Jvc-RCEX-30-B-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2004 Victor Company of Japan, LimitedNo.MB2792004/6CD PORTABLE SYSTEMMB27920046RC-EX30BTABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-145 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15PUSHPLAY/PAUSESTOPPROGRAM/CLOCK SETHBS/PRESET EQPRESETUPPRESETDOWNDISPLAYTAPECDBANDRANDOMTUNERGROUPREMOTESENSORTAPEFM MODE/BEAT CUTPROGRAM/CLOCK SETUPDOWNINTROHBS/PRESET EQREPEATSTANDBY/ONDISPLAYMUTINGPRESETVOLUMERM-SRCEX30J REMOTE CONTROL1234567890OVERCD/RANDOMTUNER/BANDGROUP+Area suffixA - AustraliaB - U.K.E - Continental EuropeEN - Northern EuropeEV - Eastern EuropeSERVICE POLICYNo service part is available for this model.Exchange only.1-2 (No.MB279)SPECIFICATIONDesign and specifications are subject to change without notice.CD player CD capacity 1 CDSignal-to-noise ratio 75 dBDynamic range 60 dBTuner Frequency range FM 87.5 - 108.0 MHzAM 522 - 1 629 kHzAntennas Telescopic antenna for FMFerrite core antenna for AMCassette deck Frequency response 60 Hz - 10 000 HzWow & flutter 0.15% (WRMS)Fast wind time Approx. 150 sec. (C-60 cassette)General Speakers 9 cm cone × 2Speaker impedance 4 Output power 4 W (2 W + 2 W) at 4 (10% THD)Output terminals PHONES × 1Power supply AC 230 V , 50 Hz DC 9 V (R20 (SUM-1)/D (13D)-size batteries × 6)Power consumption 18 W (at operation) 3 W (on standby)Dimensions 420 mm × 178 mm × 250 mm (W/H/D)Mass Approx. 3.2 kg (without batteries)(No.MB279)1-3SECTION 1PRECAUTIONThis service manual does not describe PRECAUTION.1-4 (No.MB279)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB279)1-5SECTION 3DISASSEMBLY3.1 Main body3.1.1 Removing the rear cover assembly section (See Fig.1 to 3)(1) Remove the eight screws A, the three screws B and thefour screws C attaching the rear cover assembly on theback of the body.(2) Remove the battery cover on the back of the body and re-move the two screws D attaching the rear cover assembly.(3) Move the rear cover assembly in the direction of the arrowand remove. At this time, disconnect the wire from connec-tor CN406 and FM-ANT on the main board.Fig.1Fig.2Fig.3CBCADAADBattery coverFM-ANTTop cover assemblyRear cover assemblyTuner boardCN406Front panel assemblyMain board 1-6 (No.MB279)3.1.2 Removing the top cover assembly section and the front panel assembly section (See Fig.4 to 8) Prior to performing the following procedure, remove the rearcover assembly.(1) Release the tab a of the handle using a screwdriver. Returnthe handle below and pull out in the direction of the arrow.(2) Disconnect the wire from connector CN404 and 4pin con-nector on the main board.(3) Remove the six screws E and the two screws F attachingthe top cover.(4) Draw out the top cover assembly from the front panel as-sembly section backward.(5) Disconnect the wire from connector CN501 and CN506 onthe main board, and disconnect the card wire from connec-tor CN507 and CN508.(6) Disconnect the wire from board connector CON301 of thecassette mechanism assembly.Fig.4Fig.5Fig.6Fig.7Fig.8tab atab aHandleCN404Main board4pin connectorFront panel assemblyTop cover assemblyETop cover assemblyEEECD doorFMain boardCN501,CN506Main boardCN508,CN507Cassette mechanism board CON301(No.MB279)1-73.1.3 Removing the main body (See Fig.9, 10)Caution:Make sure to solder the short-circuit point on the CD servoboard before disconnecting the card wire from connectorCN201 on the main board and from the CD servo board. If youdon't observe this instruction, the pickup may be damaged.(1) Remove the eight screws G attaching the main board onthe top cover assembly.(2) Disconnect the wire from connector CN501, CN502,CN511, CN202, CN401 and CN504 on the main board.(3) Disconnect the card wire from connector CN201 on themain board.Caution:If necessary, cut the band.Fig.9Fig.10CN504CN501CN202CN201CN502G GGGGCN511BandCN401UnsolderShort-circuit pointCD servo board1-8 (No.MB279)3.1.4 Tuner board (See Fig.11) Prior to performing the following procedure, remove the mainboard.(1) Remove the three screws H attaching the tuner board.Fig.113.1.5 Removing the top switch board (See Fig.12) Prior to performing the following procedure, remove the mainboard and the tuner board.(1) Remove the four screws J attaching the top switch board.Fig.12HHTuner boardJJTop switch board(No.MB279)1-93.1.6 Removing the volume board and the power switch board (See Fig.13 to 16) Prior to performing the following procedure, remove the mainboard.(1) Remove the three screws K attaching the volume board.(2) Pull out the volume board from the volume knob.(3) Remove the four screws L attaching the cover on the sideof the power switch.(4) Release the three tabs b of the cover on the side of thepower switch.(5) Remove the three screws M attaching the power switchboard to the cover.Caution:If necessary, unsolder the solder points.Fig.13Fig.14Fig.15Fig.16KKVolume boardSolder pointTop cover assemblyVolume boardKKVolume knobSwitch boardSolder pointSide top coverSwitch boardTab bLMMSide top coverPower switch boardSolder point1-10 (No.MB279)3.1.7 Removing the CD mechanism assembly (See Fig.17) Prior to performing the following procedure, remove the mainboard.(1) Remove the four screws N attaching the CD mechanismassembly.Fig.17NNCD mechanismassemblyTop cover assembly