Have a Yashica MP8 player,was a gift,no user manual,have downloaded tunes but cannot get it to play,when I press the play button a lock appears on the screen,any suggestions please?

Certainly! Here is a basic manual for the Aiwa CX-NA777:

1. Powering On and Off To turn the CX-NA777 on, press the Power button located on the top right of the system. To turn it off, press the same button again.
2. Changing the Volume Use the Volume control knob located on the front of the system to adjust the volume. Turn it clockwise to increase the volume and counterclockwise to decrease it.
3. Selecting a Source To select a source, such as the CD player or the radio, use the Function button located on the front of the system. Press it repeatedly until you reach the desired source.
4. Using the CD Player To use the CD player, press the CD button located on the front of the system. Insert a CD into the tray and press the Play button to start playing the CD.
5. Using the Radio To use the radio, select the Radio source using the Function button. Then use the Tuning knob to tune into the desired station. You can also use the Preset buttons to quickly access your favorite stations.
6. Using the Tape Deck To use the tape deck, select the Tape source using the Function button. Then insert a cassette tape into the deck and press the Play button to start playing it.
7. Adjusting the Sound To adjust the sound, use the Bass, Treble, and Balance controls located on the front of the system. These controls allow you to adjust the bass and treble levels, as well as the balance between the left and right speakers.
8. Using the Clock and Timer The CX-NA777 features a built-in clock and timer. To set the clock, press the Clock button and then use the Tuning knob to set the correct time. To set the timer, press the Timer button and then use the Tuning knob to set the desired start and end times.
9. Using the Remote Control The CX-NA777 comes with a remote control that allows you to control the system from a distance. The remote control features buttons for all of the main functions, including Power, Volume, Function, and CD playback.
10. Troubleshooting If you experience any issues with the CX-NA777, such as a CD that won't play or a radio that won't tune properly, consult the user manual for troubleshooting tips. You can also contact Aiwa customer support for further assistance.

Note: This is a basic manual and may not cover all features of the Aiwa CX-NA777. For more detailed instructions, please consult the user manual that came with your system.

with the unit turned off press and hold "8", and then press "x" on the unit until "unlocked" appears on the screen.

This is from page 83 of the manual regarding tray lock feature.

Question edited for clarity.

The manual at page 2 refers.

Setting the Clock
1. With the power off, press the Play/Pause/Memory/Clock button.
The hour on the display will begin blinking.
2. Press the Tune buttons to adjust the hour. Press the Play/Pause/Memory/Clock
3. button again to adjust the minutes.
The minutes on the display will begin
blinking.
4. Press the Tune buttons to adjust the
minutes.
5. Press the Play/Pause/Memory/Clock
button to finish setting the time


https://www.manualslib.com/manual/1052609/Ilive-Ikb333.html?page=2#manual

..

first sorry for the long list but I hope this helps

In addition to playing music, all Sansa MP3 players feature integrated microphones for voice recording.

Polka Dot images/Polka Dot/Getty images

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Like other MP3 players, the SanDisk Sansa series of music and video players lets you listen to your music while on the go. With their easy-to-use control interfaces, Sansa players let you add, change or delete tracks in a playlist quickly. However, there might be times when you want to lock the player so that you don't stop playback or change the current track inadvertently -- like when exercising or jogging. Locking a Sansa player ensures that music plays continuously even if you touch controls on the face of the unit accidentally. To make changes to a queued play list or stop playback on a Sansa with the controls disabled, you must first unlock the player manually.
Sansa Clip Zip and Fuze+ Players Step 1 Press and hold the power button on the Clip Zip or Fuze+ player a few seconds to power on the device. Scroll to "Music" on the home screen and press the "Select" button. The Select button is a rectangular or square button in the center of the button-control pad beneath the viewing screen on the Sansa player.
Step 2 Press the "Play" button to play the first track in your play list. Alternatively, press the right or left arrow button to navigate to another song in the list, and then press the "Play" button.
Step 3 Press the "Power" button on the top of the player once quickly to lock the unit. The player will play music continuously while disabling all navigation controls on the face of the unit. A padlock icon appears on the face of the player indicating the lock feature is active. Don't hold the Power button after you press it, as this will turn off the player.
Step 4 Unlock the player by quickly pressing the "Power" button. The Unlocked icon appears on the player screen.
Sansa Clip+ Step 1 Power on the Sansa Clip+ player.
Step 2 Choose "Music" on the Main Menu screen, then press the "Select" button. The Select button is the square one in the center of the control pad on the face of the player.
Step 3 Press "Play" to begin playing tracks from your play list.
Step 4 Press and hold the "Home" button just below the viewing screen. After a couple of seconds, a padlock icon appears at the top of the viewing screen indicating the Sansa Clip+ locking feature is active.
Step 5 Press and hold the "Home" button again to unlock the Clip+ player.
Tips

• With the Sansa Clip Zip and Fuze+ players, locking the devices disables all navigation controls on the unit (i.e. Play and Fast Forward), but not the volume control. If you lock the Clip Zip or Fuze+, you can still adjust the volume as needed. By contrast, if you lock the Clip+ player, the unit disables all controls on the player -- including the volume control buttons.

References

• SanDIsk: Sansa Clip Zip MP3 Player
• SanDisk: Sansa Clip+ MP3 Player
• SanDisk: Sansa Clip+ MP3 Player User Manual
• SanDisk: Sansa Clip Zip User Manual
• SanDisk: Sansa Fuze+ Mp3 Player User Manual

About the Author Jeff Grundy has been writing computer-related articles and tutorials since 1995. Since that time, Grundy has written many guides to using various applications that are published on numerous how-to and tutorial sites. Born and raised in South Georgia, Grundy holds a Master of Science degree in mathematics from the Georgia Institute of Technology.
Photo Credits

• Polka Dot images/Polka Dot/Getty images

Related Topics:

• Home Theater Systems
• MP3 Players & iPods
• Portable Audio & Headphones
• Speakers
• Stereo Systems & Components

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yes if you can find the + and the - points and a AC charger then yes

Page 55 of the user manual shows a way you may be able to 'reset' the player back to factory defaults and/or if a parental lock has been set and the password is unknown/forgotten:

* Press the STOP button on the front of the unit while you press the STOP button on the remote control-keep pressing both buttons for approximately 3 seconds (until the 'padlock' icon disappears from the front panel display). Release both buttons (the player should be unlocked). If that doesn't work, try resetting the DVD/VCR (instructions are listed below).

* Reset the DVD/VCR: on the front of the unit, press and hold the STANDBY/ON button while you press and hold the STOP button-wait at least 3 seconds before you release both of the buttons.

You'll need to set up your menu preferences because this Reset Procedure returns the DVD/VCR's menus to the factory default settings and also erases the disc library.

( sourced from: http://www.retrevo.com/support/RCA-DRC8295N-DVD-Players-manual/id/402bh648/t/2/ )

You can always go to the above site and download the free pdf of the owner's manual for this model if necessary (follow the prompts).

Give the suggestions a try before considering downloading the documentation.

Try doing a search for "users manuals". There are a lot of sites that have users manuals for different products. Then, look for your Dell mp3 player brand.

You need to read the user manual to solve your problems.

There is a button to unlock the media player.

Regarding to watch your videos in your TV set, you need to use the cables, the cradle and connector inputs (RCA band base type) in your TV set.

Als you can download the user manual from internet if you lost it.

Best regards,

Here is how to manually tune your radio.
1 Press the SOURCE button until a radio
frequency appears in the display.
2 Press the BAND button repeatedly until the
desired radio band is displayed.
Each press changes the band:
→ F1(FM1) → F2(FM2) → AM
3 Press the TUNE button repeatedly until "DX
SEEK" and "SEEK" disappear from the display.
NOTE
The initial mode is DX SEEK.
4 Press the g DN or f UP button to move
downward or upward one step respectively until
the desired station frequency is displayed.
NOTE
The ST indicator or STEREO indicator appears on the
display when a Stereo FM station is tuned in


You can also look at your manual here for any other ? you might have
http://akamaipix.crutchfield.com/Manuals/500/500CDM7874.PDF

Just bought the same unit but the instruction manual was double dutch. After messing around for a while I managed to do it like this. Whe the unit is set to DAB, Press the Sel+/TU+ or the Sel-/TU- button on the unit (not the remote) until the DAB station displays and then press the Select CH+ button again on the unit. Wait a few seconds while the word "tuning" is displayed and that station should now play. To save the station as a preset do this. When the station is playing use the remote and press the PRG/MEM button once. Then press the number for which preset you want that station to be. The station will be saved. EG to save Radio 1 as Preset station 1, play Radio 1, Press PRG/MEM, then press number 1. After that whenever you press number 1 on the remote Radio 1 will play. Do the same with any other station you wish to save. To save station 10 press the 0/10 button on the remote. To save station 11 press 10+ then 1, 12 is 10+ the 2 etc. Good luck Dopeyemma