43
Check the USB device being used
YES
Is the USB device supported by this unit?
Is a USB hub being used?
This unit supports devices in the FAT16 and
FAT32-formatted mass storage class, MTP-
compatible devices and iPods (with the
exception of some models).
Do not use a USB hub.
NO
YES
NO
Checking the unit
YES
YES
Can a voltage (5V) be conrmed between pin 1 and pin 4 of JK91 (USB
Connector) on USB PCB?
The circuit between IC901 and JK91 of the USB PCB are faulty.
Are BN912 and BN914 of the USB PCB correctly connected?
IC905 around circuit of the DIGITAL PCB is
faulty.
Connect the connectors correctly.
NO
NO
5.2. A connected USB device is not recognized.
NO
NO
NO
Is IC601 (TOP258MG) damaged?
Is there the damage in D6001 - D6004?
Repair the short circuited area(s) by the
soldering of the PCB.
Check the damage of each part.
Replace the damaged part(s).
Replace the damaged part(s).
Has a fuse (F6001) broken?
Are there any short circuits caused by
the soldering of the PCB?
Are any parts damaged?
Replace the IC601 (TOP258MG) and
D6001 - D6004.
DC 5V is not output.
YES
YES
YES
YES
YES
YES
6. SMPS
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