MX2640n color issue

[copyguy1]

wondering if anybody is haveing these machines color registration shifting off, top to bottom on letter size. This would be front to rear of machine. Normally calibrating bring back into specs. But comes back inside of a month. Most of the time it has happened on newr machines. Any help would be appreciated

[igi]

hi
1-clean the registration sensors(under the belt-take belt out primary)
2-do sim 50-20 set values a to I to a 100
3-do sim 50-22 adjust as per manual
good luck

[mojorolla]

Change the procon (registration) sensors that sit above the IT belt. They sit on the underside of the toner cartridge assembly.