DV-NC100H. Cover, Contents, , Laser beam safety precautions, Important safeguards and precautions, Standard notes for servicing, Preparation for servicing, Operating controls and functions, Cabinet disassembly instructions, Electrical adjustment instructions, Firmware renewal mode, Troubleshooting, Block diagrams, Function indicator symbols, Main Schematic diagram 1 9. - Sharp DVD Service Manual (repair manual). Page 35

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1-10-13
H9741TS
FLOW CHART NO.13
Hi-Fi audio can not be playbacked normally. (Hi-Fi E-E mode is normal.) 
FLOW CHART NO.14
Hi-Fi audio can not be recorded normally in the linear audio mode. (E-E mode is normal.) 
Is the audio signal inputted into Pin(13,15,17) of IC301?
Does the Bias oscillation circuit operate normally?
Is the audio signal outputted to Pin(11) of IC301?
Is the Playback Envelope signal outputted to 
Pin(33) of IC451?
Replace IC301.
Is CN504 and the connected cable normal?
Is the Hi-Fi-H-SW signal inputted into Pin(39) of IC451?
Yes
Yes
Yes
Is the audio signal outputted to Pin(100) of IC301?
Yes
Yes
Replace ACE head.
Yes
Yes
No
No
No
No
Check the Hi-Fi-H-SW line between 
Pin(39) of IC451 and Pin(19) of 
IC501, and service it if defective.
Check the line between Pin(78) of IC451 and 
Pin(13,15,17) of IC301, and service it if defective.
Check the Bias oscillation circuit (Q401,Q403,
Q404,Q405,Q406) and service it if defective.
Replace 
IC451.
Replace IC451.
No
Replace IC301.
No
Replace CN504 and the connected cable.
No
FLOW CHART NO.12
Hi-Fi audio can not be recorded normally. (E-E mode is normal.) 
Is the REC FM signal outputted to Pin(26) of IC451?
Is the line between Pin(8) of CN251 and 
Pin(26) of IC451 normal?
Replace the Cylinder Assembly.
Yes
Yes
No
Replace IC451.
No
Check the line between Pin(8) of CN251 and 
Pin(26) of IC451, and service it if defective.

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