3-6
Measuring
Measuring point ( )
No. Item instruments & Mode
Adjustment parts ( )
Adjustment procedure
Input signals
Adjustment level ( )
3 ME SP VCO
offset
adjustment
(Error rate
adjustment)
Recording tape
(brand-new tape)
Moving Picture
• Self-REC/
PLAY
• ADJUST
MENU, 106.
ME SP VCO
(Notes)
• Be sure to use a brand-new tape for the ME
SP VCO offset adjustment.
• Be sure to clean the head with a head clean-
ing tape before adjustment.
• The error rate should be measured with the
Viterbi OFF. The Viterbi is switched OFF au-
tomatically when the adjustment mode is
entered.
• The error rate value is displayed in decimal
form.
(1)Record a moving image in advance on the NEW
recording tape for 5 minutes.
(2)Select ADJUST MENU No. 106, "ME SP VCO".
(3)Playback the recorded tape, press the
[STOP] button to decrease the adjustment EVR
data and freeze the image. (Pressing the
[A.DUB] button simultaneously with the or
button varies the adjustment value by
10
steps.)
(4)Increase the EVR data gradually until the block
noise just disappears. The current value is the
adjustment value "A".
(5)Playback the recorded tape and press the
[PLAY] button to increase the EVR data and fr-
eeze the image.
(6)Decrease the EVR data gradually until the block
noise just disappears. The current value is the
adjustment value "B".
(7)Calculate the intermediate value between the
"A" and "B" values.
(Since the adjustment values are hex numbers,
use a functional computation-capable calcula-
tor or the PC calculator provided in Accesso-
ries.)
C = (A + B)/2
Set the value "C" as the adjustment value.
(8)Playback the recorded tape again, confirm th-
at the error rate is within specification.
(9)Press the [SET] button to store the adjustment
data.
Monitor display
[PLAY] and [STOP]
buttons
Minimum error rate,
which should be 498
(per CH).
(Viterbi : OFF)
Adjusted EVR data value
Error rate display
Upper row : CH-1
Lower row : CH-2
––– ADJUST MENU –––
106.ME SP VCO
*
VR DATA : 08DFH
CTL DATA : 08DFH
SET DATA : 08DFH
65535
65535
Fig. 3.2.3 (1) SP VCO Offset Menu
Fig. 3.2.3 (2) Consept of the adjustment
Error
rate
VR DATADecrease Increase
Value A Value B
Freeze the image Freeze the image
Value C
Adjustment
Point
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