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P1
P2
P3
P4
NO GOOD
~
NO GOOD
~
GOOD
~
Figure M25-E
9.
And confirm that the tape runs along the Cylinder
Lead Correctly.
3-6-3. FINE ADJUSTMENT OF THE TAPE
GUIDE POST HEIGHT
(P2 and P3)(UNEARITY)
«TOOL»
Alignment Tape
Post Adjustment Screwdriver ;
VFM8180HADH
VFK0329
Note:
Before playing back the alignment tape
playback a normal cassette tape and confirm
correct transport.
1.
Connect the oscilloscope to the TP6 of the Video
1 C.B.A. (Video RF Envelope and the head
switching pulse as a triggering signal.
2.
Play back the 2-nd portion (Monoscope 2) of the
alignment tape (VFM8180HADH).
Figure M26-A
3. Press the tracking control button on the front panel and
adjust for maximum.
4. If the RF envelope appears like example A or B in Rgure
M26B then adjustment of the tape guide post
(P2:Entrance) is necessary.
5. Adjust the tape guide post (P2) with the post adjustment
screwdriver so that the RF envelope wavefrom at the en
trance portion becomes flat as shown in Figure M26B.
r - - -,
Entrance Portion
I
I
I
I
I
I
L ___ .J
Figure M26-B
6. If the RF envelope appears like example D or E in Figure
M26-C , then adjustment of the tape guide post (P3:Exit)
is necessary.
7. Adjust the tape guide post (P3) in the same manner as the
P2 post so that the exit portion becomes flat as shown in
Figure M26-C.
r - - -
-1 Exit Portion
o
1111111' I IMffil
r-1\
IJlIF
E"~
I
I
L _ _ _ _ .J
Figure M26-C
8.
The output envelope should vary nearly parallel
with other condition as shown in Figure M26-D.
HEAD AMP OUTPUT (RF SIGNAL)
..
. . . - - IMAXIMUM
~
_ _
~n
~
Figure M26-D
9.
If the
RF envelope does
not meet these
specification "
V1/V0
~
0.7
V2/V0
~
0.8
V3/V0
~
0.7
then repeat steps 4-9 again.
3-18
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