Cleaning The Tape Heads; Troubleshooting; Demagnetizing The Tape Heads - Sony LBT-V3900 Operating Instructions Manual

Cleaning the tape heads

Clean the tape heads after every 10 hours of use.
When the tape heads become dirty
— the sound is distorted
— there is a decrease in sound level
— the sound drops out
— the tape does not erase completely
— the tape does not record
Make sure to clean the tape heads before you start
an important recording or after playing an old tape.
Use separately sold dry-type or wet-type cleaning
cassette. For details, refer to the instructions of the
cleaning cassette.

Demagnetizing the tape heads

Demagnetize the tape heads and the metal parts that
have contact with the tape every 20 to 30 hours of
use with a separately sold demagnetizing cassette.
For details, refer to the instructions of the
demagnetizing cassette.
In case color irregularity is
observed on nearby a TV screen
With the magnetically shielded type of speaker
system, the speakers can be installed near a TV set.
However, color irregularity may still be observed on
the TV screen depending on the type of your TV set.
If color irregularity is observed...
Turn off the TV set once, then turn it on after 15 to
30 minutes.
If color irregularity is observed
again...
Place the speakers farther away from the TV set.

Troubleshooting

If you run into any problem using this stereo
system, use the following checklist.
First, check that the power cord is connected
firmly and the speakers are connected
correctly and firmly.
Should any problem persist, consult your
nearest Sony dealer.
General
The display starts flashing as soon as you
plug in the power cord even though you
haven't turned on the system
(demonstration mode).
•Press DISPLAY/DEMO while the system
power is off.
The demonstration appears automatically
the first time you plug in the power cord,
or if there is a power outage lasting
longer than half a day.
In this case, reset the following:
— Clock setting (see "Step 2: Setting the
time")
— Press DISPLAY/DEMO while the
system is off.
There is no sound.
•Turn VOLUME clockwise.
•The headphones are connected.
•Insert only the stripped portion of the
speaker cord into the SPEAKER jack.
Inserting the vinyl portion of the speaker
cord will interfere with the speaker
connection.
There is no microphone sound.
•Turn VOLUME or MIC LEVEL to adjust
the microphone volume.
•Make sure the microphone is connected
to the MIC jack correctly.
There is severe hum or noise.
•A TV or VCR is placed too close to the
stereo system. Move the stereo system
away from the TV or VCR.
"12:00 AM" flashes in the display.
•A power interruption occurred. Reset the
clock and timer settings.
The timer does not function.
•Set the clock correctly.
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