Sony EVO-720P - Page 249

I
]
|
8-3-20.
REC
AFM
RF
Level
Check.
(HK-3
Board)
fote:
This
check
is
unnecessary
for
the
player
side,
83-21.
REC
ATF
RF
Level
Check
(HK-3
Board)
Note:
This
check
is
unnecessary
for
the
player
side,
H
|Mode
EE
[
Mode
EE
Bignal
Non-signal
|
Signal
Non
signal
\
(Measurement
Point
|
TPSO!
TPSO1
(REC RF: Pin © of CN102)
Measurement
Point
(REC
RF:
Pin
©
of
CNi02)
Measuring
Instrument
Oscilloscope
Measuring
Instrument
Oscilloscope
Specified
Value
2147
mVpp
Specified
Value
[+5
mVpp
ote:
An
MP-type
tape
should
be
inserted,
(Pin
©
of
CN101
should
be
at
“L”),
onnection :
Perform
the
two
connections
below
with
a
jumper
'
in
order
to
prevent
other
recording
signais
from
interfering,
* Emitter of 'Q502 (REC Y)
*
Pin
@
of
CNIOL
(REC
ATF)
GND
GND
vecking method :
Confirm
that
level
of
the
REC
AFM
RF
signal
is 2147 mVp-p,
2147 mVpp
J-—a4
Approx. 0.67 usec
Fig.
8-30.
REC
AFM
RF
level
check
Connection :
1)
Perform
the
two
connections
below
with
a
jumper
in
order
to
prevent
other
recording
signals
from
interfering,
+
Emitter
of
Q502
(REC
Y)—
GND
*
Collector
of
Q802
(Pin
@
of
IC80i)
—
Emitter
of
Q802
(REG
5V)
Checking method:
1)
Confirm
that
level
of
the
REC
ATF
RF
level
is
11£5 mVp-p,
ee
1145 mVp-p
Fig.
8-31.
REC
ATF
RF
level
check
—327-—