Xerox 4400DT Service Manual - Page 134

Stacker Full Sensor The printer fails to indicate a stack full condition, or incorrectly indicates a stack full condition. Stacker Full Sensor Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Enter Service Diagnostics and select Sensor Tests. Replace the Go to step 2. 2. Scroll to Stacker Full Sensor and press OK. Engine Logic 3. Actuate and deactuate the Stacker Stack Full Sensor Actuator. Board (RRP 9.3 on Does the display alternate between "Full" and page 6-89). "Not Full" as you press and release the actuator? 2 Visually inspect the Stack Full Sensor Actuator. Go to step 3. Replace the Does the actuator move freely and is it in good condition (not broken or damaged)? Stack Full Actuator (RRP 10.12 on page 6-112). 3 1. Switch the printer power OFF. Go to step 5. Go to step 4. 2. Remove the Left Interface Cover (RRP 1.1 on page 6-6), Left Cover (RRP 1.2 on page 6-7), and the Left Plate (RRP 1.11 on page 6-16). 3. Switch the printer power ON. 4. On the Engine Logic Board, measure the voltage between P35 pin 2 and frame ground. Is the voltage +3.3 VDC? 4 On the Engine Logic Board, measure the voltage between P/J28 pin 10 and frame ground. Is the voltage +3.3 VDC? Replace the Engine Logic Board (RRP 9.3 on page 6-89). Replace the LVPS (RRP 9.5 on page 6-91). 5 1. Switch the printer power OFF. Replace the Replace the 2. Reconnect P/J35 to the Engine Logic Board. 3. Switch the printer power ON. 4. On the Engine Logic Board, measure the voltage between P/J35 pin 2 and frame ground. Engine Logic Board (RRP 9.3 on page 6-89). Stack Full Sensor (RRP 10.13 on page 6-113). Is there +3.3 VDC between P/J35 pin 2 and frame ground when the Stack Full Sensor is deactuated and 0.0 VDC when actuated? If the problem persists, replace the Stacker PWB (RRP 10.7 on page 6-107). Phaser 4400 Laser Printer Service Manual 3-37