RAM_Audio_S-Series_Service_Manual 电路图.pdf

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1、SERVICE MANUAL P-5343-006 QXPSDoc 1/07 2007 by C.E. Studi o-2 s.l. - Spai n (EEC) http:/www.ramaudi e-mai l: supportramaudi Professional Power Amplifiers S S Series 1500-2000-3000-4000-6000 3004-4004-4044-6004-6044 RadioFans.CN 收音机爱 好者资料库 WARNING: The ex clamati on poi nt i nsi de an equi lateral tr

2、i angle i ndi cates the ex i stence of i nternal components whose substi tuti on may affect safety. The li ghtni ng and arrowhead symbol warns about the presen- ce of uni nsulated dangerous voltage. To avoi d fi re or electrocuti on ri sk do not ex pose the uni t to rai n or moi sture. To avoi d ele

3、ctri c shock , do not open the uni t. No user servi ci able parts i nsi de. I n the case of di sfuncti on, have the uni t check ed by quali fi ed agents. SAFETY PRECAUTIONS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN 2010 by C.E. Studi o-2 s.l. Pol.I nd. La Fi guera C/ Rosa de Lux emburgo, 34 46970 A

4、laquas - Valenci a - SPAI N Phone: +34 96 127 30 54 Fax : +34 96 127 30 56 http:/www.ramaudi e-mai l: supportramaudi RAM Audi o, PMS, SSP, I CLand QuantaPulseis regi stered trademark s of C.E. Studi o-2 s.l. All other names are trademark s of thei r respecti ve compani es. RadioFans.CN 收音机爱 好者资料库 Th

5、e S seri es i s a hi power ampli fi er composed by 2 or 4 channel class H technology fed by a swi tchi ng power supply. I t has twi n male-female XLR back pannel i nput connectors per channel wi th the posi bi li ty to work i n ste- reo, parallel or bri dge modes. Has too a gai n selecti on swi tch

6、whi ch permi ts work at 26, 32 or 38 dB, and a selectable subsoni c fi lter. I t has four front pannel i ndi cators per channel to i nform the ampli fi er operati ve status and a potenti ometer attenuator per channel to adjust the output level. At the back pannel there are the output Speak on audi o

7、 connectors. I t has too a three wi re power mai ns cord to connect the ampli fi er to a properly voltage and current rated mai ns network wi th earth connecti on. Audi o ci rcui t descri pti on The ci rcui t i nput has a balanced (di fferenti al) ampli fi er to reject the common mode noi se added t

8、o the audi o si gnal. Then the si gnal passes through the gai n ampli fi er, subsoni c fi lter and the cli p li mi ter gai n control that i s i nnacti ve unless the ampli fi er wi ll be i n cli ppi ng si tuati on due to ex cesi ve i nput si gnal. Followi ng thi s, the si gnal arri ves to the properl

9、y named power ampli fi er. Thi s ci rcui t i s compri sed by an opamp that provi des the error si gnal to a class A voltage ampli fi er that feeds the common emi tter power ampli fi er. The feedback si gnal from the output i s returned to the opamp that performs the correcti ons necessary to repli c

10、ate at the output the ampli fi ed i nput si gnal. I nsi de the class A voltage ampli fi er i s i nserted a bi as control ci rcui t that provi des a operati ng poi nt to the follo- wi ng power stage and compensates the thermal derati ng of si li con PN juncti ons avoi di ng the thermal runaway proble

11、m. I nsi de the power stage i s i mplemented a current li mi ti ng ci rcui t that avoi d to ex cessi ve power transi stors di si - pati on i n case of shortci rcui t or very low i mpedance loads. The actuati on of thi s ci rcui t li mi ts the output to secure levels. Followi ng the power ampli fi er

12、 ci rcui t there are a zoobel network and a coi l i n seri es that provi des correct ampli fi er performi ng and i ncondi ti onal stabi li ty i n case of ex cesi ve i nducti ve or capaci ti ve loads. The power supply si metri cal rai ls come from the class H conmutati on matri x . Thi s matri x i s

13、composed by mosfet transi stors and di odes and selects the most sui table voltage level to feed the ampli fi er dependi ng of the output si gnal level. Thi s operati ng method leads to a very low power di si pati on i n the power transi stors. The mos- fets i n the conmutati on matri x are commande

14、d by a voltage comparator whi ch output depends of the output si g- nal and the supply rai ls voltage. There i s an on board fan control to regulate the fan speed dependi ng of temperature that i s sensed vi a a ntc thermi stor attached to the heatsi nk . Regardi ng to the protecti on systems there

15、are several block s whi ch compri se: - DC protecti on, vi a a low pass fi lter that detects DC or very low frequency si gnal at the output. - Shortci rcui t protecti on. - Hi gh temperature protecti on, vi a the ntc thermi stor and a comparator wi th a fi x ed absolute reference. - Power on delay,

16、vi a a ti mer that sets the ti me between power on and full operati ve status. - Cli p li mi ter Regardi ng the front pannel i ndi cators, all of them are commanded from the audi o power secti on, provi di ng vi sual i nformati on for fault, ok status, hi gh temperature, cli ppi ng and i nput si gna

17、l ex i stence. GENERAL DESCRIPTION RadioFans.CN 收音机爱 好者资料库 GENERAL DESCRIPTION Power suppl y descri pti on The ampli fi er has a swi tchi ng power supply fully i ndependent and self commanded and protected, to feed the DC voltage to the audi o power secti on. The mai ns voltage passes through an i n

18、terference fi lter to fi lter out both the swi tchi ng noi se to go out and the mai ns i nterference to come i n. Then i s located the mai n fuse and power on swi tch that when closed permi ts the chargi ng of pri mary capaci tors vi a the soft start ci rcui t and the di ode bri dge. After a few sec

19、onds the soft start ci r- cui t i s bypassed and full mai ns voltage i s appli ed to the pri mary si de. From the capaci tors DC voltage an i nverter i mplemented by two power transi stors creates a hi gh frequency square wave that feeds the hi gh frequency trans- former pri mary wi ndi ng. From the

20、 multi ple secondary wi ndi ngs several dc voltages are bui lt vi a the correspon- di ng recti fi ers, i nductances and capaci tors too feed the audi o power secti on. The control of the enti re power supply i s done from a separate board wi th contai ns all the necessary ci rcui try. Thi s ci rcui

21、try i s fed vi a i ts own power supply, fully i ndependent, located i n the same board. I nsi de the board are located the power transi stor dri vers and clock generator for the hi gh frequency si gnal. Besi de, are located too the soft start control and the power supply protecti ons, that are: - Po

22、wer off or mai ns voltage absence detector - Low/hi gh mai ns voltage detector - Ex cessi ve peak or average pri mary current detector vi a a current sensor. - DC output shutdown All these protecti ons act stoppi ng the hi gh frequency osci llati on and restarti ng the system confi guri ng a very fa

23、st acti ng way to protect the power supply. The current detector ci rcui t try fi rst to lower the ampli fi er gai n to reduce the current consumpti on, stoppi ng the osci llati on as a seconday acti on. Also, the audi o secti on can send i nformati on to the power supply to stop the osci llati on,

24、i f you have DC output. TECHNICAL SPECIFICATIONS Techni cal Speci f i cati ons S-1500S-2000S-3000S-4000S-6000S-3004S-4004S-4044S-6004S-6044 Output Power 1kHz, 1.0% THD+N 22x 880 W2x 1190 W 2x 1570 W2x 1950 W 2x 2950 W4x 700 W4x 980 W-4x 1440 W- 42x 575 W2x 790 W2x 1100 W2x 1380 W 2x 2025 W4x 500 W4x

25、 670 W4x 975 W4x 1000 W 4x 1480 W 82x 325 W2x 460 W2x630 W2x 810 W2x 1250 W4x 300 W4x 430 W4x 690 W4x 620 W4x 1015 W Bri dge 41760 W2380 W3140 W3900 W5900 W2x 1400 W 2x 1960 W-2x 2880 W- Bri dge 81150 W1580 W2200 W2760 W4050 W2x 1000 W 2x 1340 W 2x 1950 W 2x 2000 W 2x 2960 W Pink Noise 12dB C.F. 22x

26、 975 W2x 1360 W 2x 2060 W2x 2460 W 2x 4225 W4x 890 W4x 1170 W-4x 2080 W- 42x 610 W2x 880 W 2x 1240 W2x 1600 W 2x 2600 W4x 580 W4x 820 W 4x 1230 W 4x 1280 W 4x 2110 W Frequency Response Power Bandwi dth 0.25dB20Hz-20k Hz Phase Response 1 watt 20Hz-20k Hz15 deg Total Harmoni c Di storti on 20Hz-20k Hz

27、0.05% Intermodul ati on Di storti on SMPTE500 Crosstal k 20Hz-20k Hz75 dB Vol tage Gai n26/32/38 dB Sensi ti vi ty Rated Power 8 (V)2.6/1.3/0.63.0/1.5/0.8 3.6/1.8/0.94.0/2.0/1.0 5.0/2.5/1.3 2.6/1.3/0.6 3.0/1.5/0.8 3.7/1.9/0.93.5/1.8/0.9 5.0/2.5/1.3 Si gnal -to-Noi se Rati o 20Hz-20k Hz112 dB113 dB11

28、5 dB116 dB118dB112dB113dB116dB116dB118dB Requi red AC Mai ns 230 V - 50 Hz (i dle)0.5 A0.5 A0.5 A0.5 A0.5 A0.5 A0.5 A0.5 A0.5 A0.5 A 4 (1/8 rated power)4 A4.8 A6.2 A7.5 A10.5A6 A7.5 A11A10.5A15A Di mensi ons W x H x D (mm)483x 89x 310 W x H x D (i nches)19x 3.5x 12.2 Wei ght Net (Kg- Lbs)8-17.68-17.

29、68.5-18.78.5-18.78.6-18.98.5-18.78.5-18.78.5-18.78.6-18.98.6-18.9 Protecti ons Soft-start, Turn-on Turn-off transi ents, Muti ng at turn-on, Over-heati ng, DC, RF, Short-ci rcui t, Open or mi smatched loads, Overloaded power supply, I CL, PMS, SSP QUICK REPAIR PROCEDURE MAINS CURRENT LIMITER: To tes

30、t the power ampli fi er i t i s advi sable to i mplement a mai ns current li mi ter to avoi d any shortci rcui t, i n case the uni t has damaged parts that have not been fi x ed. The most effecti ve and easy soluti on i s to use a pai r of 100W li ght bulbs arranged i n parallel, and placed i n seri

31、 es wi th the mai ns supply. I f everythi ng i s OK, when you swi tch on the power supply the bulbs wi ll li ght unti l the pri mary capaci tors are fully charged and then they wi ll bri ght softly enabli ng enough current to pass through to reach a normal start up of the supply. POWER SUPPLY: When

32、the swi tchi ng power supply break s, the usual consequences are that both I GBT transi stors (Q2 & Q3) ex plode and that the I R2110S i c (U12) from the control board (the I GBT dri ver) gets damaged. I t may be possi - ble that more i cs from the control board get damaged too (U15 SG3525 or U9 NE5

33、55), but thi s i s not usual. Once an I GBT break s, i t i s absolutely necessary to change the I R2110S i c too, even i f i t seems to be OK. I f the I R2110S i c i s not replaced, the I GBTs wi ll damage agai n. I f you have not the requi ered SMT tools to change any SMD component, the best opti o

34、n i s to change the complete control board. To change the I GBTs follow the nex t steps: tak e out the power supply uni t from the ampli fi er by removi ng the screws at the PCB. Put the power supply PCB upsi de down and unscrew the 4 screws that are on the I GBT heatsi nk , remove both swi tchi ng

35、transi stors by cutti ng thei r legs and clean the pad holes of solder. Screw another pai r of transi stors to the heatsi nk wi th thei r correspondi ng mi ca i nsulators, and place the heatsi nk agai n i nto i ts locati on by fasteni ng the other two screws and solderi ng the transi stors legs to t

36、he PCB. Above mani pulati ons must be done wi th utmost care i n order to have a successful repai r. Check that the transi stor collector i s i nsula- ted from the heatsi nk and that thi s heatsi nk i s located parallel to the other one. Change the control PCB and do a vi sual test of the rest of th

37、e components. Test too the i ntegri ty of secondary recti fi ers usi ng a multi meter i n di ode mode. Test also they are i nsulated from the heatsi nk . (D9, D10, D11, D12, D13, D14, D15 and D16). To test the power supply i t i s advi sable to i mplement a li ttle bench to avoi d any ri sk because

38、of lack of i nsula- ti on from di rect ac mai ns voltage i n most of the ci rcui t. We recommend to use a transformer wi th turns rati o 1:1 to i solate the mai ns from the power supply (remember that the 230 V ac i s sti ll present) but now you are i solated from earth. Connect the power supply thr

39、ough the current li mi ter (bulbs i n seri es wi th the mai ns) and you must look at the control board green led to check that the 15Vdc control board supply i s operati ng and that there i s not any shorted i c. You can measure then the voltages at the output connector, they wi ll be lower than ex

40、pected because the voltage drops at the bulbs. The voltages are the followi ng: S 1500: 49V / 81V S 2000: 49V / 98V S 3000: 65V / 114V S 4000: 65V / 130V S 6000: 54V / 108V / 162V S 3004: 49V / 81V S 4004: 49V / 98V S 4044: 65V / 130V S 6004: 38V / 76V / 115V S 6044: 54V / 108V / 162V When you are s

41、ure that the uni t i s OK, you can short the li ght bulbs wi th the ai d of a swi tch and measure the correct voltages. Bear i n mi nd that i t i s possi ble that one of the audi o power secti on may be damaged. Test there i s no short at the power transi stors. Veri fy also there i s not any ground

42、 track opened. When swi tchi ng the ampli fi er on, measu- re that the voltage at the power audi o secti on emi tter resi stors correspond to the fi rst class H level. Check wi th an osci lloscope, wi th the probe attached to the emi tter resi stors, that when applyi ng si gnal the power supply wi l

43、l change i n steps as ex pected. Test both polari ti es. I t i s hi ghly recommended to test the enti re ampli fi er wi th the li ght bulbs i n seri es wi th the mai ns supply to avoi d further power supply break i ngs. I f the ampli fi er start up correctly then you may short the li ght bulbs and a

44、pply si gnal to obtai n power from the amp. QUICK REPAIR PROCEDURE POWER AUDIO SECTION: When the audi o secti on break s, the usual consequences are that some fi nal transi stor or/and dri ver transi stor gets shortci rcui ted. I t i s possi ble to get also some class h conmutati on mosfet transi st

45、or or di ode shortci rcui ted. To check i t you have to use a multi meter i n di ode mode or resi stance measure. I f the fi nal transi stors are OK you can measure around 10ohms between the base and the emi tter and very hi gh resi stance between collector and emi tter. I n the dri ver transi stor

46、you have to measure around 230ohms between base and emi tter. I f you have a fi nal transi stor shortci rcui ted, you can measure a very low resi stance between collector and emi tter of all fi nal transi stors, but the lower resi stance i ndi cates what i s ex actly the transi stor shortci rcui ted

47、, because thi s has a di rect shortci rcui t and the other paralleled transi stors have arround 0.66ohms (two seri e emi ttter resi stor). Cut the leads of thi s shortci rcui ted transi stors and conti nue testi ng i f you have some more tran- si stor brok en. Also, you may have only the dri ver tra

48、nsi stor shorci rcui ted, then you can measure thi s di rect shorci rcui t bet- ween collector and emi tter of thi s transi stor, and arround 10ohms betweem the collector and emi ter of the all fi nal transi stors. Also i t i s possi ble to have the dri ver and some fi nal transi stor brok en. Cut t

49、he leads of any devi ce brok en and conti nue testi ng unti l you are sure you have not any more devi ce shorci rcui ted. You have to check also the mosfet transi stor and di ode from the class H swi tch. They are placed on the same heatsi nk nearest to the fan. Check you have not a shortci rcui t between the drai n and the source of the mosfet and check the di ode work s correctly. To change any devi ce brok en you have remove the heat si nk s needed to reach i t. Now remove hi s screw and place the new one wi th thermal si li cone. Clean the surface i f needed. Ti