Sony NF421 User Manual

Even though you have not selected 

“BOOKMARK,”   (Bookmark) 

flashes.

 If you have selected a playback option other than 

“BOOKMARK,”   (Bookmark) flashes.

Play stopped abruptly.

 The off timer has been set.  Change the setting of “TIMER” to 

“OFF” (

 page 24).

 The dry battery is used up completely.  Replace the  dry battery 

with a new LR6 (size AA) alkaline battery (

 page 10).

The TIMER function is canceled.

 The TIMER function for the CD is canceled if you start 

listening to the radio.

 The TIMER function for the radio is canceled if you start 

playing a CD.

You cannot operate the player, 

and a sequence of 8 numbers or 

letters appear on the display of the 

CD player.

 This phenomenon may occur, depending on the CD you are 

using. Remove all power sources, and then insert the battery 
or reconnect the AC power adaptor. Try to operate the player 
again. If the problem persists, consult your nearest Sony dealer.

Radio

The radio is weak or has poor 

quality.

 Replace the battery with a new LR6 (size AA) alkaline battery 

(

 page 10).

 Move the CD player away from electric appliances (TVs, PCs, 

etc.)

 Keep the AC power adaptor away from the CD player.

Others

When closing the lid of the CD 

player, the CD starts to rotate.

 The player is reading the information on the CD, not 

malfunctioning.

D-NF420/NF421.GB.2-318-768-11(1)