Yamaha-R-2000-Service-Manual电路原理图.pdf

STEREORECEIVER SERVI CE MANUAL FRONT PANEL ij: : : :, : :- o F- :-. .J. . . . -. ., -., 0 POWER SWITCH f) RX MODE INDICATOR . TUNING LEVEL INDICATOR e FM STEREO INDICATOR . STATION LOCK INDICATOR 41) SIGNAL QUALITY INDICATOR . AM/FM INDICATOR fI) DIGITAL FREQUENCY READOUT I) AUIO PHONO SWITCH . INPUT SELECTOR BUTTONS . PRESET STATION BUTTONS . VOLUME CONTROL . TUNING LEVEL BUTTONS MEMORY BUTTON . TUNING BUTTON . BAND SELECT BUTTONS . PHONES JACKS . SPEAKERS SELECTOR . SUBSONIC FILTER SWITCH . HIGH FILTER SWITCH . BASS CONTROL . PRESENCE CONTROL . TREBLE CONTROL . SPATIAL EXPANDER CONTROL . PRE-MAIN COUPLER SWITCH . REC OUT SELECTOR . PHONO SELECTOR . BALANCE CONTROL . LOUDNESS CONTROL . MODE SWITCH - FM MUTING SWITCH . RX MODE SWITCH _CONTENTS REAR PANEL. INTERNAL VIEW . DISASSEMBLY PROCEDURES. . . . . . . . . . . . . MEASUREMENT AND ADJUSTMENT. . . . . . . . SPECIFICATION. 8 BLOCK DIAGRAM . 9 WIRING DIAGRAM . SCHEMATIC DIAGRAM. SINCE 188i . V AMAHA I 004433 I NIPPON GAKKI CO. LTO HAMAMAT5U. JAPAN 2000 REAR PANEL U.A. o :.:. - _._.-. i ., . o W IT) 0 0 . (J)(!)(!)(!)(!)(8J. BRITISH ;oo (!) (!)tJ)(IH!)rn ! - .- . -. . 0. -. (j) (!) (!jd) d) , (!) (!) m . . - . . -. . -. (j)d) .(j)(!) d) (!) (!) (!) .AM ANTENNA TERMINAL . PRE OUT/MAIN IN JACKS . POWER CORD . VOLTAGE SELECTOR _INTERNAL VIEW TOP VIEW _DISASSEMBLY PROCEDURES 1. Top Cover Removal Remove the screws CD and CV in photo 1 from both right and left sides, then remove the top cover, Photo 1 K-:UJUU 0 POWER TRANSFORMER GA6465 (U) GA6466 (C) GA6468 (R) GA6467 (G) GA6469 (A. B) f) ELECTROLYTIC CAPACITOR CIRCUIT BOARD (Power supply) . MAIN CIRCUIT BOARD (1 G I AMP CIRCUIT BOARD . AM LOOP ANTENNA . TUNER CIRCUIT BOARD . FRONT END PACK PK101 fI) MAIN CIRCUIT BOARD (3) (Pin Jacks) . CONTROL CIRCUIT BOARD (6) (Phones Jacks) .CONTROL CIRCUIT BOARO (2) .CONTROLCIRCUIT BOARD (4) . CONTROL CIRCUIT BOARD (1) . MAIN CIRCUIT BOARD (4) . MAIN CIRCUIT BOARD (2) . CONTROL CIRCUIT BOARD (3) . CONTROL CIRCUIT BOARD (5) 2. Bottom Cover Removal Remove the screws CD to (jj in photo 2 and then remove the bottom cover. . - It 7 . mn1l1HIIIII0 . . 0111111111 13- . 111111111111111111111111 111111111111111111111111 111111111111111111111111 Photo 2 K-:.I:UUU 3. Front Panel Removal a. Loosen the set screws of SPEAKERS, REC OUT PRESENCE and PHONO knobs with a 1.5 mm hex- agon wrench, then pull out each knob. b. Remove the screws T to :1) in photo 3 and remove the front panel. * Remove the screws :1: to W in photo 2 when the front panel is removed. Photo 3 4. Main C. Board (2) Removal a. Detach the connectors and PHONO, TUNER indica- tor lamps which are attached to the Main C. Board. Refer to Fig. 1. How to connect the wires to the jumper socket. Fig. 1 b. Remove the screws CD and CID in photo 4 and then remove the Main C. Board (2). ; i/3 :_.:;: Y-.-:r :-: j r . r. ;j:f: ;(0 . ;J, :- r) . r. . 1E) !r)( ni! ) - . (- u : , -. . . ;0 ,: -. -. - Photo 4 5. Main C. Board (4) Removal a. Remove the plastic rivets (!) and CID in photo 4 and then remove the Main C, Board (4). b. Detach the lead wires which are attached to the Main C, Board (4). 6. Control C. Board (3) Removal a, Remove the Main C. Board, (Refer to step 4 and 5. b. Remove the plastic rivets (!) to CID in photo 4 and then remove the Control C. Board (3). c. Detach the lead wires which are attached to the Control C. Board (3) . 7. Control C. Board (5) Removal a. Detach the lead wires which are attached to the Control C. Board (5) . b, Remove the nut CID in photo 4 and remove the Control C. Board (5) . 8. Main C. Board (3) Removal a. Remove the connectors and Remoto Rotary Switch, * How to detach and attach the remoto rotary switch. When the knob is rotated fully clockwise. R,mo, 0, ;tth, Switch -=-=1 c: :Lf1- :.:-.:- I C. board Check that the switch can be operated precisely after attaching it. Fig. b. Detach the lead wires which are attached to the Main C. Board (3J . c. Remove the screws CID in photo 3 and CD to (!) in photo 5 and then remove the Main C, Board (3J. , . . , . ,;. -: . : . .:. . Photo 5 9. Tuner C. Board Removal a. Detach the connector, remote rotary switch and lead wires which are attached to the Tuner C. Board, b. Remove the nuts to (jj in photo 4 and screws (jj to in photo 4 and then remove the sub schassis unit toward yourself, c. Remove the screws (j) to CID in photo 3 and the screws CID to (jJ) in photo 5 and then pull out the Tuner C. Board to the front side. 10. Control C. Board (1) Removal a. Remove the Control C. Board (1J. (Refer to step 10, b. Remove the plastic rivet to in photo 4 and then remove the holder unit. c. Remove the Control C. Board from the sub schassis unit. d. Detach the lead wires which are connected to the Control C. Board (1). 11. Control C. Board (3) Removal a. Remove the Control C. Board (1 J and (4) . (Refer to step Q9) and (jJ) , b. Remove the plastic rivet to in photo 4 and remove the Control C. Board (3) . c. Detach the lead wires which are connected to the Control C. Board (3J . 12. I AMP. C. Board Removal a, Detach the lead wires which are connected to the I AMP. C. Board. b. Remove the screws (jj) and (jJ) in photo 3 and then remove the heat sink, c. Remove the screws CD to (j) in photo 6 and then remove the I AMP. C. Board. (L and R channel are common. 13. Main C. Board Removal a. Detach the lead wires, connectors and remote rotary switch which are connected to each C. Boards. b. Remove the sub schassis unit toward yourself to according to step 9 (b). c. Remove the heat sink according to step 12 (b). d. Remove the screws (jj to (jj) in photo 3 and the screws (jj) and (jJ) in photo 5 and then remove the Main C. Board gently. 14. Electrolytic Capacitor C. Board Removal a, Remove the screws ifi) to in photo 3 and then remove the Electrolytic Capacitor C, Board. b. Detach the lead wires which are connected to the Electrolytic Capacitor C. Board. 15. Power Transformer Removal a, Detach the lead wires of the Power Transformer. b. Remove the bottom cover according to step 2. c. Remove the screws CD to 1) in photo 7 and then remove the Power Transformer. Photo 7 16. Phones Jack (Control C. Board (6) ) Removal a. Remove the screws and in photo 4 and then remove the power switch. b. Pull out the phone jack stopper and to the war directed by allows in photo 4 and then remove the Control C. Board (6), c. Detach the lead wires which are connected to the Control C, Board (6). 2000 _MEASUREMENT AND ADJUSTMENT 1. FM TUNER ADJUSTMENT Before adjusting connect the auxial iary center meter (JiOO036 or similar one) between Sand NVCC. . Set the switches to the following positions. Bandselect.,. FM RXMODE .AUTO TUNING LEVEL . HIGH MUTING . During adjustments, use a low-pass filter. Start adjustment, after waiting 5 minutes following power switch-on. ADJUSTING POINTS Tuner C, Board (1) . Do not forget to keep the bottom cover on. Abbreviation of Instruments FM S.G. FM Signal generator DM Digital multimeter OSC. Oscilloscope DIST.M. : Distortion meter C. Frequency counter ST SG : Stereo Signal generator VRIOI FM Stereo Distortion Adjustment AM Sensitivity Adjustment (Low Frequency Range) FM Stereo Distortion Adjustment I F Frequency Adjustment FM FRONT END FRONT END 1FT 6g69P PLL Input Phase Adjustment VRJO8 !1: UJ (j .J UJ - (J) (J) CO 4559 AM Sensitivity I Adjustment (High Frequency Range) rclo9 . LA2300 Fig. 0605 -f+- III IC6O3 rM Frequency TC401lP Display Adjustment :i: g VR6 . ; VR602 CD 0 c: AM Frequency g8 Display c: . g -g R606 . Adjustment ; J603 uo oo.E IC601 LC7258 VR500 g;2o LJ VR603 Control C, Board (1) Fig. Step AdjustmentTerminals to beInstrumentAdjustmentAdjustment Reting or Reinllrits itemconnected required locationmethodstanderd External VR sett-, Vref, EConnect VR between Tune manual- ing(control c. board)Vref and E. Iy with this Connect the centerVR when ad- tap of VR to MT. lusting. (Refer to Fig. 5) Manual setShort wireShort MA (TP) and ESet MA to L for a moment. (Referlevel once. to Fig. 5) S curve adjustmentFM antennaOSCT102At detuned point terminal (300n(discriminator MUTELOCAL balanced ANT)FM SG/ST coil) 5 - 5. , E terminalDIST. M OFF0 - 5. Tuning point sett-FM antennaFM SG 98MHzExternal VRAdjust VR so that the voltage be-Check that JF ingterminalAntenna input:70dB/ltween Sand E is 4.5 - 5.MODE switch becomes Local. Monaural distor-FM antennaFM SG 98MHzVC101Reduce distortion toLess thanCheck that JF tion adjustmentterminalAntenna input:70dB/l(trimmer)mir:imum.60dBMODE Switch outputMonaural:1 kHz 100%70dB)becomes Local. modulation OSC DIST. VCOFM antennaFM SG 98MHz non-VR105 :;jet to 1 kHZ III!hen 19kHzCheck that JF adjustmentterminal outputmodulation forcing the set Into the :t 20HzMODE Switch stereo mode. 19kM, MEF .C. 1 Mn resistor (Refer to Fia. 6) (:t 10Hz)becomes Local. PLL input phaseSame as step 6 FM SG 98MHz T107Adjust so that LandCheck that JF adjustmentAntenna input:70dB/lR output are atMODE Switch Stereo LR:1 kHzmaximum.becomes Local. 100% modulation DM Stereo distortionSame as step 6FM SG 84MHzT101Reduce distortion toLess thanCheck that JF adjustmentAntenna input:70dB/lVR101minimum60dBMODE Switch Stereo LR:1 kHzVR10270dB)becomes Local. 100% modulationFront end 1FT OSC DIS. M SeparationSame as step 6Same as step 8VR103 (L R)Adjust so that separa-More thanCheck that JF adjustmentVR104(RL)tion is at maximum.40dBMODE Switch (58dB)becomes Local. Pilot cancelingSame as step b Same as step 8T108Observe wave formsLess thanCheck that JF adjustmentPilot:9% modulationVR106on oscilloscope and50dBMODE Switch adjust so that leak(-BOdB)becomes Local. level is reduced to minimum. Signal meter fullSame as step 6Same as step 8VR108Adjust so that LED ofCheck that scale adjustmentStereo LR:1 kHzsignal meter is at fullLED is not 100% modulationscale.out at de- tuned point. S curve offsetsame as step 3 Adjust over again from check step 3 when S curve off- set is not found to be with- in specified value. Check that IF MODE Switch becomes AUTO, Step Adjustment item Frequency display adjustment (I F offset) erminals to be connected Same as step 4 Adjustment Rating or method stlnderd Tune so that the voltage between Sand E becomes 4.5V - 5V. Four figure display; The best point is found when the number of tenth figu re changes. Five figure display; Connect 22kn between FA and E. The best point is found when the on and off of the display of 1 Oak figure is stopped. North European, British models. (Refer to Fig. 5) Set to the highest frequency with ex- external VR. Adjust VR604 so that display frequency becomes 108. 35M Hz. Next, memorize in CH1 and read. Adjust with VR603 so that dis- play becomes 87.35MHz. Remarks Instrument required FM SG 98MHz Antenna input: 70dB/l Stereo (frequency accuracy:within :t 5kHz) Adjustment location 602 Band edge check Same as step 4 (receiving frequen- cy range check) Same as step 13 . Connect J603 to control C. board and detach after adjustment except North European and British models. FM SG 98MHz Antenna input:70dB/l VR603 VR604 Press UP and DOWN switch. Receive 87.5MHz and 108MHz station. Check that Tuning LEVEL switch is not stopped at HIGH when the set is auto tuned. Auto reception check Same as step 4 Tuning level check I Same as step 4FM SG 98MHz Antenna input:20dB/l 16 . Specified values are ones that are able to be measured with YHP4333A (except step , 7 and 14). Step shows the circuit for easy adjustment that holds an optional frequency. Step means the rest operation to operate manually. External VR setting Manual setting Short MA (TP) and E for a moment ., C6O3 Td401lP FA f7)J t VR601 .!.b V.602 R606 IC601 LCl2 External VR 10kn Note; North European and British models. Connect 22kn between FA and Eat FM reseption. III II I . IC604 LCna7 VR604 :;:. VR603 22kCl Control C, Board (1) Fig. 5 VCO Adjustment TIO7 VRIO3 VRIO4 b=d + ICIO3 LA3380 IMCl 19 19kHz TP (Connect +12 with 19KM by means of a 1Mn resistor, to force it into the stereo mode,) (The counter earth line should be grounded at a location as close as possible to the test point,) Frequency counter DODD 0000 ICIO4D lel TIO8 19kHz:t20Hz (Reference value :t10Hz) Fig. 6Tuner C. Board (1)VRIO6 2000 2. AM TUNER ADJUSTMENT This is to be carried out after adjustment of the FM tuner section has been completed. . As a rule, the local oscillator coil is not to be turned. . Connect the AM loop antenna to the AM ANT termi- nals. AM LOOP ANTENNA AM SG . Set BAND SELECTOR to AM. Abbreviation of instruments AM S.G. . . . AM signal generator 3. Audio section adjustment After the power switch is ON. Wait 5 minutes before measuring to be sure of the most stable operation. . Connect dummy load (Sn) to the speaker terminals. a. DC offset voltage adjustment . Test point: TP 1 - Earth (L and R channels) . Adjustment volume: VR406 (Main amp. P. Adjustments Ovserve Land R channels on the digital multimeter at the same time and adjust VR, Set to the point that DC offsets of Both channels are at minimum. Less than O:t 100mV . When adjusting VR406, DC offsets of both channels changes, so set to the point that the balance of Land R channels is best. b. Idling current adjsutment . Test point: TP1 - TP2 (I amp. P.B. Land channels) . Adjustment volume: VR701 (I amp. P.B. Land R channels) . Adjustment Adjustment VR701 and then set the voltage between TP1 and TP2 to 6 :t 3mV on digital multimeter. Control C, Board (1) 22kn IC603 TC401lP FAre Frequency display Adjustment . .-. IC601 LC7258 Digital multimeter (!) IJIJIJDIJIJ D 7 IOkCl Connect 22kn between FA and VDD (21 pin of IC601) at AM reseption. Digital multimeter RY402D 8:1:1:1:1:- 50Cl 50Cl OPEN Fig. 7 Fig. .TP1TP2(LRCH) Idling Current 6 :!:3mV Fig. 9 (!) IJ IJ IJ OIJ IJ Adjustment methOd Perform Steps 1 - .I Adi:nment External VR sett. ing MANUAL setting S.curve center check IF frequency ad- justment Terminals to be connected I Instrument Adjustment tIIquired . . IliCation OSG Connect dummy AM SG 450.00kHz antenna to ANT 1 OOdB/-L 120dB/-L terminal output Lor R Same as step 3 E terminal Lowest receiving frequency adjust- ment Highest receiving frequencyadjust- ment Same as step 3 Low frequency range sensitivity adjustment High frequency -1 . range sensitivity adjustment Tuning range sensitivity dif- ference Signal meter full scale adjustment Same as step 3 600kHz 40 SOdB/-L Same as step 3 1450kH 40 SOdB/-L Same as step 3 Repeat from step 4 to 7 Same as step 3 950kHz 80dB/-L Frequency display I Same as step 3 adjustment 950.00kHz Auto reception check Same as step 3 950.00kHz . Use the dummy antenna shown in Fig. 4. (Do connect the loop antenna. SW406 4.2V :E 1V .TP1E(LRCH) DC offset less than 0 :!: 100mV T110 Adjust so t