Mackie_M800_Service_Manual电路图.pdf

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1、M800 FR series power amplifier SERVICE MANUAL 1999,2000 MACKIE DESIGNS, INC. 820-215-00 ON OFF POWER PROFESSIONAL POWER AMPLIFIERFULL SYMMETRY DUAL DIFFERENTIAL HIGH CURRENT DESIGN OL 3 6 9 20 3 6 9 20 OL CH 1 28 26 24 18 2016 2214 12 6 00 1.23v (+4dBu)SENSITIVITY GAIN/dB 1.23v (+4dBu)SENSITIVITY GA

2、IN/dBCH 2 NORMHOT SIG CH STATUS 1&2 3v 2v 1v 28 26 24 18 2016 2214 12 6 00 3v 2v 1v CH 1 1CHANNEL CH 2 SPEAKER OUTPUTS + + MONOBRIDGE BAL/UNBAL MONO BRIDGE OFF ONOFF ONOFF ON 120 VAC 60 Hz 1500 WATTS CONSTANT DIRECTIVITY HORN EQ/AIR EQ LOW CUT FILTER 170 HzOFF 4.5k Hz 6k Hz2k Hz AIR EQ 100 Hz STAGE

3、MONITOR TYPICAL 35 Hz TYPICALTYPICALTYPICALTYPICAL STEREO (MONO BRIDGE) 800 WATTS 4 OHM LOAD MIN. 400 WATTS CH 2 OHMS LOAD MIN. THRU LOW CUT FILTER INPUTINPUT THRU 170 HzOFF 4.5k Hz 6k Hz2k Hz AIR EQ TYPICAL 35 Hz CONSTANT DIRECTIVITY HORN EQ/AIR EQ CHANNEL2 BAL/UNBAL AMP MODELIMITER SERIAL NUMBERMA

4、NUFACTURING DATE RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. CAUTION AVIS: RISQUE DE CHOC ELECTRIQUE NE PAS O

5、UVRIR THE FOLLOWING ARE TRADEMARKS/REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: MACKIE , FR SERIES , & THE RUNNING MAN FIGURE CONCEIVED, DESIGNED, AND MANUFACTURED BY MACKIE DESIGNS INC WOODINVILLE WA 98072 USA MADE IN USA PATENTS PENDING COPYRIGHT 1999 100 Hz STAGE MONITOR RadioFans.CN 收音机爱 好者资料库 P

6、age 3 is interactive 2 SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY EXPERIENCED REPAIR TECHNICIANS ONLY RadioFans.CN 收音机爱 好者资料库 3 CONTENTS Introduction . 3 Block diagram . 4 Specifications. 5 Connectors. 7 Troubleshooting tips. 8 Safety test . 9 Bias and test procedure. 10 Circuit theory . 11 Qui

7、ck parts . 15 Parts. A-1 Fold-out Sections Heatsink subassembly assembly . B1 Assembly instructions . C1 Schematics and PCB layouts Main board . 212-1 Display board. 218-1 INTRODUCTION This manual contains basic service information. It is essential that you have a copy of the users manual as this co

8、ntains the complete operating instructions. SERVICE TECHNICAL ASSISTANCE Mackie Designs, Service Technical Assistance, is available 8AM - 5PM PST, Monday through Friday for Authorized Mackie Service Centers, at 1-800-258-6883. Feel free to call with any questions and speak with a carefully-calibrate

9、d technician. If one is not available, leave a detailed message and a qualified Mackoid will return your call asap. DISCLAIMER The information contained in this manual is proprietary to Mackie Designs, Inc. The entire manual is protected under copyright and may not be reproduced by any means without

10、 express written permission from Mackie Designs, Inc. SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY EXPERIENCED REPAIR TECHNICIANS ONLY RadioFans.CN 收音机爱 好者资料库 Click on an item to open that page 4 Block Diagram CH 1 BALANCED LINE INPUT (TRS) CH 1 BALANCED LINE INPUT (XLR-F) LIMITER LIMITER ONOFF O

11、N OFF LIMITER SWITCH LIMITER DETECTION LIMITER DETECTION ON OFF LOW CUT FILTER FREQ CD EQ FREQ ON OFF LOW CUT FILTER FREQ CD EQ FREQ CH 1 GAIN STEREO MONO BRIDGE STEREO MONO BRIDGE STEREO MONO BRIDGE CH 2 GAIN INVERTING UNITY GAIN AMPLIFIER DC OFFSET PROTECT METER DRIVE AMP AMP 64VDC +64VDC +74VDC 7

12、4VDC 64VDC +64VDC +74VDC 74VDC OL 3 6 9 20 METER DRIVE OL 3 6 9 20 MUTE MUTE THRU (XLR-M) CH 2 BALANCED LINE INPUT (TRS) CH 2 BALANCED LINE INPUT (XLR-F) THRU (XLR-M) MUTE HOT LED NORM LED TEMP SENSOR (ON HEATSINK) MUTE CONTROL 4 SEC DELAY (TURN-ON) CH 1 AMP OUT CH 2 AMP OUT PROGRAM DETECT AND OR 60

13、C DETECTOR FAN SPEED CONTROL HI DCV LO DCV 80C MUTE 55C UNMUTE FAN TO HUSKY STADIUM CH 1 SPEAKER OUT CH 2 SPEAKER OUT + 64 VDC + 74 VDC TOROIDAL POWER TRANSFORMER LAMP FUSE POWER SWITCH MUTE THERMAL PROTECT DC OFFSET PROTECT 5 Specifications Maximum Power, mid band: 175 watts per channel into 8 275

14、watts per channel into 4 400 watts per channel into 2 550 watts into 8 bridged 800 watts into 4 bridged Note: Power ratings are specified at 120VAC line voltages. The M800 power amplifier draws large amounts of current from the AC line with continuous sine wave testing. Accurate measurement of power

15、 requires a steady and stable AC supply. This means the line impedance must be very low to insure that the peak AC line voltage does not sag to less than 97% of its value. If driving highly reactive loads, we recommend that the limiter circuit be engaged. Continuous sine wave average output power, b

16、oth channels driven: 150 watts per channel into 8 from 40Hz to 20kHz, with no more than 0.025 % THD 225 watts per channel into 4 from 40Hz to 20kHz, with no more than 0.05 % THD 280 watts per channel into 2 from 40Hz to 20kHz, with no more than 0.1 % THD Bridged mono operation: 450 watts into 8 from

17、 40Hz to 20kHz, with no more than 0.05 % THD 560 watts into 4 ohms from 40Hz to 20kHz, with no more than 0.1% THD Power Bandwidth: 20Hz to 70kHz (+0, 3 dB) Frequency Response: 20Hz to 40kHz (+0, 1 dB) 10Hz to 70kHz (+0, 3 dB) Distortion: SMPTE IMD, TIM (250mW to rated power) 0.025% 8 0.05% 4 104 dB

18、below rated power, 4 Channel Separation: 70 dB 1kHz Damping Factor: 250 400Hz Input Impedance: 20k balanced bridging Input Sensitivity: 1.23 volts (+4 dBu) for rated power into 4 Voltage Gain: 28.0 dB Maximum Input Level: 9.75 volts (+22 dBu) Rise Time: 40V/s 80V/s bridged Current Slew Rate 20A/s at

19、 2 CMRR: 40 dB, 20Hz to 20kHz Load Angle: 8(jx) time independent at 8 4(jx) time dependent, T 6 min. at 4 2(1jx) time dependent, T 2 min. at 2 Transient Recovery: 1s for 20 dB overdrive 1kHz High Frequency Overload and Latching: No latch up at any frequency or level. High Frequency Stability: Uncond

20、itionally stable driving any reactive or capacitive load. Turn On Delay: 3-4 seconds Variable Low-Cut Filter: 10Hz (Off) to 170Hz, 2nd Order Bessel Constant Directivity High Frequency Boost: 2kHz to 5.5kHz (+3 dB points) 6 dB/octave high-frequency shelving filter, (shelving occurs at approximately 3

21、0kHz) Limiter Section: Complementary Positive and Negative Peak Detecting Indicators: 5 meter LEDs per channel 20, 9, 6, 3, OL (Overload) TEMP STATUS NORMAL/HOT LEDs continued. 6 AveragePeak CurrentCurrent Amplifier LoadingRequiredRequired 2 per side or 4 bridged7 A16 A 4 per side or 8 bridged4.5 A1

22、1 A 8 per side or 16 bridged3 A6.5 A Power Consumption: 55 wattsat idle 400 wattswith musical pro- gram fully loaded (4 per side, or 8 bridged) 600 wattswith musical pro- gram fully loaded (2 per side, or 4 bridged) 550 wattsat rated power into 8 (continuous sine wave) 950 wattsat rated power into 4

23、 (continuous sine wave) 1500 wattsat rated power into 2 (continuous sine wave) AC Drop-out Voltage: At approximately 65% of rated line voltage Physical: Height3.5 inches (89mm) Width19.0 inches (483mm) Depth15.25 inches (387mm) Overall Depth 16.25 inches (413mm) Weight28 pounds (12.7kg) Disclaimer S

24、ince we are always striving to make our products better by incor- porating new and improved materials, components, and manu- facturing methods, we reserve the right to change these specifica- tions at any time without notice. Owners manual addendum NOTE: The specifications are from the owners manual

25、 ad- dendum, and not from the initial release of the owners manual. Since the owners manual was produced, there have been a few other changes as follows: Bridge Mode The amplifier can accept inputs from Channel 1 and from Channel 2. If you do this, the two inputs will be summed and the result sent t

26、o the Bridge Mono output. Only Chan- nel 1s gain pot will control the overall volume. However, you must adjust the CD-EQ and Low-Cut Filter correctly on each input used. The Meters The meters indicate the power level referenced to the clipping point of the amplifier, not to the rated power. AC Power

27、 Considerations The amplifier will continue to operate down to 65% of the rated line voltage, and will mute if the line drops lower than this. The table below shows the average and peak current draw from a 120VAC line for various speaker loads. For ex- ample, if you are running the amplifier in ster

28、eo using 2 speakers, the average current draw from the 120VAC line is 7 amps. specifications continued. 7 Connectors MAIN BOARD J34 2-16V 4 6SEND(2) 8RTN(2) 10+64V 12 14 1 3 5 7 9 11 13AMP-OUT(2) +16V SEND(1) AMP-IN (1) OVERTEMP AMP-OUT(1) BIAS T.P. FAN J7 BIAS T.P. TRANSFORMER SECONDARIES R51 BIAS

29、ADJUST J4 J10 J13 J16 J14 FUSE F1 J15 J18 J17 J34 Display board J2 J3 J9J8 J1 J6 J5 8 Troubleshooting tips - output failures After a catastrophic failure, it is likely that the main supply fuse will be blown. Replace the fuse and very slowly bring up the Variac while monitoring line consumption. It

30、is likely that substantial line current will be pulled due to shorted output parts. Remove the main board from the unit and check for shorted output transistors. If one bad output transistor is found, replace all six in the channel. When an output device shorts it can place high current stresses on

31、the other output parts. These output parts can fail over time. Since long term reliability is paramount, please replace all the outputs. All six of the 5W 0.51 emitter resistors must be verified for proper value. Any off-tolerance, or open parts, need to be replaced. An off tolerance (higher resista

32、nce) emitter resistor will prevent its related output transistor from “doing its share” and will place more stress on its mates in the output section. Also verify the 6 base drive resistors (2.2, 1/4W, fusible) are all OK. Verify that the drivers and pre-drivers are not shorted. If one driver is sho

33、rted, replace its mate. Do the same with the pre-drivers. Also check all the resistors surrounding the drivers and pre-drivers. Note: if you change any fusible resistors, you must use identical replacement parts. Check the VI limiters and detectors. It is not uncommon to damage these parts when the

34、amplifier fails in a spectacular way! Look for shorts on Q32, Q35, Q36 and Q39. Verify proper value on the resistors that go to the bases of these devices. It is critical that these sections are working correctly. Shorted transistors can cause some odd asymmetrical clipping problems. Open parts will

35、 not allow the current limiting to operate effectively. If problems exist in these sections the amplifier might fail into a short, or might clip prematurely when loaded to 2. All of the above trouble shooting (not including part replacement) takes perhaps 15 to 20 minutes to do. If you take the time

36、, and do all that is indicated above, it will allow 99% of the amplifiers to come up the first time! Trying to hurry, and skipping what is suggested, can lead to a frustrating and time consuming repair. Slowly bring up the supply and verify that line consumption isnt excessive and that the output is

37、 centered (no DC offset). It might be desirable to defeat the amplifier muting (connect U4-14 & 12 together) temporarily so the amplifiers are active even when the supplies are still very low. If the amp stays centered, verify that it will pass a nice clean sine wave. Remove any test jumpers, and pr

38、oceed to the safety test and the “bias and test procedure” section on the next pages. 9 You must perform the following leakage test before returning the unit to your customer. Take every safety precaution to protect yourself while doing this test. 1.Make a small loading RC circuit as shown in the di

39、agram below, and connect the AC volt meter between the AC power source ground and any exposed metal on the unit under test. 2.Connect the unit under test to an AC power source using a ground-lift adaptor, leaving the units safety ground floating. Turn the unit on. 3.The meter reading should be less

40、than 750mVAC (note: this is equivalent to 0.5mA of leakage current). 4.Flip the plug over in the receptical so the hot and neutral are swapped. Verify that the reading is still less then 750mVAC. 5.If either reading is greater than 750mVAC, then you must investigate and repair the unit before return

41、ing it to your customer. Safety test 10 Bias and test procedure After the unit has been repaired, the following should be done to assure long term reliable operation. If a distortion analyzer is present, distortion specifications should be verified. 1.Adjusts bias in both channels (R51 & R60) for 30

42、mV +/- 2mV at bias test points (J5 & J6) after unit has idled for a few minutes. With Full AC line voltage applied to unit, it will pull around 55W from the line (700mA at 120V). Measure for DC offset on both output connectors. DC offset should be less than +/- 50mV. 2.Apply a 1KHz sine wave to the

43、inputs and verify that the unloaded outputs have a waveform that is symmetrical and undistorted. Drive the outputs into clipping and verify symmetrical “flat-topping” on the waveform. 3.Reduce output levels, install the 0.1uF capacitor jumper from the output to ground connections, and verify that cl

44、ipping behavior is proper. Verify that no high frequency oscillation occurs near and at clipping (parasitic oscillation). 4.Remove capacitive loading and minimize sine output. Verify and re-adjust bias if required. Note that the bias will not drift appreciably in a unit that is functioning properly.

45、 5.Connect the amplifier directly to the AC line and connect an 8 dummy load to both channels. Bring sine wave level up on both channels and verify symmetrical clipping. The output will clip somewhere between 90V - 110V pk/pk depending on how stiff the line is. Clipping should be as described above.

46、 Add the 0.1uF capacitive loading and verify clipping is still well behaved. 6.Individually load Channel 1 and Channel 2 with 2. Clipping should be symmetrical, well behaved , and occur somewhere around 60V - 80V pk/pk. Verify that clipping is well behaved after adding the 0.1uF capacitive loading. My boss told me that I should include a picture of “well behaved,” so here is a picture of my boy Joe. I hope this clears up any misunderstanding. 7.Remove loading and