This is the second Manual I have ordered from owner-manuals, I give it five stars because it is exactly what I expected given the age of the equipment. So the contents look a bit aged and the pictures a bit grainy, it fulfills my needs and I am glad I can still get hold of them.
Text excerpt from page 42 (click to view)
THE AUDIO CAN NOT RECORD
IS BIAS LEVEL AT T4001 OK ? YES
IS THE VOLTAGE OF T4001 AT PIN 2 5V ? YES
CHECK POWER BLOCK.
IS THERE AUDIO SIGNAL AT PIN 5 OF T4001 ? NO
CHECK A/C HEAD AND CIRCUIT AROUND OF IC4001.
CHECK SNAPPING OF A WIRE IN T4001 AND CIRCUIT AROUND IT.
IS THERE AUDIO SIGNAL AT PIN 80 OF IC4001 ? YES
CHECK THE CIRCUIT FROM TUNER AND AUDIO INPUT JACK TO PIN 80 OF IC4001.