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1. SERVO
CIRCUIT
ADJUSTMENTS
1-1.
Head Switching
Point
Adjustment
Purpose
of adjustment
and fault
occurring
if incomplete
Purpose:
To set
the video
head switching
point
| Fault:
- The vertical
sync
signal
is degraded
during
play to approximately
the centre
and vertical
jitter occurs.
where
the CH-1
and CH-2 envelopes
|
- Switching
noise
appears
across
the
l
|
bottom of the screen.
State
of VCR
Adjustment
Point
+ CH-1:
VIDEO OUT
- Play alignment
tape
> RT6O1
- CH-2: TP1104
(SW25Hz)
(Stairsteps Section)
+ Tracking
control:
Electrical
Centre
Waveforms
SW25Hz
(5V/div.,
50 uS/div. )
Adjustment
Procedure
|
|
|
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\
I
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VIDEO
VERTICAL
SYNC
y
|
|
|
|
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[Settings of oscilloscope]
Trigger with CH-2.
Set' the eynt slope to "—".
1) Vertical
sync signal:
Set to 6.5H40.5H
from the trailing edge
(trigger position)
of the SW25Hz pulse.
SIGNAL
(0. 5V/div. )
<————
_ 6.540.5H
———>
TRIGGER
POINT
1-2.
X-Value
Adjustment
Purpose
of adjustment
and fault
occurring
if incomplete
Purpose:
To obtain compatibility with other VCRs. | Fault: Noise occure when a tape recorded by
another
e
is pe
eee paces the
tracking
cannot be
-Play an alignment
- X-value adjustment
tape.
screw
(Colour bar section)
Test Equipment/jigs
Oscilloscope
Parts No. 7099052
Adjustment
procedure
1) Play the alignment tape (Colour bar section).
2) Press the tracking
(A) and (W) buttons
simultaneously
to set
the tracking
to the
centre.
3) Turn
the X-value
adjustment
screw
to maximize
the FM output.
Waveforms
FM ou tput
maximum
[Checking
in the autotracking mode]
4) Change
the connection
points
of the
GSE UNTOSCOREs
CH-1: Video output jack (US pin)
- CH-2: TP601
(CTL PULSE)
5) Play the alignment tape.
6) Press the AUTO tracking button on the remote
1
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{
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!
control.
(autotracking
function)
I
VIDE
T
7) Check
that
the time from the CTL pulse
pene
(positive pulse)
to V.SYNC in the video signal
!
ous /div.)
L_
{
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\
1
|
I
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i
t
!
It
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(50mV/div., 20u.s/div.)
[Waveforms
to be checked]
is 10ms + 0.2ms.
If the phase
is drifted
greatly,
perform steps
1) - 3) again.
TP601
(200mV/div.)
10. Oms+0. 2ms
The pulse at TP601
(CTL)
is locked and dees not
move
even when the X-value
adjustment.
screw
is
turned.
;
Activate
autotracking
again and check
the
phase.
E3-5
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