Panasonic AG-1980P Service Manual page 33

3-3-5.
VHSREC CURRENT
ADJ.
Fig.
E2
3-3-4.
S-VHS
REC CURRENT
ADJ.
TP
TP507 (HEAD
AMP
C.B.A.
:B-2
(HOT)
),
TP508 (HEAD
AMP
C.B.A.
:
B-1
(GND)
)
ADJ.
REC Y
:
VR3006 (MAIN
C.B.A,
:
F-4
)
,
REC C
:
VR3003 (MAIN
C.B.A.
:
G-4
)
MODE
REC
INPUT
COLOR BAR
TAPE
S-VHS
BLANK TAPE
M.
EQ OSCILLOSCOPE
m
1
.
Connect the oscilloscope
CH
1
to
TP507
and
GND
to
TP508.
2.
Turn
VR3006
to
reduce luminance component.
3.
Adjust
VR3003
so
that
the
cyan
level
is
40mV
±
5mVp-p.
(Refer
to Fig.
E3)
3.
Adjust
VR3006
so
that
the
sync
level
is
140mV
±
5mVp-p. (Refer
to Fig.
E4)
TP507,
TP
508
(H.
RATE)
n
—
pi
LI
—
LI
'
CYAN
LEVEL
;
40mVp-p±2mVp-p
Fig.
E3
TP
TP507 (HEAD
AMP
C.B.A.
:B-2
(HOT)
),
TP508 (HEAD
AMP
C.B.A.
:
B-1
(GND)
)
VR3007
(MAIN
C.B.A.
:
F-4
)
MODE
REC
INPUT
COLOR BAR
TAPE
VHS BLANK TAPE
M.
EQ
OSCILLOSCOPE
SPEC
140
±
5mVp-p
1
.
Connect the oscilloscope
CH
1
to
TP507
and
CH
2
to
TP508.
2.
Adjust
VR3007
so
that
the
sync
level
is
140mV
±
5mVp-p.
(Refer to
Fig.
E5)
3-3-6.
VHS Y PB LEVEL
ADJ.
TP
VIDEO
OUT
ADJ.
VR30006
(Y/C
PACK
:
A-8
)
MODE
REC
=>
PLAY
INPUT
COLOR
BAR
TAPE
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
VR30006
so
that
Y
level
is
1
.OV
±
0.05Vp-p.
(Refer
to Fig.
E6)
Fig.
E6
3-2