Panasonic AG-7350 Series Service Manual page 73

5-3-29. VHS PLAYBACK FREQUENCY RESPONSE
ADJUSTMENT (FOR AG-7350)
TP
ADJ. MODE INPUT
PAL VHS
30% SWEEP
VIDEO OUT 1
VR3005
PLAY
WITHOUT
BURST
TAPE M. EQ.
SPEC.
SELF
OSCILLO·
RECORDED
SCOPE
100kHz: 2MHz=5: 5±0.5
TAPE
1. Set the video mode to the "B/W" mode on the
on-screen setting menu.
2. Set the sweep generator output as shown in
Figure E27.
I
Video Sweep Input Signal
I
1MHz 3MHz
0.3V
.1
v
(750 TERMINATED BURST: ON)
Figu re E27
3. Supply the 30% sweep signal without burst
signal to the video input and record it for a
few minute.
4. Play back the just recorded portion.
5. Connect the asci lloscope to the video out
connector.
6. Adjust VR3005 so that the playback frequency
response becomes the ratio of 1 00 : 100 +I -10
at the marker points of 100kHz and 2MHz as
shown in Figure E28.
VIDEO OUT 1
T
100%
l~
100kHz
2M Hz
Figure E28
5-3-30. VHS PLAYBACK FREQUENCY RESPONSE
ADJUSTMENT (FOR AG-7150)
TP ADJ. MODE INPUT
VIDEO OUT 1 VR3005
PALVHS
X
PLAY
TAPE M. EQ. SPEC.
30% SWEEP
OSCILLO·
RECORDED
SCOPE
100kHz: 2MHz=100: 100±15
TAPE
1. Prepare the prerecorded tape which recorded
a 30% sweep with burst signal on another
recorder (AG-7350) referring Figure E28.
2. Play back the just recorded portion.
3. Connect the asci lloscope to video out 1.
4. Adjust VR3005 so that the playback frequency
response becomes the ratio of 100 : 100 +!- 10
at the marker points of 1OOkHz and 2M Hz as
shown in Figure E29.
VIDEO OUT 1
r
100%
l
2M Hz
100kHz
Figure E29
5-13