Sony MHC-V4D Operating Instructions Manual page 48

There is severe hum, noise, or
distorted sound.
• If there are obstacles between the
system and your Bluetooth device,
remove or avoid the obstacles.
• If there is equipment that generates
electromagnetic radiation, such as a
wireless LAN, other Bluetooth device,
or a microwave oven nearby, move
them away.
• Turn down the volume of the connected
Bluetooth device.
To reset the system
If the system still does not operate
properly, reset the system to factory
default settings.
Use the buttons on the unit to perform this
operation.
1
Unplug and plug the AC power cord
back in.
2
Press "/1 to turn on the system.
3
Hold down X and ENTER for about
3 seconds.
"RESET" appears in the display panel.
All user-configured settings, such as
preset radio stations, timer, and the
clock are reset to factory default
setting.
Returning the "SETUP" settings to
the default
You can return the "SETUP" settings
(except for "PARENTAL CONTROL"
settings) to the default settings.
1
Hold down SHIFT, then press
SETUP.
2
Press
[SYSTEM SETUP], then press
3
Press
[RESET], then press
GB
48
/ repeatedly to select
/ repeatedly to select
.
4
Press /
[YES], then press
It takes a few seconds to complete. Do
not press "/1 when resetting the
system.
Self-diagnosis Function
When letters/numbers appear in the
display panel
When the self-diagnosis function is
activated to prevent the system from
malfunctioning, a 5-character service
number (e.g. C 13 50) with a combination
of a letter and 4 digits appears on the TV
screen or in the display panel. In this case,
check the following table.
First 3
characters of
the service
number
C 13
C 31
E XX
(XX is a number)
.
repeatedly to select
.
Cause and corrective
action
This disc is dirty.
• Clean the disc with a
soft cloth (page 50).
The disc is not inserted
correctly.
• Restart the system, then
re-insert the disc
correctly.
To prevent a
malfunction, the system
has performed the self-
diagnosis function.
• Contact your nearest
Sony dealer or local
authorized Sony
service facility and
give the 5-character
service number.
Example: E 61 10