It is pretty good. The schematics were covered all components, the manual also provide the parts list . It's useful for the trouble shooting.
Text excerpt from page 8 (click to view)
1-2. Circuit Description
�Vb1� CH-1/2 input validity error (Sub-frame B) This error occurs when the validity flag of the CH-2 AES/EBU digital audio signal input to IC202 is defective. �VA3� CH-3/4 input validity error (Sub-frame A) This error occurs when the validity flag of the CH-3 AES/EBU digital audio signal input to IC203 is defective. �Vb3� CH-3/4 input validity error (Sub-frame B) This error occurs when the validity flag of the CH-4 AES/EBU digital audio signal input to IC203 is defective. �SY1� CH-1/2 input sync error This error occurs when the CH-1/2 AES/EBU digital audio signal input to IC202 is not synchronized. �SY3� CH-3/4 input sync error This error occurs when the CH-3/4 AES/EBU digital audio signal input to IC203 is not synchronized. �nS1� CH-1/2 input no-signal error This error occurs when a CH-1/2 input AES/EBU digital audio signal is not detected by IC202. �nS3� CH-3/4 input no-signal error This error occurs when a CH-3/4 input AES/EBU digital audio signal is not detected by IC203. �FA1� CH-1/2 input FS error (Sub-frame A) This error occurs when the channel status of the CH-1 AES/EBU digital audio signal input to IC202 does not contain a sampling frequency of 48 kHz. �FA3� CH-3/4 input FS error (Sub-frame A) This error occurs when the channel status of the CH-3 AES/EBU digital audio signal input to IC203 does not contain a sampling frequency of 48 kHz. �Fb1� CH-1/2 input FS error (Sub-frame B) This error occurs when the channel status of the CH-2 AES/EBU digital audio signal input to IC202 does not contain a sampling frequency of 48 kHz. �Fb3� CH-3/4 input FS error (Sub-frame B) This error occurs when the channel status of the CH-4 AES/EBU digital audio signal input to IC203 does not contain a sampling frequency of 48 kHz. �nA1� CH-1/2 input non-audio data (Sub-frame A) This error occurs when the bit of non-audio data is set in the channel status of the CH-1 AES/EBU digital audio signal input to IC202. �nA3� CH-3/4 input non-audio data (Sub-frame A) This error occurs when the bit of non-audio data is set in the channel status of the CH-3 AES/EBU digital audio signal input to IC203.
