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Troubleshooting
4-1-7 Poor PC Connection
Symptom
USB cable is connected to the PC, but no connection is established
1 Check if the 12 MHz Main_clock is functioning normally.
Major Checklist
2 Check if the EXT_PWR (External Power) R522 signal is maintained at 'HIGH' level.
Poor PC Connection
Plug the device into the
USB port.
Is there USB
connection icon displayed
on the LCD?
Yes
Does the unit show
in "My Computer" as a
removable storage?
Yes
Is it accessible?
Yes
Completion
4-14
No
connection established
after a RESET?
No
"Unknown Device" show
in Device Manager?
Recheck after installing
the driver.
No
Can formatting be
done in Explorer?
Is the USB
No
Yes
Is there an
No
Yes
No
Yes
Refer to wave pattern
image of Table 4-7.
2
Check if the EXT_PWR
(External Power) R522 signal
is maintained at
'HIGH' level.
Yes
1
Is 12MHz CLOCK functioning
normally?
No
Can NAND
FORMAT and BOOT Update
be performed
with DFU?
No
Defective
Samsung Electronics
Yes
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