The TEAC A-1500's Service Manual was instrumental in reviving this classic reel-to-reel. Not only does it have the schematics, exploded parts diagram and parts list, it also provided mechanical adjustment information that approximate factory default settings.
Text excerpt from page 12 (click to view)
C H E C K I N G T H E WAV E F O R M S
To check the waveforms on the SERVO P.W.B., the GND (â) probe of the Osilloscope to â refâ point. NOTES MEASURING DISC : DVD / DVDT-S01 CD / TCD-784A (It is better to use wires for extending between the probe and test points.) â¢ When watching the HF waveform, use the extending wire as short as possible. â¢ When HF waveform is noisy or can not discriminate the eye-pattern, replace the Traverse Unit after measuring the Iop. â¢ Test points 1 ~ $ are shown below.