Sony DSR-300 Service Manual page 248

2. Set the REVsearch mode.
Check the RF waveform at the exit.
If bad, rotate the TG-7 upper flange in the
counterclockwise direction by 90d, and perform
steps 1 and 2 again.
3. Set the REV search mode. Check that no curls
are formed on the TG-8 upper flange.
If curls are formed, rotate the TG-8 upper flange
in the counterclockwise direction and remove the
curls.
5-12
<RF waveform>
TG-7 upper flange
TG-8 upper flange
NG
OK
DSR-300/P(E)/V1