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4-3-17. VHS PLAYBACK FREQUENCY
RESPONSE ADJ.
BOARD
VIDEO
1
C.BA
TP
VIDEO OUT
ADJ
VR3009(C-1)
TAPE
SELF RECORDED TAPE
INPUT
SWEEP
_(\"11TH
OUT BURST)
MODE
PLAY
M.EQ
OSCILLOSCOPE
SPEC
100KHz:
2MHz = 5 : 5.0 ± 1.0
1.
Set the sweep generator output
as
shown
in
Figure E14.
2. Record the sweep
signal.
3. Playback the just recorded portion.
4.
Connect the oscilloscope to video out.
5.
Adjust VR3009 so that the playback frequency
response becomes 5 :
5.0 ± 1.0 at the marker
points of
100KHz and 2MHz as shown
in
Figure
E15.
CVary
the vertical scope setting until the 100KHz
level
reaches 5 division)
(v.
RATE) I Video
Sweep
Input Signal I
100kHz
2MHz
4MHz
Figure E14
VIDEO OUT
(V.
RATE)
100kHz
2MHz
Figure E15
--,.-
0.3V
0.1V
0.3V
4-3-18. S-VHS PLAYBACK
FREQUENCY
RESPONSE
BOARD
VIDEO
1
TP
VIDEO OUT
ADJ
VR3006(C-1)
TAPE
S-VHS SELF RECORDED TAPE
INPUT
SWEEP (WITHOUT
BURSn
MODE
PLAY
M.EQ OSCILLOSCOPE
SPEC
100KHz:
4MHz = 5 : 4.0 ± 0.5
1.
Set the sweep generator output
as
shown
in
Figure E16.
2.
Record the sweep signal.
3. Playback the just recorded portion.
4.
Connect the oscilloscope to video
out.
5.
Adjust VR3006 so that the playback frequency
response becomes 5 :
4.0 ± 0.5 at the marker
point of
100KHz and 4MHz
as
shown
in
Figure
E17.
CVary
the vertical scope setting until the 100KHz
level
reaches division)
V. RATE I Video
Sweep
Input Signal I
100kHz
2MHz
4MHz
VIDEO
OUT
V.RATE
10
kHz
I
Figure E16
4MHz
Figure E17
0.3V
0.1V
0.3V
4-8
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