40496501TH Rev.1 272.1.9 Print Compensation ControlThe print compensation can be made as shown below:(a) Simultaneous Compensation of the number of impact pinsThe NHDC LSI is provided with the compensation table for each pin to make necessarycompensation.Number of impact pins Few ManyDrive time Short Long(b) Duty control1. If the number of the lines which exceeds 60% printing duty is continuous 8 lines, the printerstarts 2-path printing at the 8th line.2. If the printer can activate 12 pins simultaneously in a line, it 2-path prints the line.(c) Temperature compensation (See2.1.14 "Alarm Circuit.")(d) Print mode compensationAccording to the thickness of the printing medium, the print mode is compensated as shownin the table below:Head Gap Range 1 2 3 4 5Print speed 100% 97% 95% 90% 89%Drive time Short Long(Drive time lengthens at each step.)2.1.10 Space motor control(1) The Main LSI generates the SPDV-P signal upon receiving the spacing command from theMPU. This is a fixed cycle pulse signal.The Main LSI varies the pulse duty according to the speed data from the MPU to control themotor speed.The SPFOW-P or SPREV-P signal from the Main LSI changes the current direction in the DCmotor to run the motor in the forward or reverse direction.SPFOW-PSPREV-PSPDV-PMotorCurrentFigure 2.13
