Panasonic-SCHM900-cs-sm 电路图 维修手册.pdf

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1、ROZMO121 Service Manual r SC-HM900 SB-PS70 r- SB-HM900SA-HM900 r- Stereo system SC-H M900 , SB-HM900 ESPECIFICA TIONS r- Notes: 1. AIItheinformation aresubjecttochangewithoutnotice. 2. Weigthanddimensions areapproximate. ,. Panasonic (illol! DIGITALAUDIO MODELUNIT SA-HM900Stereo SC-HM900 SB-HM900 Fr

2、ont Speaker SB-PS70 Surround Speaker SB-PC70 Cantar Speaker POWER OUTPUT (AMPLlFIER) Front (Low) 130W RMS par ehannel (6 Q), 80 Hz , 10% DAT (High)70 WRMS par ehannel (6Q), 1 kHz , 10% DAT Surround50W RMS par ehannel (8 Q), 1 kHz, 10% DAT Central100W RMS (8Q), 80 Hz, 10 % DAT AMPlIFIERSA-HM900 Power

3、 output: 7000 W PMPO Power eonsumption: 280 W Supply: 127V ea :t10% 60 Hz Input sensitivity: 250 mV Freeueney ranga AM:522 - 1629 kHz (9 kHz steps ) 520-1630 kHz (10kHz steps) Freeueney ranga FM:87,5 - 108,0 MHz (50 kHz steps ) Dimensions (b x h xl): 360 x 425 x 340 mm Weight:9,8 kg approx. RadioFan

4、s.CN 收音机爱 好者资料库 SC-HM900I Lh WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general publico It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. P

5、roducs powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the porduct or producs dealt with in this service information by anyone else could result in serious injury or death. CONTENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14

6、15 16 17 18 19 20 page Safety Precaution3 Before Repair and Adjustment4 Protection Circuitry4 Accessories4 Handling Precautions For Traverse Deck5 Precaution of Laser Diode6 Operation Procedures7 OperationChecks and Main ComponentReplacementProcedures9 Self-DiagnosticFunction 17 Description of Error

7、Cede18 Cd Test Mode Function19 Measurements and Adjustments20 lIIustration of IC, Transistorsand Diodes:23 Terminal Function of IC24 Block Diagram27 Schematic Diagram35 Printed Circuit Board48 Wiring Connection Diagram59 Troubleshooting Guide60 Pars Location and Replacement Pars List61 - 2- - PSPEAK

8、ERSINPUTDIMENSIONS WEIGHT IMPEDANCE (b x h x 1) SB-HM900 FRONT355 x 560 x 340 mm 9,2 Kg aprox. Super Tweeter 3cm - - - - - - Tweeter6cm - - - - - - Woofer17 cm - - - - - Super Woofer 30 cm - - - - - (high) 612 - - - - (Iow) 612 - - - - SB-PS70 SURROUND FuI!Range 8 cm812 170 x 106x 118 mm 0,9 Kg apro

9、x. SB-PC70 CENTER812250 x121x147mm 1,6 Kg aprox. Tweeter6cm Woofer10 cm A RadioFans.CN 收音机爱 好者资料库 ,.-. ,. ,. ,. r- 1SC-HM900 1 Safety Precaution 1. 2. 3. 4- 5. Before Servicing, unplugthe power cord to prevent an electric shock. When replacing parts, use only manufactures recommended components for

10、safety. Check the condition of the power cardoReplace if wear or damage is evident. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance t

11、est to prevent the customer from being exposed to a shock hazard. 1.1Insulation Resistance Test 1. 2. 3. Unplug the power cord and short the two prongs of the plug with a jumper wire. Turn on the power switch. Measure the resistancevalue with ohmmeter betweenthe jumper AC plugand each exposed metal

12、cabinet part, such as screwheads, antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3MQ and 5.2MQ to all exposed parts* (Fig.1). Equipment without antenna terminals should read approximately infinity to all exposed parts. (Fig.2). *Note: Some exposed

13、 parts may be isolated from the chassis by designoThese will read infinity. 4. If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be repaired and rechecked before it is returned to the customer. Exposed metal,./ par! Fig.1 Resistance =

14、3MO - 5.2MO Exposed metal/ par! Fig-:2 Resistance=Approx00 - 3- RadioFans.CN 收音机爱 好者资料库 SC-HM900J 2 Before Repair and Adjustment Disconnect AC power, discharge Power Supply Capacitors POWER PCB C556, C557, C558, C559, C561 and TRANS- FORMER PCB C705 through a 10 Q, 5W resistorto ground. DO NOT SHORT

15、-CIRCUIT DIRECTLy (with a screwdriver blade, for instance), as this way destroy salid state devices. After repairs are completed, restore power gradually using a variac, to avoid overcurrent. Current consumption at AC 127V, 60Hz in NO SIGNAL mode should be 800mA. 3 Protection Circuitry The protectio

16、n circuitry may have operated if either of the following conditions are noticed. . No sound is heard when the power is turned on. Sound stops during a performance. . The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are

17、shorted, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used. If this occurs, follow the procedure outlines below: 1. 2. 3. Turn off the power. Determine the cause of the problem and correGit. Turn on the power once again after one minute. Note:

18、Whentheprotection circuitryfunctions,theunitwillnotoperateunlessthepowerisfirstturnedoffandthenonagain. 4Accessories Ac cord1 pza (SJA168-1A)DtR)1 pza Dfs-)1 pzaD Battery(remotecontrol)2 pzas (UM-3PA) e DtRMM support1 pzaD2ol113) 1pza ,.-. -4- . SC-HM900 5 Handling Precautions For Traverse Deck f Th

19、e laser diode inthe traverse deck (optical pickup) may break down due to potential difference caused by static electricity of clothes or human body. So. be careful of electrostatic breakdown during repair of the traverse deck (optical pick up). Handlingof traverse deck (optical pickup) 1.Do not subj

20、ect the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock. 2.The short land between the No. 4 (LO)and No. 5 (GND) pins on the flexible board (FFC) is shorted with a solde build- up to prevent damage to the laserdiode. To connect to the PC board be

21、sure to open by removing the solder build-up and finish the work quickly. 3.Take Gafenot to apply excessive stress to the flexible board (FFC). 4.Do not turn the variable resistor (laser power adjustment). It has already been adjusted. Flexible board. FFC (Handle it carefully) Lens (Donottouch) / I

22、f - , / / No.Pin(GND)No.)Pin(LO) Variable resistor (Do not lum) Grounding for electrostatic breakdown prevention 1. Human body groundling Use the anti-satatic wrist strap to discharge the static electricity from your body. Work table grounding Pul a conductive material (sheet) or steel sheet on the

23、afea where the traverse deck (optica! pickup) isplaced, and ground the sheet. r 2. Caution: The static electricity of your clothes will not be grounded through the wrist strap. So, take Gafenot to le your clothes touch the traverse deck (optical pickup). Caution when Replacingthe Traverse Deck: The

24、traverse deck has a short point shourted with solder to proteGthe lazer diode against electrostatics breakdown. Be sure to remove the solder from the short point before making connections. ,. Wriststrap (Anti-staticbracelet) Iron plateor somemetals to conductelectricity - 5- SC-HM900 6Precaution 01

25、Laser Diode CAUTION: This unit utilizes a class 1 laser. Invisible laser radiation is emitted from the optical pick up lens. When the unit is turned on: 1.Do not look directly into the pick up lens. 2.Do not use optical instruments to look at tlle pick up lens. 3.Do not adjust the preset variable re

26、sistor on the pick up lens. 4.Do not disassemble the optical pick up unit. 5.If the optical pick up is replaced use the manufacturess specified replacement pick up only. 6.Use of control or adjustments or performance of procedures other than those specified here in may result in hazard- ous radiatio

27、n exposure. 1 CAUTION! THIS PRODUCT UTILlZES A LASER. USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECI FIED HERE IN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE. - ,. - 6- . 7 Operation Procedures . r 101 m - - . ,I ,m, ,O -. ISC-HM900 aMain unit No.Name CD Ac supply

28、indicator (AC IN) (This indicalorlighls when Ihe unil is connecledlo Ihe AC power supply) ()Standby/on switch (6/1 POWER) Presslo switchIhe unil Irom onlo slandbymodeor viceversa.In slandby mode, Ihe unil is slill consuminga small amounl01 power. Play timer/record timer button(e)PLAY/e)REC) Clock/ti

29、mer button (CLOCKlTIMER) Signal sensor 6ch button (6 CH INPUT) (j)Karaoke select button KARAOKE Microphone volume control (MIC VOL) Microphone jacks 1 y 2 Deck 1 open button ( DECK 1 OPEN) Deck 1 cassette holder Disc tray Cd manager button (CD MANAGER) J Disc direct play and indicators (1 - 5) Disc

30、tray open/close button ( ) Super 3d ai button (SUPER 3D Al) Super sound eq button (SUPER SOUND Ea) Sound equalizer knob (SOUND Ea) Sound equalizer control (SOUND Ea) Volume control (VOLUME DOWN UP) Headphones jack (PHONES) Deck 2 open button ( DECK 2 OPEN) eDeck 2 cassette holder rnConsola central A

31、ux select button (AUX 1/2) Tuner/band select button (TUNER BAND) Tape/deck select button (DECK 1/2 TAPE) Cd button (CD) Display Reverse mode select button (REV MODE) Tape edil button (TAPE EDIT) Dolby pro logic button (JPRO LOGIC) Display selectldemostration button (-DISPLAY/-DEMO) Recording button

32、( .REC/STOP) Surround button (SURROUND) Super woofer on/off button (S. WOOFER) Basic operating button (Funclionschangeaccordinglo Ihe source) - 7- SC-HM900 IRemote control Numbers such asO,lunction is exactlythe sameway as the buttonson the main unit and the number such as ,lunction only with remate

33、 control. No.Nombre f)Standby/on button ( ) Auto power-off (AUTO OFF) Numeric buttons (;: 10,1-9,O) Program button (PROGRAM) Cancel button (CANCEL) Aux selector button (AUX 1/2) eTuner/band select button (TUNER) G)Eq select button (Ea) e3d ai button (3D Al) a.Dolby Pro Logic button ( PL) Play/pause/

34、presetchannelselectbutton (only lor cd play) (/11IV ) Test button (TEST) Channel selector button (CH SELECT) G Volume buttons (- VOLUME +) Sleep button (SLEEP) Muting button (MUTING) Disc button (DISC) Random button (RANDOM) Repeat button (REPEAT) GDisc button (CD) eTape/deck selct button (TAPE) Ski

35、p/search bullan ( 1+11/-, /) Play/preset channel select ( /) Stop/clear program melodies (8/CLEAR) Channellevel selector buttons (- CH LEVEL +) - ,. ,., - 8- Z; ISC-HM900 8 Operation Checks and Main Component Replacement Procedures r- IGear for servicing (jig) informationI 1. This unthas a gear whic

36、h is usedfor checking items (open/close of disc tray, up/down operation of traverse unit by manually) when servicing. 2. For preparation of gear (for servicing), Performthe procedures as follows. 3.In case of re-servicingthe same gel, the gear for servicing may has been taken off because ithas been

37、used. The gear for servicing must be stored. 1. Remove the gear provided with mechanism cover as shown below. 2. Insertthe hexagonal screwdriver (2 mm) into the gear and then project the tip of screwdriver for 12mm in length. t- Gear. nHexagonal screwdnver VIPart No. : SZZP11 0.1C Mechanism caver-1

38、1-2mm c=: - , ATTENTIONSERVICER 2. Some chassis components may have sharp edges. Be careful when disassembling and servicing. 1.This section describes procedures for checking the operation of the majar printed circuit boards and replac- ing the main components. For reassembly alter operation checks

39、or replacement, reverse the respective procedures. Special reassembly procedures are described only when required. 3.Select items from the followingindex when checks or replacement are required. r Contents eDisassemblyandassemblymain unit 1. Checking of the Main, Panel, Deck and Power P.C.B. Main co

40、mponent Replacement Procedures 1. Replacementof the Traverse Deck. 2. Replacement of the Power Amplifier IC. eDisassemblyand assemblyof theTraverseUnit eDisassemblyandassemblyof the DiscTray Warning: This product uses a laser diode. Refer to caution statement Precaution of Laser Diode. e ,- - 9- SC-

41、HM900I 8.1 Disassembly and assembly main unit Step 1 Remove 4 screws each side and remove the Top Gabinet. E)x4 Step 3Pul!out the CD tray as shown and remove the CD lid. Push back the CD tray after the CD lid has been removed. Step 2 To open the CD tray, releasethe le- ver as shown. E)x 4 Step 4 Rem

42、ove the screws. G) 0 x16 . - 10- r Step 5Removethe wire CN309 (main P.C.B.) and CP606 (panel P.C.B.). Step 6Releasethe 2 catches and remove the CD changerbasetogetherwiththe CDchanger. ,- -. Main . - Step 7 Remove 4 screw. Qx2 ,. Heat Sink I SC-HM900 Checking tor Main, Panel, Deck and Power P.C.B. T

43、ranstormer Deck E):RHD30002-H 4:): XTBS3+8JFZ1 ea:XTB3+20J - 11- SC-HM900I 8.2 Main Component Replacement Procedures 1. Replacement01 the TraverseDeck Step 1Follow the proceduresin Disassembly of the Traverse Unit (Step 1 - Step 4) Stap3 (1 screw. driver boss pin Step 3Desolder the 4 legs of the 2 m

44、otors and pul! out the Servo P.C.B. Step 4Widen the 3 bosseswith a flat screwdriver and pull out the 3 pins. Then remove the Traverse Deck.B. SeNO P.C.B. TfaverseDeck - 511 e Step 5Remove the flexible cable CN701 . .Removal of the flexible cable. Pushthe top of the connector inthe direction of the a

45、rrow 1,andthen pul! out the flexible cable in the direction of the arrow 2. Note: Insert a shortpin into the flexible cable for traverse unit. .Installationof the CD servoP.C.B. afterre- placement. Step 1Connect the FFC board. Step 2Instal!the CD servo P.C.B. in the traverse deck assembly. - 12- r .

46、- - - , - , Note: Before installing the CD servo P.C.B., move the opti- cal pick up towards the outer edge from the marking (black triangle). (Otherwise, the reset detect switch (8701) mounted on the CD servo P.C.B. may be damage.) aptical pickup 2. Replacement of the PowerAmplifier IC Step 1 Follow

47、the proceduresinCheckingProcedure for each majar P.C.B. (8tep 1- 8tep 7). 1SC-HM900 Step 2Removethe wires at CP502, CP503, CN304 and W500/H500 and pull out the Main P.C.B. CN302 CN303 CN304 W500/ H500 J= Step 3Remove 4 screws fixed to the Power Ampli- fier IC. Step 4Unsolder the terminal of Power Am

48、p IC and replace the respective component. ex2ex2 Power Amp IC IC500 (R8N313H25-P) Power Amp IC IC501 (R8N311W64B-P) Q:XTBS3+8JFZ1 e:XTB3+20J e:XTW3+15T -13- SC-HM900I 8.3 Disassembly and assembly of the Traverse Unit Step 1Place the traverseunit as shown. Step 2Press in the lever shaft in the direc

49、tionof arrow 1 as shown and push the traverseunit into the positionin the direc- tion of arrow 2. Step 1 Step 2 Push the lever from position A to B. Pullthe stopper (black) inthe direction of arrow 1and push the lever in the direciton of arrow 2. Push the stepeer (black) down until the white lever eject out. Step 3 Step 4Lift up the traverse unit and slide out the unit as shown. .Replacement01 TraverseUnit 1t Step 3Pull the stopper in the direction of