HP Laserjet 4V and 4MV Service Mode

1. Hold down the [On Line], [Form Feed], and [Enter] keys while powering ON the printer, until all lights are illuminated and the Display Window is blank. (If the Display Window reads 05 SELF TEST at this point, the keys were released too soon. Repeat this step until successful.)
2. Press the [Form Feed] key, then the [Enter] key. The message SERVICE MODE is displayed briefly, then the printer automatically begins a 05 SELF TEST. After several seconds, both Control Panel Indicators turn OFF. (The printer may display 02 WARMING UP if it has not warmed up completely.) After the printer has warmed up and passed the self test, SERVICE MODE is displayed.
3. Press [Menus] once to display SERVICE MENU.
4. Once it says SERVICE MENU press ITEM to scroll through service mode items.

To exit the Service Mode press the [On Line] key.

HP Laserjet 5si service mode

1. Hold down [Items] and [+] while powering ON the printer, until all lights are illuminated and the Display is blank. (If the Display Panel reads INTERNAL TEST at this point, the keys were released too soon. Repeat this step until successful.)
2. Press [Select]. The message SERVICE MODE is displayed briefly, then the printer automatically begins an INTERNAL TEST. After several seconds, both Control Panel Indicators turn OFF. (The printer may display WARMING UP if it has not warmed up completely.) After the printer has warmed up and passed the self test, SERVICE MODE is displayed.
3. Press [Menus] once to display SERVICE MENU.
4. Once it says SERVICE MENU press ITEM to scroll through service mode items.

To exit the Service Mode press [On Line].

HP Laserjet 8000, 8100, and 8150 Series service mode

1. Hold down SELECT and JOB CANCEL while powering on the printer, until all lights are illuminated and the Display is blank. (If the Display Panel reads INTERNAL TEST at this point, the keys were released too soon. Repeat this step until successful.)
2. Press MENU, then SELECT. The message SERVICE MODE is displayed briefly, then the printer automatically begins an INTERNAL TEST. After several seconds, both Control Panel Indicators turn off. (The printer may display WARMING UP if it has not warmed up completely.) After the printer has warmed up and passed the self test, SERVICE MODE is displayed.
3. Press MENU once to display SERVICE MENU.
4. Once it says SERVICE MENU press ITEM to scroll through service mode items.

To exit the Service Mode press GO.

HP Laserjet 5000 series service mode

1. Hold down [Select] and [Cancel Job] while turning on the printer. (If the control panel reads INITIALIZING, the keys were released too soon.)
2. Press the right side of the [Menu] key, then press [Select]. The message SERVICE MODE is displayed.
3. Press [Menus] once to display SERVICE MENU.
4. Once it says SERVICE MENU press ITEM to scroll through service mode items. To exit the Service Mode press [Go].

Reset Printer HP Laserjet 2200

Cold reset:

1. Turn the printer power off.
2. Press and hold GO.
3. Turn the printer power back on and continue to hold GO until the Attention light turns on.
4. Release GO.
5. The device lights will begin cycling from front to rear. The cold-reset process will run until completion and the device will go to the ready state.

NVRAM Reset:

1. Turn the printer power off.
2. Press and hold GO.
3. Turn the printer power back on and continue to hold GO until the Attention, Ready, and Go lights turn on.
4. Release GO.
5. The device lights will begin cycling from font to rear. The NVRAM initialization will run until completion and the device will go to the ready state.