HP 4550 Service Manual - Page 220

Table 7-2 Alphabetical printer error messages (continued) CANNOT DUPLEX CLOSE REAR BIN Description: The printer cannot duplex because the rear output bin is open. CANNOT DUPLEX CHECK REAR BIN alternates with CANNOT DUPLEX CHECK PAPER Action: 1. Close the rear output bin door. 2. If the error message does not clear, turn the printer off and then on. Description: The printer cannot duplex because the rear output bin is open or the media is not supported by the duplex unit. CHECKING PRINTER Action: 1. Close the rear output bin. 2. If the error message does not clear, turn the printer off and then on. Verify that the media is supported by the duplex unit. See "Supported media weights and sizes" in Chapter 1. Description: The printer is performing an internal test. This process should take approximately 30 seconds. The message appears during the initiation of the engine test. When finished, the printer goes online. CLEARING PAPER FROM PRINTER Action: When the test has finished press [Go] to return the printer to the READY state. Description: Action: The printer has jammed or was turned on and media was No action required. detected in the paper path. The printer is attempting to clear these pages. CLOSE FRONT DUPLEX DRAWER Description: The duplex drawer is not completely closed. CLOSE MIDDLE FRONT DRAWER Action: Close the duplex drawer. Description: Action: The drawer that holds the intermediate transfer belt is open. 1. This drawer is called the ITB drawer, but is referred to as the middle front drawer for end users. Switch SW1 (refer to 2. Figure 7-31) indicates the drawer is open. When the drawer is closed, a plastic protrusion on the lower left corner of the Close the ITB drawer. If the message persists, remove the printer's left-side cover and inspect the mechanical linkage that closes SW1. drawer pivots an arm allowing SW1 to toggle to the open position. 3. Refer to the wiring diagram to verify the wiring; the twowire connector should be firmly seated to SW1 and the wiring harness should be firmly seated to connector J1003 of the DC controller PCB. 4. If the message persists, use an ohmmeter to verify functionality of SW1. CLOSE UPPER REAR DRAWER Description: Action: Switch SW5 (refer to Figure 7-29) monitors the closing of the 1. printer's upper rear door (this door allows you to access the fusing assembly). When the fusing door is closed, a tab on 2. the rear door pushes a door switch actuator that runs along the left-side of the printer and closes SW5. Close the upper rear drawer. If the message persists, remove the printer's left-side cover and inspect the mechanical linkage of SW5 and the lever. 218 Troubleshooting (continued on next page) C7085-90921