Sharp MX-2314N Service Manual page 461

b. Process registration sensor section
Signal name
REGS_F/IMGDS Registration sensor F (Inmate density sensor)
REGS_R Registration sensor R (Inmate density sensor)
Name
Detects color shift. (F side) / Detects the toner patch density.
Detects color shift. (R side) / Detects the toner patch density.
MX-3114N OPERATIONAL DESCRIPTIONS 13 – 41
Function/Operation