TM 5-6675-319-14
9-3. TECHNICAL PRINCIPLES OF OPERATION.
9-3.1 G e n e r a l .
The printer operates by exposing a small portion of the
original at a time while electronically controlling the exposure time of each small
area.
A moving spot of light from the CRT sweeps the negative in a series of back
and forth movements until exposure is complete.
The speed at which the light moves
back and forth is controlled by the fast axis control loop. The number of lines
used to expose the entire negative and the spacing between lines are controlled by
the slow axis control loop.
The PMT, located behind the printing material, senses
the light transmitted through the negative and positive material. It sends a signal
t o t h e f a s t a x i s c o n t r o l l o o p.
9-7
