40496501TH Rev.1 252.1.8 Printhead controlThe printhead is controlled by the Main LSI and NHDC LSI.Printing is synchronized with the ITOUT signal from the NHDC LSI.The NHDC LSI outputs the dot timing1 signals (DT1:1~18) and the dot timing2 signals (DT2:1~18),and the driver IC drives each dot magnet. These signals are output from the NHDC LSI after thefollowing corrections for final driving time determination inside the LSI:(1) Correction for the number of pins drivenThe driving time is corrected according to the number of pins driven at the same time out of18 pins.(2) Correction according to adjacent pin drive timingThe driving time is adjusted by checking whether the pin adjacent to the pin to be driven isdriven on the previous timing.(3) Correction for head gapThe driving time is corrected according to the head gap.Figure 2.11Print DataMPU NHDC LSIMain LSIDRIVERHEAD1-P~HEAD18-PPrint Data Print HeadControl BoardA/D busHEAD1~HEAD18Driver BoardTFA-NTFD-N
