Sony MHC-W55 - Manuel (Page 27)

27
EN
For Your Information
Insert a tape when the areas cleaned are
completely dry.
To demagnetize the tape heads
After 20 to 30 hours of use, enough residual
magnetism will have built up on the heads
to begin to cause loss of high frequencies
and hiss. At this time, demagnetize the
heads and all metal parts in the tape path
with a commercially available tape head
demagnetizer. Refer to the instructions of
the demagnetizer.
To clean the cabinet
Use a soft cloth slightly moistened with
mild detergent solution.
To clean the CD
When a CD is dirty, clean it with a cleaning
cloth. Wipe the CD from the center out.
Notes on CD
•Do not use solvents such as benzene,
thinner, commercially available cleaners,
or antistatic spray intended for vinyl LPs.
•If there is a scratch, dirt or fingerprints on
the CD, it may cause a tracking error.
Specifications
CD player section
System
Compact disc digital
audio system
Laser Semiconductor laser
Wavelength 780 – 790 nm
Frequency response
2 Hz – 20 kHz (±0.5 dB)
Signal-to-noise ratio
More than 90 dB
Dynamic range More than 90 dB
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength 600 nm
Output Level –18 dBm
The tape does not record nor
playback or there is a decrease in
sound level.
➔ The heads are dirty. Clean them.*
➔ Magnetic deposits have built-up on
the record/playback heads.*
There is excessive wow or flutter, or
the sound drops out.
➔ The capstans or pinch rollers are
contaminated.*
The tape does not erase completely.
➔ Magnetic deposits have built-up on
the record/playback heads.*
Noise increases or the high
frequencies are erased.
➔ Magnetic deposits have built-up on
the record/playback heads.*
* See “Maintenance.”
CD Player
The disc tray does not close.
➔ The CD is not placed correctly.
The CD will not play.
➔ The CD is dirty.
➔ The CD is inserted label side down.
➔ The player is in pause mode.
➔ Moisture condensation has built
up.
Leave the system turned on for
about an hour until the moisture
evaporates.
“NO DISC” is displayed.
➔ There is no CD in the player.
Play does not start from the first
track.
➔ The player is in program or shuffle
mode. Press PLAY MODE so that
“PROGRAM” or “SHUFFLE” goes
out.
General
There is no sound.
➔ Rotate VOLUME clockwise.
➔ The headphones are connected.
Disconnect them.
Sound comes from one channel or
unbalanced left and right volume.
➔ Check the speaker connections of
the inoperative channel.
The left and right sound are
reversed.
➔ Check the speaker connection and
speaker placement.
Bass is lacking or the location of the
musical instruments is apparently
imprecise.
➔ Check the speaker connection for
proper phasing.
There is severe hum or noise.
➔ A TV or VCR is too close to the
stereo system. Move the stereo
system away from the TV or VCR.
“12:00 AM” or demo display flashes
in the display.
➔ A power interruption occurred. Set
the clock and timer settings again.
The remote does not function.
➔ The batteries have run down.
Replace both batteries.
➔ There is an obstacle between the
remote and the system. Remove the
obstacle.
Restoring the factory
settings
1 Turn SYSTEM POWER off.
2 Hold down both FUNCTION and
ENTER/NEXT, then release.
3 Press MENU 3 within 2 seconds of
releasing FUNCTION and ENTER/
NEXT.
Maintenance
To clean the tape heads and tape
path
Contaminated tape heads cause poor
recording or sound drop-out in playback.
We recommend cleaning after every
10 hours of operation.
Open the tape compartment and wipe the
heads, the pinch rollers and the capstans
with a cleaning swab slightly moistened
with cleaning fluid or alcohol. Wipe the
parts shown below:
Capstan
Pinch roller
Record/playback
head
Erase head
Deck B Cleaning
swab
Cleaning
swab
Deck A
Playback head
Pinch roller
Capstan