Olivetti PR2 plus, Service Manual

Page: 94 / 179

683311W 4-42
Proceed as follows using an oscilloscope equipped with memory:
- Connect the oscilloscope ground to pin 2 (GND) and the probe signals to
pin 1 (OUT2) of connector J6 on the PR2MAGN board.
- Insert the "Amplitude and Skew Sample" chart code 751884Z from the Skew Control side. Record
the signal read when the head moves from right to left.
The signal recorded must not have a spread greater than 0.4 V. No action needs to be undertaken.
- Insert the "Amplitude and Skew Sampe" chart code 751884Z from the Jitter/Ampl side.
Record the signal read when the head moves from right to left. If the signal recorded does not reach
the value of 4 V peak-to-peak, the head assembly needs to be replaced.
Fig. 4-3
0,4 V
> 4 V
SKEW JITTER