()NKYO® SERVICE MANUAL
Contents
1. 2 QUARTZ LOCKED CIRCUIT From Detector 1102 C112 Output 10 7MHz Trap To Multiplex Circuit R E gt To Oscillator 1 Circuit 9224 Os Quartz Ampli T 19 kHz Switch Fig 9 The quartz locked circuit compares the frequency difference between the 10 7MHz reference signal and the IF signal the difference being used to subsequently drive the AFC circuit A 10 7MHz component is extracted from the quadrature detector output by the L102 trap amplified by the Q104 IC and applied to pin 5 of the 0251 IC An accurate 10 7MHz reference signal is generated by the quartz oscil lator and applied to pin no 1 of the same IC A 19kHz square wave is obtained from pin no 10 of the PLL IC and applied to pin no 3 of Q251 The IF signal and the quartz oscillator reference signal are switched back and forth in a 19kHz cycle and passed on to the detector and amplification stages When S1 and 52 and both connected to the IF signal line the IF frequency is detected resulting is the generation of a voltage whose level corresponds to the IF frequency This voltage is then applied to one of the differential amplifier inputs When S1 and S2 are then both switched across to the quartz oscillator signal line the quartz oscillator reference signal is detected converted into the corresponding voltage and applied to the other inpu2. 5 r 73 0014 80879 14 90074 01814 Ten aa 200 100 99 1001 T HN A 189251 10 eet 8197352 ED 0S 1d VN 6 8 Wi ty 955352 20 17006 1 777 T 8547456 10 ure D 0 0 FO ae E W USL BTs DAW00S9 XL 2ILVW3H2S zoe 108 7 50914 212 144 7L7 ld VN 2 i DSL7 WIVN
3. OL 725 P WA toiX voix I 5 loy LOO 9 ATU A yet i n 09A X6 Site DGL7 WLYN ANDES EE ONG MES MIC ERES P ECL D UP cub C ULRICH ee INO 9 JOW 100 5 15 II3W00S9 X L PON 2IIVW3H9S 3 WV EQUALIZER AMPLI PC BOARD NAEQ 496 PARTS LIST CIRCUIT NO PARTS NO DESCRIPTION ICs Q301 Q401 222471 HA 1457 Capacitors C301 C401 392880227 2 2 50V LL C304 C404 352734701 47uF 10V Elect C311 C312 352780101 1 50V Elect Switch S801 25030101 NRS 374 30A Source selector SWITCH PC BOARD NASW 497 PARTS LIST CIRCUIT NO PARTS NO DESCRIPTION Switches 5805 5807 25035079 NPS 222 162144 Dubbing Tape 1 Tape 2 S808 S810 25035078 NPS 322 143 EPS Muting De empha SWITCH PC BOARD NASW 499 PARTS LIST CIRCUIT NO PARTS NO DESCRIPTION Capacitors C360 C460 372328214 820pF 5 50V ST C364 C464 352984796 0 47uF SOV NP Switch S811 S813 25035078 NPS 322 L43 Hi filter low filter Subsonic filter INDICATOR LAMP PC BOARD NAPL 503 PARTS LIST CIRCUIT NO PARTS NO DESCRIPTION Lamps PL806 PL812 210042 PL12V0 03A AM FM PH 1 PH 2 STEREO TUNED LOCKED DIAL ILLUMINATION LAMP PC BOARD NAPL 474 PARTS LIST CIRCUIT NO PARTS NO P801 210039A DESCRIPTION 300mA 8V Dial illumination lamp FRONT END PC BOARD FAT S2EJ 41 PARTS LIST CIRCUIT NO PARTS N
4. Diodes 223105 224069 224079 9 223853 223802 Capacitors 352724711 352752201 352741011 352782211 352751011 352752211 352751011 352751021 352753311 352744701 352741011 Resistors 441621214 441622714 Fuse 252014 Fuseholder 250113 Relay 250166 25065037 Radiators 27160011 Ot DESCRIPTION 2SC1815 GR 25 945 P 2SC1815 GR 25 945 p OF 28A970 GR 25 733 P 25 1815 GR 25 945 P 28C2120 O 28C2120 Y 2SC1815 GR 25 945 P 28C2240 BL 25 2240 GR 254816 284816 F 25 1626 25 1626 Y 250235 2SD235 Y 2SC1815 Y 25 1815 Q c e A a4 m 181555 05422 0 2220 151 151885 Zener 4TOUF 6 3V Elect 22uF 25V Elect 100uF 16V Elect 220uF 50V Elect 100uF 25V Elect 220uF 25V Elect 100uF 25V Elect 1 000uF 25 Elect 330uF 25 Elect 47 16V Elect 100uF 16 Elect 1209 IW MOF 2702 IW 4A T Lamp 5 5051 NRS 2P5A DC12 or NRL 2P5 A DC1 2 02 RAD 05 NOLL V OAMNO NO Z 330 1 H3M0d 1065 NO Z 440 1 HOLIMS HOSS320Hd TVNH31X3 8085 HOIH E 2 MO1 l HOSN3S WNH ILAS NO Z 340 1 315411555 WNOIS QIJYNSVIW 30 1704 90 2145 NO Z 3307 2 YOLINOW 329119085 NI 38V h SHOLIOVdYO 211 7
5. 8 no 10 30 a uw 201 i d s oop 1 7 Ala 7819 0 S Ato 10229 tt 1357 D M v la 582 diid addy avez asgng ayeaisqag aana 1011250 PIOIOI OJA 1021 201 10 02080 300230 2914113 5504 4 5 dwol 4014 7010100 u05 25044 10090 pr 3 mom 01 210 1 038315 B ws wpns ie Nan Um 22000 H T TAC IN One ri itu 6525 SSZ 9009 3138 3 1 ZL 15255 652 0 172 21000 SEID 11 7 gt iN 700 06 27 arora 92 t 005 2NN 8 203 aosi gt 00 601 8567 199 oH LELO 5 0715 E m tok d 45 WEE Qeon 051 zua 91 01 eni S 62 8010 6010 4 00 Tum 2012 1700 26 013 NO LOW 3 P 505 E 0 335
6. And since Q121 will turn off when Q119 turns the AFC circuit will also begin to operate When the tuning knob is touched a certain amount of hum is induced This hum is amplified by Q115 rectified full wave by D115 and D116 into a DC signal and applied to 0118 is consequently turned on resutling in the AFC circuit being switched off If however the hum level is rather low the LOCKED lamp might not turn on even when the tuning knob is touched If this happens reset the rear panel sensor switch to either the Normal or High positions ALIGNMENT PROCEDURES INSTRUMENTS REQUIRED GENERAL ALIGNMENT CONDITIONS 1 DC Voltmeter 1 Signal input should be kept as low as possible 2 AM Sweep Generator 2 Standard modulation is 400Hz 30 AM 100 3 AM FM Signal Generator FM pilot 9 sub and main 917 FM STEREO 4 AC 3 Standard knob position 5 Oscilloscope SPEAKERS 6 Monitorscope BASS TREBLE amp BALANCE Center 7 Distortion Analyzer OFF 8 Stereo Modulator MODE STEREO 9 Frequency Counter NORMAL LOUDNESS OFF MUTING LOCK OFF 1 2 OFF SOURCE 1 IDLING CURRENT ADJUSTMENT Connect the DV Voltmeter between ID and CT terminals Adjust the voltage to 40 10mV with R23 NOTES
7. ampli 0701 Fig 8 Positive voltage detector The protection circuit is operated 1 when the B circuit is unstable when the power is turned ON approximately 5 seconds 2 when the speaker terminals are shorted and abnormal current has flowed in the power amplifier thru this low impedance 3 when the center voltage has increased because of trouble at the differential amplifier etc When Q703 is turned on by voltage detection or current detection Q704 is turned ON by the voltage drop across R708 Q704 Q705 constitute a digitalized fast response Schmitt trigger circuit When 0704 is tumed ON 0705 is turned OFF 0705 is a relay drive transistor When it is turned OFF the relay is also turned OFF When the power switch is turned ON charging current flows thru the loop R709 gt C702 gt R707 gt R708 and 0704 is turned ON by the voltage drop across R708 Consequently Q705 and the relay are turned OFF until the charging current drops below a certain value When the power switch is turned OFF the B voltage falls and C702 is quickly dis charged thru the loop R709 gt C702 gt D701 During normal operation C702 is charged to almost the B voltage But since the saturation resistance of Q703 is sufficiently low when Q703 is turned ON C702 is quickly discharged thru the loop R709 C702 gt 0703 and the realy is also turned OFF The relay is not rurned ON again thereafter until C702 is charged ever if the set should return to
8. AD z al d YS762SZ 90500 02 59 A 45010 8291252 L0 700 E ur 6 0 V LGBW 70 00 0 8 1852 80 00 E 12 9250 201902 200 14291252 200 m i 55619150100 200 01916522250 100 0 awos 7572 Tay UO 9 105 0 Ago 038 My 000 Gc 2060 amp LS71 YH 2109 C2 928 1071060 1 seats cosa 4 2 4 19 15378 z ms mam T 14 ms wero zr T ota U 15 ASZ IOO 095 1065 8 8 8 1085 5 8 5 u 5 005 100 9062 005 190 005 100 qi LL E 05 4170 6068 scm 3 Mom ig od i ots TES ae US 6 1810 9 0922252 040 101201010212952 SOLO i 987 93vN 50044 50914 1 95 IdJEELVSZ 20 YOIOLEVSZ EOLO VSIOAS 709 5084 2063 47576252 20150 5181952 904 704 2 foem VEDAR 208 10914 6 6 e 9 eo e O pmi comme 1S4 YS 74 TNn 71907 15 250 Wey 1 LNO 427 3 E aa Ino wv P 5 7 7 i 2 4901 UNS L gra P 5g 8 lt QJ 0 4 ag In
9. Set signal 455kHz Lower end 515kHz Repeat steps 1 and 2 5 necessary Repeat steps 3 and 4 as necessary 6 FM FRONT END ALIGNMENT 1 Set SELECTOR switch to FM 2 Connect FM Signal Generator to 300 ohm antenna terminals 3009 Output EO Jac ________ oscitioscope Signal Generator Distortion Analyzer FM Signal Generator Output Indicator Indicator Adjust for No signal Quiet 0 Bottom Tuning Center Point Indicator 98MHz oe Distortion 90MHz 65dBf 6088 I kHz 75kHz devi 20MHz Tuning Repeat Steps 3 106MHz 65dBf 60dB nm Indicator Cin and 4 as necessary IkHz 75kHz devi met 90MHz 20dBf 15dB 1 7 75kHz devi 20 2 VTVM illoscope 20dBf TCI Osci p 106 2 I5dB TC3 Maximum I kHz 75kHz devi 5 98MHz 65dBf 60dB Distortion 7 MULTIPLEX ALIGNMENT Stereo Modulator Repeat Steps and 2 as necessary G3 Repeat Steps 5 and 6 as necessary EXT mod Connet AC VTVM across SPEAKER terminals 8 ohm 100kohm Frequency Counter Step FM Signal Generator Stereo Modulator Output Indicator Adjust for 98MHz Frequency R125 19000 19H ps TENER AL ms Ems eem STEREO INDICATOR should light up when stereo program is being received Pilot Sig 9 ind Mod Main amp Sub Sig 98MHz R142 Min
10. Speaker 5813 7 i A B Leh UC S815 SPEAKER 5 A LAB B Rch 11 m NASW 0331 0332 0333 03235 1336 0327 i 499 Rade R336 Preampli 5 Preamol Preampli Rags MI d ru y eese SEOL u 5802 TRE 2 2 5 5811 2 2582 ui 2 ee j E 2 LP n 2 S813 PRE OUT 5803 m l 2431 0432 i 1423 0435 046 037 5 Preampli Preampli T7 Prinmpli MIO E x E R ch RAIL 2 cats 2 1 806 5802 1 8n d2 215812 1 2 3 PHONO 1 4 2 1 2 ON IH STEREO 2 I OFF 2 ON 1 1 gt 2 2 2 gt TAPE 1 1 OFF 2 ON 1 OFF 2 ON 1 2 Le ff NAAF 500 S809 MUTING LOCK 5810 DE EMPH S811 HIGH FILTER 5812 LOW FILTER 5813 SUBSONIC S815 SPEAKERS S816 HUM SENSOR 5901 POWER L Fig 7 1 ON 2 OFF 1 754SEC 50uSEC 2 25uSEC J OFF 2 ON 1 2 ON 1 2 OFF 1 OFF 2 A 3 B 4 5 A B 6 2 NORMAL 3 HIGH 1 2 ON TX 6500MK CIRCUIT DESCRIPTION 1 PROTECTION CIRCUIT Q703 Q707 Protection Q704 Q705 Q706 Current Circuit Schmitt Hold Detector Switch Trigger Circuit From collect of power ampli voltage To Speaker detector 5 Ampli RL701 Terminal Speaker relay From power
11. knob 33009 2W Metal oxide film resistor LJ 100 H Stereo headphone jack TX 6500MKII PACKING PROCEDURES U S A Model Universal Model 5 6 1003 MM p 12 a 53 m 6 11 _______ Ne aa Or O EN l s y 7 7 9 10 u 12 9 10 ofo 8 6 d 13 e E d pd 250 e d E B Fig 5 Four shorted pins are inserted in the phono terminals 2 All printed materials and accessory items are placed in the poly bag and taped 3 The sensor tag is attached to the tuning knob PARTS LIST PARTS LIST U S A Model Europe Model REF REF NO PARTS DESCRIPTION NO PARTS NO DESCRIPTION 1 29340271 Instruction manual 1 29340272 Instruction manual 2 29358001 Service station list 3 252020 SA T Fuse 3 29355046 Caution card for 4 5 29380034 Sticker U 4 29365003 Warranty card 6 292064 5059 01 FM antenna 5 252053 8A ST 6 Fuse 7 29100006 250 x 350mm Poly bag 6 292064 5059 01 FM antenna 8 29355045 Sensor tag 7 29100006 250 x 350mm Poly bag 9 29095085 670 x 1 200mm Protection sheet 8 29355045 Sensor tag 10 29100020 720 x 1 020mm Poly bag 9 29095085 670 x 1 200mm Protection sheet 13 292075 10 29100020 720 x 1 020mm Poly bag 14 29050201 11 282969 Caution card 15 29090288 Pad R 12 29360209 Cabinet composite label 16 29090287 Pad L 13 293041 Caution label 1
12. normal and Q703 is turned OFF Hold Circuit The reference voltage is produced by R715 R716 Q706 is operated as a comparator When Q705 has been turned OFF the collector voltage of Q705 rises and C702 is charged Therefore when C702 is charged to above a certain voltage relative to the reference voltage at the junction of R715 and R716 Q706 is turned ON Q703 is turned ON thru R717 and the circuit is held Current Detector Q707 is turned ON by the voltage detected from the collecor circuit of the power amplifier C704 prevents erroneous operation When the impedance is low at a certain frequency of the speaker the protection circuit may be unexpectedly actuated each time a large audio signal of that frequency has entered However when this occurs the relay is opened and the power amplifier current returns to normal The power amplifier current is also automatically returned to normal in a like manner when the load has been inadvertently shorted momentarily When connected with the load shorted the relay is repeatedly turned ON and OFF in load short relay OFF no load automatic reset load short current detection relay OFF order Since the OFF time is sufficiently longer than the relay ON time in this case the voltage across C703 gradually increases until a voltage sufficient to turn Q706 is reached at which time the relay is held OFF thus protecting the poeer transistor against damage by a continuous overcurrent xX 6500
13. 0419313 330 2 NO L 21 05915 16105 1 34 1 2 4 1 2 2 3dVl e 3dV1 l 1 870 5095 0310N 36 10 SS3INN AMOS 41 NI 0112 4 2 Tvs 2 330 1 831113 0112185 NO Z 330 ONILNW OTONY 7085 5801 2352 2 23510612361754 1 30 0185 2 330 1 5533010112085 6310N 330 2 NO L 34201 ONTLAW 608S Z 771 ONOHd 3 2 WV L 8012313511085 189852 38 155052 5578 567052 22 T 9291252 81852 US Po Bonviva 896vSZ 8622252 TI SETO EEO NI 543 o 283 70 tot LET LEEDO 109001 6578 i 20 960 0 026752 EEL EEEO 8168752 gt NI 100 WIVE9NSZ 9 7 SEE 767 TEE E7 CEED s 9 d3xv2dS _ 844 18 46 49 07ZZ9SZ ZE7 2660 wo 100 0186 752 7 TECO j CY 0 13 2978 sie i 676252 1291252 Wu 8 DN du 958 046 52 0722252 d H33V3dS A m 4 O O as T wore 59 6 82328 ino 23 NI eaey 86 752 E 19 D 6522262 y 19 6196961 v d3oiV3ds 1 906 SUC 692 92 08 992 TW SSSLSL 90 10 0 uo Y P JR nzzzso e06 z060 O oe were a 10122181 9985 2110 vov Ru amp 5 EREN 20 0 89652 019 yepe 2 50 0 8622252 600
14. 47 233026 232066 233105 233024 9 3504109 25030077 25065016 25045044 25045025 250256 25060008 25060021 25060029 25055015 25045018 25050032 253099 270025 252053 250080 243086 243087 250249 27100030 27140211 27200020 273803 273903 28140104 27100031 27160040 27150084 27130132A 27115034 27146212 27140233 27185002 27110061 27205012 27185001 27300114 27190033 27240016 27140203 27215030 27215031 27220009 27120122 27225028 13719574 223852 25035015 3504012 251070 250130 352743301 27130131 U S A Model PARTS NO DESCRIPTION 240037 FAT 52EJ 41 FM front end 13699575A NAIM 475a AM FM tuner p c b 13709576 NAXL 476 Quartz locked circuit p c b 13699596 NAEQ 496 Equalizer ampli p c b 13699597 NASW 497 Switch p c b 13699598 NASW 498 Switch p c b 13699599 NASW 499 Switch p c b 13699500 500 Preampli p c b 13699501 501 Power ampli p c b 13699503 NAPL 503 Indicator lamp p c b 13719574 NAPL 474 Dial illumination lamp p c b 2SD551 R Power ampli 25 551 0 91 transistor 2SB681 R Power ampli 2SB681 O 91 transistor PL8VO 15AW 2 Meter illumi nation lamp PL8V0 05AW 3 Pointer lamp NPT 642D Power transformer NBLN 1 Balun transformer NMA 3012 Antenna coil bar antenna NOCH 09 or Choke coil 24 000 63V Elect capacitor NRS 266 30Y W Speaker selector switch NSS 2327 Sensor switch NPJ 4P
15. 5012 27185001 27300114 27190033 27240016 27140203 27215030 27215031 27220009 27120123 27225028 13719574 223852 25035051 3500052 251070 250130 352743301 27130131 lamp p c b 280551 oi Power ampli 2SD551 0O transistor 2SB681 R Power ampli 258681 91 transistor PL8VO 15AW 2 Meter illumi nation lamp PL8V0 05AW 3 Pointer lamp NPT 642G Power transformer NBLN 1 Balun transformer NMA 3012 Antenna coil bar antenna 005 or Choke coil 24 OOOLF 63V Elect capacitor NRS 266 30Y W Speaker selector switch NSS 2327 Sensor switch NPJ 4PRBL21 Phono input terminal NPJ 4PRBLO3 Tape input output terminal EPS input output terminal Pre output main input terminal NTM 1WPBL E1 4ch detector output terminal Ground terminal NTM 3PUM1 Antenna terminal NTM 4PRMNOS Speaker terminal Connection bar LJ 100 H Stereo headphone jack 5 16444 01 outlet terminal AS VDE 1 Power supply cord Stopper for 32 5 AC fuse S N1301 Fuse holder NIND 0500886 Signal strength meter NIND 0250587 Center tuning meter M 1614 Power ampli transistor socket Front chassis PC bracket Dial drum SP 14A Dial drum spring Stringing Cushion Back chassis Radiator Shielded case Bracket for radiator Side bracket Transistor case Bracket for dial pulley DP 16N Dial pulley Front bracket Drive shaft DP 26N Dial pulley Cushion Lamp holder Illumination brac
16. 54818 Y 9 mentary 25 2238 O Comple 25 2238 mentary 254968 _ Comple 254968 Y 9 mentary 250551 R _ Power 250551 ampli 25 681 _ Power 2SB681 or ampli 151555 05Z6 2 L WZ061 M8513A or Zener S 1 3B IOUF 25V LL 330uF 16V Elect 47uF 16V Elect 68 000uF t1095 100V DE IOUF 63V Elect 1OUF 63 Elect 50V Elect 15kQ 2W MOF D22A Themistor N1OHR470BE SF 100 1W Metal 820 MOF 100 Metal 2 79 1W Metal 0 4792 SW Cement 0 3392 SW Cement 102 2W Metal 5 60 1W Metal 2 2 35 SF D22A Themistor RAD 05 3P 8F N N 3F N beta group hr as the original type Capacitors LL DE Resistors MOF SF Metal oxide film resistor Semi fixed variable resistor 24 RECTIFIER AND PROTECTION CIRCUIT PC BOARD NAPS 502 PARTS LIST Q701 Q702 Q703 Q704 Q705 Q706 Q707 Q901 Q902 Q903 Q904 D701 D704 D902 D903 904 0906 C701 C702 C703 C909 C910 C911 C912 C913 C914 C918 C919 C920 C921 C922 R713 R904 R907 F902 F9Q2a RL701 Low leakage current type electrolytic capacitor Non inductive polyester film capacitor Transistors 2211255 2210746 2211255 2210746 9 2211395 2211803 9 2211255 2210746 9 2211163 2211164 9 2211255 2210746 9 2211405 2211406 9 2200673 2200674 9 2200663 2200664 2200013 2200014 9 2211254 CIRCUIT NO PARTS NO 2211255 31
17. 7 13704139 Accessory bag complete 14 29050201 Carton box 250153 PO 107 Shorted pin 15 29090288 Pad 29365005 Warranty 16 29090287 Pad L U Only Europe model 17 13699119 Accessory bag complete G Only German model 250153 PO 107 Shorted pin X 6500MKII BLOCK DIAGRAM 750 STRENGTH o AE PHONO 1 ot o Y Lch i y Equalize 2 mp 1 3 i R ch G PHONO 2 2 Sx 2 1 ASW 197 _ 198 SWITCH S801 SELECTOR S802 LOUDNESS S803 MODE S 804 AUDIO MUTING S805 DUBBING 5806 MONITOR 2 5807 MONITOR 1 5808 PROCESSOR SWITCH X101 9101 x102 IF Filter FM IF Amp IF Filter 0102 Detector outi 0115 Sensor Tuning gt gt Guadrature L302 C112 IF Trap Quartz Lacked Circurt QL ch Out QRch Qut X De Emph QAFC Dut 0120 0119 Locked Tuned Lamp Lamp Switch Switch uz 1 1 3 LOCKED 9 TUNED TUNING Fig 6 CT ation 0505 0506 Constant Current 260 2 2606 Bias atior 0505 0605 Compler entary a608 OB 490 LOH ppie iter 3902 7 L pple Filter 19030904 voltage Detector 1 251 RELG Current leve Power Ampli 0613052 ______________ _
18. Adjust after switching on for 5 minutes Open load VOLUME Minimum TAPE 1 ON 11 X 6500MKI 2 CURRENT DETECTOR CIRCUIT CHECK TAPE 1 CR Differentiation SPEAKER Terminals Oscillatc Circuit 2 ohm or 3 ohm ud JUL Load Resistor 50Hz 3Vp p O 1 K 3 3K Apply a tone burst signal to the 1 terminals Connect a 20 hollow resistor to the speaker terminals and adjust vari able resistor R48 so that the relay is operated at maximum volume Connect a 392 hollow resistor to the speaker termi nals Confirm the relay is not operated at maximum volume NOTES Adjust after switching on for 5 minutes VOLUME Maximum Fig 12 Differentiation Circuit 3 CENTER VOLTAGE CHECK When the transistor of the differential amp of the power amplifier or the constant current circuit has been replaced check the center voltage Connect DC VTVM between the CT E terminals and check if the reading of the DC VTVM is within 50mV Perform this check 5 minutes after the power switch has been set to ON 4 AM IF ALIGNMENT 1 Set SELECTOR switch to AM 2 Set radio dial to quiet point AM Sweep IP Oscilloscope Generator Maximum Symmetrical Usually not necessary X103 to adjust 5 AM RF ALIGNMENT Loop Antenna Antenna Sp SetSignal SetRadio Dial VTVMreaing Remarks F jeo Upper end _12
19. O DESCRIPTION Transistors Q1 3SK45 B Q2 25 535 B OSC Block 222013 F 15EA NOTE Capacitor Polystyren film capacitor NP Non polar electrolytic capacitor 22 X 6500MKH POWER AMPLI PC BOARD NADA 501 PARTS LIST CIRCUIT NO PARTS NO 001 002 003 004 005 006 007 008 009 010 011 012 Q13 014 D01 DOS 102 D03 D04 LOI C01 C03 C12 C17 C22 C26 C29 R14 R20 R23 R26 R27 R28 R29 R30 R33 R34 R35 R38 R39 R40 R43 R45 R46 R48 R51 CAUTION NOTES Transistors 2211372 2211414 2210772 22107749 2210782 2210784 9 2210746 2210782 2210784 9 2210772 2210774 9 2200863 2200864 9 2200873 2200874 9 2200802 2200803 9 2200812 2200813 9 Diodes 223105 224042 223928 0 4000031 Coil 231001 Capacitors 392851007 352743311 352744701 374136835 352771001 352771001 352780101 Resistors 441721534 4000003 221019 451631004 441628204 451631004 451630274 4000035 4000034 451731004 451630564 5221007 4000003 Radiators 27160011 Pan head screws 82113008 Nuts 863130 Replacement for power complementary and driver transistors if necessary must be made from the same DESCRIPTION 28C2259G 0 002 Diffrential ampli 28C1627 Y Regulator current 254818 254818 Y or Driver 25 1628 Regulator 25 1628 Y current 25 945 P Bias stabilization 25 1628 Comple 25 1628 Y mentary 28 818 Comple 2
20. ONKYO SERVICE MANUAL QUARTZ LOCKED STEREO RECEIVER Model TX 6500MKII TABLE OF CONTENTS Specifications Precautions Service procedures Component location Exploded view Packing procedures Block diagram Circuit description Alignment procedures Stringing diagram AM FM tuner schematic diagram AM FM tuner p c b view Preampli p c b view Equalizer ampli p c b view FM front end p c b view Power ampli p c b view Rectifier and protection circuit p c b view Schematic diagram ONKYO AUDIO COMPONENTS SERIAL NO 3949 TX 6500MKII SPECIFICATIONS Amplifier section Power Output Total Harmonic Distortion IM Distortion Damping Factor Frequency Response Tilt Sensitivity and Impedance Phono Overload Tone Controls Signal to Noise Ratio RIAA Curve Deviation Filters Loudness 26dB Audio Muting 100 watts per channel min RMS at 8 ohms both channels driven from 20Hz to 20kHz with no more than 0 05 total harmonic distortion 0 05 at rated power 0 04 at 1 watt 8 ohms 0 1 at rated power 0 08 at 1 watt 8 ohms 50 8 ohms 1 kHz 3 30 000Hz 1dB through TAPE 1 80 000Hz IdB at power amplifier better than 5 at 50 7 through TAPE PHONO 2 5mV 50 kohms TAPE PLAY 150mV 50 ohms REC 150 3 5 kohms PHONO EPS OUT 150mV 3 5 kohms PHONO EPS IN 1 50mV 50 kohms PRE 1 2 2 kohm
21. RBL21 Phono input terminal NPJ 4PRBLO3 Tape input output terminal EPS input output terminal Pre output main input terminal NTM 1WPBL Et 4ch detector output terminal Ground terminal NTM 3PUM1 Antenna terminal NTM 4PRMNDOS Speaker terminal Connection bar LJ 100 H Stereo headphone jack 5 16444 01 AC outlet terminal AS UC 3 Power supply cord SR 3P 4 Strainrelief 8A ST 6 AC fuse S N1301 Fuse holder NIND 0500S86 Signal strength meter NIND 0250S87 Center tuning meter M 1614 Power ampli transistor socket Front chassis PC bracket Dial drum SP 14A Dial drum spring Stringing Cushion Back chassis Radiator Shielded case Bracket for radiator Side bracket Transistor case Bracket for dial pulley DP 16N Dial pulley Front bracket Drive shaft DP 26N Dial pulley Cushion Lamp holder illumination bracket Spring plate Frame R Frame L Pointer slider Back panel Shielded case NAPS 502 Protection and rectifier p c b 55188 Silicon diode NP5 111L A3 Power switch UL125V103M UL capacitor LG 2C Terminal T 4461 Ground terminal 334F 16V Elect capacitor Bracket for power supply p c b N 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 71 72 73 74 75 76 77 78 CIRCUIT NO Ut U2 U3 U4 US U6 U7
22. U8 U9 U10 U12 013 014 TX 6500MKH Europe Model PARTS NO DESCRIPTION 240037 FAT 52EJ 41 FM front end 13699575 NAIM 475a AM FM tuner p c b 13709576 NAXL 476 Quartz locked circuit p c b 13699596 NAEQ 496 Equalizer ampli p c b 13702597 NASW 497a Switch p c b 13699598 5 498 Switch p c b 13699599 NASW 499 Switch p c b 13699500 500 Preampli p c b 13699501 501 Power ampli p c b 13699503 NAPL 503 Indicator lamp p c b 13719574 NAPL 474 Dial illumination 0511 0512 2200802 611 Q612 2200803 F 0513 0514 2200812 0613 Q614 22008139 PL803 PL804 210041 PL805 T901 001 001 1002 903 904 5815 5816 P801 P802 P803 P804 P805 P806 P813 P809 P810 P812 P814 P815 P901 P903 W901 W901a F901 F901a 801 M802 511 001 A003 A005 A006 007 A018 A031 A032 A033 A034 A054 A036 A055 A056 A061 A062 A064 A066 A067 A071 085 A084 A083 A087 105 107 U11 D901 5901 C901 C902 P817 C165 A002 210044 230248 233026 232066 233105 233024 OF 3504109 25030077 25065016 25045044 23045025 250256A 25060008 25060021B 25060029 25055015 25045018 25050032 253088 25065018 252020 250080 243086 243087 250249 27100030 27140211 27200020 273803 273903 28140104 27100031 27160040 27150084 27130132 27115034 27140212 27140233 27185002 27110061 2720
23. anel 3 6500 COMPONENT LOCATION 3 x 12 31 13 28 63 16 19 29 2 2 2 B8 5 17 23 13 27 94 1 j db ld 7 Hy 7 i if m 54 H 59 En 5 e 78 5 OO __ i m 4114243 A A 715 lO ____ 5 Bi 5 E wb nu 5 57 9 6 da Fig 2 va BN N innr nrannf _ n ZC 1 N o 4 9 e 9 9 Fig 3 COMPONENT LOCATION PARTS LIST REF NO 2 3 19 20 21 22 23 24 CIRCUIT NO Ul U2 U3 U4 Us 77 U8 09 010 012 013 714 0511 Q512 2200802 Q611 0612 2200803 9T Q513 0514 2200812 0613 0614 2200813 9 PL803 PL804 210041 PL86S T901 TOO 1 001 002 903 904 5815 5816 P801 P802 P803 P804 P805 P806 P813 P809 P810 P812 P814 P815 P901 P903 W901 W901a F90 F901a M801 M802 511 001 003 005 006 007 018 031 032 033 034 054 036 055 056 061 062 064 066 A067 A071 A085 A084 A083 A087 105 107 U11 0901 5901 901 P817 C165 002 210044 2302
24. ckwise G2 Wind the dial cord 1 turns around the dial drum 4 Thread the dial cord to the dial pulley 3 Dial Putley 2 Dial Fig 14 Pulley 1 14 NOLLVHOdHOO 94 Uxz 5 UIs tade V0 SJ2AU ON 30129190 MAING ann E al WV3IDVIG X00714 199 NO MS 17 3201 109 316 WS 39v110 20 ON 30v110 20 ED WALA 39v110A AM ST NI 397 p 60112 4 2 2311410912373 Q310N 36 10 SS3INN 58011 2 4 11 0310 3SIMY3HLO SS3 Nn S31ION 01096262 2520 199 8 0 qub 610 AISI81252 9 M L ELOSZ 69 1 5110 50294 558 eua 20778 ee LM 18 EELOSZ 20 ZIZIQA 6110 ea 2 22 725520 1210 071076010 8010 pe 2210 12 0 tolg 576052 100576252 7520 7010 1015 9 7110 50077002010 15 5 9010 ESZO 4 2161252 501077010 ssg g 2920 1820 0210 M9SLIV H7 777 010 ZIO 8000 L01Q ZOLO 9010 010 1010 dO9OLV 1010 t Q IALO CAOZ NO 1n 2370 2
25. des Specifications and features are subject to change without notice PRECAUTIONS 1 For continued protection against fire hazard replace only with same type and same rating fuse PARTS NO AC fuse 8A ST 6 252053 120V model 5 A T 252020 220V model Lamp fuse 4A T 252014 2 Replacement for power complementary and driver transistors if necessary must be made from the same beta hr group as the original type 3 Always disconnect the chassis from power line when soldering Turning the power switch OFF is not enough Power line leakage passing through the heating element may destroy the transistors 6500 SERVICE PROCEDURES 1 CHECKING POWER AMPLI PC BOARD 1 Remove four screws holding top cover and side bracket 2 Remove four screws holding back chassis and radiator 3 Remove four screws holding power ampli pc board and radiator 2 CHECKING TUNER PC BOARD 1 Remove the top cover 2 Remove the bottom baord 3 Remove four screws holding front chassis and protection pc board bracket 3 REMOVEMENT OF THE FRONT PANEL 1 Remove the top cover 2 Remove five screws holding front panel and front bracket 3 Loosen a enamel screw on the tuning shaft and pull out the tuning knob 4 Pull out the control knobs SPEAKERS BASS MID TREBLE BALANCE VOLUME SELECTOR 4 REMOVEMENT OF THE DIAL GLASS 1 Remove four screws holding dial glass and front panel NOTES The dial glass has been mounted by applyi
26. imum Repeat Steps 60dB IKHz Leh 91 oe 3 amp 4 as necessary Pilot Sig 9 Same Same as above Main amp Sub Sig 98MHz R142 VIVM Minimum se ti eft ch paration 1 KHz Rch 91 13 8 1 2 3 4 9 TUNING METER CENTER ADJUSTMENT 1 amp QUARTZ LOCKED CIRCUIT ALIGNMENT Connect the signal generator to the ANTENNA terminals and the DC voltmeter to the detector output pin nos 10 Set the SG output to 98MHz IkHz 75kHz div 65dBf 60dB Tune the receiver to 98MHz Adjust the voltage to 3 5V with a detector coil of T251 Connect the signal generator to the ANTENNA terminals and the DC voltmeter to the detector output pin nos 10 Set the SG output to 98MHz 1kHz 75kHz div 65dBf GOdB Tune the receiver to 98MHz Place a short circuit across TP6 pin nos 10 and 11 Adjust the semi fixed resistor R261 to bring the tuning meter needle to dead center Then adjust the semi fixed resistor R268 to bring the TP7 pin no 14 output voltage AFC output to zero OE AFC OUT Adjustment point Fig 13 10 SYNCHRONIZING THE LOCKED FREQUENCY WITH THE IF FREQUENCY Adjust the semi fixed resistor R264 to bring the TP7 output voltage to zero STRINGING DIAGRAM Close the variable capacitor complete and tie the dial cord to the spring of the drum 2 Thread the dial cord in the direction of arrow from 1 to 3 and wind the dial cord three turns around the tuning shaft clo
27. ket Spring plate Frame R Frame L Pointer slider Back panel shielded case NAPS 502 Protection and rectifier p c b 55188 Silicon diode NPS 121L16P Power switch PME 271Y SIOCEE IS capacitor LG 2C Terminal T 4461 Ground terminal 33U4F 16V Elect capacitor Bracket for power supply p c b 6500 EXPLODED VIEW EXPLODED VIEW PARTS LIST U S A Model REF NO PARTS NO 1 28110141 2 838440109 3 87644012 4 27170044 5 280889 6 831130162 7 831130082 8 13699121 1 8 27210099 9 28125051 10 28125050 11 27267027 12 27267026 13 28191027 14 27270014 15 27300038 16 870051 17 870052 18 86213010 19 28133009 20 28198512 21 243086 22 243087 23 834130062 24 28130067 25 27215031 26 27215030 27 27140203 28 831130082 29 13719574 30 27240016 31 834130062 32 13719131 33 834130062 34 28320241 35 28320238 36 28320237 37 28320239 38 28320235 39 441723314 40 25045018 DESCRIPTION Top cover 4TTBt 10C BC Screw W4x12F BC Washer Bottom board Leg 3STW 16BQ Screw 3STW 8BQ Screw Front panel ass y 8 12 Front panel End cap L End cap R Power switch guide Push switch guide Dial glass Spacer Screw Washer Washer Nut Back plate Facet NIND 0500S86 Strength meter NIND 0250587 Center tuning meter 3STS 6BQ Screw Dial plate Lamp case L Lamp case R Spring Plate 3STW 8BQ Screw Dial illumination p c b Il
28. lumination bracket 35 5 6 Screw Pointer ass y 3STS 6BQ Screw Tuning knob Volume control knob Tone control knob Push switch knob Power switch knob 3300 2W Metal oxide film resistor LJ 100 H Stereo headphone jack Europe Model REF NO PARTS NO 1 28110142 2 838240109 3 87624012 4 27170044 5 280889 6 831130162 7 831130082 8 13699121 1 8 27210099 9 28125051 10 28125050A 11 27267027 12 27267026 13 28191027 14 27270014 15 27300038 16 870051 17 870052 18 86213010 19 28133009 20 28198512 21 243086 22 243087 23 834130062 24 28130067 25 27215031A 26 27215030A 27 27140203 28 831130082 29 13719574 30 27240016A 31 834130062 32 13719131 33 834130062 34 28320241 35 28320238 36 28320237 37 28320239 38 28320235 39 441723314 40 25045018 DESCRIPTION Top cover 4TTB 10C Ni Screw WAx12F Ni Washer Bottom board Leg 3STW 16BQ Screw 3STW 8BQ Screw Front panel ass y 8 12 Front panel End cap L End cap R Power switch guide Push switch guide Dial glass Spacer Screw Washer Washer Nut Back plate Facet NIND 0500586 Strength meter NIND 0250S887 Center tuning meter 3STS 6BQ Screw Dial plate Lamp case L Lamp case R Spring Plate 3STW 8BQ Screw Dial illumination p c b Illumination bracket 3STS 6BOQ Screw Pointer ass y 3STS 6BQ Screw Tuning knob Volume control knob Tone control knob Push switch knob Power switch
29. ng an 800 gr torque to the screws If the dial glass is removed during repairs and a torque driver is available apply 800 gr torque to the screws when replacing If how ever a torque driver is not available simply tighten the screws by hand When replacing the dial glass insert all relevant component parts in accordance with the cross sectional diagram 5 REPLACING METER 1 Remove the top cover and front panel 2 Remove the two screws secring the illumination bracket and front bracket 3 Remove the pointer from the front bracket 4 Remove the 2 sets of screws secring the left and right lamp covers and dial plate covers to the front bracket 5 Move the front panel out keeping the dial plate cover held against the dial plate and remove the 2 left and right lamp pc boards Then remove the dial plate from the drive shaft 6 Remove the 3 screws secring the front cover to the back plate 7 The top sides of the meter covers are fastened to the back plate by adhesive tape Remove this tape taking care not to jar or knock the meters Fig 1 6 SENSOR SWITCH For matching the automatic FM tuning quartz lock system to the various operating conditions Set to LOW initially and switch to NORMAL or HIGH if the TUNED lamp does not turn off as soon as the tuning knob is touched 7 CHECKING INPUT OUTPUT TERMINAL 1 Remove the top cover and right channel power ampli pc board 2 Remove three screws shielded case and back p
30. s MAIN IN 1V 50 kohms 200mV RMS at 1kHz 0 05 THD TREBLE 10dB at 10kHz MID 5dB at 1kHz BASS 12dB at 100Hz PHONO 65dB IHF C 87dB A 10mV input TAPE PLAY 90dB IHF C 95dB IHF 0 24 30Hz to 15kHz HIGH 6kHz 12dB oct LOW 100Hz 1 2dB oct SUBSONIC 6dB oct t5 5dB at 40Hz 5dB at 20kHz 20dB Tuner section Tuning Range Usable Sensitivity 50dB Quieting Sensitivity Intermediate Frequency Capture Ratio Image Rejecion Ratio IF Rejection Ratio Spurious Rejection Signal to Noise Ratio ACA AM Suppression Ratio Harmonic Distortion Frequency Response Stereo Separation Muting Level Stereo Threshold Quartz Lock Level Subb Carrier Suppression General Power Supply Dimensions Weight Semiconductors FM 88 108MHz AM 530 1605kHz FM mono 9 8dBf 1 7uV FM stereo 17 2dBf 4uV AM 25 14 7dBf 3uV FM stereo 36dBf 35uV FM 10 7MHz AM 455kHz FM 1 3dB FM 85dB AM 60dB FM 100dB AM 55dB 1 2 95dB FM mono 70dB FM stereo 65dB AM 45dB FM 70dB FM 55dB FM mono 0 15 FM stereo 0 3 0 7 30 15 000Hz 1 5dB FM 40dB at 1kHz 35dB at 100 10 000Hz 17 2dBf 4u V 17 2dBf 17 2d Bf 4uV FM FM FM FM 60dB 220 volts 50Hz or AC120volts 60Hz 538W x 187H x 435D mm 21 3 16 x 7 3 8 x 17 1 8 22kg 48 4 105 7 FETs 9 ICs 66 Transistors 42 Dio
31. t of the differential amplifier The difference between the IF detector DC component and quartz oscillator detector component is then amplified appearing at pin no 14 of the IC This voltage serves as the AFC circuit control voltage Any slight drift or deviation in the detector transformer will therefore result in the same amount of drift in both lines thereby maintaining a constant difference Precise local oscillator frequency will thus be kept at all times 3 TUNING METER CIRCUIT The tuning meter circuit compares the DC component difference between the quartz oscillator signal and IF signal detector outputs and drives the tuning meter in accordance to this difference The Q253 transistor is designed to short circuit the tuning meter when the input signals are weak 0116 0117 Schmitt 4 MUTING CITCUIT Trigger Mute 0108 2 Switch The muting circuit is activated by IF level gt t 0109 the combined effects of the IF detector Gate Circuit component noise component and zero cross detector output Noise emit detector Q120 The IF level detector circuit is LOCKED Q107 incorporated in the quadrature IC INDICATOR Mono Stereo the output appearing at pin no SWITCH Switch 12 This pin is switched to high detector level when the IF level drops LOCKED below the muting level but is INDICATOR switched back to low level when Fig 10 the IF level exceeds the muting level again The detection of noise above 100kH
32. z in the composite signal will also result in pin no 12 being switched to high level Furthermore the output of the zero cross detector which compares the difference between the IF detector DC component and quartz oscillator detector DC component will be at low level when a station is tuned and at high level when turning away from the station the switching point being several 10 TX 6500MK kHz away from the exact tuning frequency Consequently when all detector circuit outputs are switched to low level the 0116 transistor is cut off and the 0120 transistor turned on followed by the LOCKED lamp turning At the same time 0117 is also turned on and Q107 turned off resulting in the STEREO lamp turning on if the tuned sta tion is broadcasting in stereo 0108 and 0109 are also turned off resulting in the appearance of an FM broadcast output signal at the receiver s output terminals 5 AFCSWITCHING CIRCUIT from 119 Quartz Ci TUNED Locked Indicator Circuit Switch Q121 AFC Switch Tuning Q118 Circuit Knob Sensor Gate Ampli Circuit TUNED lamp To Oscillator block Fig 11 In order to ensure accurate turning the AFC circuit is turned off automatically once the tuning knob is touched and also when the muting circuit is switched off When a station is tuned Q118 will turn off and Q119 turn on since Q116 will already be off and Q117 on resulting in the LOCKED lamp turning on
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