The service manual is as described and received the link to the download sooner than expected. Great service, quality product. This site is a big help in the electronics repair business.
Text excerpt from page 83 (click to view)
TROUBLESHOOTING GUIDE
THE AUDIO CAN NOT RECORD
NO Is bias level at L101 OK? YES
In starting recording, is there sine wave at pin 11 of IC101? YES
NO
Check POWER BLOCK and voltage of base of Q103.
Check disconnection and short of L101.
Is there audio signal at pin 76, 78 and 80 of IC101? YES
NO
Check IC701 and the circuit from TUNER or audio input jack to IC701 .