7.3 Reproduce Adjustments
7.3.1 Reproduce Head Azimuth Adjustment
1. Turn off the power to the machine.
2. Clean and demagnetize the Heads, Lifters, and Tape Guides. Turn on the
power to the machine.
3. Thread the machine with a 7.5 ips Reproduce Alignment Tape.
4. Set the tape speed to 7.5 ips. Set the RECORD READY button to SAFE
position. Press down the Monitor button to TAPE position.
NOTE: Insert the Headphone Plug into the Phone Jack. Adjust the Monitor Level with
the Output Level Control Knob.
5. Connect one input channel of the oscilloscope to the CH 1 OUTPUT
connector. Connect the other input channel of the oscilloscope to the CH 2
OUTPUT connector. Adjust the oscilloscope to display the input waveforms
as a “lissajous” pattern using the X-Y display function (see Figure 7-3).
6. While reproducing the azimuth adjusting section (500 Hz) of the 7.5 ips test
tape, adjust the azimuth adjustment screw A3 (see Figure 7-2) so that the
lissajous figure becomes a straight line.
7. While reproducing the 16 kHz section of the Test Tape, adjust the azimuth
adjustment screw A3 so that the lissajous figure becomes a straight line.
NOTE: Less and less adjustment is required as the frequency increases to cause the
oscilloscope pattern to become correctly displayed. At higher frequencies, it will be
impossible to achieve a perfectly straight line, some amount of jitter is normal. Adjust
the azimuth screw until the best possible result is obtained.
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