Sony UVW-1800P Service Manual page 273

7-7, CTL HEAD POSITION CHECK/ADJUSTMENT
Toots :
Alignment tape CR2-1B PS : 8-960-096-51
Dual trace oscilloscope
Box driver Giagonal length 4.5 mm)
3 mm screw driver
Check procedure
1. Connect an oscilloscope.
'CH-] : TP1O1/VP-43P, VP-43AP board (L-2)
CH-2 : TP102/VP-43P, VP-43AP board (P-1)
TRIG: CH-2
Playback the alignment tape CR2-1B.
3, Running the tape in play mode, press the RESET
button on the sub control panel to set the video
tracking in the center position.
4. Press the Left and Right keys on the sub control
panel which shift the video tracking. Check that
the RF signal arnplitude decreases when the video
tracking of off tracking. (Refer to Fig-1.)
5. Press the RESET (NO) button on the sub control
panel. Check that the center of the RF envelope has
the maximum amplitude. (Refer to Fig-2.)
6. If the requirements in steps 4 and 5 are not
satisfied, perform the next adjustment.
Adjustment procedure
7, Loosen the two screws fixing the CTL head ass'y
about 1/2 turn. Insert -3 mm screw driver tip into
the cut-out of the base. Move the CTL head in the
direction shown by arrow to obtain the maximum
amplitude at the center of the RF envelope.
(Refer to Fig-3.)
center of video
Fig-2.
center of video must be maximized.
Fig-3.