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Old 21st December 2010, 12:25 AM   #11
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Location: Louisiana
DC voltage on Q1 and Q2. Use the pin numbering scheme in the attached image.
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Old 21st December 2010, 01:31 AM   #12
kmil is offline kmil  United States
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Default Q1, Q2 Voltages

Q1:
1) 4.8
2) 4.8
3) 4.4

Q2:
1)4.8
2) 5.3
3) 12

A little hard to see/find, but, hopefully some telling results.
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Old 21st December 2010, 01:44 AM   #13
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The emitters of eaach of those should be at 0v. It appears that you have an open/bad ground. Are W114 and W122 marked on the board? Both are jumper wires on the top of the board.

If so, what is the DC voltage on them?
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Old 21st December 2010, 12:05 PM   #14
kmil is offline kmil  United States
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Default W114 qnd W122 voltages

W114 and W122 are marked on the board. Both are 4.27 volt at both ends.

Also, I went back and re-checked all my values with a new 12V supply battery.

Q3: 1) 12.2 2) 3.1 3) 11.6

D4: p-con side) 11.56 other) 4.88

Q1: 1) 4.3 2) 4.3 3) 4.87
Q2: 1) 4.3 2) 4.9 3) 11.25

IC1
1) 0 2) .05 3) .05 4) .1 5) .7 6) 1 7) 0 8) 3.1
9) .07 10) 2.6 11) 3.1 12) 3.1 13) 2.2 14) 2.2 15) 2.2 16) 0
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Old 21st December 2010, 12:30 PM   #15
kmil is offline kmil  United States
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After doing some more inspection, I've found a problem. There is either a broken trace or missing component at one end of W17. I have marked it's location with an arrow in the attached pic. It looks to me like something was there, but, I couldn't find anything on the schematics.

Sorry my inexperience is showing through.



[IMG]file:///C:/DOCUME%7E1/Kyle/LOCALS%7E1/Temp/moz-screenshot.png[/IMG][IMG]file:///C:/DOCUME%7E1/Kyle/LOCALS%7E1/Temp/moz-screenshot-1.png[/IMG]
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Old 21st December 2010, 02:07 PM   #16
kmil is offline kmil  United States
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After checking and re-checking the schematics, I concluded that it was only a broken trace. I re-flowed the trace and like magic....the amp powered on. I'll have to do some final testing later, but, I think we got it going.

Big thanks to Perry and Blakktalon for their expert assistance.

I now have another amp to start troubleshooting. This one I'll be able to take more time reading and learning on my own.
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