Teac A-7300 - CAPSTAN SHAFT TOLERANCE ADJUSTMENT; TAPE SPEED ADJUSTMENT; FLUTTER MEASUREMENT

CAPSTAN SHAFT TOLERANCE ADJUSTMENT
1. Check that the capstan motor moves ©
i : 2 Capstan Shaft
freely without binding on the Thrust- ‘
plate. li ae
2. Check that the clearance between the
motor shaft tip and the Thrustplate —- Lock Nut
is between 0.1 and 0.3 millimeter. 0.10.3 mm KA
3. To adjust, first loosen the locking tolerance @)
nut; then set with a common screw- Ps x '
Adjustment
driver for approx. 0.2mm clearance. Seraw
Check by observing the capstan move- for Capstan
Shaft
ment.
4, Tighten the Lock Nut and secure with
locking paint.
Fig.
4
Shaft
Tolerance
Adj.
Location
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 (7-1/2ips), YTT-2002
(3-3/4 ips).
These tapes contain a highly
accurate 3000 Hz tone. Connect
a digital frequency counter to
either line OUTPUT jack.
The indicated frequency should be
LOW Speed
0 (®
3000
Hz
(+10
Hz
or
less)
for
Fig.
5
Tape
Speed
Adjusters
both speeds. If necessary, adjust
"adjustable resistors" on the
CAPSTAN MOTOR.
FLUTTER
Flutter should be measured in Playback mode using a TEAC flutter-
free tape YTT-2004 ( l5ips), YTT-2003 (7-1/2ips), 2002 (3-3/4ips)
and Meguro model ymx665B flutter meter. Measurement of flutter
should be made accordance with NAB standards. Values obtained
with different standards of euipment cannot be compared.
Flutter should not exceed. I5ips : 0.10% (RMS) 0.05% (W-RMS)
7-1/2ips: 0.12% (RMS) 0.06% (W-RMS)
3-3/4ips: 0.15% (RMS) 0.10% (W-RMS)
These figures apply to any tape position and direction (such as
full take-up reel, full supply reel or about mid-point).
If there is excessive wow and flutter, examine the pinch roller,
motors, capstan shaft, and reel rest for "grease", "oil",
"dirt" and/or "wear". Also examine the tape counter assy for even-
ness of operation.
Use to
TEST UNIT Tape Speed
FLUTTER FREE TAPE
Test Equipment Set-up