Unipulse F600AT Operation Manual page 68

"SEQ. ERR 4"
[Cause]
The near zero signal is OFF when weighing is started.
(On condition that it is set to confirm the near zero signal when weighing is started.)
[Remedy]
First, check the preset near zero value and near zero comparison target.
Next, check to see if:
1. A start was made in spite of incomplete discharge.
2. The start ON timing was too early.
3. Discharged items are jammed.
"SEQ. ERR 5"
[Cause]
1. The SP1 output is ON when weighing is started.
(On condition that it is set to confirm the weight value when weighing is started.)
2. Final weight – CPS ≦ 0.
[Remedy]
First, check the preset SP1 value, preset fall value, and preset final weight value.
Next, check to see if:
1. A start was made in spite of incomplete discharge.
2. The start ON timing was too early.
3. Discharged items are jammed.
4. Another code was selected.
The sequence error is reset by inputting the stop signal (OFF → ON).
How to reset the sequence error
17.ERROR MESSAGE
59