SRS Labs manual SR560 Offset Adjustment Procedure, Battery Replacement, Fuse Replacement

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CALIBRATION AND REPAIR

SR560 OFFSET ADJUSTMENT PROCEDURE

Required equipment: Digital volt meter Oscilloscope

4 BNC cables

1 BNC tee Function generator Small slotted screwdriver Phillips screwdriver

Remove the bottom cover of SR560 to expose the component side of pc board.

1.Turn off the SR560. Hold down the "Reset" button, and turn the unit back on (this sets the unit back to the default settings).

2.Using a Digital Volt Meter, adjust the front panel offset pot (located between "A'' and "B" input BNC's on front panel) to read zero volts between pin 14 of U407 and ground (output BNC shield). Do not use the chassis as ground.

There are 4 potentiometers located on the bottom right side of the pc board (Viewed from the component side, with front panel facing forward). These are:

P101 = low gain CMRR adjust

P102 = high gain CMRR adjust

P103 = high gain offset adjust

P104 = low gain offset adjust

3.Set the SR560 coupling to "GND", and the gain = 50,000.

4.Connect the oscilloscope to the 50 Ohm output on the SR560.

5.Adjust P103 for zero volts on the 50 ohm output, using the oscilloscope.

6.Set the SR560 gain = 1000 and Source to "A-B''.

7.Set the function generator to square wave, Freq = 1 KHz, amplitude = 500mV pp.

8.Using a BNC tee, and 3 BNC cables, put the square wave into channels A and B.

9.Set the SR560 coupling to "DC".

10.Adjust P102 to null the square wave on the oscilloscope.

11.Set the coupling to "GND" and gain = 50,000

12.Readjust P103 for zero volts on the oscilloscope.

13.Set SR560 gain = 50 and coupling to "DC".

14.Set the oscilloscope to AC coupling.

15.Using the digital volt meter, measure the voltage from pin 6 of U105 to ground (output BNC shield).

16.Adjust P104 for zero volts on the meter.

17.Adjust P101 to null the square wave on the oscilloscope.

You might have to readjust P104 and P101 several times. The end result should be zero volts on pin 6 of U105, with the smallest amplitude square wave that you can achieve on the oscilloscope.

BATTERY REPLACEMENT

After three to five years or about 1000 charge/discharge cycles, the sealed lead- acid batteries degrade. When the battery operation time shortens, or if the unit stays very warm for more than a day after it is plugged into the line, the batteries may require replacement.

The three batteries are a standard size which are available from several different distributors. All are 12 VDC with a charge capacity of about 2.0 Amp-hours, and measure 7.02" X 1.33" X 2.38". Two of the batteries are wired in parallel to provide the high current required for the positive supply. When replacing the batteries, take care to observe the polarities!

FUSE REPLACEMENT

There are three fuses on the back panel of the instrument. The fuse located inside the power entry module will blow if the unit draws excessive line current. Replace this fuse with the value indicated for your line voltage.

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Contents Model SR560 Page Table of Contents Appendix a PCB SR560 Revision F 9/89 SchematicsCalibration and Repair Appendix BIntroduction and Setup Instrument OverviewPreparation for USE Use in Biomedical Applications Accessories FurnishedRepackaging for Shipment Environmental ConditionsPage Specifications SR560 LOW-NOISE Preamplifier Specifications ChartSpecifications Front Panel Operating Summary PowerOperation and Controls SourceFilters Gain Gain ModeReset OutputBattery Charger AC Power InputAmplifier Power Output Rear Panel Operating SummaryBlanking Input Battery Care and UsageBattery Care RS-232 InterfaceAvoid Deep Discharge Differential LOW-NOISE Front END Configurable Filters and GainCircuit Description Output StagesOverload Detection Battery Charger and PRE-REGULATORSMicroprocessor Power Regulators Rear Panel InterfacesBatteries and P.E.M Front PanelCalibration and Repair Offset AdjustmentFront END Replacement CalibrationBattery Replacement SR560 Offset Adjustment ProcedureFuse Replacement Noise Contours Input Voltage Noise Dynamic ReserveMaximum Calibration and Repair Remote Programming CommandsAppendix a IntroductionAppendix a Intrinsic Noise Sources Appendix BNoise Sources and Cures Non-Essential Noise SourcesCapacitive Coupling Inductive CouplingMicrophonics Resistive Coupling or ‘Ground Loops’Thermocouple Effect Appendix B SR560 Component Parts List Front Panel Parts ListMain Board Parts List 22U MIN 01U Axial 804 00225-548 Insl MTP5N05 SR560 Component Parts List SR560 Component Parts List PIN Mach SR566 Assy Adhes Tape Miscellaneous Parts List SR560 Component Parts List

SR560 specifications

SRS Labs SR560 is a cutting-edge audio enhancement technology that has gained recognition for its ability to deliver an immersive sound experience. Built upon years of research, the SR560 utilizes proprietary algorithms to achieve high-fidelity sound output while maintaining an incredibly dynamic range.

One of the most notable features of the SR560 is its adaptive audio processing, which adjusts sound dynamics based on the content being played. This means that whether one is listening to music, watching a movie, or playing video games, the sound quality is optimized in real-time to provide the best listening experience. The SR560 excels at enhancing dialogue clarity in films, ensuring that important audio elements are never lost amidst background sounds.

Another key characteristic of the SR560 is its support for multi-channel audio. With the rise of surround sound systems, the SR560 is designed to integrate seamlessly with 5.1 and 7.1 speaker setups. This ensures that users can enjoy a true surround sound experience, where each audio channel is processed independently to create a lifelike auditory environment. The SR560’s processing capabilities allow it to convert standard stereo audio into multi-channel output, enriching the listening experience for any audio format.

SRS Labs has equipped the SR560 with advanced bass optimization technology. This feature enhances low-frequency sound, providing deep, rich bass without distortion. Whether it’s the thumping beats of music or the rumble of action-packed movies, the SR560 ensures that users can experience the full spectrum of audio without compromising on quality.

Furthermore, the SR560 showcases state-of-the-art sound management features that provide users with customizable audio profiles. This allows users to tailor their audio experience according to personal preferences, whether they prefer a more balanced sound, enhanced bass, or boosted treble frequencies. The intuitive interface ensures that adjustments can be made effortlessly.

In conclusion, the SRS Labs SR560 stands out as a versatile audio enhancement technology that caters to the needs of various audio consumers. By combining adaptive processing, multi-channel support, bass optimization, and customizable profiles, the SR560 ensures a rich and immersive audio experience. As the demand for high-quality sound continues to rise, the SR560 is poised to remain a significant player in the evolution of audio technology.
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