Kenwood KA-7090R, Service Manual

Page 1: ...b K29 3759 14 Slide switch s62 0034 05 Screw terminal board E70 0063 05 Power cord bushing J42 0083 05 Phono jack E63 009e 05 AC outlet Eo3 AC power cord E30 Phono jack E63 01 02 05 d rl STEREO INTEGRATED AMPLIFIER KENWOOD KA 7090R SERVICE MANUAL KENWOOD aror t o ao H üA lJ FOW l i ll l ö _ __ I l r ir SoJFCE0BFCI ICUJ a3S FECCTi Ir J Jl F Jl _ri Refer to parts list on page 26 ...

Page 2: ...KA 7090R CONTENTS ACCESSORIES Accessories Batteriee 2 6ffit Battery cover A09 01 70 08 ...

Page 3: ...s 3 Remove panel top screws panel bottom screws and fram screw 4 Remove bottom screws rear screws O and bottom plate 5 Lift unit to arrow direction Power transformer is bottom side 6 Replace power transistors G xt3 DISASSEMBLY FOR REPAIR xz KA 7090R xs Oxq q ur l f 4 Oxs 7 xz t tt rcl gxt sN J g ...

Page 4: ...t the powER key to oFF to destroy the backup data while pressing the oN STAND BY key 4 BACK UP DATA WHEN STAND BY coMPo KA 7090R K s AUDIO INPUT TAPE MD CD AUX TUNER PHONO REC OUT TAPETMD MD TAPE CD AUX TUNER PHONO SOURCE DIRECT CD DIRECT DIRECT LOUDNESS SOURCE DIRECT rl o a a MD MONITOR X J REMOCON SYSTEM CONTROT o 8 16 i r fl61 MOTOR VOLUME HEADPHONE a_ qPEAKEE BACK UP ÄletA B oFF A lBl A B OFF ...

Page 5: ...oes off and the audio muting is turned off MD MONITOR key for only KAF 7002150A2 When this key is pressed the MUTE display LED lights and the audio muting is turned on When this key is pressed again the audio muting is turned off and the dis play LED goes off ATT 30d8 key for only KA 7090R When this key is pressed the ATT LED lights and the ATT 30d8 is turned on during normal operation The REC mut...

Page 6: ...DIRECT LED lights The SPEAK ER LED does not light All other LEDs light The REC OUT selector is operated by inputting the code of the selector after a REC MODE ON code is input for only KA 7090R The main unit s keys can be pressed even in the serial test mode However the operation is not guaranteed in this case The operation when the code having a function not con tained in the corresponding model ...

Page 7: ...CRIPTION DESTINATION x2 L AD COMPO K s DISCRIMINATION KAF 7OOA5OO2 DISCRI M I NATION K s q KA 7090R LED DISPLAY x 13 SELECTOR LED RELAY CONTROL xG REC OUT LED x 1 A T T LED x 1 ON STANDBY LED x 1 LOUDNESS LED x 1 S DIRECT LED x 1 SP RELAY x 2 LED DISPLAY x 14 SELECTOR LED x 6 MD MONITOR LED x 1 MUTE LED x 1 ON STANDBY LED x 1 LOUDNESS LED x 1 DIRECT LED x2 SP RELAY x 2 POWER ON x 1 N 5 N 1 6ö gD T...

Page 8: ... LUOr ECC il lllll tL l Y eE rrrLLl A ztax 3 44de o aa cc aäccccqP J l Lrl u l J i 4 ar5 z 96 L Yt gffi FÖ ad IU o tLF uZ Yl g gyi z är rt LlJ Ä zl x 394 Q öll Y q o ccccEy J Ul Ul Ul L i 4 arb ß z 9 JÖN or e ü lFz zz r 4 ul o ffitttttttttt il llllllil ltil llittl EE TLU nä J CI s tro o e s o d co c cä o o o F U a eb 5e l f z uJ f a M 3 7 47 n M 4 I0 5 s P Tffi ...

Page 9: ...3 Y l6bit serial test code C2XXH KA 7090R CIRCUIT DESCRIPTION lTFIil Receivins code L L ...

Page 10: ... v il lllll rttttttttttt il lil lltil lllttl lrll l F XE Xo af tL üo I fr259Q g 9 j z o rrrLil l ztax a4de o a q oäccccccY fuJulului 4 ar5 2 V e sfi 4 6R I JJ o z o lr LlJ l ztax f X 5ioc0 Y s ii5q oUcEEccg rxululL 4 arb tr LUr JnN F E I lJ z z taFOcc F Ao J t 1 LU O o q E F o E g o I o lcc t to lö IO o c E c E o E I c c Lcr l0 Itil I c Itr tl lo la _0 E B to o i g o sb g0 lx rlo l lo N l z uJ F a...

Page 11: ...SEL V REF A D I INPUT sELEcroR sw INPUT OON IHoL ltF rvrrr A P D REFEBENCE VOLTAGE OSCILLATOR 8MHz OSCILLATOR 8MHz GND 5V 19 20 21 XIN X OUT VSS LI 1t I l3 vcc N C NOT USEIJ H ENABLE MICROPROCESSOR CHIP ENABLE RESET SIGNAL INPUT TERMINAL PROTECTION DETECTION REMOTE coNIlgL NP rtRMIlt _ 24 c4 to Utr RESET FnorrcrtoN I I 27 IrygTY SOURCE DIR B eni Datr nlFl a I 28 29 I I COMPO NOI UstU r äornnv ENco...

Page 12: ...ecified the individual switches should be set as following POWER ON SPEAKER B REC OUT OFF 17 6 mV vR1 3 L vR2 4 R xoe A 3 Connect a DC voltmeter between cN 5 L cN 6 R x0e A 3 CONNECTOF PIN NO cN5 CN6 L ch IDLE R ch IDLE 1 2 4121 123 Q122 124 3 4 Q125 127 Q126 128 11 ...

Page 13: ... More than 10pF 10 50 Less than 4 7LrF 10 75 Less than l0PFl Code B c D F u pF 10 1 10 25 r0 5 l l Voltage ra p o o lst word A B c D E F u H J K 0 1 0 1 25 1 6 2 0 1q 4 0 5 0 6 3 8 0 1 10 12 5 tb 20 13 21 e 40 50 63 80 2 100 125 160 200 250 a1F 400 500 630 800 1 000 1 250 1 600 2000 2500 31 50 4000 5000 6300 8000 Dimension code L T Empty 5 6 0 5 5 0t05 Less than 2 0 A 4 5 t 0 5 3 2 0 4 Less than 2...

Page 14: ... a l Utl U l Dl i J fi1 C11 R2 l 5 or itVo fr ti R 9 v Rtr 1 d 4 Ä r i J70 0895 Ol ca3 cä1 ir to ya3r_ TtiGi n4 q3r F5a EJg c35 R50 UX n 5 J36 F59 R 8 LJ R62 TAPf REc R c3a R6l Rr r r ff tJ J R O l 7 I I h t rsl iqr 1 r r i 8 q lt l3 cfJl r _r qi i1 ffiJ I I I Fl s l I P I r i r l tlE t rl r o t REC ouT 5 P LAY IN REC OUT 7 PL AY IN I c l ls lnl i F i öä H ö I ch Rch RFLA l lu2a tr gJr iril _ rfd ...

Page 15: ...rl l l isi W iti rft tt 1ldA lsl öö ü lül EE r V Qlf t l ü0 lrllrlH i r f ztzb I P l p I q l I l o t ö o qnrA ts o lrl lrlOl r x o a o ü a sss Flü I i lfflQ riffffi rl E F ig f Ej o N F u o c DKÄ lrlc o o rt O o rrÄ itsf Y PFDI j I t l sö r ü i iä u l 18 96i hJ ru 1 Dif l I l ltt 10ä ril03 if3r sÄs l0ullto 3 li n l o ö i N s a l 9 r3 78o t ES lf 08au E ...

Page 16: ...PC BOARD COMPONENT SIDE VIEW AC OUT LET 115V 230V ü ü I lti ä 2 t4 1 o Z m o Z i l i I lr I ill LJ ill rl F r il üüü T o itHt elal 5P 5ELr r st r cl 1 Dl SPEA KERS ffi i ffii q rii PHONES fl POWER 16 ...

Page 17: ...J7 z _ E n a i4 SQ l Dloa F1 l f r q i l 6 R1c Df0r Rt22 II l l z F g J 0102 Dr 03 z t 01 06 fr DF _ Di05 A o INPÜT SfL _tr r I i r r t i I _ ffa 1 l Y C r i qt v l 6ff1 l r t 1 l i i l l t I T Hl äl l i ui i i ri E B r t d o qrsz d r t5 r 3 5 1 i rlr jrL5 E t1B 1 I at3i a rrl D lb t t l l il r r 4 t tttl r t J Itl l x Dr ü8 l F J 5OURC n illFr I Refer to the sche a I ac ar for the value of resist...

Page 18: ...i r tt H l I d l 1 I I rucr I l tidvr l fs r u I r _l I zucr I l l I I t t t r r u Eq r ll 8 l Errrtul I I eqrr l t l I I rqcr I l ll oozl F r loNoill ftr fl l n z o Jl rl nrs z l Atüll I l r i fO r rl I I J rp E_ I tlo v I tt00 6t00 099 8tJ 9t3 ZZE EN oL zLrn 6ox I ...

Page 19: ...E E E Aozz t rzr AVB I 10 1 I 1 8 3 t rJr AVR I l Y F AVRI fiozs 455v nrr A nros 6KJ 2702W Ao3o iejl A 11Ä Vz v 1 l4W FX rr iE_l corurnor I 16 7V 2 xoe c 3 r OL 29d ...

Page 20: ...54 8V oi1t2 oe3 e4 E4l o85 88 il c139 0 01 081 84 F dscooel R269 s4 47K tDC oFF I oerecr Aoer X ors frX öd s r sf qlzv HX r ...

Page 21: ...äiltl lon ven I 16 8V 175V FF o3 t E Ac j_ L1 87 22uH 10 ItMTs tl lri lC o zrv I t L hi 1 t FHoNo l I Llncnz I Eoo tl tH I t E L J Rch2 I I rl fL m l F ül tr tl F h6l fL fR he I l L h1 l F M l r FUNEBI L r L r r RECI Ir I tr ÄPA I I lr LL L r tB öl l I I I lr L FLAII L l tl tR M l J4 tl h1 I l 4 MD 0V ...

Page 22: ...rtt E ro G l Isawi3 tz I lzE 3 es öt tr l9 t tQtE ctt L_ _Pi 0tl LLX EFM at Ar L l oNöN l lts I i irÄan I I a t 1 ZNC e F 60x tzr rl J o r 01 zB9e r LX NNL tnVo o lls oz zege l rx ZHM cn c 00e ezia c 0e0 6il8 ONOHd t 3t V oeeterU O tC zct f oT I __ r 4 ilE 6 4 l l r i iill SV r r ...

Page 23: ...1 52 T 53 DT27 130 D134 R2r0 30K F208 t5K cl c2 tc3 NJM4565D D M3747TM4 8055P S 8O6D Z 2SA954 L K 2SC2003 L K UN42l2 or DTC124ES 2SC2458 Y GR or 2SC33l 1 A O R 2SA1 048 Y GR or 2SAl 309A O R 2SC3940A F S or 2SD863 E F 830 2461 05 1SS133 or HSS 04 RD7 5JS B or HZST 55 B 1SS131 or HSST04A 556888 or 1SRl39 100 RD5 1JS 82 or HZSs 1S 82 Ä r l fr rg q2 rumt l i 56 ffi 051 x 1 3682 70 t 10 KA 7OqAR EJ QI...

Page 24: ...ic shock leakage current or resistance measurements shall be carried out exposed parts are acceptably insulated from the supply circuit before the appliance is returned to the customer The DC voltage is an actual reading measured with a high impedance type voltmeter with no signal input The measurement value may vary depending on the measuring instruments used or on the product 25B1370 2SD2061 TCg...

Page 25: ... porlddns lou ore OO ueql roorel sroqunu popoldxa aq qln supd H06 L Vy rrrun nnrn otooldxl ...

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Page 27: ...6 O O O s OO OOs6O O O O OOOOO s OO OvOvO OO O s 6on o öoo oot6o ooöoo oooov g ÖSv oÖo oStos o oSo öoöo ooÖoÖ oÄdS OOUOO ÜOOÜO OÜUOÜ ÜÜUJOO OOUOO OOOUO OOOOO UöLUOO OÜOUO OOUOU UöYOY OOOOO OOOOO OOOOO OOOOO OOOOO OOOOO OOOOO OOOOO OOOOO OOOOO OOOOO zd z E N ON ON O O N N N O ooo s ooo r rr o o roFor OQOFO orOro O oo orOS oooo oo o rr ooooo OOOOO OOOOO OOOOO OOOOO OOOOO N ONS ts Y _ N N T _ OON Orr...

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Page 29: ...nama KENWOOD ELECTRONICS U K LIMITED KENWOOD House Dwight Road Watford Herts WDl 8E8 United Kingdom KENWOOD ELECTRONICS BENELUX N V l 4eachelsesteenweg 418 81930 Zaventem Belgium KENWOOD ELECTRONICS DEUTSCHLAND GMBH Rembn lckerStr 15 ffi150 Heusenstamm Germany KENWOOD ELECTRONICS FRANCE S A 13 Boule ad Ney 75018 Paris Fmnce KENWOOD ELECTRONICS ITALIA S p A Via G Sirtori 7 9 20129 Llihno italy KENW...