MECHANISM - VCR
VR168 - 923-03485
4-15
D35E COMBO - SERVICING
Adjustment Procedure
1) Confirm that the Tape runs along the Tape Guide Line of
the Lower Drum.
2) If
the
Tape
runs at the bottom of the Guide Line, turn the
Guide Roller Height Adjustment screw clockwise.
3) If it runs at the top, turn it counterclockwise.
4) Adjust
the
Height
of
the
Guide
Roller
to
be
guided
to
the
Guide
Line
of
the
Lower
Drum
from
the
Starting
and
Ending
Point
of
the
Drum.
Test Equipment/
Fixture
Post
Height
Adjusting
Driver
Play
or
Review
Mode
Adjustment
Point
Guide
Roller
Height
Adjustment
screws
on
the
Supply
and
Take-Up
Guide
Rollers.
Fig.
C-4-1
Upper
Flange
Guide
Roller
Retaining
Screw
Guide
Roller
Height
Adjustment
screw
ADJUSTMENT
DIAGRAM
GUIDE ROLLER HEIGHT ADJUSTMENT
Purpose: To regulate the Height of the Tape so that
the Bottom of the Tape runs along the Tape Guide Line
on the Lower Drum.
PRELIMINARY ADJUSTMENT
PRECISE ADJUSTMENT
Test
Equipment/Fixture
Oscilloscope
Alignment
Tape
Post
Height
Adjusting
Driver
CH-1:PB
RF
Envelope
CH-2:NTSC:
SW
30Hz
PAL:
SW
25Hz
Head
Switching
Output
Point
RF
Envelope
Output
Point
Play
an
Alignment
Tape
Adjustment
Point
Guide
Roller
Height
Adjustment
Screws
Fig.
C-4-2
Fig.
C-4-3
P3
POST
ADJUSTMENT
P2
POST
ADJUSTMENT
Turn
the
Roller
Guide
Height
Adjustment
Screw
slightly
to
flatten
the
waveform.
Tracking
control
at
center
RF
ENVELOPE
OUTPUT
TEST
POINT
OSCILLOSCOPE
HEAD
SWITCHING
OUTPUT
TEST
POINT
Turn(Move)
the
tracking
control
to
both
directions
Adjustment
Procedure
1
) Play
an
Alignment
Tape
after
connecting
the
Probe
of
the
Oscilloscope
to
the
RF
Envelope
Output
Test
Point
and
Head
Switching
Output
Test
Point.
2
)
Tracking
Control(in
PB
Mode)
:
Center
Position(When
this
Adjustment
is
performed
after
the
Drum
Assembly
has
been
replaced,
set
the
Tracking
Control
so
that
the
RF
Output
is
Maximum).
3
)
H
e
i
g
h
t
A
d
j
u
s
t
m
e
n
t
S
c
r
e
w
:
F
l
a
t
t
e
n
t
h
e
R
F
W
a
v
e
f
o
r
m
.
(
F
i
g
.
C
-
4
-
2
)
4
)
T
urn(Move)
the
Tracking
Control(in
PB
Mode)
Clockwise
and
Counterclockwise.(Fig.
C-4-3)
5
) Check
that
any
Drop
of
RF
Output
is
uniform
at
the
Start
and
End
of
the
Waveform.
I
f
t
h
e
a
d
j
u
s
t
m
e
n
t
i
s
e
x
c
e
s
s
i
v
e
o
r
i
n
s
u
f
f
i
c
i
e
n
t
t
h
e
t
a
p
e
w
i
l
l
j
a
m
o
r
f
o
l
d
.
NOTE
Waveform
Diagrams
Connection
Diagram
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