VC-MH815 (serv.man13). Adjustment and Replacement of Mechanical Parts - Sharp VCR Service Manual (repair manual). Page 12

Notes:
1. Previously set the tracking control in the center position,

and adjust the ATR signal waveform to maximum with X
value adjustment nut. Thereby the tape run rough ad-
justment is facilitated.

2. Especially the outlet side ATR signal waveform must

have higher flatness.

2. Adjustment of A/C head height and azimuth

1

Perform the initial setting of A/C head position by the
method stated in "4-15 Replacement 3".

2

Connect the oscilloscope to the audio output termi-
nal.

3

Using the alignment tape in which 1 kHz linear audio
signal has been recorded, adjust the height screw so
as to get max audio output.

4

Using the alignment tape in which 7 kHz linear audio
signal has been recorded, adjust the azimuth screw
so as to get max audio output.

5

The adjustment of 

3

 and 

4

 twice or three times

repeat, and finally adjust 

4

.

For X value adjustment
Adjust the X value, turning the gear-
type screwdriver.

3. Tape run adjustment

1

Connect the oscilloscope to PB ATR signal output
test point, set oscilloscope sync to EXT, trigger-input
the PB CHROMA signal (head switching pulse).

2

Rough adjustment of X value
Tentatively fix A/C head arm screws 

1

  by the method

described in 4-15 "Replacement 3".
Playback the alignment tape (VROCPSV) and
shortcircuit between TP801 and TP802. As a result
the auto-tracking is automatically cancelled, so that
the X value adjustment mode is set.
Move the A/C head with the X value adjustment gear
driver (JiGDRiVER-6) by the method shown in Fig-
ure 4-33, and adjust the A/C head so as to get the
maximum ATR signal waveform. (Note: When the A/
C head is adjusted, adjust so that the maximum ATR
signal waveform is obtained nearest the position of
initial setting made in 4-15.)