How to Repair Klipsch R-112SW Subwoofer: Troubleshooting Tips in Czech and English

Welcome to my quick guide on how to repair the Klipsch R-112SW subwoofer and similar models R-110SW, R-115SW. In this video, I will show you how to diagnose and fix common issues. I cover basic voltage checks, how to address auto turn-on problems, and what to do if you hear popping sounds every 2-3 seconds. Additionally, I discuss a specific issue I encountered with random, irregular tapping or banging sounds and how to fix it. This video is presented in both Czech and English for your convenience.

Timestamps:
- Introduction
- Checking Basic Voltages
- Auto Turn-On Problem Fix
- Fixing Popping Sounds
- Diagnosing and Fixing Random Sounds

Components Mentioned:
- 4.7k Resistor
- IRS2092 Chip
- 22uF 50V Capacitor
- TL074C Operational Amplifiers
- SMD Resistors (R08 and R11)
- Electrolytic Capacitors
For a detailed list of components and additional guides, please check the links below.

Welcome to our quick guide for repairing the Klipsch R-112SW subwoofer and similar models. We will show you how to diagnose and fix common issues.
Checking Basic Voltages:
The first step is to check the basic voltages. We should measure 5V on the two-wire connector, +15V and -15V on the four-wire connector, and -57V and +V57 on the three-wire connector (only 42V or 62V on similar models). The large resistor should have -8V and -45V against GND."

Auto Turn-On Problem Fix:
If your amplifier turns on and then off by itself, try connecting a 4.7k resistor between pin 1 of Q7 and ground. This stabilizes the 5V supply for the auto turn-on circuit.

Fixing Popping Sounds:
If you hear a pop every 2-3 seconds, measure the voltage on the large resistor near TIP31C. If it fluctuates significantly with each pop sound, the problem may be with the IRS2092 chip. Replace this PWM chip and the 22uF 50V capacitor to the right of it."

Comprehensive Repair Guide:
"For a complete repair, you may need additional components: all electrolytic capacitors, damaged SMD resistors such as R08 and R11, and more. A detailed list of electrolytic capacitors can be found in the link below. You don't need 'audio grade' capacitors. Standard capacitors from reputable brands are sufficient.

Diagnosing and Fixing Random Sounds:
Another issue I diagnosed was that the subwoofer was quiet and suddenly started making random, irregular sounds similar to tapping or banging on a table, almost as if it was haunted. I will insert a recording here where I tried to capture these sounds. However, the microphone could not capture the lowest frequencies.
The fix involved resoldering the contacts of both TL074C operational amplifiers, where there were visually undetectable cold joints.