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8-4-1.
Playback Frequency Characteristic Adjustment
(SV-35
Board)
1.
CH-1 and CH-2 adjustments
Items
between
square
brackets
[
l
indicate the
adjusting
element for channel 2.
Mode
Playback
Alignment tape for frequency
Signal
characteristic
adjustment
(WR5-2C)
Pin
®
of CN018
Measurement
Point
External trigger :
Pin© of CN018
Trigger slope :
+
,
[
-
]
Measuring
Instrument Oscilloscope
Adjusting Element
RV501
(RV502)
Specified Value
3.58 MHz level : 5.5
MHz
level
=
4: 2.5
Adjusting
method
:
1) Adjust the
ratio between 3.58 and 5.5 MHz
levels
to
4 : 2.5
[
4 :
2.5]
with RV501
[RV502].
3.58 MHz
5.5
MHz
MHz
7
MHz
H
:
2
msec/
div
~-r--t~-t--t-~+--+-~+---+----<,___
Fig.
8-8.
Playback
frequency
characteristic
adjustment
8
-4-2.
Flying Erase Check (SV-35
Board)
Mode
Recording
Signal
Arbitrary
Measurement Point
Pin
Q)
of
CNO
15 (FE
(X))
Measuring Instrument
Oscilloscope and
frequency
counter
Specified Value
Frequency : 8.0
± 0.5
MHz
Note
: Use an
MP
type tape (level at Pin
®
of CN006
must be
low)
.
Checking method :
1)
Confirm that oscillation
frequency
is 8.0
±
0.5 MHz
and oscillation voltage is 8.0 Vp-p or
more.
T
Vp-p
or
more
1
Approx. 0.125
µs
Fig.
8-9.
8-4-3. Crystal Oscillator
fo
Check (SV-35
Board)
Mode
Playback
Signal
Alignment tape for operation
check
(WR5-3CSP)
Measurement Point
Emitter of Q614
Measuring Instrument
Frequency counter
Specified Value
4433619
±
50 Hz
Adjusting method
:
1)
Confirm that oscillation frequency at Emitter of
Q614 is 4433619
±
50 Hz.
T
Vp-p
(4433619
±
50
MH:z)
Fig.
8-10. Crystal oscillator
fo
check
-
156
-
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