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2.1.8 Printhead control
The 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 the
following corrections for final driving time determination inside the LSI:
(1) Correction for the number of pins driven
The driving time is corrected according to the number of pins driven at the same time out of
18 pins.
(2) Correction according to adjacent pin drive timing
The driving time is adjusted by checking whether the pin adjacent to the pin to be driven is
driven on the previous timing.
(3) Correction for head gap
The driving time is corrected according to the head gap.
Figure 2.11
Print Data
MPU NHDC LSI
Main LSI
DRIVER
HEAD1-P~
HEAD18-P
Print Data
Print Head
Control Board
A/D bus
HEAD1~
HEAD18
Driver Board
TFA-N
TFD-N
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