Skew And Signal Amplitude Control; Signal Amplitude Control - Olivetti PR2 E Service Manual

4.4.6 SKEW AND SIGNAL AMPLITUDE CONTROL

This check must be performed with the machine completely assembled and after having configured and
specified, during set-up, the magnetic device installed on the printer.
The signal source must be exclusively the following card:
- AMPLITUDE AND SKEW SAMPLE code 713483R for horizontal magnetic unit.
Using an oscilloscope with memory, proceed as follows:
- Insert the "Amplitude and Skew Sample" chart code 751884Z into the front feed slot from the Skew
Control side. Record the signal read when the printhead moves from right to left. The signal
recorded must not have a spread greater than 0.4V. No action is required.
- Insert the "Amplitude and Skew Sample" chart code 751884Z into the front feed slot from the Jitter/
Ampl. side. Record the signal read when the printhead moves from right to left. If the signal recorded
does not reach the value of 4V, replace the printhead.

4.4.7 SIGNAL AMPLITUDE CONTROL

This control must be performed in the same way as the previous. Insert a sample chart so that the jitter
and amplitude of the sample stripe are read. The printer will perform a read cycle before expelling the
chart. Using an oscilloscope with memory, check the amplitude of the signal read which must be uniform
and must have a value of no less than 4V peak-to-peak.
The check must be made when the printhead moves from right to left within the horizontal magnetic
reader.
4-28
Fig. 4-2
Y100250-4