Teac A-7300RX - Phones Output

10-5
SPECIFIED
OUTPUT
LEVEL
AND
MAX.
OUTPUT
LEVEL
SETTINGS
SPECIFIED
OUTPUT
LEVEL:
9.
10.
ll.
Play
the
400
Hz/0
dB
tone
in
section
1
of
test
tape.
Set
the
reference
marks
of
the
OUTPUT
controls
to
the
8
(0
VU)
position.
Adjust
VR-251/252
(on
PLAY
LINE
AMPL.
UNIT)
for
—8
dB
(308
mV)
at
OUTPUT
SOURCE/TAPE
jacks.
MAX.
OUTPUT
LEVEL:
12.
Turn
the
OUTPUT
controls
fully
clockwise
(max.)
and
check
for
—2
dB
(612
mV)
at
OUTPUT
jacks.
13.
Reduce
OUTPUT
controls
until
—8 dB
(308
mV)
is
obtained
on
the
output
VTVM.
NOTE:
This
is
the
Specified
Output
level
setting
.
Do
not
disturb
this
setting
until
the
remaining
adjustments
have
been
completed.
OUTPUT
Fig. 10-6 Specified output controls setting
10-6
VU
METER
LEVEL
SET
14,
Adjust
VR-301/302
(on
METER
PHONE
AMPL.
UNIT)
for
0
VU
reading
on
VU
Meters.
15.
With
METER
SW
in
HIGH,
check
for
-3
VU
+0.5
VU
20
reading
at
upper
scale
on
the
Lower
Scale.
(OVU
£0.5VU
reading
at
upper
scale).
10-7
FREQUENCY
RESPONSE
—PLAYBACK—
—
Tape
SPEED
SW.....
HIGH
(15
ips)
.
Thread
TEAC
Test
Tape
YTT-1004
on
the
unit.
2.
Play
Tape
and
compare
readings
on
VTVM
with
the
re-
oe
sponse limits given in Fig. 10-7.
.
If
adjustment
is
required,
adjust
VR-203/204
(on
PLAY
EQ
AMPL.
UNIT)
for
HIGH
speed.
.
Change
Tape
SPEED
SW
to
LOW
(7-1/2
ips)
position.
.
Thread
a
Test
Tape
YTT-1003
on
the
unit.
. Repeat Step 2.
.
If
adjustment
is
required,
adjust
VR-201/202
(on
PLAY
EQ AMPL. UNIT) for LOW speed.
NOTE:
If
the
frequency
response
does
not
meet
specified
response limits, especially at the high-end of the
spectrum, head should be checked for accumulated
dirt or oxides. If clean, head azimuth must be re-
adjusted.
RESPONSE IN d8
RESPONSE IN 48
1
FREQUENCY IN Hz
= oa TT r
| +- j_} 4-44-44 a
| ‘Low (7-1/2ips)
tity
a
tH
Litt |
a |
=
-
oF
50 00 BK WK 20K ‘SOK
300 1K
FREQUENCY IN Hz
Fig. 10-7 Frequency Response —PLAYBACK —
10-8 PHONES OUTPUT CHECK
1. Connect an 8 ohm non-inductive resistor across the head-
phone (PHONES) jack.
2. Connect VTVM across the resistor, VTYM should indi-
cate —17 dB +1 dB (122 mV—97 mV).
10-9 SIGNAL-TO-NOISE RATIO
—PLAYBACK—
. OUTPUT controls should be at the Sjecified Output,
Level settings.
. Thread a blank YTT-8003 on the unit kaving the tape
outside the capstan and pinch roller.
. Hold the play supply reel stationary and te press the play
(=) button.
. The VIVM connected to the OUTPUT acks should in-
dicate readings listed below.
LOW (7-1/2 ips)
HIGH (15 ips)