Playback Does Not Start; Erroneous Display; An Audio File Cannot Be Played - Sony STR-DH770 Manual

[166] Troubleshooting USB devices

Playback does not start.

Turn off the receiver, reconnect the USB device, and then turn on the receiver.
Connect a compatible USB device.
Select [USB] and select a folder/track, then press
[167] Troubleshooting USB devices
A USB device cannot be connected to the USB port.
The USB device is being connected upside down. Connect the USB device in the correct
orientation.
[168] Troubleshooting USB devices

Erroneous display.

The data stored in the USB device may have been corrupted.
The character codes that can be displayed by this receiver are as follows:
Upper case letters (A to Z)
Numbers (0 to 9)
Symbols (' = < > * + , – . / @ [ \ ] _ `)
Other characters may not be displayed correctly.
[169] Troubleshooting USB devices
[READING] is displayed for an extended time, or it
takes a long time before playback starts.
The reading process can take a long time in the following cases:
There are many folders or files on the USB device.
The file structure is extremely complex.
The memory capacity is excessive.
The internal memory is fragmented.
We therefore recommend following these guidelines:
Folder paths: up to 128 characters long
Total files per folder: 150 or less.
[170] Troubleshooting USB devices

An audio file cannot be played.

MP3 files in MP3 PRO format cannot be played.
to start playback.