Logitech Z-5500 Schematic Diagram

Finding a complete, official schematic for the Logitech Z-5500 Go to product viewer dialog for this item.

No Power:

Frequently caused by a blown fuse on the back of the subwoofer or a failure in the 14.5V AC secondary winding of the toroidal transformer.

Main Amp Rails

Most Z-5500 issues stem from specific areas you can trace with a multimeter: ⚡ Power Supply Rails : Approximately ±36V DC for the TDA chips. logitech z-5500 schematic diagram

Symptoms:

Satellite speakers work, but the sub is quiet or hums. What the schematic tells you: The subwoofer channel has its own discrete amplifier circuit with large rail capacitors (often 35v 4700uF). The Fix: Check the schematic for the "Sub Pre-amp" section. Replace the TL074 or JRC4558 op-amp. Also, inspect the 5W cement resistors—they crack open frequently.

Bypass Info:

If your control pod is dead, the amp can be triggered by tying pin 7 to 5V on the D-Sub connector. Finding a complete, official schematic for the Logitech

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Common Failure Points:

The control pod's LCD backlight and the power button are frequent fail points. Overheating of the LM217 voltage regulator is also common, often caused by faulty resistors on its ADJ pin. Symptoms: Satellite speakers work, but the sub is

Fuse Issues

: If the system is completely dead, check the main fuse located on the back of the subwoofer near the power switch.