5-4-(3). Heightadjustment Ofa/C Head; 5-4-(4). Fine-Adjustmentof A/Chead; 5-4-(5). Adjustmentofx-Value - Panasonic REV-1 Service Manual

5-4-(3). HEIGHT ADJUSTMENT OF A/C
HEAD
<When moving the A/C Head up>
(1)
(2)
(3)
Rotate the screw (A) counterclockwise until the
wrinkle appears on the lower edge of tape at P4
Post.
Rotate the screw (B) counterclockwise until the
wrinkle just disappears on the lower edge of tape
at P4 post.
Rotate the screw (C) counterclockwise until the
audio signal is maximized.
Q
~
Q---(l)
(2)- -@
%
P
c
-----(3)
I
Fig. M12
<When moving the A/C Head down>
(1) Rotate the screw (B) clockwise until the wrinkle
appears on the lower edge of tape at P4 Post.
(2) Rotate the screw (A) clockwise until the wrinkle
just disappears on the lower edge of tape at P4
post.
(3) Rotate the screw (C) clockwise until the audio
signal is maximized.
G
S (@ --(2)
(l)- -@
#
G
c
-----(3)
5-4-(4). FINE-ADJUSTMENT OF A/C HEAD
(1)
(2)
(3)
(4)
Connect the oscilloscope to the output of the
Head Amp as shown in Fig. M6.
Playback the Alignment Tape.
Make sure that the condition of the wrinkle at P4
Post. If the condition of the wrinkle is out of
specification, P4 Post adjustment has to be per-
formed as follows.
Turn the screw (A) counterclockwise until the
wrinkle appears on the lower edge of tape at P4
Post.
Turn the screw (A) clockwise until the wrinkle
disappears on the lower edge of tape at P4 Post.
Turn the screw (C) until the audio signal is maxi-
mized.
NOTE: Make sure that the audio output does not
increase when push the upper and lower
edges of tape around A/C Head.
Head Amp Output (RF Signal)
l-l u
t
Maximum
1
m
Fig. M14
5-4-(5).
ADJUSTMENT OF X-VALUE
. .
(PREADJUSTMENT)
Equipment required:
Fine Adjustment Gear Drive (VFK0330)
Specification: Less than 15 msec.
(1) Connect the oscilloscope to the audio output and
Fig. M13
the video output. Both output signals should be
fixed by the external trigger.
28