Panasonic AG-1980P Service Manual page 34

3-3-7.
S-VHS
Y PB LEVEL
ADJ.
TP
VIDEO
OUT
ADJ.
VR30005
(Y/C
PACK
:
A-7
)
MODE
REC PLAY
INPUT
COLOR
BAR
TAPE
S-VHS
BLANK TAPE
M.
EQ
OSCILLOSCOPE
SPEC
1.0
±
0.05Vp-p
1
.
Connect
the oscilloscope
to
video output connector
with
75
ohm
terminated.
2.
Adjust
VR30005
so
that
Y
level
is
1
,0V
±
0.05Vp-p.
(Refer
to Fig.
E7)
VIDEO
OUT
(H.RATE) _J
1.0Vp-p±0.05V
IT.
Fig.
E7
3-3-8.
COS EQ PEAK
ADJ.
TP
CP3005
(MAIN
C.B.A.
:
D-5
)
ADJ.
VR3002
(MAIN
C.B.A.
:
H-6
)
MODE
STOP
INPUT
SWEEP
SIGNAL
(20mVp-p)
TAPE S-VHS BLANK TAPE
M.
EQ OSCILLOSCOPE
SPEC
7.2
±
0.2Vp-p
1
.
Connect
the Service
Circuit to
CP3005
and
supply
the
sweep
signal.
2.
Set
the output
of
sweep
generator
to
20mVp-p
with
7.2Hz
marker.
3.
Turn
VR3001
to
full
counter-clockwise.
4.
Adjust
VR3002
so
that
7.2Hz
is
maximized.
(Refer
to Fig.
E9)
Note
:
Must be
perform
the
S-VHS
Frequency Response
Adjustment,
after
this
adjustment.
3-3-9.
S-VHS
FREQUENCY
RESPONSE
ADJ.
TP
VIDEO
OUT
ADJ. VR3001 (MAIN
C.B.A.
:
H-6
)
MODE
REC
=>
PLAY
INPUT 30%
SWEEP
SIGNAL
TAPE
S-VHS
BLANK TAPE
M.
EQ OSCILLOSCOPE
SPEC
lOOKHz
:
4MHz
= 5
:
3.5
+
0
°
5
1
.
Connect
the oscilloscope
to
video output connector.
2.
Playback the
just
recorded
portion,
3.
Adjust
VR3001
so
that the
sweep
signal
is
100
KHz:4MHz
= 5:3.5
+
0
°
5
3-3