HP 8550 Service Manual - Page 132

4 Detach and keep the EEPROM from the old reader controller PCB. 5 Attach the old EEPROM to the new reader controller PCB. 6 Replace the parts, except for the cover removed in step 1. 7 Turn the copier on. 8 The control panel will indicate Error 353 (mismatch of serial numbers between the new reader controller PCB and the old EEPROM). 9 Enter service mode on the copier. 10 Select OPTION > USER > SERIAL and type in the five-digit serial number of the copy module. 11 Initialize the RAM on the reader controller PCB in service mode (FUNCTION > CLEAR > R-CON). 12 Enter the settings recorded on the copy module service label in service mode (COPIER > ADJUST > ADJ-XY, CCD); these are the same settings verified in step 2. 13 Press OK. 14 Select COPIER > FUNCTION > MISC-R > USE-LAMP in service mode. 15 Press OK. 16 Allow five minutes for the lamp to warm up. 17 Turn the scanning lamp adjusting VR clockwise or counterclockwise until it beeps. (See "Removing the intensitydetection PCB" on page 364.) 18 Select COPIER > FUNCTION > CCD > CCD-ADJ. 19 Press OK. 20 When END appears, exit service mode. 21 Reinstall the lower front cover (with the service label) removed in step 1. 22 Adjust auto gradation correction in user mode. (See "To adjust auto gradation" on page 125.) 130 Chapter 4 - Adjustments and maintenance EN