Troubleshooting Guide - Classe Audio CA-100-101 Service Manual

Troubleshooting Guide

Symptom
Unit won't turn on
Smoked and/or burned
components
Blown fuses
No output
Unit turn into protection
Excessive buzz and/or hum
Oscillation
Intermittent signal
PRO-SVR_LEGACY
Check connections;
Check fuses;
Check soft-start circuit;
Check relays;
Check power supply circuits (positive rail, negative rail, Mosfet
supply).
Check for short between components and ground;
Check output transistors;
Check output relays;
Check power supply circuits (positive rail, negative rail, Mosfet
supply).
Check for short between fuse and ground;
Check power supply circuits (positive rail, negative rail, Mosfet
supply).
Check connexions;
Check output relays;
Check power supply circuits (positive rail, negative rail, Mosfet
supply);
Check output transistors.
Check for smoked and/or burned components;
Check power supply circuits (positive rail, negative rail, Mosfet
supply);
Check source and load;
Check protection circuit;
Check sensor wires between sensor PCB and control PCB;
Check outputs transistors and Mosfet drivers.
Check electrical lines;
Check for a ground loop in the system.
Check source;
Check capacitors on main board;
Check 4.7 resistor.
Check connections;
Replace shield wires.
Possible cause
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