1.The wearing block of slotting base is worn down seriously.
2.The wearing block of creaser and precreaser is worn down seriously
3.The gaps of pre-creaser,creaser and slotting are not adjusted properly
4.The pre-creasers are worn down
5.The creases are worn down
6.The rubber rings are aging.

1.Replace the wearing blocks of slotting base
2.Replace the wearing block of pre-creaser and creaser
3.Adjust the pressure of pre-creaser properly
4.Replace the pre-creaser and creaser
5.Replace the anvil rings

1.Cross feeding in feeder unit
2.The pressure of pre-creaser, creaser and cutting are too loose
3.The slotting knives are worn out
4.The slotting knives are not fit tightly.
5.The shafts of pre-creaser and creaser are uneven

1.Increase the pressure of feeding roll
2.Replace the feeding rubber wheels
3.Replace the feeding roll
4.Adjust the level of grid until all of them are in the same level
5.Adjust the shafts of pre-creaser and creaser until they are even

1.The suction motor is not running
2.Vacuum suction is too small
3.Adjustment of dust removing structure is incorrect
4.Too many papers are loaded on the feeding platform
5.Feeding gap of rubber roll is not correct , or the rubber roll is worn down
6.The feeding rubber wheels are worn out

1.1 Start the suction motor
1.2 Check if the fuses of suction motor are burnt out.
2.1 Check and adjust the vacuum pressure
2.2 Check running direction of suction motor
2.3 Adjust the switch of vacuum box
2.4 Check if the air hose are broken, if yes, replace it
2.5 Check if any jam in the outlet of suction system
3.Adjust the dust removing system per requirement
4.Reduce the height of stacking papers.
5.1 Increase the pressure of feeding rubber roll
5.2 Replace the feeding roll
6.Replace the feeding rubber wheels

1.The printing plate is not touching the anilox properly
2.The anvil pressure of printer is not correct
3.The cushion of printing cylinder is broken
4.The ink is dry too quickly

1.Adjust the gap between anilox and printing cylinder
2.Adjust the anvil pressure
3.Replace the cushion of printing cylinder
4.Add slow drying agent or change the ink

1.The holes of anilox are blocked
2.The rubber roll is uneven
3.The doctor blade is uneven
4.The inking is not even
5.The power transferring bearing is damaged

1.Clean the anilox
2.Adjust the rubber roll
3.Re-install the doctor blade
4.Mix ink until it is even
5.Replace the bearing

1.Anvil pressure is not properly
2.The anilox wore out
3.The printing plate is too hard
4.The pressure of printing plate is uneven
5.Ink is too transparent

1.Adjust the anvil pressure
2.Replace the anilox
3.Replace the printing plate
4.Fit the printing plates again
5.Improve the recipe of ink