Pioneer QX-646, Operating Instructions Manual

Page 1: ...OPERATING INSTRUCTIONS Dr roNEEFl ...

Page 2: ...changed check the rating of the fuse A l ampere fuse is to be used for either 220Y or 240V operation and a 2 ampere fuse for 110V 120V or 130V operation If the rating of the fuse is correct replace cap FUSE REPLACEMENT If the fuse blows remove the fuse cap and replace the fuse with a new one 6a b qffiw as a 2 channel receiver until you decide to step up into 4 channel sound by adding two more spea...

Page 3: ...ion Tuning is made easy by the linear FM dial and the signal meter Built in AM Ferrite Bar Antenna Sensitive and highly directional An outdoor AM antenna is not required in most cases TJIONE R Low distortion Audio Amplifier Both tone controls and equalizatlon amplifier operate improved frequency response accuracy and flatness power amplifier is a quasi complementary design a and true circuit const...

Page 4: ...EIVIS B Fig 2 A WORD ABOUT ROOM ACOUSTICS The quality of reproduced iound varies according to the size and shape of the room the materials of walls floor and ceiling and the amount and arrangement of furniture Too harsh or bright a sound usually results from too many hard re flecting surfaces and or too low a ceiling This condition is improved by having ample carpet area or covering the wall espec...

Page 5: ...d it is essential for CD 4 disc record reproduction to use an exclusive cartridge Make certain that the stylus is in position when the phono cartridge is installed and that the stylus goes down vertically onto the record surface when the phono cartridge is replaced so that separation and sound quality remain the same as before RECORD HANDLING Since the groove of the CD 4 disc record is delicately ...

Page 6: ... speaker output terminals CH 3 FRONT SPEAKERS marked R Connect the speaker placed at the rear Ieft to speaker output terminals A CH 2 REAR SPEAKERS marked L on the QX 646 Likewise connect speaker placed at the rear right to speaker output terminals A CH 4 REAR SPEAKERS marked R To connect the other speaker systems to the speaker output terminals B do the same as above Be sure to connect the plus t...

Page 7: ...ge electrical equipment a great deal ol interference tnty enter despite careful antenna selection In such a case talk things over with your audio dealer It mty be advisable to use a 75C coaxial cable between the antenna and the QX 646 Connect to the cable terminal as shown in Fig 7 AIII ANTENNA First tune in an AM station see the explanation on p 14 Then while watching the SIGNAL meter deflect adj...

Page 8: ... deck can be con nected to the REC PB connector DIN type of the QX 646 if an identical connector is provided in the tape deck too The required DlN cable is available at all hi fi and radio stores This single cable completes all playback and recording connections at the same time Use a DlN cable for tape deck to amplifier connection Note that the REC PB connector corresponds to the TAPE REC and TAP...

Page 9: ......

Page 10: ......

Page 11: ...o the extreme left and confirm that sound comes from the front left speaker system CH 1 only Then turn this control to the extreme right and con firm that sound comes from the front right speaker system CH 3 only 5 Turn the FRONT REAR BALANCE control to the right and confirm that sound comes from the rear speaker systems alone 6 Turn the REAR BALANCE control to the ex treme left and confirn that s...

Page 12: ... most pleasing tone NOTES t If your area is far away from the FM station or reception is noisy setting the FUNCTION switch to FM MONO an FM stereo programis received as an FM MONO Program 2 In some countries model QX 646 is delivered with a selector switch for adjusting the FM de emphasis from 50 to 75 psec If your unit is equipped with such a switch at the chassis and if the high sound range give...

Page 13: ... record SIGNAL FOR 30kHz CARRIER LEVEL ADJUSTMENT 3 Listening to the signal 400H2 turn the CARRIER LEVEL CONTROL knob of the QX 646 on the rear panel from the right maximum position to the left 4 Turning the CARRIER LEVEL CONTROL knob to the left find the changing point of tone quality at which the signal becomes distorted Then turn to the right to let the knob adjust at a tuming angle of be tween...

Page 14: ...t the SEPARATION RIGHT control so that the sound volume from the REAR RIGHT CH 4 be comes minimum Iistening to the test record If these checks reveal that the separation adjustments do not function as predicted check all speaker connections There must be a wrong connection somewhere After confirming that operation is normal set these con trols to mid positions CHANNEL CONFIRMATION AND SOUND VOLUME...

Page 15: ...o 2 channel tape decks not including 4 channel tape decks you can duplicate tape to tape or edit recordings while re recording For stereo program with announcements and commercials and later re record on another tape while cutting out unwanted portions For duplicating proceed as follows 1 Connect two tape decks as shown in Fig 20 2 Set the FUNCTION switch to AUX and reproduce a recorded program by...

Page 16: ...The A sound in the figure is reproduced as the audible sound when the stylus tracks the groove TURNTABLE With CD 4 phono cartridge However it is necessary for the B sound to use the demodulator The X signal which contains the B sound is demodulated and the B sound is extract ed from the X signal thereby enabling the B sound to be audible In the actual CD 4 disc record the A and C sound which are a...

Page 17: ...d MATRIX 4 CHANNE L RECORD OR FM BROADCAST REGULAR MATRIX DECODER LF CH I Lr aRr LA CH 2 jL r jBRr RF CH 3 Rr aLr Ra CH 4 iRr jBLr Fig 23 SQ Matrix As shown in the Fig 24 signals L and R from an SQ matrix record or FM broadcast pass through phase shifters and appear as four separate outputs This figure shows that signal L becomes signal Lu CH 1 and that signal Rt becomes signal R CH 3 without any ...

Page 18: ...stance be tween the TV set and receiver Static noise in particular when automobiles run close to the house White noise generated from automobile engi nes High frequency sewing machine or weld ing machine being used near your house ln an area surrounded by hills or high buildings the FM input signals are very weak Thus the noise limiter in the circuit loses its function Set up an FM outdoor antenna...

Page 19: ...gnal at 1 kHz Left Right 50dB Front Rear 30dB Frequency Response 20Hz 15k9z 13dB 12 5d8 100H2 1 1 5d B 8 5d8 1OkHz 40d B position 10d8 100H2 Sae t otuz PIONEER FM Tuner Section Usable Sensitivity lH F Capture Ratio lH F Selectivity lHF Signal to Noise Ratio lmage Rejection lF Rejection Spurious Rejection AM Srrppression Harmonic Distortion Stereo Separation Sub Carrier Suppression Antenna lnput Mu...

Page 20: ...orne Ohmoni nishi Ohta ku Tokyo Japan U A P CINEEFI ELE CTFIG NICA CG FIFGIFIATIG N 178 Commerce Flo id Canlstadt New Jensey O7O72 U S A proNEEFt ELECTFTG NTC EUFICIPE N V Mein centen Mein 21 2OOO Antwenp Belgiurn Prlnted in Japan ARB 081 A 73H03E06J ...