Electrical Adjustment; Procedures - Panasonic AG-1980P Service Manual

SECTION
3.
ELECTRICAL
ADJUSTMENT
PROCEDURES
3-1.
TEST EQUIPMENT
To
perform
electrical
adjustment the following equip-
ment's are
required.
CO
h*
z
HI
E
H
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D
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tijO
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lUO-
1
.
V.T.V.M.
(Vacuum Tube
Volt
Meter)
or
D.V.M.
(Digital
Volt Meter)
2.
Dual-Trace Oscilloscope (More than
35MHz)
Range
:
Voltage 0.005
~ 50
V/div.
:
Frequency
DC
~
35
MHz
:
Probe
10:1
3.
Video
Sweep
Generator
4.
Sine
Wave
Generator
5.
Video
Signal Generator
6.
Monitor
TV
7.
Alignment
Tape (VFM8080HQFP)
8.
S-VHS/VHS
Blank
Tape
3-2.
How
to
Read
the
Adjustment
Procedures
(example)
TP VIDEO
OUT
ADJ. VR30006
(
Y/C
PACK
C.B.A.
:
A-8
)
MODE
REC
=»
PLAY
INPUT
COLOR BAR
TAPE VHS BLANK TAPE
M.
EQ OSCILLOSCOPE
SPEC
1
.0
±
0.05Vp-p
TP
:
Test
Point
ADJ.
:
Variable Resistor
MODE
:
Mode
of
VTR
when
adjustment
INPUT
:
Input signal for
adjustment
TAPE
:
Tape
for
adjustment
M.EQ
:
Measurement
equipment
SPEC
:
Specification of
adjustment
jERVO
SECTION
3-3-1.
PG
SHIFTER
ADJ.
TP
TP2001 (MAIN
C.B.A.:
1-7
)
,
VIDEO OUT
ADJ. VR2001 (MAIN
C.B.A.
:
D-3
)
MODE
PLAY
INPUT
COLOR
BAR
TAPE
VFM8080HQFP
M.
EQ
OSCILLOSCOPE
SPEC
8.5
±
1.0
H
1
.
Connect
the oscilloscope
CH
1
to
video output
connector and
CH
2
to
TP2001
(H.
SW).
2.
Adjust
VR2001
as
shown
in
Fig.
El
.
TP2001
(HEAD
SW)
VIDEO r
OUT r
T
3-3-2.
Fig.
El
REV
SLOW
TRACKING
ADJ.
TP
VIDEO
OUT
ADJ.
SP
:
VR2019
(MAIN
C.B.A.
:
B-5
),
EP
:
VR2018
(MAIN
C.B.A.
:
B-5
)
MODE
REC
=>
PLAY
INPUT
COLOR
BAR
TAPE BLANK TAPE
M.
EQ MONITOR TV
SPEC NO APPEAR
NOISE BAR
1
.
Connect
the Monitor
TV
to
video output connector.
2.
Place
the
unit
in
the
still
mode
on
the
self
recorded
(SP mode)
portion.
3.
Adjust
VR2019
so
that
no
noise bar
appear on
the
top
and
bottom
portion of
the Monitor TV.
4.
Place
the
unit
in
the
REV
Slow
mode
on
the
self
recorded (EP
mode)
portion.
5.
Adjust
VR2018
so
that
noise bar
is
minimized.
VIDEO SECTION
3-3-3.
EE
Y LEVEL
ADJ.
TP VIDEO
OUT
ADJ.
VR3601 (RF
AMP
C.B.A.:
F-1
)
MODE
STOP
INPUT
COLOR
BAR
TAPE
—
M.
EQ
OSCILLOSCOPE
SPEC
1.0
±
0.05
Vp-p
Note
:
Must be
heat up
more
than 10
min.
before perform
this
adjustment.
1
.
Connect
the oscilloscope
to
video output connector.
2.
Adjust
VR3601
so
that
Y
level
is
1
,0V
±
0.05Vp-p.
(Refer
to Fig.
E2)
3-1