Smps - Denon AVR-S500BT Service Manual

5.2. A connected USB device is not recognized.
Is a USB hub being used?
Is the USB device supported by this unit?
Are BN912 and BN914 of the USB PCB correctly connected?
Can a voltage (5V) be confirmed 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.

6. SMPS

DC 5V is not output.
Is IC601 (TOP258MG) damaged?
NO
Has a fuse (F6001) broken?
NO
Are there any short circuits caused by
the soldering of the PCB?
NO
Are any parts damaged?
Check the USB device being used
NO
YES
Checking the unit
YES
YES
YES
Replace the IC601 (TOP258MG) and
D6001 - D6004.
YES
Is there the damage in D6001 - D6004?
YES
Repair the short circuited area(s) by the
soldering of the PCB.
YES
Check the damage of each part.
YES
Do not use a USB hub.
This unit supports devices in the FAT16 and
NO
FAT32-formatted mass storage class, MTP-
compatible devices and iPods (with the
exception of some models).
NO
Connect the connectors correctly.
NO
IC905 around circuit of the DIGITAL PCB is
faulty.
YES
YES
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Replace the damaged part(s).
Replace the damaged part(s).