Sony Walkman Radio Cassette Player WM-FX421 User Manual
Featuring, Getting started, Setting the clock
Press the ENTER
button to enter the
current time setting
Set the time by
using the HOUR/
within ten seconds
To set the hour use the
HOUR button and to set the
minute use the MINUTE
Press the ENTER
button to return to
the current time
• The hour display does not advance even when the minute display
returns to “00” after “59”.
• The hour display is on a 12-hour cycle (U.S.A., Canada and Central
and South America models).
The hour display is on a 24-hour cycle (other models).
The model number is located at the bottom and the
serial number is located inside the cassette holder.
Record these numbers in the spaces provided below.
Refer to them whenever you call upon your Sony
dealer regarding this product.
AVLS (Automatic Volume Limiter System)
The AVLS switch allows you to limit the maximum
volume of your Walkman personal stereo without
degrading the sound quality.
•When the AVLS switch is set to ON (around 85 dB), the
volume will be kept at a moderate level without the
degradation of the sound quality, even if you attempt to
turn the volume up higher.
•When the AVLS switch is set to ON, the playback
sound may be distorted or unstable according to the
music (especially bass boosted part). If this happens,
turn down the volume.
•When the AVLS switch is turned off, you will be able to
enjoy the full volume capability of your Walkman
Using with Batteries
Insert two AA (R6) batteries in correct polarity.
• When you are not going to use your Walkman for a long time,
remove the batteries to prevent damage from battery leakage and
• When the batteries become weak, the sound will be unstable or can
not be heard. In such a case, replace both batteries.
• Replace both batteries while the E indication comes on in the
display, or all the memories will be canceled.
• Concerning the battery life, see “Specifications”.
Using External Power Sources
You can connect the following external power sources
through the DC IN 3 V jack located on the right side.
(When you plug a cord into the DC IN 3 V jack, the
internal batteries are automatically bypassed.)
•House current using an AC-E30HG AC power adaptor
Use only the recommended AC-E30HG
AC power adaptor (not supplied). Do
not use any other AC power adaptor.
Setting the Clock
AA (R6) x 2
DC IN 3V
Insert a cassette.
Select the NORM or
/METAL mode to
match the tape type.
Press the 9 PLAY
Operating the Cassette Player
To wind the tape
Press 0 or ).
To adjust the volume
Set the VOL control.
Press p STOP.
To change sides*
Set DIR to ª or ·.
To play both sides once*
Set MODE to Å.
To play both sides repeatedly*
Set MODE to a.
* FX421/FX421V/FX423/FX425 only
Notes on playing cassettes
• Do not use cassettes longer than 90 minutes except for long
• If the tape is playing but no sound comes out, the batteries may be
weak. Replace all batteries with new ones.
• If your Walkman has not been used for a long time, run the
Walkman for a few minutes before inserting a cassette.
• Do not open the cassette holder while the tape is running.
Using MEGA BASS
Set the MEGA BASS selector to ON to produce deep and
When using MEGA BASS
If the AVLS switch is set to ON, the MEGA BASS effect is
Printed in Malaysia
Sony Corporation © 1995
WALKMAN is a registered trademark of Sony Corporation.
The illustrations in this manual are for the FX425.
The differences in appearance or operation between each
models are described in the respective sections.
Radio Cassette Player
Using DOLBY NR (FX425)
Set theDOLBY NR switch to ON to play Dolby NR
This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no
guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful
interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more
of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and
Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV
technician for help.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
This device may not cause harmful interference, and
this device must accept any interference received,
including interference that may cause undesired
You are cautioned that any changes or modifications not
expressly approved in this manual could void your authority
to operate this equipment.
For the customers in the U.S.A.
Polarity of the plug