Denon UDRA-90 - 15 TROUBLESHOOTING; Common System Problems and Solutions; Condensation and Noise Troubleshooting

[15] TROUBLESHOOTING
1.Check that the connections are proper.
2.Check that you are operating the system according to the instructions in the manual.
Check the following table if the system does not seem to be working properly.
if the problem is not solved after checking these points carefully, the system may be maifunctioning. Switch off the power and
contact your store of purchase.
Symptom
Measures
Power does not come on when
POWER button pressed.
® Power cord not plugged into outlet.
@ Plug cord into outlet properly.
No sound
speakers.
produced from
Common
Treble not produced.
Orientation of sound field not
clear.
@ VOLUME control set to minimum.
@ Headphones are plugged in.
@ Speaker cables not connected to speaker
terminalis.
@ The Relay is affected by clicking noise at
intervals.
@ Turn VOLUME control clockwise ((~}).
@ Disconnect headphones.
@ Connect speaker cables properly.
@ Short-circuit with connection cord near
speaker terminal. Check connection cord
again.
@ Speaker polarities (‘+ and — ) not
matched.
Source other than the desired
one is heard.
Cannot record when REC
MUTE button pressed.
Sound is interrupted during
playback and recording, or tre-
ble sound is low.
®@ Function selector button not set properly.
@ No cassette tape loaded.
@ Accidental erasure prevention tabs of cas-
sette broken off.
@ Head dirty.
© Tape stretched.
@ Connect speaker cables properly.
@ Set to desired function.
@ Load tape.
@ Apply cellophane tape over holes.
@ Clean.
@ Replace tape.
Wow (fluctuation) is heavy dur- | @ Capstans and pinch rollers dirty. @ Clean.
ing playback and recording.
Buzzing noise heard during | @ Noise from TV. ®@ Separate TV from system.
playback. © (Some TVs produce noise.) @ Turn off TV.
Hissing noise heard during FM | @ Antenna not pointed in proper direction. ®@ Change direction of antenna.
reception. @ Signals weak. @ Install outdoor antenna.
@ Turn off TV.
@ Change position of loop antenna.
@ instal! outdoor antenna.
Hissing or scratchy noise heard
during AM reception.
Receiver
Hum noise heard during AM
reception.
Disc loaded but total number of
tracks not displayed.
Operation not performed when
buttons pressed, or playback
stops in middie of track.
CD Player
Sound skips.
@ Noise from TV, etc., or interference from
© other stations.
e
@ Signals coming over power cord are mod-
@ ulated by power source frequency.
@ Plug in cord in opposite direction.
@ Install outdoor antenna.
® Disc loaded upside-down.
® Disc dirty.
@ Non-standard disc loaded.
®@ Disc loaded upside-down.
@ Foreign object in disc holder.
@ Disc dirty.
@ Disc scratched.
@ Dust, fingerprints, or spittle on disc.
@ Disc scratched.
@ Player set in shaky, unstable place.
@ Reload disc.
@ Clean disc.
@ Replace with standard disc.
@ Reload disc.
@ Remove disc and remove foreign object.
@ Clean disc.
@ Replace with non-scratched disc.
@ Clean disc.
@ Replace with non-scratched disc.
@ Set player in stable place.
Buzzing noise mixed in with CD
sound,
24
@ Signals coming over power cord are mod-
ulated by power source frequency.
@ Plug in cord in opposite direction.
Normal operation may not be possibie if there is dirt or
other substances on the surface of the internal objec-
tive lens or sensor.
These parts must be cleaned periodically depending on
the place of installation.
For details, contact your store of purchase.
Dew (Condensation) Phenomenon
Dew (water droplets} may form on the lens of the internal
optical system or on the disc, or on the rotating parts of the
tape deck in situations such as the following:
e Soon after a heater is put on.
e@ When the set is placed in a steamy or damp room.
@ When the set is moved from a cold place to a warm room.
Avoid using ultrasonic humidifiers nearby.
lf ultrasonic humidifiers are used nearby, the calcium,
etc., included in the water may be scattered into the air,
causing white dust to accumulate on the surface of the
objective lens or sensor, resulting in improper opera-
tion.
When Condensation Forms
The signals of the disc may not be read and this product will
not operate properly. To remove the condensation, take out
the disc and switch on the power. The condensation will
evaporate within 1 hour and the set wil! operate normally.
This
system
consists
of
precision
components
using
microprocessors.
Avoid
using
it
in
places
where
there
is
much
external noise. If used is such places, the system may not operate properly, but this is not a problem with the system. If
the system does not operate properly, try performing the desired operation again.