Table of Contents
Advertisement
en
I-
Z
W
i
:2
t-
en
I
::J
...,
Cl
«
...J
C3
CC
l-
Q
w
...J
w
4-1.
TEST
&
SERVICE
EQUIPMENT
To perform the electrical adjustment completely the
following equipments are required.
1.
VTVM (Vacuum Tube Volt Meter)
Capacity
:
0.001 to 50V
2.
DVM (Digital Volt Meter)
Capacity
:
0.001 to 50V
3.
Dual-Trace Oscilloscope (with probes)
Capacity
:
0.005 to 50V/div, DC to 30MHz
4.
Frequency Counter
Capacity
:
0 to 10MHz
5.
Sine Wave Signal Generator (RC Oscilfator)
Capacity
:
0 to 10MHz
6.
Video Signal Generator (Composite)
7.
Spectrum analyzer
8.
Color Monitor TV
9.
Waveform Monitor
10. Alignment Tape (VFM8080HQFP)
4-2.
HOW TO READ THE
ADJUSTMENT PROCEDURE
TABLE
BOARD
TP
ADJ
TAPE
INPUT
MODE
M.EQ
SPEC
BOARD:
TP:
ADJ.:
TAPE:
INPUT:
MODE:
M.EQ:
SPEC:
MAIN C.B.A.
TP3502 [F-2]
VR2002 rA-3]
ALIGNMENT TAPE
COLOUR BAR
PLAY
OSCILLOSCOPE
T
=
8.5
±
O.5H
Adjustment position of Print Circuit Board.
Connection
point
(Test
Point)
of
measuring eqUipment
* ( )
shown TP location on the board.
Adjustment component
* ( )
shown VR location on the board.
Tape for adjustment.
Supply a signal for adjustment.
Mode of VTR.
Example:
REC
->
PLAY is recording
signal
and
playback
the
portion just recorded.
Measuring equipment.
Specification for adjustment.
4-3.
ELECTRICAL ADJUSTMENT
PROCEDURES
4-3-1. PG SHIFTER ADJ.
BOARD
SERVO & SYSTEM CONTROL C.B.A.
TP
TP8002LHEAD SW)(A-1), VIDEO OUT
ADJ
VR2002(A-4)
TAPE
VFM8180HADH PORTION: 2
INPUT
MODE
PLAY
M.EQ
OSCILLOSCOPE
SPEC
T
=
8.5 ± O.5H
Note:
This adjustment should be performed only
after completion of the Tape Interchangeability
adjustment.
1.
Playback the alignment tape at the portion 2.
2.
Connect the oscilloscope to TP8002 for CH1 and
Video Out for CH2.
3.
Adjust VR2002 so that the falling edge of
switching pulse becomes 8.5
±
O.5H before the V-
sync portion as shown in Figure E1.
l
HEAD SW
TP8002
hurvmnrnnmkO OUT
Figure E1
4-3-2. SLOW FREE RUN ADJ.
BOARD
SERVO & SYSTEM CONTROL C.B.A.
TP
TP8009(A-1 )
ADJ
VR2001 (A-4)
TAPE
VFM8180HADH, PORTION: 2
INPUT
MODE
PLAY PAUSE
M.EQ
FREQUENCY COUNTER
SPEC
455Hz ± 5Hz
1.
Playback the alignment tape at the portion 2.
2.
Connect a jumper wire between TP8006 and GND
on the Video.3 C.BA
3.
Connect the frequency counter to TP8009 on the
Video 3 C.B.A.
4.
Adjust VR2001 so that the reading of frequency
counter is f
=
455Hz
±
5Hz.
5.
After this adjustment remove the jumper wire from
TP8006 and GND.
4-2
Advertisement
Chapters
Table of Contents
