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SECTION
4
SERVO
SYSTEM
ALIGNMENT
41.
ALIGNMENT
SEQUENCE
The
servo
system alignment sequence is shown
in Chart 4-1.
DRUM FREE-RUNNING SPEED
ADJUSTMENT
(Section 4-3-1)
TV-VD LOCK PHASE AND HUNTING
ADJUSTMENT
(Section 4-3-2)
-
60PG
COIL POSITION ADJUSTMENT
(Section 4-3-3)
30PG COIL POSITION ADJUSTMENT
(Section 4-3-4)
PLAYBACK
SERVO
CHECK
(Section 4-3-5)
Chart 4-1
Servo system alignment
4-2.
EQUIPMENT
REQUIRED
Monitor:
SONY CV monitor
Frequency
counter:
Oscilloscope:
TV
camera:
SONY
model
AVC-3420CE
camera
Monitor
connection
SONY
model
VMC-1M
cable
cable:
Power
supply:
AC-3420CE
or
BP-20
4-3.
ADJUSTMENT
PROCEDURE
In TV
record
mode,
the servo
should
lock to
the TV vertical sync signal.
The free-running speed
of the head drum is 12,650 Hz.
4-3-1.
Drum Free-Running Speed Adjustment
Test Point:
TP-601
Adjust for:
12,650 Hz +10 Hz
Adjustment:
R621
Signal source:
None
Equipment
Required:
Frequency Counter
Procedure:
1.
Disconnect
cable from
TV-CAMERA
connec-
tor at the monitor.
Set TV-CAMERA
Select switch to TV.
Thread
tape on VTR.
a
te!
Check for +9V +B voltage.
5.
Connect
frequency
counter
to TP-601 of the
servo board.
6.
Set
up
the
record
mode
and
check
the fre-
quency
counter reading.
7.
Adjust
R621
so that
the frequency
counter
reading is 12,650 Hz + 10 Hz.
4-3-2.
TV-VD
Lock Phase Adjustment and
Hunting Adj.
Test Point:
TP-704 Servo board
Adjust for:
Correct servo lock phase
Adjustment:
R731
(lock
phase),
R732
(hunting)
Signal source:
Telecast signal
Equipment
Required:
1.
Oscilloscope
2.
Monitor
Procedure:
1.
Connect
the monitor
with a VMC-1M
cable.
2.
Set
the
TV-CAMERA
Select
switch
to
TV.
3.
Connect
scope to TP-704; set up the
2 V/cm,
5 ms/cm range.
41
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