HP 4550 Service Manual - Page 226
Remove Paper Top Output Bin, Press Select To Change Toner
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Table 7-2 Alphabetical printer error messages (continued) REMOVE PAPER TOP OUTPUT BIN Description: The top output bin holds 250 sheets of paper. Sensor PS9 (see Figure 7-21) along with its sensor flag detects the height of the output paper stack. Perform the action items if this message appears with no paper in the output bin. Action: 1. Verify that the PS9 sensor flag and arm move freely and its movement is not blocked (see Figure 7-21). 2. Verify PS9 is free of dust and debris (top assembly cover must be removed to access sensor). 3. Verify all connectors are firmly seated. Refer to the wiring diagram. Note PS9 (a three-wire sensor) plugs into a through-wall connector on the printer's chassis and then into a 14-pin wire harness, which plugs into J206 on the developing PCB (see Figure 7-21). All signals from the developing PCB are routed to J201 on the developing PCB to J1017 on the DC controller PCB. RESETTING MEMORY Description: Action: The printer is executing a memory reset. The printer returns No action required. to the READY state upon completion of this process. RESETTING VALUES FINISHED Description: Action: The color calibration density values have been reset to their No action required. default values. RESTORING FACTORY SETTINGS Description: Action: The printer is executing a RESTORE FACTORY SETTINGS No action required. or a COLD RESET. SELECT LANGUAGE Description: The language selection power-up key sequence has been entered. The printer will prompt the user to select a new control panel display language once it has completed its initialization process. Action: Select new language when prompted. SERVICE MODE Description: Action: The Service Mode power-up key sequence has been Press [Go] to end Service Mode. entered. The printer will remain in Service Mode until [Go] is pressed. TONER CMYK LOW Description: Action: The toner cartridge specified is low on toner. This message Printing will continue until a TONER OUT message appears. appears if TONER=LOW (default) is set on the printer control To change the toner cartridge now, press [Select]. panel in the Configuration Menu. TONER CMYK OUT alternates with PRESS SELECT TO CHANGE TONER Description: The toner cartridge specified is out of toner. Action: Press [Select] to enter the toner replacement mode. Press [Go] to resume printing without changing the cartridge. TONER CMYK LOW alternates with PRESS SELECT TO CHANGE TONER Description: The toner cartridge specified is low on toner and must be replaced. This message appears when TONER LOW = STOP is set on the front panel in the Configuration Menu. Action: Press [Select] to enter the toner replacement menu. 224 Troubleshooting C7085-90921