Sharp CD-DD4500 Service Manual Download

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CD-DD4500

Troubleshooting Chart

Many potential “problems” can be resolved by the owner without calling a service tech-
nician. If something is wrong with this product, check the following before calling your
authorized SHARP dealer or service center.

Tuner

Symptom

Radio makes unusual noise con-
secutively.

Possible cause

Is the unit placed near the TV or com-
puter?
Is the FM/AM loop antenna placed prop-
erly?
Move the AC power cord away from the
antenna if located near.

General

Symptom

The clock is not on time.

When a button is pressed, the unit
does not respond.

No sound is heard.

The balance between the left and
right channels is bad.

Hum or excessive noise.

No sound is heard, or the sound
is too low, from the center or sur-
round speakers.

The TIMER indicator is flashing.

CD player

Symptom

Playback does not start.
Playback stops in the middle or is
not performed properly.

Playback sounds are skipped, or
stopped in the middle of a track.

Possible cause

Is the disc loaded upside down?
Does the disc satisfy the standards?
Is the disc distorted or scratched?

Is the unit located near excessive vibra-
tions?
Is the disc very dirty?
Has condensation formed inside the
unit?

Possible cause

Did a power failure occur?
Reset the clock.

Set this unit to the power stand-by mode
and then turn it back on.
If the unit still malfunctions, reset it.

Is the volume level set to “0”?
Are the headphones connected?
Are the speaker wires disconnected?

Are the front and surround speakers
connected to the correct left and right
channels?
If an external unit is connected, are the
left and right channels connected prop-
erly?

Is the speaker cord plugged in correctly?
Does the speaker cord run past other
electronic equipment?
Are the plugs or terminals dirty?

Is the “SP SIZE” item set to “NO” in the
“SET UP” operation?
Is the volume too low?

Is the speaker wire shorted?
Was the unit used at high volume for
many hours?

Cassette deck

Symptom

Cannot record.

Cannot record tracks with proper
sound quality.
Cannot erase completely.

Sound skipping.

Cannot hear treble.
Sound fluctuation.

Cannot remove the tape.

Possible cause

Is the erase-protection tab removed?

Is it a normal tape?
(You cannot record on a metal or CrO

tape.)

Is there any slack?
Is the tape stretched?
Are the capstans, pinch rollers, or heads
dirty?

If a power failure occurs during playback,
the heads remain engaged with the tape.
Do not open the compartment forcibly.
Wait until electricity resumes.

Remote control

Symptom

The remote control does not op-
erate.

Possible cause

Is the AC power cord of the unit plugged
in?
Is the battery polarity respected?
Are the batteries dead?
Is the distance or angle incorrect?
Does the remote control sensor receive
strong light?

Condensation

Sudden temperature changes, storage or operation in an extremely humid envi-
ronment may cause condensation inside the cabinet (CD pickup, tape heads,
etc.) or on the transmitter on the remote control.
Condensation can cause the unit to malfunction.
If this happens, leave the power on with no disc (or cassette) in the unit until
normal playback is possible (about 1 hour). Wipe off any condensation on the
transmitter with a soft cloth before operating the unit.

Connecting DVD player

Symptom

Although a DVD player is con-
nected, no sound is heard.

Possible cause

Is the power to the DVD player con-
nected properly?
Is a digital signal being output from the
DVD player?
Is “DVD NO” being displayed?
Does the type of DVD digital signal ap-
pear in the display?
Since “DVD---” is not output from the
Dolby digital source, it cannot be
decorded.
Is a Dolby digital 2/0 (monaural) signal
being played with the surround mode set
to NORMAL and without a center
speaker connected?

If trouble occurs

When this product is subjected to strong external interference (mechanical shock, ex-
cessive static electricity, abnormal supply voltage due to lightning, etc.) or if it is oper-
ated incorrectly, it may malfunction.

If such a problem occurs, do the following:

. Set the unit to the stand-by mode and turn the power on again.

. If the unit is not restored in the previous operation, unplug and plug in the

unit, and then turn the power on.

Note:

If neither operation above restores the unit, clear all the memory by resetting it.