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()NKYC)® SERVICE MANUAL

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1. even including the power supplies This is known as the dual line construction or DLC design Further improvements have been achieved in reduction of dynamic modulation due to the use of copper plate bus lines for both ground and power supply Super low impedance has been obtained by the use of extremely thick connections to the power supply section Together with the heavy duty chemical capacitors low impedance low distortion and low loss components have all contributed to greater stability in the high quality of sound Being a DC amplifier even very small DC variations in the input will be amplified and appear at the output So the suppres sion of noise and drift in the low frequency range is very important indeed Consequently a low noise dual gate FET differ ential input has been employed see Fig 2 monaural System O Speaker System The cause for drift in FETs can be traced to a thermal coefficient for the V GS voltage across gate and source Although there is a position where the operational point is unaffected by temperature changes when the drain current ID is flowing the gm of such a point decreases and no gain is obtained Therefore 2 FETs of matched characteristics are coupled in a differential connection thus cancelling out the drift tendencies Employing FETs in this manner makes it relatively simple to construct DC amplifiers because there is very little input leak current which corresponds to the IB
2. AUDIO COMPONENTO M 505 BLOCK DIAGRAM a z gt gt o O lt Z 0 kK ie Lu 2 O ue gt zu ul oo Lis Eu gt aj oO 2 E aa O a oO y O Li O gt O ry e S W I LO o INPUT SPEAKERS ALIGNMENT 1 IDLING CURRENT ADJUSTMENT Connect the DC voltmeter between lIDand V CT terminals Adjust the voltage to 12mV with R218 Left channel Adjust the voltage to 12mV with R318 Right channel 2 CENTER VOLTAGE ADJUSTMENT Connect the DC voltmeter between V CT and E terminals Adjust the voltage to OmV with R265 Left channel Adjust the voltage to OmV with R365 Right channel NOTES Adjust after switching on for 10 minutes SERVICE POINTS 1 The protection circuit may also be activated by minute DC teaks and very low frequency clicks generated in other equipment such as preamplifier divider tuner tape recorder connected to the M 505 To avoid this employ the follow ing methods a Switch the CUT OFF FREQUENCY selector to 10Hz b Switch on the power supply of all other connected equipment before switching on the M 505 and waiting at least 5 seconds before doing so When switching off again switch off the M 505 first c On the other hand if the click generating equipment is turned on at the same time as the M 505 for example when using the SWITCHED outlet of the preamplifier the transient killer circuit will prevent the passage of click signals This method is in common use but it is
3. current in transistors The transistors Q202 and Q203 and Q302 and Q303 connected to the drains of the FETs constitute current mirror loads for the FETs which together with the emitter follower in the next stage considerably improve the frequency response in the high frequency region These transistors also serve as loads to provide the FET operating voltage so special care is requir ed to avoid shorting them since this could quite easily damage the FETs Q205 and Q206 and Q305 and Q306 are the emitter followers used in impedance switching The 2 stage differential amplifier formed by Q207 and Q208 Q307 Q308 with Q201 Q301 reduces drift and improves CMMR Common Mode Rejection Ratio CMMR refers to the suppression of inputs of the same phase and is expressed in dB That is CMMR 201 og differential input gain same phase input gain The bias compensation circuit consists of Q408 and Q209 Q409 and Q309 in a Darlington connection Detection occurs at 2 points viz the power transistor and driver transistor resulting in better response to bias changes during large changes in output power The resultant distortion is very low indeed The output circuit consists of a well matched pure complementary 3 stage Darlington connection with a parallel push pull in the final stage M 505 RLO 7 from Power Transformer 01 151885 or 1 N4002 a 1 7 or 2SA726 F IG D410 151885 IZ D408 151555 0412 RAIS 151885 w D
4. necessary to check the voltage of the outlet Note When the M 505 is being used as a DC amplifier in combination with other equipment check for the presence of DC input signals from the other equipment in the following manner first turn on the power supply for the M 505 and raise the LEVEL VR up from 0 to about 60 Then turn on the power supply of the other equipment Any considera ble vibration in the woofer cone or PROTECTION operation indicates the presence of a DC input signal Either CUT OFF FREQUENCY position 0 15Hz or 10Hz may be used in this case After ascertaining the absence of any abnor malities turn the LEVEL VR full around in the clockwise direction Refer to the accompanying graph for CUTOFF FREQUENCY characteristic curves 2 When replacing diffrential amplifier or push pull amplifier transistors be sure that transistors of one channel have the same hFE ratings M 505 EXPLODED VIEW Top Cover Output Level Knob 28184020 28320021 pi 3STS 6BQ BC A 834430062 ES 27160023 Nut PSN 3 i A A LS Badge Bottom Board 27170022 1 Bottom Board 2S 28135044 27170022A Ne 3STW 8BQ BC 4 gt lt 35 TW 8BQ BC 831430082 7 AN SY 831430082 CO tes T A X2 Power Switch Knob 2 7175004 Leg 28320169A 1 B 280379 4STP 16BQ 4STP 16BQ 833140162 833140162 PARTS LIST 120V Model 220V Model CIRCUIT PARTS DESCRIPTION CIRCUIT PARTS DESCRIPTI
5. AA soco 78 Loco Az 3 VSLLLOST a C AR 8 1010I527087 oeigvse AA TT o EOE ZOE 7OZ E0Z ZOZO PESAN 700 00 200 1000 goe zoe 80z zozo SY D sh EES s HONVEO O m 2000 20 jm mm EINE 27 90 0 SOEO 30 Ea HEY ALS a Lie E ds O cn i 7 SY3NVIAS y 8 LS8vSz Jve ioa Y j 90 50 90Z SOZO O gt O E 00 2008 po D 018291952 i PES isrorerrosz METIO aires SUPE EST O Ele EIZO dD S7657 S 607 807 B0E 6020 i L0 1020 54 00081 5 Cle SZO pasu et m 4 on Po WET AEG mT E NEL dad SLEO ne 78 ER oto EE DOLO am Y a is TE oe eo Lo E 08 Lgvsz 0 8Z919SZ aaa ae Oig aN 6 812o osesesz showeigysz EZIZO OLE OLO TINNVHO 1437 SY 3HVS SSISITANV YIAIYO TBNNVHD HOIS OGE YOVN Pp 3 ive vs 2003 VE VS 1003 2H0S AOZ DW 2HO9 AOZL DY 1A052307 L00 ASZLOV 100 002 w LE WWWyU3H 30133 104d MOTT Po eee BONVYO HEE cia SSS 91 0001 8079 mt OZI tra Vu OS AED 588151 1170 muy ozz SBRISI Sw ea 14 ADE9 100 BEZA 4337 a SU3NVIAS noca ADO LEZI ae ae JOINVEO 19719 L1dN 0919 LoN 1001 10 AO 9 10D Ezo S O7LIDSZ 40 IJDSTEISZ o gt PEE 07 907 707 207 1070 ZHOL aera OM IZLVSZ 40 gt MZ OL SEOL SOZ y LZ 1M2 MZ MY L2 zU MZ 01 20 AONSNOSYS ASOLNS tos me 9747 AS 9978 0 2 7924 SEZ P LEZO D
6. ICS 8034 Munchen Germering Industriestrasse 18 West Germany Telex 521726 Telefon 089 84 50 41 N707
7. IEZM 4313113Wv Y3A1YO JINNVHI 1331 _O6E WvdOViId DILVWIHIS SOS W 137GOW OYE COUPLING MODE OC 015Hz 10Hz CaO The coupling mode switch is set to 0 15Hz PACKING PROCEDURES PARTS LIST REF NO DESCRIPTION PARTS NO U S A UD Germany UG 1 Instruction manual 29340233 29340233 29340233 29340233 2 Warranty card 29365003 none 29365001 1 none 3 Caution card for 2 29355046 none none none 4 Caution label A 282969 282969 none none 5 Caution label 293041 293041 none none 6 Service station list 27358001 none none none 7 Connection cord 24505014 24505014 24505014 24505014 8 Carton box 29050145 29050145 29050145 29050145 9 Pad 29090181 29090181 29090181 29090181 10 Pad D 29090183 29090183 29090183 29090183 11 500X1 000mm Protection sheet 290008 290008 290008 290008 12 350X250mm Poly bag 29100006 29100006 29100006 29100006 13 850X550mm Poly bag 29100019 29100019 29100019 29100019 14 CV C Conversion plug none none 292005 292005 15 CV BS Conversion plug none none none 292006 International Division No 24 Mori Bldg 23 5 3 chome Nishi Shinbashi Minato ku Tokyo Japan ONKYO CORPORATION Telex 2423551 ONKYO J Phone 03 432 6981 ONKYO U S A CORPORATION M 505 Eastern Office 42 07 20th Avenue Long Island City New York 11105 U S A Telex TWX 7105825459 Phone 212 728 4639 Midwest Office 935 Sivert Drive Wood Dale Illinois 60191 U S A Phone 312 595 2970 ONKYO DEUTSCHLAND GMBH ELECTRON
8. ON NO NO NO NO 12846589 NASW 389 Switch and Level Control PC 12846589 NASW 389 Switch and Level Control Board PC Board 12846590 NADA 390 Main Amp PC Board 12846590 NADA 390 Main Amp PC Board 12846591 NAPC 391 Protection Circuit PC Board 12846591 NAPC 391 Protection Circuit PC Board Q001 Q004 2200423 or 25D425 0 or 2SD425 R Power Q001 Q004 2200423 or 285D425 0 or 2SD425 R Power 2200422 Amp Transistor 2200422 Amp Transistor Q005 Q008 2200433 4 2SB555 0 or 2SB555 R Power Amp Q005 Q008 2200435 gt 2SBS55 0 or 2SB555 R Power Amp 2200432 Transistor 2200432 Transistor Do01 223802 or 151885 or 1N4002 Silicon Diode D001 223802 or 181885 or 1N4002 Silicon Diode 223839 223839 PLOO1 210015A SOmA 6 3V Power Indicator Light PLOO1 210015A SOmA 6 3V Power Indicator Light PLOO3 210015A 50mA 6 3V Protection Circuit PLOO3 210015A SOmA 6 3V Protection Circuit Indicator Light Indicator Light T001 T002 230204 NPT 614D Power Transformer T001 T002 230205 NPT 614G Power Transformer C001 C004 3504091 18 0004F 75V Elect Capacitor C001 C004 3504091 18 000UF 75V Elect Capacitor C005 3504012 0 01uF 125V UL Capacitor C005 3500052 PME271Y510CEE IS Capacitor S001 25035015 NPS 111LA3 Power Switch S001 25035015 NPS 111LA3 Power Switch RLO1 25065030 NRL 2PS5A DC12 01 Speaker RLO1 25065030 NRL 2P5A DC12 01 Speaker Relay Relay POO 270665 GND Terminal POO 270665 GND Terminal P002 25060024 NTM 4PRMNO2 In
9. PROTECTION PLOO3 151933 x 4 R401 100K 0401 D404 C408 1000 16 C406 100 16 R421 1K C407 100 16 C403 Q401 402 404 406 407 1007 o dh 2SC9450 P or 2SC1740 S p g A 1 from Power Transformer fig 3 CURRENT PROTECTION SCHMITT HOLD from DETECTOR TRIGGER CIRCUIT SWITCH collect of Power Amp NEGATIVE SPEAKER VOLTAGE RELAY DETECTOR from Power POSITIVE Amp VOLTAGE DETECTOR 18 4 Protection Circuit 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 Q403 is turned on by voltage detection or current detection Q404 is turned ON by the voltage drop across R407 Q404 0405 constitute a digitalized fast response Schmitt trigger circuit When Q404 is turned ON Q405 is turned OFF Q405 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 C403 R406 R405 R407 and 0404 is turned ON by the voltage drop across R407 Consequently Q405 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 C403 i
10. SERIAL NO 3036 ONKYO SERVICE MANUAL ULTIMATE STEREOPHONIC POWER AMPLIFIER Model M 505 SPECIFICATIONS Power Output 140 watts perchannel min RMS at 4 Power Output ohms both channels driven from 20 Hz Dynamic 600 watts total at 4 ohms 0 05 to 20 kHz with no more than 0 05 THD total harmonic distortion 320 watts total at 8 ohms 0 05 105 watts perchannel min RMS at 8 THD ohms both channels driven from 20 Hz Continuous 165 watts per channel at 4 ohms 1 kHz to 20kHz with no more than 0 05 0 05 THD total harmonic distortion 110 watts per channel at 8 ohms 1 kHz Total harmonic 0 05 at Rated power 0 05 THD Distortion 0 02 at 1 watt output Power Supply Rating AC 120 V 60 Hz or AC 220 V 50 Hz Intermodulation 0 01 at Rated power Controls POWER Distortion CUTOFF FREQUENCY SELECTOR Gain 25 5 dB at 1 kHz DC 0 15 Hz 10 Hz Rear Panel Frequency Response 0 1 5 dB at DC 150 kHz LEVEL ADJUSTER L R Rear Panel Input Sensitivity 1 5 V Outputs SPEAKERS Input Impedance 100 kQ2 Inputs INPUT Terminals Load Impedance 4 16 Q Semiconductors 2 FETs 45 Transistors 31 Diodes Damping Factor 100 8 Q 1 kHz Dim ensions 450 W 17 3 4 x 165 H 6 1 2 Filter 0 15 Hz 10 Hz 6 dB oct x 322 D 12 11 16 Signal to Noise Ratio 110 dB HF A NETWORK Weight 17 kg 37 4 lbs Specifications are subject to change without notice ONKYO
11. means no more AC will be applied to terminals 5 and 6 Under normal conditions D411 and D412 operate as full wave rectifier supplying the protection circuit of the high side power supply via the D409 D410 OR circuit Once the left channel voltage drops D411 of the right channel continues to operate as a half wave rectifier with the protection circuit continuing to operate via this voltage On the other hand since C407 will discharge via R422 with current flowing from B R404 R414 D408 R422 The Q403 base potential will fall Q403 and Q404 will turn ON and Q405 turn OFF The relay is thus switched off disconnecting the speakers And because the Q407 base potential increases Q407 also turns ON thus lighting up the protection indicator lamp The holding capacitor C405 is not charged up by the current flowing through R410 Q406 B C D408 R422 Therefore Q406 will not turn ON so when the left channel power supply is returned again the same stand by mode of operation as when the power supply is initially turned on will be employed Note that the wiring to the transformer protection circuit terminals 5 6 and 10 11 are in the reverse right left order If they are connected incorrectly the 12 4V B voltage decreases and the pilot lamp fails to come on M 505 istortion ic d Total harmon load RESPONSE CHARACTERISTICS Output vs 82 TEE A iki E EEL EE E E AE o ten ae a 100kH
12. put Terminals P002 25060024 NTM 4PRMNO2 Input Terminals F001 F002 252020 SA T AC Fuse F001 F002 252003 3A T AC Fuse 25050016 Fuse Holder for AC Fuse 25050016 Fuse Holder for AC Fuse 25108002 MD2R Lug Plate 25108002 MD2R Lug Plate 253091 AS UC 2 Power Supply Cord 253091 AS UC 2 Power Supply Cord 270280 SR 4K 4 Strainrelief 270280 SR 4K 4 Strainrelief 25050017 M1609 Power Amp Transistor Socket 25050017 M1609 Power Amp Transistor Socket A003 27160023 Radiator A003 27160023 Radiator A010 27267019 Guide for Power Switch Knob A010 27267019 Guide for Power Switch Knob A016 28184020 Amp Cover A016 28184020 Amp Cover A025 28135044 Model Badge A025 28135044 Model Badge A027 28198505 Facet Green A027 28198505 Facet Green A028 28198506 Facet Red A028 28198506 Facet Red A030 27170022A Bottom Board Lower A030 27170022A Bottom Board Lower A031 27175004 Leg A031 27175004 Leg A032 280379 Leg Center A032 280379 Leg Center A033 27170022 1 Bottom Board Upper A033 27170022 1 Bottom Board Upper A036 27320169A 1 Power Switch Knob A036 27320169A 1 Power Switch Knob A037 28320021 Level Control Knob A037 28320021 Level Control Knob M 505 CIRCUIT DESCRIPTION 1 General Circuitry The model M 505 power amplifier is a DC amplifier Very low frequencies 0 15Hz and 10Hz can be cut out by the CUT OFF selector As the block diagram in Fig l indicates the M 505 consists of 2 completely independent monaural amplifiers
13. s quickly discharged thru the loop C403 R406 D405 During normal operation C403 is charged to almost the B voltage But since the satura tion resistance of Q403 is sufficiently low when Q403 is turned ON C403 is quickly discharged thru the loop C403 R406 Q403 and the relay is also turned OFF The relay is not turned ON again thereafter until C403 is charged even if the set should return to normal and Q403 is turned OFF M 505 Hold Circuit The reference voltage is produced by R413 R412 Q406 is operated as a comparator When Q405 has been turned OFF the collector voltage of Q405 rises and C405 is charged Therefore when C405 is charged to above a certain voltage relative to the reference voltage at the junction of R412 and R413 Q406 is turned ON Q403 is turned ON thru R414 and the circuit is held Current Detector Q215 is turned ON by the voltage detected from the collector circuit of the power amplifier C221 prevents erroneous operation When the impedance is low at a certain frequency of the speaker the protection circuit may be unexpectediy 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 repeatedi
14. y 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 C405 gradually increases until a voltage sufficient to turn Q406 is reached at which time the relay is held OFF thus protecting the power transistor against damage by a continuous overcurrent The power transformer The voltage detection circuit is an OR circuit consisting of Q401 Q402 First the Lch and Rch signals are mixed by D401 D402 D403 D404 When this voltage is negative Q402 is turned ON and when this voltage is positive Q401 is turned ON and the relay is turned OFF Since the center voltage is unrelated to ON OFF of the load when an abnormal voltage has been detected the relay remains off and the hold circuit is operated until the voltage returns to normal Once the hold circuit has been actuated it is not reset until the power has been turned back on after the cause of the trouble has been corrected The power transformers in both left and right channels are equipped with thermal switches and as an extra precautionary measure special thermal fuses Any sudden abnormal temperature rise due to overload or failure will result in the power supply being turned off To illustrate the sequence of events it will be assumed that the left channel power transformer in Fig 3 has been sudden ly cut which
15. z i o ha o UU HR a EEE iik eet HEY i Hl EAA PEE an 3388 i ul a tes a Hi i T wiin T AStA i rn HL HS HEA Hh sses 10kHz ATL A it EE TY HHH SEE RS oigo fi EH ae a 1kHz IHIHHHHA HAE HEHEHE HH SEE HH MEER rides eae aseta a4 REEE o Bata ao aaa Es ll E Output level W a 10QHz y itt THU LSAZEE EEE i HRH SISI HHH IZ za FEE INNHHHEEEE EH EE pee jiss EER rt tt44 SESS o Hit a He e iiis HEERES iT HEH iH gt tt ty YUOIWO SIP DiuUOW IeY eo Frequency Response 82 load 1V output level gp asuodsay 1Q Frequency Hz 10Hz M 505 4019310 d IYWY3HL x 39Nv 40 MOTIZA 800 200 9005000 TLE PZO og te 2 Jao 0 A AN OA TM UU Ni 3 NVyg3no01 lanka Gis BdAL ZHOS AOZZ OV HOS 1 a S AMZA NI 34V Bel SHOLISVdYD IL E ite LJ DO AOS ST NI Suv SUOLIDVIVI LS 19 0z123S2 9ZLVSZ MA S SWHD NI 3YV SYOISISIY g LELVSZ YOLSISSY SIGVWWVISNI NON e O3I3193dS SSIMYSHLO SS3NN Z DIE ZM SSSISI SZ70S2 16VSZ 818vsz 0681952 YOLIDVSVI MUI YILSIAOS SAILONGNI NON 03 1ddW WNOIS ON 1Y SISSVHD OL 06 ZM 98815 SS8S2 16102 8291987 OS763S7 TOBWAS 7 WALA HLIM O38NSVIN Suv ALI S39VLIOA 90 L LON seals S i i ZOO7Ni i HE YO INONOJIW3S PA

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