Panasonic AG-7350 Series Service Manual page 74

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5-3-31. S-VHS PLAYBACK FREQUENCY
RESPONSE ADJUSTMENT (FOR AG-7350)
TP
ADJ. MODE
INPUT
PALS·VHS
30% SWEEP
VIDEO OUT 1 VR3007
PLAY
WITHOUT
BURST
TAPE M. EQ. SPEC.
SELF
OSCILLO·
RECORDED
SCOPE
100kHz: 4MHz=100: 60±10
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 E30.
3. Supply the 30% sweep signal with burst signal
to the video input and record it for a few
minute.
4. Play back the just recorded portion.
5. Connect the oscilloscope to the video out 1.
6. Adjust VR3007 so that the playback frequency
response becomes the ratio of 100 : 60 +/-1 0
at the marker points of 1OOkHz and 4MHz as
shown in Figure E31.
I
Video Sweep Input Signal
I
1 MHz 3MHz
0.3V
1V
(750 TERMINATED BURST: OFF)
Figure E30
VIDEO OUT 1
100kHz
Figure E31
5-3-32. S-VHS PLAYBACK FREQUENCY
RESPONSE ADJUSTMENT (FOR AG-7150)
TP ADJ. MODE INPUT
VIDEO OUT 1 VR3007
PALS-VHS
X
PLAY
TAPE M. EQ. SPEC.
30% SWEEP
OSCILLO·
RECORDED
SCOPE
100kHz: 4MHz=100: 60±15
S·VHS TAPE
5-14
1. Set the video mode to the "B/W" mode on the
On-Screen setting menu.
2. Prepare the prerecorded S-VHS tape which
recorded the sweep without burst signal on
another recorder (AG-7350) as shown in Figure
E28.
3. Play back the recorded tape.
4. Connect the oscilloscope to the video out 1
connector.
5. Adjust VR3007 so that the playback frequency
response becomes the ratio of 1 00 : 60 +/- 15
at the marker points of 100KHz and 4MHz as
shown in Figure E32.
VIDEO OUT 1
100kHz
Figure E32
5-3-33. TRACKING LEVEL ADJUSTMENT
(FOR AG-7350)
TP ADJ. MODE
INPUT
TRACKING
VR3008
PAL
COLOUR BAR
METER
PLAY
TAPE
M. EQ. SPEC.
SELF
X
OdB±0.5dB
RECORDED
Note: Make sure that the tracking volume is set to
thr centre fix position.
1. Supply a colour bar signal to video input and
record it for a few minute.
2. Play back the just recorded portion.
3. Adjust VR3008 so that the tracking meter
indicates OdB +/-0.5dB as shown in Figure E33.
TRACKING METER
dB
~INDICATOR
0/
-3dB
+3dB
Figure E33