We found product RGPZ-315ML-0D has ink step same pattern around 7 step per piece. That printed on machine no.R2-35-51. The technical was turn off machine for one night and then turn on machine its unable turn on the machine because power supply not working, Therefore inform to plant engineer for repair. By switching the power supply with the machine no.V3-35- . After that problem ink step still the same as before.