HP 8550 Service Manual - Page 129
To adjust lamp output, To use lamp adjustment, when the lamp has been removed and replaced
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To adjust lamp output Use this procedure to adjust the output of the lamp after replacing various components of the copy module, including the lamp itself. This procedure can also be helpful in optimizing copied output quality. 1 Remove the lower front cover of the copy module. 2 Turn the copy module on. 3 Allow five minutes for the lamp to warm up. 4 Start service mode on the copier. 5 Select COPIER > FUNCTIONS > MISC-R > LAMP-ADJ. 6 Press OK. 7 Wait for the lamp to turn on, then turn the lamp-adjusting VR clockwise or counterclockwise until it beeps. 8 Press OK. READY should appear on the screen. To use lamp adjustment Use this procedure to recalibrate the output of the lamp in the following circumstances: l when the lamp has been removed and replaced l when replacing the intensity detection PCB, the reader controller PCB, or the firmware DIMM l when various other parts have been replaced This procedure is also used to optimize copied output quality. 1 Remove the lower front cover of the copy module. 2 Turn the copy module on. 3 Allow five minutes for the lamp to warm up. 4 Start service mode on the copier. 5 Select COPIER > FUNCTION > MISC-R > USE-LAMP 6 Press OK. 7 While the lamp is on, turn the lamp-adjusting VR clockwise or counterclockwise until it beeps. 8 Press OK. EN Copy module adjustments 127