Sony UVW-1800P Service Manual page 271

7. If the specifications A in step 6 is not satisfied,
adjust the zenith adjustment screw of the AT head,
zenith adjustment sere
(1) Ifthe specifications A is 30 % or low, turn the
zenith adjustment screw of the AT head Turn the zenith adjustment screw
counter-clockwise as shown. counter-clockwise.
This waveform is called as 30 %.
(2) Wf the specifications A is 70 % or more, turn
the zenith adjustment screw of the AT head
Turn the zenith adjustment screw
clockwise as shown,
This waveform is called as 70%.
8% (1) While the tape top is contacting with the TG-2
upper flange, adjust the TG-2 nut so that the Make the FE envelope fet.
RF signal amplitude becomes 2/3 of the
maximum amplitude,
(2) Adjust for the flat RF envelope at exit.
9. Loosen and adjust the TG-3 nut to remove and not
to make clearance between tape bottom edge and
TG-3 lower flange.
10. The amount of tape curl in the play mode must
satisfy the conditions below.
(1) Amount tape curl at the TG-2 upper flange
must be less than 1/10 of tape width.
(2) There must exist no tape cur} at TG-3 lower
flange.