Teac C-3RX - Tape Speed and Wow;Flutter Calibration; Microswitch Clearance Adjustments

C-3RX
4-5 TAPE SPEED
1.
2.
Connect a frequency counter to the deck as shown in Fig. 4-5.
Play a tape for about five minutes to warm up the deck, then
load a TEAC MTT-111 test tape containing a 3000-Hz test tone
and play the test tape from the beginning.
While the tape is playing, use a common slotted screwdriver with
the handle completely insulated from the blade, and adjust the
control on the capstan motor (as far as possible) for a reading of
3000 Hz (£5 Hz) on the frequency counter.
. Play the tape at the beginning and at the end, and check that the
speed deviation is within the prescribed limits by observing that
the reading on the frequency counter never deviates more than
+45 Hz from 3000 Hz, nor drifts more than 30 Hz at any given
time.
. !f the tape speed is not within the prescribed specifications,
check the pinch roller pressure and the tape transport mechan-
ism for any abnormality, and make sure the tape path is clean.
Frequency Counter
Oscillator
Wow &
Flutter Meter
DECK
[_—_—_junder TEST
{R (
LINE IN
)
OUTPUT
Fig. 4-5
Tape speed control
Fig. 4-6 Tape speed adjustment location
4-6 WOW AND FLUTTER
Note: These measurements should be made at the beginning, middle,
and the end of the tape.
1) PLAYBACK
1. Connect a wow-and-flutter meter to the deck as shown in
Fig. 4-5.
2. Load and play a TEAC MTT-111 test tape.
3. Check that the reading on the wow-and-flutter meter is within
0.08% (WRMS).
2) SIMULTANEOUS RECORD/PLAYBACK METHOD
STANDARD Speed
4. Load a TEAC MTT-501 test tape (blank) and record a 3000-Hz
signal.
5. With the MONITOR switch in the TAPE position, note the read-
ing on the wow-and-flutter meter, it should not be more than
0.25% (RMS).
3) NON-SIMULTANEOUS RECORD/PLAYBACK METHOD
6. Rewind the tape to the beginning of the recorded section pre-
viously made in step 4, and play it.
7. The wow and flutter should not be more than 0.25% (RMS).
4-7 MICROSWITCH (A) ASSEMBLY CLEARANCE
1. Insert a blank cassette and close the cassette holder.
2. Loosen the two screws on the microswitch (A).
3. Move the switch so that actuator of the switch contacts the safe-
ty lever.
4. Adjust the switch position to obtain a clearance of between
0.1 mm to 0.3 mm.
5. Retighten the screws,