Ecler-APA1400-pwr-sm维修电路原理图.pdf

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1、 APA1400 APA1000 APA600 SERVICE MANUAL 1 0 2 3 4 5 6 7 8 9 10 1 0 2 3 4 5 6 7 8 9 10 SPCLIPTH PROT SPTH RLEEC APA1400 POWER CHANNEL 2CHANNEL 1 OFF ON SWITCHING POWER MOSFET AMPLIFIER CLIP PROT 1 0 2 3 4 5 6 7 8 9 10 1 0 2 3 4 5 6 7 8 9 10 SPCLIPTH PROT SPTH RLEEC APA1000 POWER CHANNEL 2CHANNEL 1 OFF

2、 ON SWITCHING POWER MOSFET AMPLIFIER CLIP PROT 1 0 2 3 4 5 6 7 8 9 10 1 0 2 3 4 5 6 7 8 9 10 SPCLIP PROT SPTH RLEEC APA600 POWER CHANNEL 2CHANNEL 1 OFF ON SWITCHING POWER MOSFET AMPLIFIER CLIP PROT RadioFans.CN 收音机爱 好者资料库 SERVICE MANUAL APA1400/1000/600 INDEX - BLOCK DIAGRAM - FUNCTIONING DESCRIPTIO

3、N - SCHEMATICS - COMPONENTS LOCATION SCHEMA AND PART LIST - TESTING AND QUALITY CONTROL - TECHNICAL CHARACTERISTICS - WIRING DIAGRAM - CONFIGURATION DIAGRAM - MECHANICAL DIAGRAM - PACKING DIAGRAM RadioFans.CN 收音机爱 好者资料库 author:Queraltdate:000519 approved: num:52.0007version:01.00 FUNCTIONING DESCRIP

4、TION title: POWER MODULE The amplifying stage basic structure is actually the one commonly used until now, this is, a push-pull mounted A-B class amplifier, using P-type (IRFP9240) and N-type (IRFP240) mosfets. The systems controlling core is a NE5534 OpAmp, which is internally compensated in order

5、to obtain an amplifying gain ratio equal or greater than 3. The amplifiers feedback runs through a resistor and a capacitor associated to the OpAmps non- inverting input. Transistors BF871 and BF872 are common-base configured, becoming actually a current source structure. They accomplish a dual func

6、tion: on one hand, they polarise the mosfets gate-source junction, keeping them on their conduction knee. On the other hand, they carry out the OpAmps output voltage variations, referred to signal ground. The polarisation current adjustment is fixed by a 2k5 trimming potentiometer connected to the B

7、F transistors base. This current is added to the current sources output, which passes through the BF-transistors load resistors. The bias current stability against temperature is fixed through the BD437 transistors. Their temperature- dependent base emitter voltage curve is used to alter adequately

8、the current sources reference voltage. As a consequence, if the temperature rises, the reference voltage decreases, thus the gate-source voltage also does, and finally the bias current also decreases. The Zobel network, formed by a resistor-inductor-capacitor group, and which is located at the ampli

9、fiers output, intends to keep the amplifiers load impedance as constant as possible, no matter which load is connected to the stages output, or which signal frequency is to be amplified, in order to prevent an inverted-phase feedback signal. In order to avoid a DC offset on the output signal, a diac

10、-triac tandem system is used, which shorts the output to signal ground when the DC level is enough to get the diac triggered. To prevent this from happening while carrying audio signal (sine-wave, music), the diacs reference voltage is taken from a filter formed by resistor R149 and capacitor C124.

11、The protection circuitry supervises at any time the power consumed by the MOSFETS. The circuitry basically consists on two sections: MOSFETs drain current (Id) monitoring and drain-source voltage (Vds) monitoring. When the drain current exceeds a certain limiting value, a transistor (called control-

12、 transistor) becomes conducting, together with an auxiliary circuitry (helper), formed by a transistor (which is the same type as the control-transistor) and a 82V Zener diode. This value determines the point where the auxillary circuitry starts to run. The helper- transistors base-emitter junction

13、curve is used to obtain a non-linear variation on the MOSFETS gate-source voltage control, and thus on their drain current. ECLER Sheet 1 of 2 author:Queraltdate:000519 approved: num:52.0007version:01.00 FUNCTIONING DESCRIPTION title: POWER MODULE ECLER Moreover, as the helper-transistors base-emitt

14、er current is temperature-dependent, the controlling circuitry (basically the control-transistor) compensates the safe operation area (SOA) drift due to temperature. If the MOSFETs drain-source voltage (Vds) drops too low, a second circuitry actuates to alter thecontrol-transistors triggering level,

15、 obtaining a SOA-like curve section and a current stage, which can be adjusted adequately in order to maintain the MOSFETs power consumption as close as possible to its SOA. Moreover, the amplifier also includes an ANTICLIP system. When the amplifier reaches its clipping level, the OpAmp becomes una

16、ble to keep the system under control, and as a consequence V peaks appear at its output (15V power supply). This peaks are used to be rectified and sent to an optocupler (led- resistor) which modifies its impedance as a function of those peaks amplitude. The resulting impedance is part of a voltage

17、divider, together with the amplifiers input impedance. So, as the optocoupler increases its impedance, the amplifiers input signal level decreases until the system becomes stable. Also a dual-function temperature control circuitry is provided: - Temperature-depending control of the cooling fan speed

18、, whose voltage supply is variable between 7 and 14 Vac. - Amplifier shutdown when temperature exceeds approximately 90C. The circuitry is formed byLM35D-type IC, which acts like a thermal probe, an amplifier, thermal probe level comparator and a 7805-type voltage regulator. The amplifier is respons

19、ible for the cooling fan speed control. The comparator triggers a relay, which cuts off the MOSFETs bias current by shunting a 22W resistance to the BF-type transistors load resistors. This way, the output signal of the amplifier is effectively cutted off. The STAND-BY circuit. This circuit keeps th

20、e safety relay closed for about 10 seconds, thus the MOSFETs bias current is cutted off during this period, until the whole system reaches again a voltage-stable situation. Due to this, hearing annoying transients and noises during start up through the loudspeakers is avoided. This delay is obtained

21、 by a RC-cell, where R=287K, and C=47F/50V. During start up, this RC-cells voltage smoothly rises until the 40106-type Trigger-Schmitt trigging level is reached, and the amplifier starts functioning. C=47F resets or discharges when the unit is turned off. During a short period of time, a BC817-type

22、transistor acts like a switch, connecting two 75W parallel resistors to C=47/50V. Sheet 2 of 2 author:Queraltdate:020430 approved: num:40.0048version:01.01 C101100nFCXCN41000 C102100nFCXCN41000 C103100nFCXCN41000 C104100nFCXCN41000 C10547u/16FCCE100000 C10647u/16FCCE100000 C10747u/16FCCE100000 C1084

23、7u/16FCCE100000 C109100pFCXCN21000 C110100pFCXCN21000 C111100pFCXCN21000 C112100pFCXCN21000 C11322p 2%FCXCN12201 C11422p 2%FCXCN12201 C11522p 2%FCXCN12201 C11622p 2%FCXCN12201 C11747u/16FCCE100000 C11847u/16FCCE100000 C11947u/16FCCE100000 C120C100n/63VFCCDK11000 C12247u/16FCCE100000 C123100nFCXCN410

24、00 C124100nFCXCN41000 C1253300u/35FCCE213300 C1262200u/35VFCCE212200 C1274700u/100FCCE331525 C1284700u/100FCCE331525 C1294700u/100FCCE331525 C1304700u/100FCCE331525 C13147u/50FCCE250470 C13247u/50FCCE250470 C1334700u/100FCCE331525 C1344700u/100FCCE331525 C13518nFCXCN40180 C13618nFCXCN40180 C137180nF

25、CXCN41800 C138180nFCXCN41800 C13918nFCXCN40180 C14018nFCXCN40180 D101BAS28FCXDDBAS28 D103BAS28FCXDDBAS28 D105BAS28FCXDDBAS28 D107BAS28FCXDDBAS28 D108B250C1000FCREC25100 D109FB3506FCREC35060 D110BAS16FCXDDBAS16 D1111N4007FCXDD40070 D1121N4007FCXDD40070 D113BAS16FCXDDBAS16 F101 FOR 230VT10AFCFUS60100

26、F101 FOR 115VT16AFCFUS60400 HS100HEAT SINKFCRAD11515 REFERENCEVALUECODEREFERENCEVALUECODE PARTS LIST PRINTED CIRCUIT 11.0774-01.04PRINTED CIRCUIT 11.0774-01.04 model: EP03-99C all screws should be on their place, correctly tight and unmarked. Check out the units general presentation. BURNING (BURN-I

27、N) TEST Leave the tested unit connected to its correspondent voltage mains socket, applying input signal and connecting load impedances, and working at 3dB under its maximum output power level for at least 24 hours. VERIFICATION USING MUSIC Verify the units sound quality, which should be distortion-

28、 and noise-free. Also check that all potentiometers can run smoothly their whole sweep, without annoying noises and crisperings. At their minimum position, check that output signal is completely cutted off. To ensure that all electrical junctions are well-fixed, hit the tested unit against your work

29、ing table, obviously without damaging its outer presentation. Verify also all inputs and outputs. At last, short-circuit the output terminals while carrying amplified signal, and verify that once short-circuit is removed, the amplifying stages still are working. Sheet 3 of 3 author:Queraltdate:00051

30、9 approved: num:51.0027version:01.01 VERIFICATION PROCESS title: APA POWER AMPLIFIERS PRELIMINAR: - Set the MONO-STEREO switch to STEREO. - Check the GROUND-LINK switch. - Place a mini-jumper at connector J123s terminals (power supply). - Select the subsonic filter switch to OFF. - Verify that the c

31、orrect cables and connections are used. - Connect the units mains power cable to a variac output, and leave it on the 0V output voltage position. - Keep an ammeter prepared to verify the units current demand. VERIFICATION - Turn on the unit without any load connected to its outputs by setting the ma

32、in power switch to its ON position. Increase slowly the variacs output voltage until it reaches its maximum value, which is 230Vac. At this point, verify that the units bias current demand keeps its factory adjusted value and, if not, proceed to readjust this parameter. After this, fix the adjustmen

33、t devices with sealing lacquer. Also check that the Power On led is lit. - Replace the ammeter by the corresponding fuse. Warning! The power supply will be charged! Note: to discharge the power supply, apply a 0dB 2KHz input signal to the unit and turn its mains voltage down to 0V by reducing the va

34、riacs output voltage. - Turn off the unit and afterwards on again in order to verify the time it remains in STAND-BY mode, which should last approximately 10 seconds. Also verify that when the unit is turned on, the cooling fans run up until their maximum speed. - Verify both XLR and JACK input term

35、inals, also check the attenuation values by sweeping their potentiometers between -v and 0dB. Verify the amplifiers output power while connected to the mains power supply: - APA1400 635W 51V on 4 - APA1000 440W 42V on 4 - APA600 275W 33V on 4 - Verify the ANTICLIP system is functioning correctly by

36、increasing the input signal level up to values higher than 0dB. The output signal should be smoothly clipped. Verify that if a mini-jumper is placed at the test terminals (which are located near the VTL5C8 package), the ANTICLIP system switches on earlier, making the clipped signal appear even more

37、smoothened. Check that the front panel CLIP leds are lit, and observe that, when the input signal is damped 1 or 2 dB, the CLIP indicator leds turn off. Do not retire the mini-jumper. - While applying a 05V input signal, verify the units frequency response bandwith, which should be linear between 20

38、Hz and 20KHz. The output signal should appear ECLER Sheet 1 of 3 author:Queraltdate:000519 approved: num:51.0027version:01.01 VERIFICATION PROCESS title: APA POWER AMPLIFIERS ECLER distortion- and noise-free. Verify that even if the input signal frequency rises up to 50KHz, the output signal level o

39、nly decreases 1 or 2 dB, but no distortion is noticed. - Verify the MONO operation mode. Apply a 1KHz 05V input signal and set the MONO STEREO selection switch to the MONO position. The output signals should now appear inphaseoppositiononereferredtotheother,andonlytheChannel1input potentiometer is r

40、esponding. Connect an 8 load impedance to the units actual active output terminals of both outputs and verify that the anticlip system switches on easily when needed. Set the amplifier back to the STEREO operation mode. - Connect an output load impedance formed by a 4 resistor shunted to a 2F capaci

41、tor, and apply a 1KHz square waveform input signal. Monitor the output signal through an oscilloscope, and increase the input signal level until the output starts clipping. On the flat sections of the sandcastle output waveform, only two or three little ringings should be detected. - To verify the s

42、ubsonic filter, apply a 20Hz input signal. When the subsonic filter is active, the output signal should decrease 6.5dB referred to the non-active filter output level. - Verify the THERMAL protection. When the thermal probe 1 and 2 leads are shorted, check that the relay opens, the THERMAL indicator

43、led lights on, the output signal is cutted off and the cooling fan increases its speed up to the maximum running speed. PROTECTIONS - Turn off the signal generator. Select a 1KHz output signal, set the amplitude range to 1V but leave the amplitude control knob down to its minimum position. - Connect

44、 a 05 ohm load impedance to the amplifiers output. - Turn on the signal generator, and slowly increase the amplifiers input signal amplitude, while watching that the units output voltage does not exceed its limiting value, depending on the type under test, as listed below: FIRST STAGE SECOND STAGE -

45、 APA1400 13Vpp (240V) 22Vpp (215V) - APA1000 20Vpp (235V) 25Vpp (210V) - APA600 15Vpp (240V) 18Vpp (210V) Note: the clipping signal should appear distortion- and ringing-free. The different stages are obtained by varying the amplifiers mains voltage through the variacs output. Sheet 2 of 3 author:Qu

46、eraltdate:000519 approved: num:51.0027version:01.01 VERIFICATION PROCESS title: APA POWER AMPLIFIERS ECLER QUALITY CONTROL All mechanical parts should be visually revised, in order to detect scratches on the units painting; all screws should be on their place, correctly tight and unmarked. Check out

47、 the units general presentation. BURNING (BURN-IN) TEST Leave the tested unit connected to its correspondent voltage mains socket, applying input signal and connecting load impedances, and working at 3dB under its maximum output power level for at least 24 hours. VERIFICATION USING MUSIC Verify the

48、units sound quality, which should be distortion- and noise-free. Also check that all potentiometers can run smoothly their whole sweep, without annoying noises and crisperings. At their minimum position, check that output signal is completely cutted off. To ensure that all electrical junctions are w

49、ell-fixed, hit the tested unit against your working table, obviously without damaging its outer presentation. Verify also all inputs and outputs. At last, short-circuit the output terminals while carrying amplified signal, and verify that once short-circuit is removed, the amplifying stages still are working. Sheet 3 of 3 author:J.Colominesdate:010627 num:53.0009version:01.02 635 WRMS 395 WRMS 1270 WRMS 590 WRMS 370 WRMS 1180 WRMS 2Kw 7Hz-50kHz 25Hz/Butt./18