence:
• Motor Drive PWB (REP 18.13, page 8-204)
• MCU PWB (REP 18.12, page 8-202)
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ POB Sensor, PL14.4.16
■ MCU PWB, PL18.3.6
■ Motor Drive PWB, PL18.3.7
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