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4. ADJUSTMENT PROCEDURE
4-1 MECHANICAL ADJUSTMENT
4-1-1 Wow and flutter (playback method) In both FWD and REV play modes, these measurements should be made at the beginning, middle, and the end of the tape. 1. Connect a wow-and-flutter meter to the LINE OUT. 2. Load and play a TEAC MTT-111N test tape. 3. Check that readings on the wow-and-flutter meter is within 0.19% (JIS WTD). 4-1-2 Tape speed 1. Connect a frequency counter to the LINE OUT. 2. Load a TEAC MTT-111N test tape and play in FWD direction the beginning of the test tape. 3. Adjust each variable resistor to get the following values. Adjustment point HIGH speed LOW speed HIGH speed LOW speed VR2 VR1 VR4 VR3 Adjustment value 6,000 30Hz 3,000 20Hz 6,000 30Hz 3,000 20Hz 4-2-2 Adjustment locations
4-2 ELECTRICAL ADJUSTMENT
4-2-1 Precautions Before performing adjustments and checks clean and demagnetize the entire tape parh. In general, adjustments and checks are made in the order of Lch then Rch. Double REF. Nos. indicate Lch/Rch. (Example ; R11/R21) 0dB is referenced to 0.775V. The AC voltmeter used in the procedures must have an input impedance of 1M or more. Unless specified otherwise, adjustments and checks are made in FWD direction.
PLAYBACK REC/PLAY
Fig. 2-1 4. In play mode, check that the following values are obtained at the beginning and end of the tape. Speed drifting : Within 120 Hz (HIGH speed) Within 60 Hz (LOW speed) 4-1-3 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. Take-up : 30 to 70g-cm Supply : 1.5 to 6g-cm FF/REV : 70 to 150g-cm Fig. 2-2 Torque metter MTT-8111W : Forward torque & back tension MTT-8121W : Reverse torque & back tension MTT-8242 : Fast forward & rewind static torque
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