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Old 10th November 2012, 05:32 AM   #51
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Quote:
Originally Posted by Perry Babin View Post
I didn't look at the entire circuit previously.

Look at the DC voltage on transistors Q3, 4 and 5 on the PS driver board. Those should tell you why the relay isn't engaging.
I have rail-rail oscillation on one terminal of each inductor and audio on the other terminal of each inductor.

Not sure if I can get to all the test points on the transistors you want me to check but I will try, its very tight in there alot in the way.

What are Q3, Q4, and Q5 and whats there purpose?
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Old 10th November 2012, 06:36 PM   #52
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Old 12th November 2012, 11:52 PM   #53
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Perry could you post a pic of the PS driver board I noticed mine has a missing resistor want to see if it was omitted or its missing??
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Old 13th November 2012, 05:20 AM   #54
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See attached.
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Old 13th November 2012, 06:31 AM   #55
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Just want to confirm you need the voltages from Q3, Q4, Q5

It seems you would need Q6 or no??
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Old 13th November 2012, 06:40 AM   #56
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These transistors are marked BR and the only thing I have found is MSB1218A is this correct? They are 45 volt pnp or is there another part number?? Just trying to make sure when I give you the readings I use the right pin configuration the MSB1218A is the same as a 3904 and 3906.
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Old 13th November 2012, 07:09 AM   #57
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2SC2412
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Old 13th November 2012, 07:09 AM   #58
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Q3 2SB1269

C: .960 vdc
B: .003 vdc
E: .488 vdc

Q4 MSB1218A

C: 14.12 vdc
B: .924 vdc
E: .546 vdc

Q5 MSB1218A

C: 14.13 vdc
B: .544 vdc
E: .026 vdc

Q6 MSB1218A

C: 4.95 vdc
B: .083 vdc
E: .058 vdc

C3 47uf 16v aluminum cap

+ .917 vdc
- .005 vdc

I think its obvious that C3 is not charging up and turning on Q4 and Q5 to connect the relay ground as you stated. So thats why the audio is not being connected to the speaker terminals.

You also stated that C3 is charged through R5, so if C3 is not charging R5 could be open or defective??
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Old 13th November 2012, 07:18 AM   #59
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R5 could be defective. Q3 or C3 could be leaky. They would have to be removed to test them.
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Old 13th November 2012, 07:21 AM   #60
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Q3 is brand new and was replaced along with Q2, Q7, and Q8

C3 or R5 is what I must check, sucks cause I will have to remove the driver board again which means removing the main board.
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