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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 31

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1-10-9
H9741TS
FLOW CHART NO.3
FLOW CHART NO.4
Cassette tape can not be loaded.
Cassette tape is ejected right after the loading.
FLOW CHART NO.5
Cassette tape can not be ejected.
When loading a cassette tape, on Pin(10) of 
IC501, does the "L" pulse switch to the "H" pulse?
When loading a cassette tape, on Pin(10) of IC501, 
does the "L" pulse switch to the "H" pulse?
When loading a cassette tape, on Pin(4) of IC501, 
does the "L" pulse switch to the "H" pulse?
When pressing the eject button, does the Capstan
Motor start rotating?
Refer to "FLOW CHART NO.6 " <The Capstan 
Motor does not rotate>.
Check the Reel Disc or Reel Drive Unit, and 
service it if defective.
Replace IC501.
Replace the Capstan Motor unit.
Replace the Loading Motor unit.
While the Capstan Motor is rotating, is the Takeup
Reel rotating?
Is the Loading Motor rotating?
Check the Cassette Cam or Cassette Gear, etc, 
and service it if defective.
While the Takeup Reel is rotating, is the reel pulse 
signal inputted to Pin(80) of IC501?
While the reel pulse signal is inputting, is "L" pulse 
outputted to Pin(81) of IC501?
Is the specified voltage (approximately 13V) 
outputted to the terminal of the Lading Motor Unit?
When loading a cassette tape, does the LD-SW 
operate normally?
When loading a cassette tape, is the specified 
voltage (approximately 13V) outputted to the 
terminal of the Loading Motor Unit?
Check the line between the start sensor and 
Pin(10) of IC501, and service it if defective.
Replace the Capstan Motor Unit.
Replace the Loading Motor Unit.
Replace IC501.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Check the line between the start sensor and 
Pin(10) of IC501, and service it if defective.
Check the line between the end sensor and 
Pin(4) of IC501, and service it if defective.
Check the line between the LD-SW(SW507) and 
Pin(9) of IC501, and service it if defective.
Check the line between the Takeup Reel sensor 
and Pin(80) of IC501, and service it if defective.
No
No
No
No
No
No
No
No
No
No
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