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Old 15th October 2009, 07:12 PM   #11
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Quote:
Originally Posted by marko View Post
the white/blue connectors that carry signal seam to loose earth continuity (thin black wires inside brown cables) from the daughter board there on to the main board, those big resisitors do seam to be fine.
Well, that might be it. You can pull the crimped connectors out of their shells and inspect the wire itself, and using needle-nosed pliers, you can kinda 'smash' the crimped connector to make it a tighter fit, or, you may want to consider just soldering the wires directly to both of the boards. You should not even need to take the main-board off of the sink. The connector receptacles should just pull right up.
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Old 15th October 2009, 07:28 PM   #12
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Quote:
Originally Posted by Perry Babin View Post

Ipods cause more problems (due to a lack of a common ground) than any other signal source, that's why I suspected that you were using one.
I have problems with hum with ipods.
There is no problem if earthed equipment is connected.

So I have a switched earth between zero volts and earth now so I can add or disconnect the earth depending on what is connected.
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Old 15th October 2009, 07:45 PM   #13
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Quote:
Originally Posted by TO-3 View Post
Well, that might be it. You can pull the crimped connectors out of their shells and inspect the wire itself, and using needle-nosed pliers, you can kinda 'smash' the crimped connector to make it a tighter fit, or, you may want to consider just soldering the wires directly to both of the boards. You should not even need to take the main-board off of the sink. The connector receptacles should just pull right up.
that doesn't make sense to me, i have rca sheild right up to duaghter board and with mm set to continuity i loose continuity somewhere in the board..

so wouldn't that point to something on the daughter board?
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Old 15th October 2009, 08:05 PM   #14
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If this amp uses some sort of balanced/ground-isolating input, there may be no DC connection to the primary or secondary ground.
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Old 16th October 2009, 06:24 PM   #15
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Quote:
Originally Posted by marko View Post
that doesn't make sense to me, i have rca sheild right up to duaghter board and with mm set to continuity i loose continuity somewhere in the board..

so wouldn't that point to something on the daughter board?
The RCA's are not on the daughter board, correct? I could not see them in the picture that you posted. As Perry asked, earlier, could you post a pic of the other side, as well?

As far as a ground path, the only components that may be in series will be a resistor and possibly a capacitor(in parallel with the resistor). This resistor helps to 'isolate' the grounds by isolating the switching noise from the power supply. So, there should be no other interruptions(ie. IC's or transistors, etc...) in the ground path, other than by the wires connecting to the DB. You may need to pull the board out of the chassis to verify that there are no burnt traces on the bottom of the board.
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Old 16th October 2009, 06:37 PM   #16
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pics as requested, i've gone over most of the soldering just incase there was a bad joint but no luck yet!

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 16th October 2009, 07:01 PM   #17
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That certainly helps out! I don't see anything glaringly wrong with the DB. Maybe you can follow the ground traces from the RCA's to where they come into the board. It is possible that there is a small break in a trace???? Not sure, but I think the problem emanates from the main board. Most likely in the main amp or driver stage. Any other results?
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Old 16th October 2009, 07:17 PM   #18
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What are the 2 dark spots (bottom view of board) next to the center pins of the audio connectors? Scrape it away to make sure the trace isn't open.
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Old 16th October 2009, 07:18 PM   #19
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i've been working from the rca's back to the board, maybe i should work from the other end and see what happens!

where the signal connects to the main board should i have resistance there to the negative terminal like i should at the rca shield?

i will get this sorted this weekend!!!
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Old 16th October 2009, 07:21 PM   #20
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Originally Posted by Perry Babin View Post
What are the 2 dark spots (bottom view of board) next to the center pins of the audio connectors? Scrape it away to make sure the trace isn't open.

that's black marker pen i put on there for referance so i knew which were earth points at a glance
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