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15 

 

TROUBLESHOOTING                                                                                                                 

   

To determine any problem with your receiver, always check the most obvious possible causes first. If any problem still remains 
after your having checked the items below, consult your nearest dealer. 

Problem 

Probable Cause 

Suggestion 

Amplifier                                                                                                                                                                         

When listening to the music in stereo. 
Left/right speakers reversed. 

Speakers are connected wrong. 

After checking, if needed, reconnect. 

Low hum or buzz sound 

Power cords or lighting placed near this 
product. 

Place this product as far as possible 
from lighting or power leads 

Sound is only heard from one channel 

One of the input cords is disconnected. 
The BALANCE control is set to one side. 

Connect the input leads and 
adjust the BALANCE control. 

Sound cuts off when listening to the 
music or no sound even though power is 
ON. 

Speaker impedance is less than 
prescribed for this unit. 

After turning off the power and then 
turning it on again, reduce the volume or 
change to the correct 8 ohm speakers. 

Low bass response. 

Speaker polarity (+/-) is reversed. 

Check all speakers for correct polarity. 

Tuner                                                                                                                                                                                         

An unusual hissing noise is heard when 
listening to the broadcast in stereo, but 
not heard when listening monaurally.   

A slight noise may be heard because the 
method used for modulation of FM 
stereo broadcasts in different than that 
used for monaural broadcasts. 

Try reducing the treble sound by turning 
the treble controls. 

Noise is excessive in both stereo and 
monaural broadcasts. 

Poor location and/or direction of the 
antenna. Transmitted station is too far 
away. 

Set the 

FM

 mode to monaural by 

pressing the STEREO/MONO button. 
(Note that the broadcast will then be 
heard as monaural sound) 

Sound is distorted and/or the volume 
level becomes low. 

Broadcast signals are poor or poor 
antenna placement 

If an indoor antenna is being used, 
change to an outdoor antenna   

Excessive distortion in speaker output 

Poor reception area 

Try using an antenna with more 
elements. 

Remote Control Unit                                                                                                                                     

The batteries are exhausted. 

Replace with new batteries. 

Remote control not working 

The remote control unit is too far from 
the receiver or out of the effective range. 

Operate the Remote Control unit within 
the effective range 

 
 
 
 
 
 

Содержание PT-990A

Страница 1: ...ENSOR PHONES PHONES STEREO DIRECT STEREO DIRECT CD DVD CD DVD SPEAKER A B SPEAKER A B AUX 1 AUX 2 AUX 1 AUX 2 SPEAKER A B SPEAKER A B DIGITAL IN DIGITAL IN USB USB MD MD PLAYER INPUT PLAYER INPUT STER...

Страница 2: ...NING 4 FRONT PANEL INFORMATION 5 REMOTE CONTROL INFORMATION 6 REAR PANEL INFORMATION 7 CONNECTIONS LOUDSPEAKER CONNECTIONS 8 AUDIO CONNECTIONS 9 DIGITAL CONNECTIONS 9 FRONT INPUT CONNECTIONS 10 AERIAL...

Страница 3: ...lectric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literat...

Страница 4: ...to a child or adult as well as serious damage to the product Any mounting of the product should follow the manufacture s instructions and use a mounting accessory recommended by the manufacturer A pr...

Страница 5: ...his product ask the service technician to perform safety checks recommended by the manufacturer to determine that the product is in a safe operating condition 17 HEAT DISPERSION Leave at least 10 cm o...

Страница 6: ...different types of batteries together Rechargeable and non rechargeable batteries can be used Refer to the precautions on their labels When the remote control unit is not to be used for a long time m...

Страница 7: ...dicator Lights green when the amplifier is turned on Lights red when the amplifier is in standby mode or in operation 10 MASTER VOLUME Rotate this knob clockwise or counterclockwise the master volume...

Страница 8: ...t press this button to stop the playback 13 Tuning When select the built in tuner press it to tune frequency down When insert a MP3 player in the USB port press this button to select the previous trac...

Страница 9: ...tput terminals on the DAB player 5 PCM DIGITAL IN Optical in 1 2 PCM Digital audio input to the digital output of CD player Coaxial In 1 2 PCM Digital audio input to the digital output of a CD player...

Страница 10: ...ack terminals are the negative terminals l The side of the speaker cable is marked to make it distinguishable from the side of the cable Connect this marked side to the red terminals and the unmarked...

Страница 11: ...n the mains power lead or turn on the unit before all connections have been made Connect to source equipment using phono cables stereo 2RCA 2RCA DIGITAL CONNECTIONS Two types of digital audio connecti...

Страница 12: ...10 CONNECTION FRONT INPUT CONNECTIONS The front panel iPod input is for temporary connections to the iPod player...

Страница 13: ...mended using a 75 ohm outdoor FM aerial AM loop aerial Connect each end of the single length antenna to the antenna terminals Place the antenna as far from the main system as possible to prevent unwan...

Страница 14: ...Pod player It can connect a iPod player directly or connect to a iPod docking Balance Bass Treble control knob BALANCE control is used to adjust the level of speaker BASS control is used to adjust the...

Страница 15: ...step FM 50 kHz steps MW 10 kHz steps Two FM modes available Press ST MONO button on remote control to select Stereo mode or Mono mode Stereo FM stereo broadcasts are received in stereo and the 8 indic...

Страница 16: ...ch service c CT Clock Time Press DISPLAY on remote control then WAITING CT will appear The current time from Radio Station will be shown e g 15 30 Note 1 The Clock Time will be only transmitted from l...

Страница 17: ...ker polarity is reversed Check all speakers for correct polarity Tuner An unusual hissing noise is heard when listening to the broadcast in stereo but not heard when listening monaurally A slight nois...

Страница 18: ...ise ratio 110 dB Analog In Channel Separation 70dB Audio Analogue input Senstivity Impedance 200mV 47 Kohm Tuning Range FM 87 5 MHz 108MHz AM 530 kHz 1710 kHz FM preset 20 station AM preset 10 station...

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