Akai-ACM55-cs-sm 电路图 维修手册.pdf

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1、AKAI STEREO MUSIC SYSTEM AC-M55 SERVICE MANUAL m-n UDi snnozyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA S YS TD C Akai-Creative At Heart. RadioFans.CN 收音机爱 好者资料库 1. SAFETY PRECAUTIONS Before returning a unit to the customer, always make a safety check of the entire unit, including, but not l

2、imited to the foliowing items: a. Be sure that no built-in protective devices are detective and/or have been defeated during servicing. (1) Protective shields are provided to protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for ser

3、vicing convenience. (2) When reinstalling the chassis and/or other assembly in the cabinet, be sure to put back in place all protective devices, including, but not limited to, nonmetallic control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacito

4、r networks. Do not operate this unit or permit it to be operated without all protective devices correctly installed and functioning. b. Be sure that there are no cabinet openings through which an adult or child might be able to insert their fingers and contact a hazardous voltage. Such openings incl

5、ude, but are not limited to, excessively wide cabinet vantilation slots, and an improperly fitted and/or incorrectly secured cabinet back cover. Leakage Current Hot Check - With the unit completely reassembled, plug the AC line cord directly into a 120V AC outles. (Do not use an isolation transforme

6、r during this test.) Use a leakage current tester or a metering system that comglies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the unit .AC switch first in the ON position and then in the OFF position

7、, measure from a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handie bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc), especiaily any exposed metal parts that offer an electrical return path to the chassis. Any curre

8、nt measured must not exceed 0.5 milliamp. Reverse the unit power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER. AC LEAKAGE TEST (REflDIMG SHOULD tiOT

9、 BE ABOUE O 5mA) DEUICE UNDER TEST TEST ALL EXPOSED METftL SURFACES 2-UIRE CORD LEAKAGE CURRENT TESTER EARTH GROUMD. ALSO TEST WITH PLUG REUERSED (USING AC ADAPTER PI UG AS REQUIRED) d. Insulation Resistance Test Cold Check (1) Unplug the power supply cord and connect a jumper wire between the two p

10、rongs of the plug. (2) Turn on the power switch of the unit. (3) Measure the resistance with an ohmmeter between the jumpered AC plug and such exposed metallic cabinet part on the unit, such as screwheads, antenna, control shafts, handie brackets, etc. When the exposed metallic part has a return pat

11、h to the chassis, the metallic part has a return path to the chassis, the reading should be between 1 and 5.2 Megohms. When there is no return path to the chassis, the reading must be infinite. If. it is not within the limits specified. there is the possibility of a shock hazard, and the unit must b

12、e repaired and rechecked before it is returned to the customer. EXPOSED riETAL PfiRT n r OHNNETEP OM 2. PRODUCT SAFETY NOTICE Some electrical and mechanical parts have special safety related characteristics which are often not evident from Visual inspection, nor can the protection they give necessar

13、ily be optained by repiacing them with components rated for higher voltage, wattage, etc. Parts that have special safety charecteristics are identified by ( / l on schematics and parts list. Use of a substitte replacement that does not have the same safety charecteristics as the recommended replacem

14、ent part might create shock, fire, and/or other hazards, Products Safety is under review continuously and new instructions are issued whenever appropriate. 3. SERVICING PRECAUTIONS CAUTION: Before servicing unit covered .by this service manual and its supplements, read and foilow the SAFETY PRECAUTI

15、ONS on this page. NOTE; If unforeseen circumstances create conflict between the foliowing servicing precautions and any of the safety precautions, always follow the safety precautions. Remember; Safety First. General Servicing Precautions a. Always unplug the units AC power cord from the AC power so

16、urce before: (1) removing or reinstalling any component, circuit board, module, or any other unit assembly. (2) disconnecting or reconnecting any unit electrical plug or other electrical connection. (3) connecting a test substitte in parallel with an electrolytic capacitor in the unit. Caution: A wr

17、ong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. b. Do not defeat any plug/socket B + voltage interlocks with which unit covered by this service manual might be equipped. c. Do not apply AC power to this unit and/or any of its ele

18、ctrical assemblies uniess all solicf - state device heat sinks are correctly installed. d. Always connect a test unit ground lead to the unit chassis ground before connecting the test unit ground lead last. RadioFans.CN 收音机爱 好者资料库 CONTENTS PAGE NO SPECIFICATIONS 2 SERVICING ADJUSTMENTS AND ALIGNMENT

19、S 5 EXPLODED VIEW AND MECHANICAL PART LIST 13 CASS. DECK EXPLODED VIEW AND PART LIST 19 GENERAL BLOCK DIAGRAM 21 IC DESCRIPTIONS 22 LC7230 22 STK4142 II 28 U1805 31 LA1186N 32 BA6208 33 BA3812L 34 TA7784P 35 LC7821 37 TA8135P 39 CXA1101 40 CXP1001AQ 43 CXD1130Q 46 CXA1081M 49 CXA1082AQ 54 CXK5816PN.

20、 60 LC7880, 7880M 62 BA4558F, BA4558 64 HEF4013B 65 CIRCUIT DIAGRAMS 66 PCB UYOUTS 70 REPLACEMENT PART LIST 74 IC DECK A shoul d be adj ust ed af t er DECK B adj ust ment Osc . Fr equencg Adj ust ment DECK B 135 i l KHz AC- 512 Cent er Cent er Cent er OFF I L5D1 F REQ TP Adj ust f or m axi m um out

21、put ( Ref er t o Fi g. 4) AF I F sueep gener at or connect ed t o a St a n d a r d r adi at i nq l oop Repeat adj ust m ent as necessar g f or maxi mum sensi t i ui t g Adj ust f or m axi m um out put ( Ref er t o Fi g. 4) LW/MW RF ALIGNMENT Si gnal Sour ce Si gnal Gener at or Al i gnm ent I ndi cat

22、 or F r equency Set t i ng Adj ust ment Remar ks OM si gnal gener at or connect ed t o a St andar d r j di at i ng l oop LW 531 KHz Louest f r eq 153 KHz L104, L105 ( Ref er t o Fi g 3) 1602 KHz DC m et er acr oss UT TP and gr oLj nd DC Met er 1. 2U 0 05U DC I l et er 1 9U i O 05U Hi ghest f r eq 28

23、1 KHz TC104, TC105 ( Ref er t o Fi g 3) DC Met er 8 2U t O 05U DC Met er 6 5U i O 05U Repeat adj ust m ent as necessar y t o obt ai n f r equencg r ange MW 630 KHz UT UN acr oss speaker j ack ( Usi nq 8 ohm resi st i i j e l oad) NU 602 KHz LI O* , LI O* ( Ref er t o Fi g 3) LW 164 KHz UT UN acr oss

24、 speaker j ack ( Usi nq 8 ohm resi st i i j e l oad) LU 164 KHz LI O* , LI O* ( Ref er t o Fi g 3) MU I HOH KHz UT UN acr oss speaker j ack ( Usi nq 8 ohm resi st i i j e l oad) NU 140H KHz TC102, TC103 ( Ref er t o Fi g. 3) LU 273 KHz UT UN acr oss speaker j ack ( Usi nq 8 ohm resi st i i j e l oad

25、) LW 27 KHz TC102, TC103 ( Ref er t o Fi g. 3) Adj ust f or maxi mum out put Repeat adj ust ment s as necessar g t o m i ni m i ze t r acki ng er r or FM IF ALIGNMENT Si gnal Sour ce Si gnal Gener at or Al i gnm ent I ndi cat or Fr equency Set t i ng Adj ust m ent Remar ks FM I F sueep gener at or c

26、onnect ed t o FM ext . ant , m at chi ng net uor k used Sueep cent er ed 10? KHz Osci Uoscope connect t o I F t est poi nt I F/ OP TP and gr ound Tuni ng t o Louest f r eq. Tl Ol , Ti oa ( Ref er t o Fi g. 3) Adj ust f or m axi m um am pl i t ude and pr oper l i near i t y bet ueen t l OOKHz Mar ker

27、 s 8 FM/RF ALIGNMENT Si9nal Sourc* Siqnit flUgrwnt nK:at.ar Frquncw Rtucirk zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA tucirk tucirk tucirk 90 rtHi LICC CRf- to Pil. 3 fldjuii for MxiiHja output rn sJQfi rtucirk 106 mz TClOl tucirk UzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA/ N -

28、 I P A U S E BUTTON L E V E R 1921 14zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA SI I P CONTROL SPRING 1921 14 134 P A U S E U/ N -I P A U S E L E V E R 1921 14 55 12 i P A U S E U / U / f - v A S S Y C H A S S I S A S S Y 1921 01 5 0 1 E T C ? ? ! - i - S P E ACTUATOR SPRING 1921 14 16 P S

29、 U / L-/u/i-SP(B| BUTTON L E V E R SPRING (B) 1921 14 15 23 i ; - 7 S W M S W . 1 5 4 1 : L E A F SWITCH M S W - 1 5 4 1 T | 6401 01 1 4 9 PLY BUTTON LEVERSffl82l 01 SQ 24 25 7 1 HEAD P A N E L 1921 0 3 II 26 F / * J W i HEAD P A N E L 1921 0 3 12 27 I H E A D B A S E 1921 0 3 04 / 28 7 K - - c - :

30、1 HEAD B A S E 1921 0 3 0 6 29 / n U P SP ( P A N E L P SPRING 1921 0 3 0 3 30 h-n-.IUSP i M CONTROL SPRING 32 33 E H SP. ; E H SPRING 1821 0 3 0 8 7 - v ; S P i AZIMUTH SPRING 1821 0 3 0 7 35 f ? - D - 5 - 7 - A A S S Y : PINCH R O L L E R ARM A S S Y 1921 0 4 301 36 37 38 b7/-i SENSING L E V E R 1

31、921 2 6 0 4 39 R F 7 ? A S S Y R F C L U T C H A S S Y 1921 0 7 3 0 2 40 RF-;t- h R F B E L T 1921 0 7 0 3 42 43 7 -t-f l - A S S Y F L Y W H E E L A S S 1921 0 9 304 * / 1 - A S S Y F L Y W H E E L A S S Y 1921 0 9 3 0 3 45 G E A R P L A T E SPRING 1921 2 6 0 5 46 t - A S S Y 1 G E A R P U A T E A

32、S S Y 1921 26 502 47 I C A M GEAR 1921 2 6 0 2 48 _ L 49 I F F G E A R 1821 10 7 0 50 / - 3 S P i BACK TENSION SPRING 1821 10 qq NO. P A R T S NAME DESCRIPTION OTY 51 j-iiAss-y S U P P L Y R E E L A S S Y 1921 05 3Q6 2 52 7 7 7 7 J - J U A S S - Y T A K E U P R E E L A S S Y 1921 05 3GS 2 53 S E N S

33、 E R 1921 05 0 6 2 1 54 1 i 55 MOTOR B R A C K E T 1921 12 11 1 1 I 56 MOTOR R U B B E R 1820 13 0 6 3 57 MOTOR C O L L E R S C R E W 1821 12 02 3 58 - s - a - u -MOTOR P U L L E Y 1921 12 13 1 59 MAIN B E L T IC21 CQ 24 2 60 K V 7 (-ANTI VIBRATION F E L T MAT 1921 12 12 2 61 i j i : S2 E J E C T S

34、L I O E L E V E R 1921 13 0 2 2 63 1 i i 64 7 C ? S S P t 5 PACK SPRING 1829 10 01 2 65 P - K P. HEAD MSISR-AA2NI 1 66 RPN 7 K R.P. HEAO MSISR-AA2NI 1 57 E K E. HEAD LEISB-CI 1 68 j , _ MOTOR SHU-2LCC 1 69 R E C S * u / - R E C O R D S A F E T Y L E V E R 1821 10 69 1 70 71 C- K f ; M2x5 P TAPPING B

35、ING SCREV.- M2x5 9679 00 0 0 4 74 5 ? 7 f C t ; ! . M2x4.5 TAPPINO SCREW (FOR CAkiBAl M2i4.5 9999 18 0 9 4 75 i-Zi M2x6 S C R E W M2x8 9004 00 0 0 1 76 y-i : 7 ,+ 3 C A P S C R E W 2 7|5 722o CC CC 2 77 j / K=l M2x3 +:BIND S C R E W M2-.3 9115 00 0 0 2 7B TVTT, M2x7 AZIMUTH S C R E W h.;2x7 9922 00

36、0 0 2 79 C$- ( A ) PK C O L L E R SCREV. (A) 1821 12 2 3 1 94 * V - B ) C O L L E R (B) 8 2 1 12 65 1 95 P = l f 7 C U TUr CR f t UX PHO HO CD TAPE, FUM CTm i 8U I TC H 1X7881 EQ U ALI ZER ex I A3ei SL- nO TO R l ZC B UXUHE CO M TRO L PCM ER AM PLI FTER 8TKM W 8 M AI N PKAM PUFI R TA7794P nJUI Y NR

37、C K A l l O l TAPE RECO RD AHPUni R I4A LC TAei SSP PO HER 8UPPLY M C7M . 1 l ACK- LF M C78L0S l ACX- UP 2 1 I IC DESCRIPTIONS LC7230 SINGLE-CHIP PLL +CONTROLLER WITH LCD DRIVER The LC7230 is a single chip microcontroller with internal LCD driver and phase locked loop (PLL) circuitry and operates at

38、 a frequency of up to 150MHz. Functions High-speed and programmabie divider General purpose counter: HCTR for frequency measurement. LCTR for frequency or frequency cycle measurement. Note that the HCTR denotes the Horizontal counter and the LCTR, the Longitudinal counter. LCD driver: 56 segments (1

39、/2 duty and 1/2 bias) Program memory (ROM): 1 6 bits x 4096 Data memory (RAM): 4 bits x 256 All instructions: One-word in length Cycle time: 2.67 microseconds Stack levels: 4 Unlock flip-flop (FF): 0.55-microsecond detection and 1.1-microsecond detection Timer flip-flops (FF): 1 millisecond, 5 miili

40、seconds, 25 milliseconds and 125 milliseconds Data input ports: Two ports . One for exclusive key entiy and the other input port with high withstand voltage leve!. Note that each port consists of four pins. Data output ports: 2 for exclusive key output, one open drain type output port with high with

41、stand voltage level, 2 CMOS type output ports (One of them can be used as the LCD driver trom a user application program.) Note that each port consists of four pins. 1/0 port: One 1/0 port controllable in 4-bit units. One 1/0 port controllable in bit units. Note that each 1/0 port consists of four p

42、ins. Timeout error detectable and specific address settable On-chip voltage-controlled reset circuit Six-bit ADC (Analog-Digital Converter) Eight-bit DACx2 (DAC: Digital-Analog Converter as a Pulse Width Modulator (PWM) External interrupt level: One HOLD mode: RAM backup at reduced power dissipation

43、 Sensing flip-flop (FF) circuit for Hot/Cold start decision (VT = 1.3V to 2.57) PLL (Phase Locked Loop) circuit: 4.5V to 5.5V CPU: 3.5V to 5.5V RAM: 1.3Vto5.5V 22 Pin Assignment E x c l u s i i j e i n p u t u i t h MCH o p e n d r a i n tsipe With s t a n d u o l t a g e l e u e l 15U PH e/PH3 s e

44、l e c t a b l e a s t h e DAC o u t p u t 1 E x c l u s l u e i n p u t nput u i t h s t a n d w o l t a g e l e u e ! 6 5U Criaximum r a t i n g ) T h i s input u o l t a g e l e v e L c a n be a p p l i e d i r r e s p e c t i v e of t h e Upp l e w e l 3 L n c i j - C 0 P; i i = i | i i I- .-.icn

45、 lo u i o i o Lo z: i Q z: O u Q Lj X h M u z Icn _j X a: la; |0 , II O 2: O X Hiqh u i t h s t a n d u o l t a g e input p o r t s CNaxumum r a t i n g s ) 1 NT , R S , CftDl), SNS 6 5U 2 HOLD 13U S e l e c t a b l e a s LCR segment d r i u e r s E x c l u s i u e CMOS t y p e o u t p u t s 23 Func

46、tional Block Diagram 00 -Oconi -OSc5/10 Bflcs DS23/13 TESTan 24 Pin Description Pin Mam9 Pin No Functional Description I/O I/O Circuit Type PA O PA, Pflp PA3 35 34 33 32 Used exclusiely for data input These port pins can be used for key data entry Pull-doun resistance can be selected by the user opt

47、ion In this selection, all the four port pins are controUed at a time That i s , the pull-doun resistor cannot be selected for each port pin indiyidually Input to the port pins is inhibited during the BACKUP mode ON BflCK P Input 0- z-? Option PBQ PB 1 PB 2 PB 3 PC O PCi pce PC 3 PB O P B i PD2 PD,

48、30 29 28 27 2 Mirror detection, Defect detection and EFM (Eight to Fourteen Modulation) comparators. Features Single power supply operation +5V Dual power supply operation +-5V Low power consumption (100 mW at +-5V, 50 mW at +5V) Contents APO circuit allowing the use of both P-sub and N-sub laser diodes. Few external components Disc defect detection