Question about Kicker ZR600 Car Audio Amplifier
It sounds like it could be biasing. Measure the DC voltage across the emitter resistors. If it's more than 0.001volts (1mV), reduce it to 1mV. The output transistors MUST be clamped to the sink when setting the bias current. Recheck the biasing after ~5 minutes of idling. The bias transistors (Q7, Q27) need to be in contact with the heatsink.
These amplifiers also have a problem with the shield ground fuse opening. This can lead to oscillation which can mimic biasing problems. You would need to use an oscilloscope to see the oscillation. You can check the shield ground. Disconnect the RCAs from the amp and measure the resistance from the shield of the RCA jacks to the center tap on the secondary side of the transformer. It should be ~0 ohms.
Posted on Dec 01, 2007
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