HP 4600 Service Manual - Page 418
Diagnostic tests, WARNING, - 59 90 error
UPC - 808736060875
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When the printer is in the special diagnostics mode, these four tests appear in the menu and are available. To gain access to other diagnostic tests or to leave the diagnostic mode, press CANCEL JOB (HP Color LaserJet 4600 models) or STOP (HP Color LaserJet 4610n and 4650 models) button, and then select Exit. The printer will reset itself, and then return to the normal state. NOTE You need to have a good understanding of how the printer operates in order to use the engine diagnostics successfully. Before proceeding with these diagnostic tests, make sure that you understand the information in chapter 5 of this manual. Diagnostic tests Different tests can be used to isolate different types of issues. For component or noise isolation, you can run the diagnostic test after removing the covers. Removing the covers provides a better view of the areas that are being tested. To operate the printer with the covers removed, the door switch (SW4, callout 1) lever must be depressed (this is the door-closed position) and you must depress the ETB connector (callout 2) after closing the ETB. WARNING! Be careful when performing printer diagnostics to avoid risk of injury. Only trained service personnel should open and run the diagnostics with the covers removed. Never touch any of the power supplies when the printer is turned on. Figure 7-18 Door switch and ETB connector NOTE Any time a cartridge is installed or removed while the covers are removed, the door interlock must be cycled to simulate opening and closing the top cover in order for the engine to recognize the change. The ETB must be closed and its connector must be depressed before cycling the door switch, or the printer will generate a 59.90 Printer Error. When the covers are installed, the door switch and ETB connector are automatically operated. When the covers are removed, you must perform these steps manually. 402 Chapter 7 Troubleshooting ENWW