REPAIR SHOP 

 

Repair of Gemini GX 350 Powered speaker

 

 

 

 

Fault - Dead, no output  

 

Removed the active amplifier assembly from the cabinet,  

See the removed crossover assembly showing the 2 output devices under the amplifier main PCB, 1st thing to check is the two output transistors

Removed the PCB with the output devices 

Tested the output devices  2SK1953 2SC5200  found a short circuit on one of the devices, which was expected

Removed both output transistors

 

Fitted matched pair of 2SK1953 2SC5200 transistors, reassembled the amplifier PCB and tested on the work bench - adjusted the bias, all looked ok full output achieved  

 

Reassembled the crossover unit ready for refitting the amplifier assembly

 

Refitted assembly back into the cabinet re connecting cables

 

Tested unit for 4 hours all ok 

 

 

 

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