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"ODEP" crown macrotech |
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kedwardsleisure 
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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 Posted: 19 September 2022 at 7:52pm |
Thats too high, must be under 10mV and in reality is usually less than 5. |
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Kevin
North Staffordshire |
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Bigbassguy
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Joined: 22 August 2022 Location: Caribbean Status: Offline Points: 6 |
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Posted: 19 September 2022 at 8:04pm |
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Strange enough it dropped to under 10 when warmed up.
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Bigbassguy
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Posted: 19 September 2022 at 8:21pm |
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What's the cause and should it be under 10 at start-up?
How can it be adjusted?
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kedwardsleisure
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 19 September 2022 at 8:34pm |
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it should always be under 10, it's servo controlled, not adjustable. So, there's a fault somewhere. If the ODEP voltages cannot be adjusted (the adjustment is quite sensitive and should only need a touch on the pot, if the pot is hard-over then there's definitely a fault), then a faulty odep circuit itself can cause an offset, because the circuit controls the ultimate output stage drive current.
Make sure the output modules are 100% ok before digging into the control & power boards.Even the little board on the back of the output terminals (MA5000VZ) forms part of the feedback loop as the output is sensed right there. |
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Kevin
North Staffordshire |
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Bigbassguy
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Posted: 19 September 2022 at 9:21pm |
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I've adjusted odep to spec and the protect issue stopped.
The bridge mode not also work but channel A seems to have 12v under ratings. I've tested some FETS removed and the C8187-4 reads well one time and at another time it reads invalid. Discharged them and reads well on and off so I'm guessing the others are playing games also.
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the good Channel (B) reads 34.5Mv