Philips-MX-3950-D-Service-Manual电路原理图.pdf

CLASS 1LASER PRODUCTService ManualServiceServiceServiceMX3900D/37TABLE OF CONTENTSPageLocation of pc boards für Reparaturen sind Original-Ersatzteile zu verwenden.ILe norme di sicurezza esigono che lapparecchio venga rimessonelle condizioni originali e che siano utilizzati i pezzi di ricambioidentici a quelli specificati.“After servicing and before returning set to customer perform aleakage current measurement test from all exposed metal parts toearth ground to assure no shock hazard exist. The leakage currentmust not exceed 0.5mA.“CLASS 1LASER PRODUCT3122 110 03420GB Warning !Invisible laser radiation when open.Avoid direct exposure to beam.S Varning !Osynlig laserstrålning när apparaten är öppnad och spärrenär urkopplad. Betrakta ej strålen.SF Varoitus !Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiinanäkymättömälle laserisäteilylle. Älä katso säteeseen!DK Advarse !Usynlig laserstråling ved åbning når sikkerhedsafbrydere erude af funktion. Undgå udsaettelse for stråling.2-1 2-1DISMANTLING INSTRUCTIONSDismantling of the Front Panel assembly1) Loosen the 9 screws to dismantle the Top Cover (pos252)- 2 screws on each side- 5 screws on the Rear Panel (pos 251).Dismantling the Tuner, Mains and AV boards2) Loosen 4 screws A and 6 catches C1 to slide the FrontPanel assembly (pos 101, 102, 103, etc) as per figure 1.Note: To remove the Source / Volume control pcboard (pos 1105B) 2 nuts hidden below thecontrol knob assembly (pos 133, 134 and 135)must first be removed.Hints for re-assembly of Top CoverDue to appearance design the Top cover (pos 252) issandwiched between the Front panel (pos 101) and the 2side covers (pos 102 & 103), this make it necessary toremove the 2 side covers before re-assembly of Top cover.1) To remove the side cover use a small screw driver withmarking 16mm from the tip end.2) Insert the screw driver into slot (as shown in figure 2) andpush the tip outwards to release the side cover catch.The side cover can be pull outwards as soon as the topcatch is released.AAAAC1C1C1C1C1C1Figure 1Figure 21) Loosen 3 screws D and 2 catches C2 on the Rear panel(pos 251) to remove the Tuner board assemby (pos 1101)as pe figure 3.2) Loosen 1 screws E and 2 catches C3 to unslot the Mainsboard (pos 1102-A) out of the Rear panel as per figure 4.3) Loosen bracket (pos 254) by turning a catch, slidingtowards the outside and lifting it upwards as per figure 5.4) Loosen 7 screws F and 2 C5 to separate Rear Plateassembly (pos 251 + 227) from the Bottom plate as perfigure 3.5) Uncatch C4 to remove the AV board (pos 1104) from theBottom & Rear Plate assembly (pos 251 + 227) as perfigure 5.Dismantling the 5DTC Module1) Loosen 1 screws E and 2 catches C3 to remove theMains board as per figure 4.2) Loosen bracket (pos 254) by turning a catch, slidingtowards the outside and lifting it upwards as per figure 5.3) Loosen 3 screws G, lift up the 5DTC Module's (pos 1103-A) rear and pull the module out towards the rear as perfigure 6.Figure 3Figure 5C412Turn up the lever,slide the bracketas shown and liftout of the bottomchassis.Figure 4GGFigure 62-2 2-2Dismantling the Mono FE and BE boards1) Loosen 2 screws and 2 catches to remove the Mono BEboard (pos 1103-B).2) Loosen 2 screws and 2 catches to remove the Mono FEboard (pos 1103-C).Dismantling the Supply & Power Amplifier boards1) Loosen 2 screws B mounting the Supply board's (pos1102-B) heatsink to the Bottom Plate (pos 227) as perfigure 7.Note: During re-assembly care must be taken toensure the Mains Transformer wires to theSupply board is routed properly below theboard.2) Loosen 4 screws C to dismantle the Power Amplifierboard (pos 1102-D) from the Bottom Plate as per figure7.Figure 7Service position A (Top cover removed)Service positionsService position B (Front Panel loosen)Service position C (Supply and Amplifier boards loosen) Service position D (Mains & AV boards loosen)Service position E (5DTC Mechanism, Mono FE and MonoBE boards loosen)Caution:1) In some of the service positions the Mains supply isexposed, therefore service technicians have to exercisecare to prevent electric shock.2) The copper pattern on the Mains board should be cov-ered with non-conductive insulation during fault-findingon other parts of the set.3) Insulation sheet (eg. thick paper or cardboard) should beuse during fault-finding to prevent short-circuiting ofcopper patterns to metallic surroundings.Service positions2-3 2-3Thick paperThick paperMains Boardwith non-conductiveinsulationattached to thecopper patternNote:The ground connection between AV board stoko pin1100 and Amplifier board stoko pin 1320 must be con-nect ed during Service pos C and D in order to havesound output at the Loudspeakers.3-1 3-1Variousother TestsActivated with ACTIONTESTSEEPROM FORMATTESTLoad default data. Display shows “NEW“ for 1 second.Caution!All presets from the customer will be lost!Disconnectmains cordLEAVE SERVICETEST PROGRAMT9 to ExitEEPROM TEST Some test patterns will be sent to the EEPROM.“PASS“ is displayed if the uProcessor read back the test patterns correctly, otherwise “FAIL“ will be displayed.SUBW +(Remote Control)AUTO STANDBYTOGGLEPressing this button will toggle between the status“AUTO STANDBY ON“ and “AUTO STANDBY OFF“.The status will scroll once across the Display.SOURCE / VOLUMEKnobROTARYENCODER TESTDisplay shows value for 2 seconds.Values increases or decreases in steps of 1 until 0 (Min.) or 40 (Max.) is reached.Figure 2Figure 1YNYNNBIIButton pressed?BIIButton pressed?DISPLAYTESTDisplay shows Figure 1 and Standby LED isGreenDisplay shows Figure 2and Standby LED isREDY9Button pressed?YNYNSEATINGButton pressed?ADCTESTDisplay shows“ADC Value“(Ref Table 1)YN9Button pressed?Note:ADC Test is used for checking the ADC inputs to the microprocessor. The displayshows an ADC value between 0 and 255 for an input signal between 0 and 5V.NSEATINGButton pressed?YDisplay shows next“ADC Value“(Refer Table 1)Has it reach“ADC5 Value“ ?Table 1NameADC1ADC2ADC3ADC4ADC5Input line touProcessor ICKey0Key1VU_INMUX_DETOptionsRemarksReturn the value assign for each key button.Return the value assign for each key button.Varies according to the signal dc levelThe set temperature is measured via this NTCline, if lower than 69 the set goes into Standby.Return the value assign for the different possibleoptionsCLOCK-TIMERButton pressed?YYYNNNCLOCK-TIMERButton pressed?9Button pressed?Display shows32KOutput at (Front Board)pin 19 of uP = 2048HzDisplay shows12MOutput at (Front Board)pin 19 of uP = 2,929.6875HzQUARTZTESTTUNINGButton pressed?DisconnectMains cord ?YYNNYDisplay Tuner Version “ccc“Service frequencies arecopied to the RAM (see Table 2)Tuner works normally except:PROGRAM buttonService Mode leftTUNERTESTTUNINGButton pressed?NPRESET1234567891011Europe“EUR“87.5MHz108MHz531kHz1602kHz558kHz1494kHz87.5MHz87.5MHz87.5MHz87.5MHz98MHzUSA“USA“87.5MHz108MHz530kHz1700kHz560kHz1500kHz98MHz87.5MHz87.5MHz87.5MHz87.5MHzOversea“OSE“87.5MHz108MHz530/531kHz*1700/1602kHz*560/558kHz*1500/1494kHz*98/87.5MHz*87.5MHz87.5MHz87.5MHz87.5/98MHz*Note: * Depending on the selected grid frequency (9 or 10kHz).By holding the “DISC5“ and “STANDBY-ON“ buttons depressed while switching on the Mains supply, one of theundermentioned features will be activated:- the tuning grid frequency is toggled between 9kHz and 10kHz for the Oversea (/21) version.Table 2East Europe“EAS“87.5MHz108MHz531kHz1602kHz558kHz1494kHz87.5MHz87.5MHz87.5MHz87.5MHz98MHzEast Eur. Extended-band“EAS“65.81MHz108MHz74MHz87.5MHz531kHz1602kHz558kHz1494kHz98MHz70.01MHz65.81MHzTo start service test programhold DISC1 & STANDBY-ONbuttons depressed whileplugging in the mains cord*Display shows theROM version “S-Vyy“S refers to Service ModeV refers to Versionyy refers to Software version number of the uProcessor(counting up from 01 to 99)SERVICE TEST PROGRAM I5DTC MX. Range Service Test Program dd wk0302MAIN MENU* Hold till the Display is shown