Philips-MCM-530-Service-Manual(1) 电路图 维修手册.pdf

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1、GB CLASS 1 LASER PRODUCT COMPACT DIGITAL AUDIO Service Manual Service ServiceService ServiceService MCM530/21/22/30/37 TABLE OF CONTENTS Page Location of pc boards fr Reparaturen sind Original-Ersatzteile zu verwenden. I Le norme di sicurezza esigono che lapparecchio venga rimesso nelle condizioni o

2、riginali e che siano utilizzati i pezzi di ricambio identici a quelli specificati. After servicing and before returning set to customer perform a leakage current measurement test from all exposed metal parts to earth ground to assure no shock hazard exist. The leakage current must not exceed 0.5mA.

3、CLASS 1 LASER PRODUCT 3122 110 03420 GB Warning ! Invisible laser radiation when open. Avoid direct exposure to beam. SVarning ! Osynlig laserstrlning nr apparaten r ppnad och sprren r urkopplad. Betrakta ej strlen. SFVaroitus ! Avatussa laitteessa ja suojalukituksen ohitettaessa olet alttiina nkymt

4、tmlle laseristeilylle. l katso steeseen! DK Advarse ! Usynlig laserstrling ved bning nr sikkerhedsafbrydere er ude af funktion. Undg udsaettelse for strling. 1-6 1-7 WARNING! Use only the supplied speakers. The combination of the main unit and speakers provides the best sound. Using other speakers c

5、an damage the unit and sound quality will be negatively affected. Never make or change connections with the power switched on. Connect the AC power cord to the power outlet only after you have finished hooking up everything. To avoid overheating of the system, a safety circuit has been built in. The

6、refore, your system may switch to Standby mode automatically under extreme conditions. If this happens, let the system cool down before reusing it (not available for all versions). Step 1:Connecting FM/MW antennas Place the MW loop antenna on a shelf or attach it to a stand or wall. Extend the FM an

7、tenna and fix its ends to the wall. Adjust the position of the antennas for optimal reception. Position the antennas as far as possible from a TV, VCR or other radiation source to prevent unwanted noise. For better FM stereo reception, connect external FM antenna. MW MWMW Refer to page 3 - P5 Connec

8、tions Step 2:Connecting the speakers Connect the speaker wires to the SPEAKERS terminals, right speaker to R and left speaker to L, coloured (marked) wire to + and black (unmarked) wire to -. Fully insert the stripped portion of the speaker wire into the terminal as shown. Notes: Ensure that the spe

9、aker cables are correctly connected. Improper connections may damage the system due to short-circuit. Do not connect more than one speaker to any one pair of +/- speaker terminals. Step 3:Connecting to PC Use the supplied USB cable to connect the system to your personal computers USB port. After ins

10、talled the USB PC LINK application software onto your PC, you are able to playback your music collection via the system (refer to “USB PC Link”). Step 4:Connecting the AC power cord AUTO INSTALL PRESS PLAY may appear on the display panel when the AC power cord is plugged into the power outlet for th

11、e first time. Press on the main unit to store all available radio stations (page 3 P3) or press to exit (refer to “Tuner Operations”). Step 5:Inserting batteries into the remote control 1 3 2 1Open the battery compartment cover. 2Insert two batteries type R06 or AA, following the indications (+-) in

12、side the compartment. 3Close the cover. Using the remote control to operate the system 1Aim the remote control directly at the remote sensor (iR) on the main unit. 2Select the source you wish to control by pressing one of the source select keys on the remote control (for example CD, TUNER). 3Then se

13、lect the desired function (for example , , ). CAUTION! Remove batteries if they are exhausted or will not be used for a long time. Do not use old and new or different types of batteries in combination. Batteries contain chemical substances, so they should be disposed of properly. Connections Listeni

14、ng to an external source You can listen to the sound of the connected external device through your systems speakers. 1?Use the red/white audio cables to connect the systems AUX/CDR IN (R/L) terminals to the AUDIO OUT terminals on the other audio/visual device (such as a TV, VCR, Laser Disc player, D

15、VD player or CD recorder) If the connecting device has only a a single audio out terminal, connect it to the AUX/CDR IN left terminal. Alternatively, you can use a “single to double” cinch cable, but the output sounds still remain mono. 2?Press AUX repeatedly. Select “AUX”when connecting to a TV, VC

16、R or Laser Disc player. Select “AUX/CDR” when connecting to a CD recorder or DVD player. 3?Press PLAY on the connected device to start playback. Notes: All the sound control features (DSC, VEC for example) are available for selection. Always refer to the owners manual of the other equipment for comp

17、lete connection and use details. Timer OperationsOther Connection Temporarily deactivating the wake up timer You are only able to activate the Snooze function within 30 minutes after the timer wakes up from standby mode. 1?After timer wake up, press SNOOZE on the remote. The system will switch to st

18、andby mode for five minutes. After that, it resumes the last selected source again. 2?To cancel the snooze function, press SNOOZE again. Sleep timer setting The sleep timer turns the system to Eco Power standby mode at a preselected time. 1?Press SLEEP repeatedly until it reaches the desired preset

19、turn-off time. The selections are as follows (time in minutes): 15 30 45 60 90 120 OFF 15 SLEEP is shown, except for OFF mode. To view or change the setting, repeat the above. 2?Before the system switches to Eco Power standby mode, a countdown of 10 seconds is displayed. SLEEP 10 SLEEP 9. SLEEP 1 SL

20、EEP To cancel the sleep timer Press SLEEP repeatedly until OFF is displayed, or press the STANDBY ON B button. Important notes for users in the U.K. Mains plug This apparatus is fitted with an approved 13 Amp plug. To change a fuse in this type of plug proceed as follows: 1Remove fuse cover and fuse

21、. 2Fix new fuse which should be a BS1362 5 Amp, A.S.T.A. or BSI approved type. 3Refit the fuse cover. If the fitted plug is not suitable for your socket outlets, it should be cut off and an appropriate plug fitted in its place. If the mains plug contains a fuse, this should have a value of 5 Amp. If

22、 a plug without a fuse is used, the fuse at the distribution board should not be greater than 5 Amp. Note: The severed plug must be disposed of to avoid a possible shock hazard should it be inserted into a 13 Amp socket elsewhere. How to connect a plug The wires in the mains lead are coloured with t

23、he following code: blue = neutral (N), brown = live (L). As these colours may not correspond with the colour markings identifying the terminals in your plug, proceed as follows: Connect the blue wire to the terminal marked N or coloured black. Connect the brown wire to the terminal marked L or colou

24、red red. Do not connect either wire to the earth terminal in the plug, marked E (or e) or coloured green (or green and yellow). Before replacing the plug cover, make certain that the cord grip is clamped over the sheath of the lead - not simply over the two wires. Copyright in the U.K. Recording and

25、 playback of material may require consent. See Copyright Act 1956 and The Performers Protection Acts 1958 to 1972. Norge Typeskilt finnes p apparatens underside. Observer: Nettbryteren er sekundert innkoplet. Den innebygde netdelen er derfor ikke frakoplet nettet s lenge apparatet er tilsluttet nett

26、kontakten. For redusere faren for brann eller elektrisk stt, skal apparatet ikke utsettes for regn eller fuktighet. CAUTION Use of controls or adjustment or performance of procedures other than herein may result in hazardous radiation exposure or other unsafe operation. VAROITUS Muiden kuin tss esit

27、ettyjen toimintojen sdn tai asetusten muutto saattaa altistaa vaaralliselle steilylle tai muille vaarallisille toiminnoille. Italia DICHIARAZIONE DI CONFORMITA Si dichiara che lapparecchio MC M530, Philips risponde alle prescrizioni dellart. 2 comma 1 del D.M. 28 Agosto 1995 n. 548. Fatto a Eindhove

28、n Philips Consumer Electronics Philips, Glaslaan 2 5616 JB Eindhoven, The Netherlands 1-8 1-9 Functional Overview Main unit and remote control 1ECO POWER indicator Lights up when the system is in Eco Power standby mode. 2STANDBY ON B Switches to Eco Power standby mode or turns on the system. *Switch

29、es to standby mode. 3PLAYPAUSE CD: starts/pauses playback. USB PC LINK: starts/pauses playback. (only on the main unit) TUNER: *enters Plug it is a dual-frequency oscillator with ceramic resonators 5300 and 5302, which resonate at 500kHz and 425kHz res- pectively.The resonators are switched by trans

30、istors 7309 and 7316, controlled by the OZ_SW line from the port expander 7406. The reason for 2 frequencies is to avoid tuner disturban- ces in the AM-band. The oscillator signal is shaped to square wave with 7312-2, afterwards buffered and fed to the amplifier modulators (ROZ to the right channel,

31、 LOZ to the left). One channel gets inverted clock to balance supply loa- ding. Modulator The modulator forms the pulse width modulated signal. For each channel a seperate modulation is required. Power FETs The FETs require drivers which supply the gates. One for the high-side-FET and one for the lo

32、w-side-FET. Because of the different supply voltages also an additio- nal level shifter is necessary per driver. Output filter The output filter is necessary to block the 500kHz square wave signal from the speaker. Refers to the left channel in schematic diagrams. It consists of a series-mode coil 5

33、101 and a capacity of approx. 550nF (2116, 2134), which forms a Chebycheff filter with 40kHz cut-off frequency at 6 load. For EMC reasons both, the speaker output and the return ground are fed through a common mode coil (5102).The filter is further improved by splitting the output capacity into 2116

34、 before and 2134 after the common mode coil. All above mentioned circuitries are located inside the metal shielding box. LF Analog Audio Signal Modulated Digital Audio Signal +VL -VL +VL 0 0 -VL t Duty cycle 9:1 (DC value nearly +VL) Amplitude pos. max. Duty cycle 1:1 (DC value is zero) Amplitude ze

35、ro Duty cycle 1:9 (DC value nearly -VL) Amplitude neg. max. Class-D Circuit Description (BASED ONPOWER2003 MODULE75-150W CLASSD) V1L+7,5V+AMPV1L+7,5V V1L -37V +5V -45V -37V -45V -AMP-45V OFF ON OFFON Analog Pre-amp. Modulator Driver Power-amp. Level shifter Level shifter Square wave Oscillator analo

36、g audio signal f= 20Hz .20kHz amplified analog audio signal f= 20Hz .20kHz square wave 500kHz duty cycle 1:1 square wave 500kHz variable duty cycle 0V 5V 0V 5V square wave 500kHz variable duty cycle -45V +52V square wave 500kHz variable duty cycle -45V +45V square wave 500kHz variable duty cycle -45

37、V -39V output filter Blockdiagram Class D 2002 04 05 Blockdiagram Class D 11-211-2 Functional Description: Refers to the left channel in schematic diagrams. The first stage of the modulator is an error integrator which compares the input to the (24 dB amplified) output signal of the power stage.The

38、difference is leading to a current, which loads the integrator 7122-A.The second stage (7122-B) adds the 500kHz rectangular oscillator signal, creates high gain and low distortion and is again integra- ting.The output signal leads to a triangle wave form (see oscillogram E).The DC value of this tria

39、ngle signal is floa- ting, dependent on the amplitude of the analog input signal. The next stage is a comparator, which compares the inte- grated voltage with the internal switching levels - thus crea- ting a voltage controlled duty cycle. 7122 C and D improve the shape of the pulses. For details se

40、e oscillograms A-F. At pin 8 of IC7122 there is a square wave with the same frequency and duty cycle as the desired output. The next task is to feed this information to the output FETs. Both FETs are n-channel types, so they are modulated by feeding the gate in respect to the source connection. Inve

41、rters 74LV14 are used as drivers.The driver for the low- side FET (7121) is supplied by the negative supply -VL2 and a voltage +VL (generated by 7115 and 6113), which is 7.5V higher than -VL2.The digital signal is level-shifted by 7128 to the low side driver stage. 3142, 6111 and 2126 together form

42、a delay circuit for rising edges by approx. 100ns for the low side FET. 3154, 6109 and 2137 delay the rising edge by 50ns for the high side FET.This to compen- sate the switch-off delay of the FETs and ensures that both FETs are not conducting at the same time. The high-side FET (7109) is controlled

43、 by the inverted sig- nal taken from pin 2 of 7118, which is level-shifted by transi- stor 7119.The driver for the high-side FET is supplied by a floating voltage between the amplifier output -V1L and +V1L, created by the charge pump 6110, 2114 regulated by 7114 and 6114 to a 7.5V higher level.The p

44、ump is additio- nally supplied (via 3151) by +45V to ensure supply at start- up (no signal).The last stage in the gate driver consists of three gates in parallel for increased output current for the capacitive load of the FET. For additional increase of the switching speed push/pull transistors 7132

45、/7111 are added. Protection Circuits: The amplifier is protected against low load impedance (including short circuit). Current is sensed by shunts 3101, 3130 in both supplies. Overcurrent at the positive supply is then sensed by 7104, the negative supply overcurrent trig- gers 7117, which then also

46、triggers 7104.The collector cur- rent in turn triggers the monoflop 7122-5 and -6, giving a High pulse at pin 10.This shuts off level-shifter 7128 and blocks transistor 7129 and 7131, which draws current into the emitter resistor 3134 of level-shifter 7119. It is now also shut off. So, both FETs are

47、 shut off within approx. 0,2 sec. The monoflop can be reset by: - switching mains off and on again - pressing Standby button and afterwards any source button - plugging headphone in for a short moment When a headphone is used the amplifier is shut off.This is done by pulling pin 13 of 7122 via signa

48、l line AMP_OFF and transistor 7130 to high level.The line AMP_OFF is controlled by the port expander 7406 which detects the headphone via signal line HP_DET. The loudspeakers are protected against DC voltages resul- ting e.g. from defective FETs.Voltages higher than 2V are detected by 7110 respectiv

49、ely 7112.The transistors conduct and pull the DC_PROT line down, blocking transistor 7243 which in turn disables speaker relay 1201. Adjustments: The gain of the class-D amplifier is 24dB, adjusted by the feedback resistors 3155, 3136, 3149 and the input resistors 3139, 3340.The input reference voltage for 7122-A is approx. half the supply, therefore 3144, 3148 are used for offset compensation.This compensation has to be fine- tuned with trimpotentiometers 3306 and 3307 to obtain 1mV DC output. Service Hints: The analog part of t