Pioneer-SX-1010-Service-Manual (1)电路原理图.pdf

(ART-O43- SERVICE MANUAL STEREO RECEIVER ex -1010 KCU, F, GN NOTE: MODEL SX-I0I0 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS: Round label on Voltage Type rear panel KCU120V only UL (U.) and CSA (Canada) approved. llOV, 120V, 130V General export model. 220V and 240V (Switchable) 220V only SEMCO (Sweden), NEMCO (Norway), DEMCO (Denmark) approved. (74BO2M61 D)C,D PIONEER RadioFans.CN 收音机爱 好者资料库 8X-1C10 CONTENTS About 220V only model labeled GNu This model whose rear panel is labeled GNu circular mark operates only on 220V substantially in its circuit design from two other models. When repairing this model please see the manual on page 75 and the followings which include such items as Circuit connection diagram, Miscellaneous parts list, Schematic diagram of power supply circuit assembly, P.C. board pattern and its parts list. Before servicing, also please do not fail to check to see if the GN mark is labeled on the rear panel. SPECIFICATIONS. FRONT PANEL FACILITIES .,. 5 CONNECTION DIAGRAM .,. 7 BLOCK DIAGRAM. . CIRCUIT DESCRIPTION . DIAL CORD STRINGING. . DISASSEMBLY . PARTSANDP.BOARDLOCATIONS. 14 LEVEL DIAGRAM. . ALIGNMENT PROCEDURE 10.1 English. 10.Abgleichverfahren . EXPLODEDVIEWANDPARTSUST. 20 SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LIST 12.Circuit Connection Diagram and Miscellaneous Parts. . . . . . . . . . . . . . 12.2 FM Front End (AWB-017). 32 12.3 Tuner Assembly (AWE-040). 33 12.4 Muting Circuit Assembly (AWM-O39). . 12.Equalizer Amplifier Assembly (AWF-013) . . . . . . . . . . . . . . . . . . . . . . . 12.6 Control AmplifierAssembly(AWG-O27). . 12.7 Power Amplifier Assembly (AWH-O32) . . . . . . . . . . . . . . . . . . . . . . . . 12.Protection Circuit Assembly (AWM-062) . . . . . . . . . . . . . . . . . . . . . . . . 12.9 Power Supply Circuit Assembly (AWR-053) . . . . . . . . . . . . . . . . . . . . 12.10 Power Supply Circuit Assembly (AWR-O54) . . . . . . . . . . . . . . . . . . . . . 12.11 Switch Circuit Assembly (AWS-064) . 12.12 Switch Circuit Assembly (AWS-068) . 12.13 Switch Circuit Assembly (AWS-069) . 12.14 Switch Circuit Assembly (AWS-070) . 12.15 Switch Circuit Assembly (AWS-071) . 12.16 Switch Circuit Assembly (AWS-O72) . 12.17 5PConnectorAssembly(AWX-062) . PACKiNG METHOD AND PART NUMBERS . 71 SCHEMATIC DiAGRAMS, P.C. BOARD PATTERNS AND PARTS LIST FOR 220V ONLY MODEL 14.1 Circuit Connection Diagram and Miscellaneous Parts. . . . . . . . . . . . . . . . 75 14.2 Power Supply Circuit Assembly (AWR-063) . . . . . . . . . . . . . . . . . . . . . . 10. 11. 12. 13. 14. RadioFans.CN 收音机爱 好者资料库 1 SPECI FI CATIONS SEM!CONDUCTORS EETs . 3 ICs . 5 Transistors . 73 Diodes . 41 AMPLIFIER SECTION Continuous Power Output 20Hz20kHz (Both channels driven) . WOW + 100W (8,Q), W5W + 105W (4,Q) 1kHz (Both channels driven) . 110W + 110W (S,Q), 110W + 110W (4,Q) Harmonic Distortion (20Hz20kHz Continuous Power Output) . Less than 0. (IW + 1W, Power Output) . Less than 0.05% I ntermodulation Distortion (Continuous Power Output) . Less than 0. (IW + 1W, Power Output) . Less than 0.05% Power Bandwidth (I H F, Both channels driven) . 5Hz40kHz (T.D. 0.1%) Frequency Response . 7Hz100kHz I nput Sensitivity/I mpedance POVlfER AMP IN . 1V/50k,Q Output Speaker . A, B, C, A + B, A + C, B + C (4,Q16,Q) Headphone . 4,Q16,Q Damping Factor (1 kHz8,Q) . More than 50 Hum iIl come into operation. However, operating all three button even though depressed at the same time is not possible. 2. Only when listening through headphones, press again the SPKR button(s) in us to OFF (undepressed) from the ON position (pressed). POWER SWITCH Turn this switch ON but wait for some 3 to 6 seconds during the silence of which the protection circuit elimi- nates the unpleasant noise not imputed to a receiver fault. PHONES (1, 2) OUTPUT JACKS Accept two pairs of headphones. BASS CONTROLS Adjust bass tone quality. 100Hz. . . For the low frequencies below 400Hz. Possible up to lOdB of increasing or reducing at 100Hz in 2dB steps. 50Hz. . . . . . After adjustment by the 100Hz control further adjust frequencies below 80Hz by this control, if necessary. Possible up to 5dB of increasing or reducing in bass response at 50Hz in 2.5dB steps. LOW CUT, HIGH CUT BUTTONS LOW. When the low-pitched rumble (turntable motor or other source) is obtrusive, de- press the LOW CUT button to ON. In no interference, leave it undepressed (OFF). When the high frequency scratch noise (records or other source) is much, depress this button to ON. In no interference leave it undepressed (OFF). HIGH TONE SWITCH When in the ON (up) position, this switch causes the amplifier section to operate with a flat frequency regard- less of the tone control settings. Use this switch to check the audio characteristics of your listening room such as when it is necessary to check the tone quality of phono cartridges and speakers and also to particularly set the tone controls to be assessed. SIGNAL METER FM TUNING METER While getting the SIGNAL meter needle going to the right make fine adjustment with the FM TUNING meter whose needle comes to the center (indicating the optimum reception). For AM and FM station tunings AM tuning: Tune the dial pointer so that the SIGNAL meter needle comes to the extreme right. Both the SIGNAL and FM TUNING meters work together. The optimum point of the SIGNAL meter needle is the same as in AM tuning. Then use the FM TUNING meter. FM tuning: -FM STEREO INDICATOR TUNING KNOB .,. 0 -do. .00 AUDIO MUTING BUTTON -20dB Depress this button to mute the audio input to -20dB. No need to turn down the VOLUME control on each BALANCE CONTROL Adjusts the balance between the sound volume from the left and right speaker systems. occasion for your convenience. DOLBY NR ADAPTOR SWITCH When employing Dolby Noise Reduction Adaptor, depress this DOLBY NR ADAPTOR to ON. TREBLE CONTROLS Adjust treble tone quality. 10KHz. For the high frequencies above 2.5kHz. Possible up to 10dB of increasing or reducing in treble response at 10kHz in 2d B steps. . After adjustment by the 10KHz control further adjust frequencies above 12KHz by this control, if necessary. Possible up to 5dB of increasing or reducing in treble response at 20kHz in 2.5dB steps. 20KHz 4CH ADAPTOR SWITCH When using the 4-channel rear amplifier connected to the 4CH jacks on the rear panel, depress this 4CH ADAPTOR to ON. TAPE MONITOR (12) SWITCHES Monitor the recorded sound while recording with a tape deck. Also possible to play back tapes as follows: 1 . . . With a tape deck connected to the TAPE 1 jacks (REC and PB), either monitoring of recording in progress or playing back is possible. . . With a tape deck connected to the TAPE 2 jacks (REC and PB or REC/PB con- nector), the same as in 1 above is possi- ble. TAPE DUPLICATE SWITCH Leave this switch in the ON (down) position to duplicate or edit a recorded tape using two tape decks. For normal use, switch over to the OFF (up) position. FUNCTION SELECTOR BUTTONS For selecting the program source, push each button as follows: AM. . . . . For AM broadcast reception. For FM broadcast reception. The STEREO indicator lights up when the broadcast is in stereo. PHONO 1 . For operating a turntable connected to the PHONO 1 input jacks. For operating a turntable connected to the PHONO 2 input jacks. . . . For using a microphone. Not possible to mix with other program source. For listening to audio equipment (car- tridge tape player, TV sound tuner, etc. connected to the ALJX input jacks. PHONO 2 MIC AUX DIMMER SWITCH Dims the brightness of the indicator light. Press again to restore full brightness. FM MUTING BUTTON Leave this button undepressed (in the ON position) while tuning in FM stations. Inter-station noise may interfere with FM reception while tuning between stations. To suppress this noise, leave the MUTING button undepress- ed (in the ON position). If the low signal strength is due to distance from the transmitter or other influences depress this button, at which the weak station will be heard with the MUTING OFF. MODE BUTTON Leave this button undepressed (if necessary, depress this to release it when already depressed) for STEREO playback. For MONO playback, depress it. In this case stereo signals for left and right channels will be mixed into mono signal which will be heard from the center of both speaker systems. LOUDNESS BUTTON Depress this button to listen at low volume. The human ears frequency response varies according to the listening volume. The depressed button compensates for hearing response with emphasis on the bass and treble. MIC INPUT JACKS , R . . . . For connecting the left and right channel microphones. NOTE: Use the high impedance (above 20M2) with 6mm diam. phone plug,. VOLUME CONTROL Governs both the volume of sound outputs from the speaker systems and from the headphones. CONNECTION DIAGRAM OUTDOOR FM ANTENNA GROUND TYPE FM ANTENNA 300n feeder 75n : coaxial: cable (;) FM DE-EMPHASIS SWITCH I n some countries. the receiver is delivered with a selector switch for adjusting the FM de-emphasis from 50 to 75!lsec. If your unit is equipped with such a switch on the rear panel, and if the high sound range gives an impression of weakness move the de-em- phasis switch to its other posi- tion. ANTENNA CARTRIDGE TAPE PLAYERTURNTABLETURNTABLE (!) For connecting 4-channel discrete FM broadcast adaptor For connecting Dolby NR adaptor For connecting channel adaptor PRE/POWER AMP The bridge/connecting plugs between PRE OUT and POWER I N jacks should always be left in position in normal use. If they are disconnected or removed, no sound will come from the speak- ers. Always be sure to cut the power supply before attempting to re- move them. TAPE DECK (open-reel, cassette)TAPE DECK LINE INPUT LINE OUTPUT LINE INPUT LINE OUTPUT Playback/Recording Cord (DIN-type) FUSE - R CH L CH R CH L CH R CH (C) L (A) (B) SPEAKER SYSTEMS SX-1 01 0 BLOCK DIAGRAM 4 CH MPX OUT (C?) :CED FM ,?, L.-i1CED S19 MUTiNG SWiTCH SIQ or:- r- co :0 2 0 - a:a: iDh: 6- :00 2 0 - CO r- a: CL. CL. r , CO r- a: CL. AUX S0a S11 a or: :r: MIC MIC PHONO 2 (0 Sl1b , 0- AUX SWITCHES S 1 FUNCTION S 2 S 3 S 4 S 5 SlO SI1 S,Z a: - CL. L w.J CL. Sa: 2 0 - L 8-! :r: r- 2 :0 - C gj-! ;)h: icl co a: N CL. L w.J CL. PHONO 1 PHONO 2 MIC AUX DUPUCATE TAPE MONITOR 1 TAPE MONITOR 2 4 CH ADAPTOR DOLBY NR ADAPTOR MODE S i1 LOUDNESS S 14 TONE DEFEAT S15 LOW FILTER S 16 HIGH fILTER S 17 AUDIO MUTING S 18 DIMMER S 19 FM MUTING S 20 SPEAKER A S S22 S 23 POWER l) L Stabilizer to Tuner AF section S18 - :rll J -v- to Power amplifier Stabilizer d:c Regurator S40 -Q-Q- CIRCUIT DESCRIPTION SIGNAL PATH 1. The FM broadcast signal waveform from the antenna is fed to the two dual-gate MOS field-effect transistors in the front end for radio frequency amplification. This signal is converted into an intermediate frequency by the dual-gate MOS FET mixer stage in com- bination with the signal from the local oscil- lator. 2. The intermediate frequency signal, con- verted within the front end, is fed to four ceramic filters and three ICs, where it is tuned, amplified, and detected, becoming a audio frequency (composite) signal. The composite signal following detection is fed to the 4 CH MPX terminal jack and the multiplex decoder stage. 3. The multiplex decoder stage uses one IC for three functions: to demodulate the com- posite signal into the left and right channel stereo signals, to operate the automatic mode switching between stereo/mono, and to switch the stereo indicator lamp appro- priately. The decoding system uses a phase locked loop (PLL) circuit, which assures continuous stable operation and excellent stereo sepa- ration with low susceptibility to external noise (such as car ignition noise) and ambient temperature changes. After decoding, the signal is fed to four transistors and one LC filter, where the residual carrier component (38kHz, 19kHz and SCA) is rejected, and then to the audio amplifier section. 4. The FM muting circuit consists effectively of two circuits, designed to reduce the pulse noise which can so easily arise when a muting circuit is operative. The one circuit is an electronic switch in- corporated into the IC, so that the de- modulated circuit is switched off and on in the IC, and the other short-circuits the audio signal by means of a reed relay. 5. The AM tuner section employs one mono- lithic IC which functions as radio frequency amplifier, frequency converter, local oscil- lator, intermediate frequency amplifier, and detector. The output is a pure audio signal. 6. The signals which are applied to the MIC and PHONO terminal jacks are selected by the FUNCTION switch before being fed to the first stage of the three-stage differential direct-coupled equalizer amplifier by which the signals are amplified. In order to reduce the switch noise, the circuit configuration employed enables the potential at the input and output terminals to be set at near zero volts. SX-1 01 0 It incorporates an independent differential circuit in the first stage of the equalizer amplifier whose DC supply uses twin plus and minus. 7. The output from the equalizer amplifier together with that from the AUX terminal jacks, the audio signal from the AM tuner and the audio signal from the FM tuner, are all selected by the FUNCTION switch, and pass through the switch circuits for TAPE DUPLICATE, TAPE MONITOR, 4 CH ADAPTORDOLBY NR ADAPTOR, and the circuits for BALANCE and VOLUME controls, before being fed to the control amplifier. 8. The control amplifier has an extremely high input impedance, using PNP and NPN tran- sistors in a direct-coupled two-stage circuit. This greatly reduces the influence of the p