A/C Head Height & Azimuth - JVC GR-AX770U Service Manual

11. Through the above steps, confirm that there occur no
wrinkling and damage in the tape around the pinch roller
and TU guide pole whenever the deck is in operation of
Loading/Unloading, Search Rewind and at mode change
from Search Rewind to play mode. If wrinkling or dam-
age in the tape occurs around the TU guide pole, ad-
just the angle (slant) of the A/C head to the tape. So that
the tape normally runs along the lower flange of the guide
pole.
Pole base (SUP)
(Guide roller)
Tension
pole
Fig. 2-4-4 Tape transport system
2-8
Pole base (TU)
(Guide roller)
TU guide
pole
Pinch
roller
2.4.3 A/C head height & azimuth
1. Connect the jig connector cable to CN25 on the MAIN
board.
2. Connect the channel-1 scope probe to the audio output
and connect the channel-2 scope probe to PB CTL.
3. Playback the alignment tape.
4. Set the tracking to its center range by pressing the (+)
and (–) tracking controls simultaneously.
5. Adjust screws A , B and C approximately 45 degrees
in the same direction to obtain maximum audio output
and CTL signal levels.
6. As a final fine adjustment, adjust screw B for minimum
signal level fluctuation and screw C for maximum out-
put signal level.
A/C head
Screw A
Fig. 2-4-5 A/C head
Fig. 2-4-6 Audio and CTL signal
Screw C
Screw B
Audio
signal
Control
pulse
signal