DV-NC65H (serv.man13). Adjustment, replacement and assembly of mechanical units - Sharp DVD Service Manual (repair manual). Page 15

1. Set the cassette tape in the unit.
2. Press the PLAY button to put the unit in the playback

mode.

3. Roughly adjust the height of the A/C head by turning the

height screw until the tape is in the position shown
below.

Tape

0.3mm

A/C head

• Adjustment
Adjust the height screw

 

visually so that the control head is

visible 0.3 mm below the bottom of the tape.

Mechanism chassis

Cassette tape

Height screw

Tilt screw

Azimuth screw

Cassette Tape

1. Tape run rough adjustment

1 Check and adjust the position of the tension pole.

(See 8-14.)

2 Check and adjust the video search rewind back

tension. (See 8-12.)

3 Connect the oscilloscope to the test point for ATR

signal output (TP201). Set the synchronism of the
oscilloscope to EXT. The PB CHROMA ATR signal
is to be triggered by the head switching pulse (TP202).

4 Set the alignment tape (VROCPSV) to play.

5 Press the tracking button (+), (–) and change the

ATR signal waveform from max to min and from min
to max. At this time make sure that the ATR signal
waveform changes nearly parallel.

6 Unless the ATR signal waveform changes nearly

parallel, adjust the height of supply side and take-up
side guide roller so that the envelope waveform
changes nearly parallel. (For ATR signal adjustment
procedure refer to Figure 8-31.)

7 Turn the tilt screw to remove the tape crease at the

fixing guide flange.
Playback the tape and check for tape crease at the
fixing guide flange.
(1) If there is no tape crease

Turn the tilt screw clockwise so that tape crease
appears once at the flange, and then return the tilt
screw so that the crease disappears.

(2) If there is tape crease

Turn counterclockwise the tilt screw so that the
tape crease disappears.
(Reference) If the tilt screw is turned clockwise
crease appears at the lower flange.

Guide roller