Sony EVO-720P - Page 242

8-3-2, Flying Erase Check (FR-30P Board)
Note-:
‘This
adjustment
is
unnecessary
for
the
player
side,
Mode Recording:
Signal Arbitrary
TP401 (FE CHECK:
Measurement Point Pin ® of CN101)
Oscilloscope and frequency
Measuring Instrument is
counter
Frequency
so 7.940.
Voltage : rae
8,0£1.6 Vp-p and over
Specified Value
Note: Use an MP-type tape, (Pin @ of CN102 on
the FR-30P board should be at “L”.)
Checking method :
1)
Confirm
that
oscillation
frequency
is
7.9%0.5
MHz
and
oscillation
voltage
is
8.0+1.6
Vp-p.
7
8.01.6 Ve-p
~| [+ 0.126+0.008 usec
Fig. 8-13.
8-3-3, Crystal Oscillator fo Adjustment (HK-3 Board)
Mode Playback
Alignment tape :.
For operation confirmation
(WR5-SCSP)
Signal
TP301 e
(3.88 ; Pin @ of 1C301)
Measuring Instrument | Frequency counter
Adjusting Element CcVv301
Specified Value 443619430 Hz
Measurement Point
Note:
Connect
the
frequency
counter
through
a
high-impedance
(about
10
MQ)
and
low-
capacity
(10
pF
or
less)
buffer.
Adjusting methed :
1) Adjust to 443619 +30 Hz with CV301.
+
Approx. 0.5 Ve-p
(443619+30 Hz)
Fig. 8-14. Crystal oscillator fo adjustment
~320—