Vhs Playback Frequency Response Adj; S-Vhs Playback Frequency Response - Panasonic AG-MD830E Service Manual

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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