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Junior Varsity
What to look for in a bad active DI?
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<blockquote data-quote="John Roberts" data-source="post: 101187" data-attributes="member: 126"><p>Re: What to look for in a bad active DI?</p><p></p><p></p><p>I can't give you a complete technical education in 25 words, but I will try to point you in the right direction. </p><p></p><p>#1- does it have power... You can start with VOM in volts scale... check battery, should be 8V or more. Is power getting to the opamp when turned on? If it's a single opamp +V is typically pin 7 (second from top on right side looking at it from the top). Opamp -V pin 4 (bottom pin on left side) will be connected to ground 0V. If working properly most other opamp pins will measure roughly 1/2 the battery voltage. </p><p></p><p>#2- is signal getting into the circuit.. Plug an an input that is making a quasi constant sound (like a radio) that you can measure on the VOM in AC scale and follow it into the circuitry. </p><p></p><p>#3 if it getting in, trace it to the output. </p><p></p><p> Of course it is harder than this... For the fried unit the toasted parts need to be replaced and any burnt traces will need to be patched. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 101187, member: 126"] Re: What to look for in a bad active DI? I can't give you a complete technical education in 25 words, but I will try to point you in the right direction. #1- does it have power... You can start with VOM in volts scale... check battery, should be 8V or more. Is power getting to the opamp when turned on? If it's a single opamp +V is typically pin 7 (second from top on right side looking at it from the top). Opamp -V pin 4 (bottom pin on left side) will be connected to ground 0V. If working properly most other opamp pins will measure roughly 1/2 the battery voltage. #2- is signal getting into the circuit.. Plug an an input that is making a quasi constant sound (like a radio) that you can measure on the VOM in AC scale and follow it into the circuitry. #3 if it getting in, trace it to the output. Of course it is harder than this... For the fried unit the toasted parts need to be replaced and any burnt traces will need to be patched. JR [/QUOTE]
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What to look for in a bad active DI?
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