Thanks for the info and simulation data. I will have a look at pin 2 and check.
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I actually switched focus to the 2nd unit which has the same E304 error and low output on channel 1. I checked the output of the transducer board and it measured the same as channel 2 (which does work). I then measured the output of the hybrid amplifier and it was much lower when compared to channel 2.?
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So it looks like that has a hybrid amplifier problem. Which is odd because E304 relates to the output of the transducer board. Output of the hybrid amplifier should trigger a different fault code ?
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Anyway, I tried swapping the hybrid over from the first unit... and I got no output at all then, same fault as the first unit. Swapped the hybrids back over again and got the low output fault back.?
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So I can only conclude at this point that both hybrid amplifiers are faulty. One with no output, and one with very low output.?
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I wondered if the one with no output is somehow shutting down the output of the transducer board. Some sort of protection kicking in because the symptoms transfer across when I swap the hybrids over.
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There is a UPA102G on the hybrid. It MIGHT be worth swapping this with another one.??
