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L-PDl U
ADJUSTING THE ELECTROMAGNETIC
CONVERSION
CIRCUIT SYSTEM
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Note:
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During the adjustment
of the electromagnetic
conversion
circuit system, keep R404 out 1
of operation.
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1. PLL VCO adjustment
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[Procedure]
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1)Playback
the alignment
tape (or a self-recorded
tape).
1 1) During Circuit board (Main)
replacement
2)Call the adjustment
mode (V-ADJ).
I 2) During
E*PROM
replace-
3)Set the address to "2C", and call the data.
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ment
4) Using the FF key, vary the data that has been called until the playback image screen
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changes to the blue backscreen.
Then use the REW keytovarythedata
backward until 1
the data point is found where the screen starts to switch from the blue back to the I
playback image. At this time, take note of the data obtained at this point.
5) As in the above step 4), vary the data that has been called - this time using the REW 1 I
key - until the playback image screen changes to the blue back screen. Then use the 1
FF key to vary the data backward until the data point is found where the screen starts
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to switch from the blue back to the playback image. At this time, take note of the data I
obtained at the point.
0000
Blue back
Playback screen
0000
0000
Step 5)
REW key
Blue back
Position @ at which note
Position @ at which note
is made of the datum
is made of the datum
6) Calculate the data taken note of at the points @ and @I to find the center of these data, I
and shift to and determine
the central data by using the FF or REW key.
Example:
If the data taken note of at points @ and @ are 5A and 65, respectively:
2 2
5A.
5B.
5C.
5D.
5E.
5F.
60.
61.
62.
63.
64.
65
Y
2 13
0 <
0
2
5 a>
m
z
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Thecentral
data is set to "5F".
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