Fostex E-2 - Bias and Record Level Adjustments

Reproduce
alignment
tape
(IEC)
for
E-22:
Fostex
Model
9200A
(15
ips/38
cm/
s)
or
*[MRL
31J129
(15
ips/38
cm/s)],
Magnetic
Reference
Lab.
All
specs
are
identical
with
Model
9200A
except
for
reference
fluxivity
which
is
200
nWb/m
and
thus
its
reproduce
output
level
will
be
2.0dB
lower.
NOTE:
Alignment
for
30
ips/76
cm/s
will
be
by
playback
of
9200A
at
30
ips.
Wow/flutter
test
tape
for
E-22:
Fostex
Model
9201
(15
ips/38
cm/s)
or
*[STL
463-1
(30
ips/76
cm/s)]
[STL
462-1
(15
ips/38
cm/s)]
Standard
Lab.
The
following
check
and
alignment
methods,
pot
numbers
are
the
same
for
2)
Be
sure
all
selectors
are
released
(safe
mode),
all
REPRO
buttons
depressed,
SPEED
selector
set
to
HIGH,
and
METER
selector
set
to
CAL.
Then,
thread
the
15
ips
alignment
tape
on
the
recorder
and
play
the
tape.
3)
All
meters
should
indicate
ОУП
levels
during
reproduce
of
the
1KHz
reference
tone.
If
not,
adjust
the
reproduce
amplifier
level
for
a
OVU
reading
by
the
REP
LEVEL
pot
(R203,
10K(B).
These
pots
of
the
reproduce
amplifier
PCB
assembly
are
accessible
by
opening
the
meter
panel
of
the
E-2.
4)
Similarly,
during
playback
of
the
100Hz
and
10KHz
tones,
both
meters
should
indicate
levels
specified
for
the
alignment
tape.
If
not,
adjust
the
playback
equalization
by
the
REP
EQ
HI
pot
(R201,
5КИВ,
L,
R
CHAN;
2ок
в,
СОБ
CHAN/E-2;
R201,
2КОВ,
І,
В
CHAN;
5КЯВ,
CUE
CHAN/E-22).
5)
Set
the
INPUT/SYNC/REPRO
selector
to
SYNC
but
all
other
controls
as
set
in
above
Item
2,
and
play
the
alignment
tape
again.
6)
As
before,
all
meters
should
indicate
OVU
levels
during
reproduce
of
the
1KHz
reference
tone.
If
not,
adjust
the
reproduce
amplifier
level
for
OVU,
in
the
same
way
as
for
above
REPRO
mode
checking
and
adjusting,
by
the
SYNC
LEVEL
pot
(R208,
1ОКИВ).
Then,
adjust
the
reproduce
frequency
response
by
the
SYNC
EQ
HI
pot
(R206,
1ОКИВ).
7)
Switch
tape
speed
to
LOW
(7-1/2
ips),
reproduce
the
7-1/2
ips
NAB
align-
ment
tape
and
check
in
same
way
as
for
high
speed
(15
ips).
If
meter
reading
is
off
spec,
set
MONITOR
selector
to
REPRO
and
adjust
reproduce
frequency
response
by
the
REP
EQ
LO
pot
(R202,
5КОВ/Т,
&
R
CHAN;
20К0В/
CUE
CHAN).
Then,
set
the
MONITOR
selector
to
SYNC
and
adjust
the
reproduce
frequency
response
again
by
the
SYNC
EQ
LO
pot
(R207,
10К0В).
NOTE:
After
adjusting
the
EQ
pots,
reproduce
the
reference
level
to
check
for
a
OVU
reading,
if
necessary,
readjust
the
pots.
BIAS
LEVEL
AND
RECORD
LEVEL
ADJUSTMENTS
Switch
tape
SPEED
to
LOW
and
thread
a
blank
tape
on
the
transport.
Apply
а
10KHz
signal
of
approximately
-20dBV
(0.1V)
to
the
INPUT
XLR
connector
and
connect
an
AC
voltmeter
to
the
OUTPUT
RCA
phono
jack
cor-
responding
to
the
above
INPUT
jack.
Switch
the
INPUT/SYNC/REPRO
selector
to
REPRO
and
depress
the
RECORD
TRACK
selector
for
the
channel
whose
bias
current
is
to
be
adjusted.
Put
18