Troubleshooting Flow Chart - Panasonic JU-475-4 Service Manual

6.2 Troubleshooting Flow Chart
Table6-1 Troubleshooting Flow Chart
Problem
Remains the Same after NO Diskette
Replacing with Good
Defective
Seek
NO
Diskette7 Operation
OK?
YES
YES
Problem z
Remains the YES Controller Write SW On
Same after Replacing Defective
with Good
FDD2
NO Write
Waveform NO
Run the operating svstem and er Pee
check. Record all diagnostic E
information on tracks and sectors
as far as the program permits.
YES
Write SW Off
install Exerciser on FDD
Power SW YES Read
Waveform
DCSW On on Oscilloscope
Drive Select SW OK?
Head load SW >
On
NO
Index
tame NO Check item 1, OK after BO
Flashes? Table 6-2 head cleaning?
YES YES
1/0 34pin NO Check Item 2 FDD online test
signal output Table6-2 `
OK?
YES Read YES
Error, CRC
Recal SW
Error?
On
NO
FDD
Track 0 NO Check kem 3. IN USE LED NO
Lamp Lights at Table 6-2 Lights?
Track 0?
YES YES
(When Head Load option)
Write NO
Head Load
Operation OK?
NO Check Item 4,
Table 6-2
YES YES
Protect Lamp
Lights?
END
Check Item 5,
Table 6-2
Check Item 6,
Table 6-2
Check Item 7,
Table 6-2
Check Item 8,
Table 6-2
Check item 9,
Table 6-2
Check Item 10,
Table 6-2