D2-3
Audio/Control Head
1
3
2
4
5
[NG]
[OK]
MECHANICAL ADJUSTMENTS
2-3:
2-2:
When the Tape Running Mechanism does not work well,
adjust the following items.
CONFIRMATION AND ADJUSTMENT OF AUDIO/
CONTROL HEAD
1.
2.
3.
4.
When the height is not correct, turn the screw
3
to
adjust the height. Then, adjust the 1~3 again.
Playback the VHS Alignment Tape (Monoscope of ST-N5
MODE2).
Confirm that the reflected picture of stamp mark is
appeared on the tape prior to P4 Cap as shown in Fig. 2-
2-A.
a)
b)
Turn the screw
2
to set the audio level to maximum.
Confirm that the bottom of the Audio/ Control Head and
the bottom of the tape is shown in Fig. 2-2-C.
c)
When the reflected picture is distorted, turn the screw
1
clockwise until the distortion is disappeared.
When the reflected picture is not distorted, turn the
screw
1
counterclockwise until little distortion is
appeared, then adjust the a).
P4 Cap
Fig. 2-2-A
Fig. 2-2-B
Audio/Control Head
Fig. 2-2-C
TAPE RUNNING ADJUSTMENT
(X VALUE ADJUSTMENT)
Confirm and adjust the height of the Reel Disk.
(Refer to item 1-1)
Confirm and adjust the position of the Tension Post.
(Refer to item 1-2)
Adjust the Guide Roller. (Refer to item 2-1)
Confirm and adjust the Audio/Control Head.
(Refer to item 2-2)
Connect CH-1 of the oscilloscope to TP3002 and CH-2 to
TP101.
Playback the VHS Alignment Tape (Monoscope of ST-N5
MODE2).
Press and hold the ATR button on the remote control
more than 2 seconds to set tracking to center.
Set the X Value adjustment driver (JG153) to the
4
of
Fig. 2-2-B. Adjust X value so that the envelope waveform
output becomes maximum. Then, check if the
5
section
of Fig. 2-2-B is on the center position (or rather to the
cylinder side). In case of the envelope maximum at the
difference position from the center, adjust the matching of
picture and sound again.
1.
2.
3.
4.
5.
6.
7.
8.
Audio/Control Head
Reflected picture of
Stamp Mark
Stamp Mark
Tape
0.25
±
0.05mm
