Very good manual, in depth and complete. Only criticism is that some of the circuit diagrams are slightly blurry and hard to follow for long periods of time, but this is to be expected. Perfect for any maintenance required. Also contains the wiring diagrams of the control cable for constructing extensions.
Detailed SONY CFD980 Service Manual at an easy to find one stop shopping. Make my radio hobby technically interesting. Thanks.
Text excerpt from page 15 (click to view)
AV-14F702
TROUBLESHOOTING GUIDE
NO POWER
Is the voltage at C501 DC24.0V ?
Yes
Check the circuit after C501.
No IC501 Is the voltage at pin 4 of IC501 DC18V ? Yes Check IC501 and associated circuit. 1 No 4 A Is the voltage at the point A in the Figure DC170V ? Yes Broken wire of R501 or short circuit on GND. R501 T501
No
Is the voltage at the point B in the Figure AC120V ?
Yes
Check D501 ~ D504 rectifying circuit. B
D501~D504
No
Is the voltage at the point C in the Figure AC120V ?