Specifications

Chapter 6: FRU Replacement and Fault Isolation Procedures
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6.3.18 Toner Sensor failure (option)
NOTES:
1. The diagnostic tool is not used in this FIP>
2. The control panel message may be: Toner Low
3. This FIP may also fix a bad sensor or Toner cartridge .
4. If the toner sensor is disconnected or not working (P/J 21), it is not recognized as toner low.
1. INITIAL ANALYSIS
Inspect the following components. Are they compatible with your printer version, correctly
installed, not damaged, deformed, or contaminated?
• MCU PWB
• LVPS Assembly
• Toner Sensor Assembly
Yes No
Go to Step 2. Replace the problem components.
2. LVPS ANALYSIS
Disconnect P/J111 from the HVPS. Perform this test within 30 seconds after switching power on.
After 30 seconds, the LVPS shuts down with a no-load condition. Switch ON Main Power.
Is there +24VDC between P 21–1 and P 21–3 on the MCU PWB?
Yes No
Go to Step 3. Go to Section 6.3.2 LVPS Assembly Failure (+24VDC).
3. TONER SENSOR ANALYSIS
Disconnect P/J111 from the HVPS. Perform this test within 30 seconds after switching power on.
After 30 seconds, the LVPS shuts down with a no-load condition. Switch ON Main Power.
Is there +5VDC between P 21–4 and P 21–3 on the MCU PWB?
Yes No
Go to Step 4. Replace the MCU PWB.
4. TONER SENSOR ACTUATOR SIGNAL ANALYSIS
Disconnect P/J111 from the HVPS. Perform this test within 30 seconds after switching power on.
After 30 seconds, the LVPS shuts down with a no-load condition.Switch ON Main Power.
Is there 0VDC between P 21–4 and P 21–3 on the MCU PWB?
Yes No
Remove the Toner Cartridge. Close the Front Transport Assembly.
Is there +5VDC between P 21–4 and P 21–3?
Yes No
Replace the MCU PWB. Replace the Toner Sensor.