CPD-220AS - Sony Monitor Service Manual (repair manual). Page 10

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There are 3 Bass Boost modes from “0” through “2,” and bass is boosted more
at a higher number. The factory setting is “1” (normal mode).
You can enjoy games and music programs with lively sound by selecting  “2.”
When you use the PC phone, select “0.” You will be able to hear the caller’s
voice more easily as the high-pitched tone is reduced.

Press the ≥ button.
The VOLUME/BASS BOOST OSD appears.

Press the > 

 buttons to select the BASS BOOST mode.

+ for higher number
– for lower number

After selecting the Bass Boost mode, you can adjust the volume on the same
OSD.
Press the  . 

 buttons.

+ to increase volume
– to decrease volume

Press the ≥ button again.

✎ 

Tip

If you don’t touch any buttons, the OSD automatically disappears after 10 seconds.
When you want to adjust another item, press the button of the item.  The OSD of the selected item
appears.

This section may help you isolate a problem and as a result, eliminate the need
to contact technical support, allowing continued productivity.

If the u indicator is not lit
m Check that the power cord is properly connected.
m Check that the u switch is in the “ON” position.

If the u  indicator is lit in orange, or alternately in orange and green
m Check that your computer power switch is in the “ON” position.
m The display may recover when you press any key on the keyboard of the

computer.

m Check that the video cable is properly connected.
m Ensure that no pins are bent or pushed in the HD15 connector of the cable.
m Check that the video card in your computer is seated completely in a proper

bus slot.

m Check that the video sync signal is within that specified for the display.
m This display has a self-diagnostics function.  To activate the function, turn off

the computer and the display.  Press and hold the u switch of the display for
about 8 seconds. If the display is operating correctly, the screen will become
white first and then the color bars will appear.

If the u indicator is flashing in orange
m Check that the video sync signal is specified for the display.
m There is a potential display failure. Contact Sony Technical Support.

If the ¤ indicator is lit
m Press the ¤ button to cancel muting.

m Check that the audio plug is properly connected.
m Adjust the volume with . +/– buttons.
m Check that the headphones are not connected.
m Check that the sound board of the computer is properly connected.
m Check that the volume control, muting, sound selector, etc. of the sound

board.  (See the computer’s manual.)

m Check that the MIC plug is properly connected.
m Check that the sound board of the computer is properly connected.
m Check that the microphone control, sound selector, etc. of the sound board.

(See the computer’s manual.)

m Decrease the volume with . +/– buttons, or turn down the microphone

input volume of the sound board.

m Check your graphics board manual for the proper display setting on the

display.

m Check this manual and confirm that the graphic mode and the frequency at

which you are trying to operate is supported. Even within the proper range,
some video boards may have a sync pulse that is too narrow for the display to
sync correctly.

m Trip the u switch once to activate the Auto-degauss cycle*.

m If the refresh rate is not appropriate, the picture may flicker. Set the refresh

rate of the non-interlace mode as high as possible on the computer. For
details on how to set the refresh rate, consult the dealer of your computer or
video board.

m Adjust picture centering, size, or geometry (rotation/ pincushion) on the OSD

(pages 19–22).

m Some video modes do not fill the screen to the edge of the display. There is

no single answer to solve the problem. There is a tendency for this problem
to occur on higher refresh timings.

m Adjust the contrast and brightness on the OSD (pages 17, 18). Some brands

of SVGA boards have an excessive video output level which creates a fuzzy
picture at maximum contrast.

m The GPE setting may not be proper for the picture. Selecting a lower GPE

number may improve the picture (page 25).

m Trip the u switch once to activate the Auto-degauss cycle*.

m Isolate and eliminate any potential sources of electric or magnetic fields.

Common causes for this symptom are electric fans, fluorescent lighting, laser
printers, etc.

m If you have another display close to this display, increase the distance

between them to reduce interference.

m Try plugging the display into a different AC outlet, preferably on a different

circuit.

m Eliminate the use of video extension cables and/or video switch boxes if this

symptom occurs. Excessive cable length or weak connections can produce
this symptom.

Continued to the next page ➔

m These wires stabilize the vertically striped Aperture Grille. The Aperture

Grille allows more light to pass through to the screen giving the Trinitron
CRT more color and brightness.

m Due to the relationship between resolution, display Aperture Grille pitch and

the pitch of some image patterns, certain screen backgrounds, especially gray,
sometimes show moire which looks like wavy lines.  This can only be
eliminated by changing your desktop pattern.

m When the power is turned on, the Auto-degauss cycle* is activated. While the

Auto-degauss cycle is activated, a hum may be heard for about 3 seconds.
This is not a malfunction.

* The Auto-degauss function demagnetizes the metal frame of the CRT to obtain a

neutral field for uniform color reproduction. If a second degauss cycle is needed, allow
a minimum interval of 20 minutes for the best result.

• If the problem persists, call your authorized Sony dealer from a location near

you, or call Sony Technical Support.

• Note the model name and the serial number of your display. Also note the

make and name of your computer and video board.