Klipsch-RSW15-pwr-sm 维修电路原理图.pdf
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1、KLIPSCH, INC. SERVICE MANUAL Subwoofer Amplifier Model: RSW-15 RadioFans.CN 收音机爱 好者资料库Klipsch Amplifier Service Manual KSAMM-017 Page 1 CAUTION! Lethal voltages are present and exposed when cover is off of amplifier. Only qualified service technicians should attempt to repair this product. ? ? TABLE
2、 OF CONTENTS RadioFans.CN 收音机爱 好者资料库Klipsch Amplifier Service Manual KSAMM-017 Page 2 SPECIFICATIONS .3 Model: RSW-15 .3 THEORY OF OPERATION .4 INPUTS.4 SIGNAL CONDITIONING .4 OUTPUT.4 POWER SUPPLY.4 OTHER FEATURES.5 PARTS LISTS.6 SCHEMATIC DIAGRAMS.13 Klipsch Amplifier Service Manual KSAMM-017 Page
3、 3 SPECIFICATIONS Model: RSW-15 Rated Power Output 650 Watts Continuous into 6 Maximum Power Output 2400 Watts(peak) into 6 Frequency Band-width 35 - 110Hz THD 1.0% 1 Watt 0.5% Rated Power 10.0% Maximum Power Signal to Noise 90dB or better 60 Hz Hum 15 minutes Low Pass Variable 40 - 120Hz with 24dB/
4、Octave Slope Klipsch Amplifier Service Manual KSAMM-017 Page 4 THEORY OF OPERATION RSW-15 Amplifier INPUTS This amplifier utilizes two RCA connectors(L & R) for LINE LEVEL signal input. A second set of RCA connectors are connected directly to the inputs to provide a non-filtered LINE output. This is
5、 for passing a full range signal to a second subwoofer, power amplifier, etc. SIGNAL CONDITIONING All pre-amplification, filtering, and signal conditioning is accomplished using dual op-amp device U2 and quad op-amp devices U1, and U3. Op-amp U1A, and U3C are gain stages that performs the necessary
6、buffering and isolation of the input signals. The input signal/s from Line In are fed to summing amp U1A. From there the signal passes through the fixed Low Pass filter U1B, the variable Low Pass filter U1C, and Notch filter U2A. In this amplifier U2A is not actively used as a notch filter and is op
7、erated as a unity gain buffer amp stage. The LFE Mode switch S1 selects either the filtered signal or a signal that has bypassed the LowPass and Notch filters. From there the signal passes through U3A which is the Level Control stage. Following U3A the signal goes to High Pass filter U3B which has a
8、 slope of approximately 12dB/octave below 20Hz. Stage U3C is a buffer/driver stage which also acts as a selectable phase inverter via the Polarity switch S3. From here the signal is sent to the power output section of the amplifier. OUTPUT The Power Amplifier(PA) section of this amplifier is a balan
9、ced bridge design. Signal splitter stages U301B and U301C feed pre-amps U301A and U301D which in turn feed the signal to driver stages Q303, Q304, and Q308, Q309. The signal is then applies to the power output MOSFETs Q306, Q307, Q308, and Q310, Q311, Q312. The maximum output capability of the ampli
10、fier is determined primarily by the output transistor type, and the DC rail voltage/current supplied by the power supply. The value of feedback resistors R314and R330 determine the sensitivity of the PA section. Trimmer pots RP301 and RP302 establish the DC offsets. POWER SUPPLY The RSW-12 utilizes
11、a high current switching power supply with proprietary output controller circuitry. This controller circuitry tracks the input signal and continually adjusts the rail voltages to what is needed at the time. This creates a high efficiency amplifier since very little current is flowing when not needed
12、. The power supply also supplies a highly regulated +/- 10Vdc for the op-amps. LIMITERS This amplifier contains several limiting circuits for the purpose of controlling the signal so as not to drive the speakers beyond their physical limits. Op-amp stage U5A along with components C107 and R78 form a
13、n overall limiter which limits the output to the speakers to the rated power level. U5B and U5C form a Tracking Limiter which monitors the power supply capacity. the tracking limiter does a hard limit of the signal when it detects that the demands on the power supply are exceeding its capability. Th
14、e Frequency Dependent Limiter consists of low-pass filters U3D & U4B, and inverter stage U4C. This circuit limits the power output only below a specific frequency. In the RSW-12 this frequency is approximately 23Hz. The Clip Detect circuit U5D is not used. Klipsch Amplifier Service Manual KSAMM-017
15、Page 5 OTHER FEATURES AUTO ON/OFF This amplifier features an automatic on/off circuit that allows the user to set up once and forget it. With the power switch in the “AUTO” position, a switching circuit consisting of U1D, U4A, & U4D, senses an input signal. From this switching circuit, JFET Q301 on
16、the power amp board is biased OFF which removes the grounding of the signal. For the protection of the speaker when the amplifier is first plugged in, there is a short delay before JFET Q1 is biased OFF. The sensing circuit will bias Q301 ON after the input signal is absent for approximately 15 minu
17、tes or more which shorts the signal path to ground. With the power switch in the “ON” position the signal sensing circuit is bypassed and Q301 is always turned OFF. A bi-color LED indicates the status of the amplifier at any given time. The LED will be GREEN when the control circuit is activated and
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