EasyManua.ls Logo

Fostex G16 - Page 47

Fostex G16
124 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
/Ui)
1)
Reproduce
bias
trap
module
(U6)
To
check
bias
leakage
of
TRACK
1,
the
oscilloscope
probe
is
hooked
to
TP-2
and
the
probe
ground
clip
to
the
GND
pin.
Put
TRACK
1
in
the
reproduce
mode,
the
adjacent
TRACK
2
in
the
record
mode
and
check
bias
leakage
at
TP-2.
T^-2.
It
is
considered
as
a
normal
condition
if
the
bias
leakage
level
is
less
than
280mV
p
_
p
(
20
dBV).
(At
checking
TRACK
2,
put
adjacent
TRACK
3
in
the
record
mode).
If
the
bias
leakage
level
is
higher
than
the
spec,
it
is
adjusted
to
the
minimum
bias
leakage
level
by
rotating
the
center
core
of-U6.
But
before
doing
this,
check
the
frequency
(100
KHz
±0.5
KHz)
of
the
erase/bias
master
oscillator.
To
check
the
oscillator
frequency,
pull
out
the
R/P
card
of
the
G16,
and
check
the
frequency
at
connector
J
2-7
on
the
Connector
Board
PCB.
(wo)
-p
-
2)
Record
bias
trap
module
^U10)
7
r
To
check
bias
leakage
of
TRACK
1,
the
oscilloscope
probe
is
hooked
to
TP-5
and
the
probe
ground
clip
to
GND
pin.
Put
TRACK
1
in
the
record
mode
and
check
bias
leakage
at
TP-5.
It
is
considered
as
a
normal
condition
if
the
bias
leakage
level
is
less
than
l.lV
p
_
p
(-8dBV).
If
the
bias
leakage
level
is
higher
than
the
spec,
it
is
adjusted
to
the
minimum
bias
leakage
level
by
rotating
the
center
core
of
U10.
But
before
doing
this,
check
the
frequency
(lOOKHz
±
0.5KHz)
of
the
master
oscillator.
To
check
the
oscillator
frequency,
pull
out
the
R/P
card
of
the
G16,
and
check
the
frequency
at
connector
J2-7
on
the
Connector
Board
PCB
Assy.
4.3.6
Erase
Current
Adjustment
1)
In
adjusting
the
erase
current,
put
all
the
16
tracks
in
the
record
mode.
2)
Rotate
all
the
16
tracks
of
the
ERASE
LVL
pot
(R207)
fully
CW.
2-0»
3)
To
adjust
TRACK
1,
for
example,
hook
the
hot
side
of
the
oscilloscope
probe
to
TP-6
and
ground
clip
of
the
probe
to
GND
pin.
4)
Set
the
core
of
T-l
(ERASE
ADJ)
so
that
voltage
at
TP-6
reaches
the
peak
level
point.
-
TP'&
5)
Then
adjust
ERASE
LVL
(R207)
so
that
the
voltage
at
TP-6
is
85mVp-p
or
30mVr.m.s.
(-30dBV).
6)
Calibrate
tracks
2
~
16
in
the
same
way.
44

Related product manuals