Table of Contents
Advertisement
WHITE BLACK
PATTERN
~
GOOD~
-----~
~
~
NO GOOD
-"::::::::::..-_-
~)
~~
WAVING OR FRILLlNG
Figure M27-E
3-6-5. ADJUSTMENT OF
Ale
HEAD
A.
COARSE ADJUSTMENT OF THE A/C HEAD
HEIGHT
Note:
This procedure should be performed only
when the
A/C
Head is replaced.
«TOOL»
Check Light
;
VFK0948
Nut Driver
Purchase locally
VHS video Tape
1.
With the tape running, look at the lower edge of
the control head by using the check light.
2.
Adjust the Nut (A) as shown in Figure M28-A by
turning the Nut (A) clockwise to lower the head,
and counterclockwise to raise it.
CONTRIL HEAD
O.15mm
7- -
+
LOWER EDGE
OF TAPE
LOWER EDGE OF
CONTROL HEAD
Figure M28-A
A/C HEAD
BASE UNIT
B.
COARSE ADJUSTMENT OF THE A/C HEAD
TILT
Note:
This procedure should performed only when
the
A/C
Head is replaced or posts heights
are readjusted.
<<TOOL»
Alignment Tape
Check Light
Screwdriver (+)
VHS Vide Tape
VFM8180HADH
VFK0948
Purchase locally
1.
Play back a VHS video tape which the amount of
tape winding of a Take up Reel, Turn a screw (B)
to clockwise until waving or Filling appears in the
Lower edge of P4 post as Figure M28-B.
Note:
There is easy method to check waving or
Filling if there is waving or Filling in the lower
edge. ZEBRA pattern which is reflected on
the tape will curve or not linear (Figure M27-
E).
2.
Turn the screw (B) to counter-clockwise until
waving or filling do not appear in the in the lower
edge of P4 post.
LOCK SCREW (D)
CREW (B)
A/C HEAD BASE UNIT
Figure M28-B
C.
ADJUSTMENT OF A/C HEAD AZIMUTH
1.
Connect the scope CH1 to test point (Normal
Audio out put CH1) and the scope CH2 to test
point (Normal Audio output CH2) on the Rear
Jack.
2.
Play back the 2-nd portion (NormaIAudio6KHz)
of the alignment tape (VFM8180HADH).
3.
Adjust the screw (C) so that these phases of both
channels match as shown in Figure M28-C.
3-20
Advertisement
Chapters
Table of Contents
