Teac V-870 - Reel Torque Checks and Adjustments; Tape Speed Adjustment; Wow and Flutter Checks

4-3 REEL TORQUE CHECKS AND ADJUSTMENTS
1. Using a cassette torque meter, check that reel torque at each
tape transport operation is within the following specified range.
25 ~ 60g-cm
{0.34 ~ 0.83 02-inch}
Fast Forward/ 90 ~ 160 g-cm
Rewind (1,25 ~ 2.22 02-inch}
*Back Tension
ft. Connect a BC voltmeter between TP.4 and TP.GND on the
main PC board.
2. Play the middle part of test tape MTT-5511 and adjust R42
so that the voltmeter: shows the values in the above table.
4-4 TAPE SPEED ADJUSTMENT
1, Connect a frequency counter to the deck as shown in Fig, 4-7.
2. Playing the mid portion of an MTT-111 test tape, adjust the
semi-fixed resistor on capstan motor so that tape speed
becomes 3,000 Hz «5 Hz. An insulated and non-metallic
flat-head screwdriver should be used for this adjustment.
3. Check that the following values are obtained at the beginning
and at the end of the tape.
Deviation: 3,000 Hz +45 Hz
Width of deviation: Within 30 Hz
4-5 WOW AND FLUTTER CHECKS
Note: These measurements should be made at the beginning,
middie and the end of the tape.
4-5-1 PLAYBACK METHOD
1. Connect a wow and flutter meter to the deck as shown in
Fig. 4-7. . .
2. Load a TEAC MTT-111 test tape or equivalent and, play it to
measure the wow and flutter value.
3. Specifications are shown belaw.
0.05% WRMS
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