Teac W-470 - 4 Mechanical Adjustment and Checks; 4-1 Wow and Flutter Measurement; 4-2 Tape Speed Adjustment; 4-3 Reel Torque Measurement

W-470
4
MECHANICAL
ADJUSTMENT
AND
CHECKS
4-1 WOW AND FLUTTER
Note: This measurement should be made at the begining, middle,
and the end of the tape.
PLAYBACK
1, Connect a wow-and-flutter meter to the deck as shown in Fig.
41.
2. Load and play a TEAC MTT-111 test tape.
3. Check that the reading on the wow-and-flutter meter is within
0.38% (RMS).
4.2 TAPE SPEED
1. Connect a frequency counter to the deck as shown in Fig. 4-1.
2. Simply press POWER switch to ON to rotate the motor, then
continue the motor rotation for approx. 1 minute for warmp-up.
3. As soon as the warm-up finishes, load a TEAC MTT-111 test
tape with a 3,000 Hz test tone and play the end of the test tape.
4. Adjust each variable resistor to get the following figures.
Short TP (SPEED ADJ) to get the double tape speed (HIGH
speed),
Never
press
TAPE
SPEED
switch
to
HIGH
position.
[Adjustment point [Adjustment value
aye
HIGH
speed
|
R31
|
6020
~
6040
LOW speed | R32 | 3010 ~ 3020
HIGH ~ 602
REC/PLAY II steed Litas
LOW speed
3000 ~ 3010
* At first, adjust NORMAL tape speed.
5. In play mode, check that the following figures are obtained at
the beginning and at the end of the tape.
fot oan eel LOW speed - HIGH speed
3000 Hz +90, —90 Hz [6000 Hz +180, —180 Hz
Speed drifting | Within 45 Hz | Within90Hz
Frequency Counter
Oscillator
Wow &
Fiutter Meter
DECK
under TEST
R (R)
LINE IN OUTPUT
Fig. 4-1
43 REEL TORQUE
1. Load the cassette torque meter on the deck and read the pointer
indication on the dial scale for each tape transport operation.
The measured torque should be within the following specified
values:
Specifications:
Take-up: 35~70g-cm (0.49~0.970 oz-inch)
Supply: 2.5~6.0g-cm (0.035~0.083 oz-inch)
F.F,/REW: 70~160g-cm (0.970~2.22 02-inch)
4-4 LUBRICATION
Lubrication is only required when parts are replaced. For this pur-
pose, use the oil specified below.
Oil: TEAC spindle oil (from TEAC TZ-255 oil kit),
Mobil D.T.E. Oil Light, or equivalent
Apply a drop of oi! with an oil applicator to a point about 1/3 the
way down the shaft (from the free end) of the flywheel, then insert
the shaft into the capstan housing.
‘ Capstan shaft |
apply a drop of oil here
Capstan flywheel ass’y
Capstan housing
Fig. 4-2
45 VOLTAGE CONVERSION
(General Export Models only)
1. ALWAYS DISCONNECT THE POWER LINE CORD BEFORE
MAKING THESE ADJUSTMENTS! r.
2. Locate the voltage selector on the rear panel.
3. Using a regular screwdriver, turn the selector until the numerals
Corresponding to the voltage requirements of your area appear.
Rear View -
120/220/240V
Fig. 4-3