Sony D-E350 Operating Instructions

To replace the batteries, open the battery compartment on the back of the player, remove the old batteries, and insert new AA batteries, ensuring the correct polarity.
First, check if the batteries are inserted correctly and have enough charge. If the problem persists, try with new batteries or an AC adapter if available.
Use a dry, soft cloth to gently wipe the lens. For stubborn dirt, use a lens cleaning disc or consult a professional. Avoid using harsh chemicals.
Skipping may be due to scratches on the CD or dirt on the laser lens. Clean the CD and the laser lens. If the issue persists, try using a different CD.
Yes, you can connect external speakers using the headphone jack. Use an appropriate cable to connect to the speaker's input.
The Hold function locks all buttons to prevent accidental presses. Slide the Hold switch to activate or deactivate the function.
To extend battery life, use high-quality alkaline batteries, minimize use of the anti-skip protection, and turn off the player when not in use.
No, the Sony D-E350 is not compatible with MP3 CDs. It only supports standard audio CDs.
Remove the batteries and disconnect any power source for a few minutes, then reconnect them to perform a reset.
Check the battery level and replace if necessary. If the display still does not work, there may be a hardware issue requiring professional repair.