Repair Analysis Procedures
Phaser® 3500 Laser Printer Service Manual
2-14
Jam At Duplex (Duplex Jam 2)
Check Cartridge, Invalid Print Cartridge, Non-Xerox Cartridge, 
Replace Print Cartridge
Close Fuser Door
Step Actions and Questions Yes No
1.
1. Does the paper jam after reversal but 
before reaching the duplex sensor?
Replace the transport 
roller shaft.
Go to Step 2.
2.
1. Use service diagnostics to test the 
duplex sensor.
2. Does the sensor operate correctly?
Go to Step 3. Replace the duplex 
sensor.
3.
1. Inspect the exit and duplex rollers for 
any signs of damage or binding.
Replace the problem 
roller.
Go to Step 4.
4.
1. Replace the Duplex Assembly.
2. Does the problem still occur?
Replace the Main 
Board.
Replace the Power 
Supply Board.
Step Action and Questions Yes No
1.
1. Open the top cover and ensure that the 
Print Cartridge is properly seated. 
2. Does the error clear after reseating the 
cartridge?
Complete Go to Step 2.
2.
1. Check the Print Cartridge for damage.
2. Does the cartridge contain toner and 
appear to be operating properly?
Go to Step 3.  Replace Print 
Cartridge.
3.
1. Reseat all harness connections to the 
Toner Sensor (CRUM) Board. 
2. Does the error clear?
Complete Go to Step 4.
4.
1. Check continuity between the Toner 
Sensor (CRUM) Board and CN6 on the 
Main Board. 
2. Does the harness show continuity?
Replace the Toner 
Sensor Board.
Replace Harness.
Step Action and Questions Yes No
1.
1. Visually inspect the fuser door close tab 
for damage.
2. Is the tab broken?
Replace the Fuser. Go to Step 2.