Teac A-3340 - BIAS ADJUSTMENT; NORMAL POSITION BIAS ADJUSTMENT; HIGH POSITION BIAS ADJUSTMENT; RECORD LEVEL SET

BIAS ADJUSTMENT
: NOTE
Adjust BIAS trap (L 302/304) before adjusting
BIAS levels.
NORMAL Position
UW woh
Thread
a
record
test
tape
(Scotch
150)
on
the
unit.
Place
BIAS
switch
in
NORMAL
position.
Place
MONITOR
switches
in
TAPE
position.
Apply
a
400
Hz
signal
at
-8
dB
at
the
LINE
IN
jacks.
Adjust
VC
501/503
for
a
peak
on
the
level
meter.
Turn
the
capacitors
clockwise
until
a
decrease
of
0.5
dB
is
obtained.
HIGH Position
1.
RECORD LEVEL SET
1.
2.
3.
Mae WN
Thread
a
record
test
tape
(Scotch
203)
on
the
unit.
Place
BIAS
switch
to
HIGH
position.
Place
MONITOR
switches
in
TAPE
position.
Apply
a
400
Hz
signal
at
-8
dB.
at
the
LINE
IN
jacks.
Adjust
VC
502/504
for
a
peak
on
the
level
meter.
Turn
the
capacitors
clockwise
until
a
decrease
of
.0.5
dB
is
obtained.
Using Scotch 203 tape, BIAS switch at HIGH position.
Apply a 400 Hz signal at -8 dB at the LINE IN jacks.
OUTPUT
controls
must
be
at
specified
output
level
setting
(-8 dB at OUTPUT jacks).
Place unit in record mode, monitor switches in the SOURCE
position.
.
Adjust
VR
302/305
for
a
reading
of
0
W
on
the
VU
meters.
(-8 dB at the OUTPUT jacks.)
OVERALL
FREQUENCY
RESPONSE
To avoid saturation of the tape these checks should be made at
least 20 dB below the specified input level. Any bias signal
feeding into the test equipment should be filtered out by ad-
justing the external bias trap. A broad band VIVM may be used
at the output for this adjustment.