Teac A-7300RX - Wow and Flutter

8-3
CAPSTAN
SHAFT
TOLERANCE
ADJUSTMENT
Check
that
the
capstan
motor
moves
freely
without
binding
on
the
Thrustplate.
2.
Check
that
the
clearance
between
the
motor
shaft
tip
and
the
Thrustplate
is
between
0.1
and
0.3
millimeter.
3.
To
adjust,
first
loosen
the
locking
nut;
then
set
with
a
common
screwdriver
for
approx.
0.2mm
clearance.
Check
by
observing
the
capstan
movment.
.
Tighten
the
Lock
Nut
and
secure
with
locking
paint.
—
a
Shaft
a a
Tolerance
.1~
0.3mm
Son
Nut
="
@
+ Adjustment
Screw
for Capstan
Shaft
Fig. 8-5 Shaft Tolerance Adj. Location
8-4
TAPE
SPEED
ADJUSTMENT
Place
the
PITCH
CONT
to
the
OFF
position.
The
tape
speed
should
be
measured
using
TEAC
flutter
free
tape,
Model
YTT-2004
(15
ips),
YTT-2003
(7-1/2
ips).
These
tapes
contain
a
highly
accurate
3,000
Hz
tone.
Con-
nect
a
digital
frequency
counter
to
either
line
OUTPUT
jack.
See
Fig.
8-7.
The
indicated
frequency
should
be
3,000
Hz
(+10
Hz
or
less)
for
both
speeds.
If
necessary,
adjust
Tape
Speed
adjusters
on
the
CAPSTAN
MOTOR.
See
Fig.
8-6.
+ Increase
©
LOW 7-1/2 ips ,~
~ @ (®)
Fig. 8-6 Tape Speed Adjustments
Lock Nut
14
8-6 WOW AND FLUTTER CHECK
NOTE: Before performing this measurement, clean the
head and Tape run guides, also check pinch roller
pressure, etc. .
Use new Test Tape if possible for following adjus-
ments.
Values obtained with different standards of equip- -
ment cannot be compared.
PLAYBACK
1. Connect Test equipment to the unit as shown Fig. 8-7.
(Except oscillator).
2. Load TEAC YTT-2004 (for HIGH, 15 ips) or YTT-2003
for LOW, 7-1/2 ips) and playback tape.
3. Read the indication on the Wow and Flutter meter.
4. The Wow and Flutter should be
0.05% or less for 15 ips (WRMS)
0.06% or less for 7-1/2 ips (WRMS)
OVERALL
1. Connect Test equipment to the unit as shown in Fig. 8-7.
2. Load TEAC YTT-8003 (blank tape) Test Tape on the
unit and Record a 3000 Hz input signal.
3. Rewind and playback the recorded signal.
4. The reading on the Meter should be
0.12% or less for 15 ips (RMS)
0.15% or less for 7-1/2 ips (RMS)
NOTE: These figures apply to any tape position (such as
full take-up reel, full supply reel or about mid-
point). Also examine the tape counter ass’y for
evenness of operation.
FREQUENCY COUNTER
OSCILLATOR
DECK wow 8 FLUTTER METER
under TEST
LINE IN
ft)
T-aas
Fig. 8-7 Test Connections for Wow/Flutter and
Tape Speed Test