How to fix low output level using speaker level inputs on Klipsch SW12-I?
If you experience a low output level when using speaker level inputs on your Klipsch Amplifier, first check the inputs for correct polarity from the source. Also, check R79 and R80 which should read 91K, check U13, and ensure proper signal flow using the schematic.
Why does my Klipsch Amplifier blow a fuse with nothing connected?
If your Klipsch Amplifier blows a fuse even when nothing is connected to the output, you should: * Check the output transistors on the power board and replace any that are shorted. * Check the driver transistors on the filter/driver board and replace any that are shorted. * Check U7 and U9 for shorts. * Check the bridge rectifier in the power supply circuit. * Check the transformer. * Check the filter capacitors C21, C22, C23, C24, C44, C45, C46, and C47. * Check for pinched wires going to and coming from the transformer.
What to do if my Klipsch Amplifier quits working after a short period?
If your Klipsch Amplifier stops working after a short time, it may be due to excessive heat on the heat sink, which indicates a bad output device or a bad thermal switch. You should also check the output relay (RLY1) and U11 and U12.
Why does my Klipsch SW12-I Amplifier have excessive hum?
Excessive hum in your Klipsch Amplifier can be addressed by checking all ground connections and all filter capacitors, including C21, C22, C23, C24, C44, C45, C46, and C47.
What to do if Klipsch SW12-I is causing popping sound?
If your Klipsch Amplifier is making a popping sound: 1. Connect the amplifier output to a 16 ohm load. 2. Apply a 60mVrms 30Hz signal to one RCA jack. The voltage across the load should be between 32.1 Vrms and 34 Vrms for SW12, or between 29.1 Vrms and 30 Vrms for SW15. For the THX amp, apply a 3Vrms 70Hz signal to one RCA jack. The voltage across the load should be between 35.1 Vrms and 36 Vrms. If the voltage was too high, re-align the amplifier per procedure. If the signal was clipped, re-adjust the amplifier per alignment procedure.
Identifies the subwoofer amplifier models covered by the manual.
Detailed technical specifications for the SW12-I subwoofer amplifier.
Detailed technical specifications for the SW15-I subwoofer amplifier.
Describes the various input and output connection types and their functions.
Explains the signal conditioning, filtering, and phase adjustment stages.
Details the compression circuit's function and components.
Overview of the driver circuit's role and adjustments.
Description of the amplifier's high-power output stage.
Explains the power supply design and voltage regulation.
Describes the circuit for controlling the output relay for protection and delayed activation.
Lists necessary test equipment and setup requirements for alignment.
Step-by-step instructions for performing the alignment on the SW12-I.
Lists necessary test equipment and setup requirements for alignment.
Step-by-step instructions for performing the alignment on the SW15-I.
Diagnosing and resolving issues where the fuse blows with no output.
Steps to troubleshoot low output when using speaker level inputs.
Troubleshooting steps for issues causing popping sounds in the amplifier.
Procedures to identify and fix excessive hum in the audio output.
Diagnosing and fixing intermittent shutdown issues of the amplifier.
Lists resistors from R1 to R77 with their values for the SW12-I.
Lists capacitors C1 to C35 with their values for the SW12-I.
Lists capacitors C36 to C56 with their values for the SW12-I.
Lists integrated circuits U1 to U6 and their part numbers for the SW12-I.
Lists transistors Q1 to Q28 and their part numbers for the SW12-I.
Lists other components like fuses, relays, and transformers for the SW12-I.
Lists resistors from R1 to R77 with their values for the SW15-I.
Lists capacitors C1 to C35 with their values for the SW15-I.
Lists capacitors C36 to C56 with their values for the SW15-I.
Lists integrated circuits U1 to U12 and their part numbers for the SW15-I.
Lists transistors Q1 to Q28 and their part numbers for the SW15-I.
Lists other components like fuses, relays, and transformers for the SW15-I.
Schematic detailing input, summing, buffer, and filter circuits.
Schematic of the driver circuit and the output relay control logic.
Schematic of the power amplifier output stage and power supply regulation.
Schematic detailing input, summing, buffer, and filter circuits.
Schematic of the driver circuit and the output relay control logic.
Schematic of the power amplifier output stage and power supply regulation.
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