Very good reproduction (copy) of original manual. Didn't have a parts list, but schematic was completely labeled with parts. Complete instructions on how to adjust mechanical functions of the 8-track deck. Well worth having and at a very reasonable cost.
Text excerpt from page 56 (click to view)
THE AUDIO CAN NOT RECORD
Is bias level at L104 OK?
Is the voltage at pin 2 of L104 5V?
Check POWER circuit.
Is the voltage at pin 29 of IC3001 about 5V?
L104 is broken or shorted.
Is there audio signal at pin 5 of CP102?
Check the circuit between pin 4 of IC101 to pin 5 of CP102.