Formax FD 372 Operator's Manual page 13

Choosing a fold type:
One of the six folding types (Single, Gate, Letter,
Zigzag, Double Parallel, Fold-out) can be chosen by
pressing the desired fold type key.
Example:
Single folding using C3 (Legal Size) Paper
Test folding:
If the Test key is pressed, two sheets will be folded
while not affecting the indication of the counter.
Check the folding of the second sheet.
If a folded sheet is skewed, refer to the feed angle
section on page 19, and 20.
Note:
If the stopper fine adjustment knob is moved, when
the Test key is pressed, the machine will continue to
fold. When the Start/Stop key is pressed, the
machine will start to fold after the stopper is returned
to the previous position.
Continuous folding:
When the Start/Stop key is pressed, the machine will
continuously fold the paper.
When the Start/Stop key is pressed while the machine
is in operation, the machine will stop the operation.
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