Teac TASCAM 32 - Page 80

2-11.
RECORD/REPRODUCE
AMPLIFIER
CHECKS
AND
ADJUSTMENTS
Preliminary Adjustments
A.Before
proceeding
with
any
electrical
perfor-
mance
checks
or
adjustments,
make
sure
the
tape
transport
mechanism
has
been
completely
aligned
as
mentioned
in
the
preceeding
section,
or
at
least
make
sure
that
the
tape
path
and
head
contact
are
aligned
correctly
by
the
following
methods:
TAPE PATH
1.
Advance
the
tape
in
the
play
mode
and
check
to
see
that
the
tape
is
not
curled
on
the
edges
of
the
tape
guide
poles
which
are
located
on
either
side
of
the
head
assembly.
.
If
curling
at
the
left
tape
guide
is
evident,
adjust
the
height
of
the
guide
by
inserting
a
shim
of
appropriate
thickness
(95
x
$8
x
0.5t
or
0.25t)
into
“A’’
of
the
left
tension
arm.
The
same
procedures
should
be
followed
for
the
right
tension
arm
height
adjustment.
See
Fig.
2-9.
HEAD CONTACT
1.
Load
a
prerecorded
tape
with
a
constant
level
tone
and
reproduce
at
high
speed
15
ips
(38
cm/sec).
.
While
observing
the
VU
meter,
temporarily
increase
back
tension
to
the
left
reel
by
lightly
applying
pressure
by
hand.
If
sufficient
con-
tact
pressure
is
applied
to
the
head
while
the
tape
is
running,
no
change
will
be
noticed
on
the
meter
when
back
tension
is
increased.
However,
if
in
sufficient
pressure
is
applied
to
the
head,
the
deflection
needle
will
show
increased
deflection
due
to
contact
pressure
caused
by
the
back
tension.
This
method
will
Tension arm height
adjustment shim (A)
po)
help determine whether head contact is
properly adjusted or not. To adjust, loosen
_ the retaining screws (A) for that head (Shown
in Fig. 2-12) and change the direction of the
head for proper alignment.
Note: The amount of pressure to be applied
to the reel is very important; too strong
of pressure lowers the speed of the tape,
while too light of pressure does not
ensure contact. However, by practicing
a few times, you will be able to judge
approximate pressure to be applied.
HEAD AZIMUTH ADJUSTMENT
1
==
. Connect the OUTPUT jack for channel L of
the deck to the vertical input terminals of an
oscilloscope.
. Connect the OUTPUT jack for channel R of
the deck to the horizontal input terminals for
the oscilloscope.
. Connect an AF level meter and a 50k ohm
load to the OUTPUT jack(s) as shown in Fig.
2-10.
OSCILLOSCOPE
Fig. 2-10. Head Azimuth Test Set-Up
Left tape guide Right tape guide
a
=
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D pty
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HO
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Fig. 2-9. Tape Path Adjustment
83