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Post by Michael on Aug 28, 2013 17:32:13 GMT -5
Ok. Bad connection on one of the five. Light came on.red and blue disconnected, light came on and dimmed...
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Post by mastertech on Aug 28, 2013 17:38:45 GMT -5
When you first plug it in the light should come on for at least a second or 2. Check you lamps connections and make sure the bulb is not blown out.
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Post by Michael on Aug 28, 2013 17:40:09 GMT -5
Ok. Bad connection on one of the five. Light came on.red and blue disconnected, light came on and dimmed... [br When I test again with red and blue cut off, the light does not come on anymore. |
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Post by mastertech on Aug 28, 2013 17:40:16 GMT -5
Ok. Bad connection on one of the five. Light came on.red and blue disconnected, light came on and dimmed... Ok, good. Did it dim to almost no light? |
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Post by Michael on Aug 28, 2013 17:42:44 GMT -5
When you first plug it in the light should come on for at least a second or 2. Check you lamps connections and make sure the bulb is not blown out. It did exactly as you said. The bulb is not blown. |
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Post by mastertech on Aug 28, 2013 17:44:24 GMT -5
So this is where we are at now? Red and blue cut, plug in and lamp lights and then goes dim ?
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Post by Michael on Aug 28, 2013 17:44:41 GMT -5
Ok. Bad connection on one of the five. Light came on.red and blue disconnected, light came on and dimmed... Ok, good. Did it dim to almost no light? Yes it did. But it does not come on after I cut off red and blue twisted wires. |
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Post by Michael on Aug 28, 2013 17:47:27 GMT -5
So this is where we are at now? Red and blue cut, plug in and lamp lights and then goes dim ? This is where we are: With red and blue connected, the lamp came on dimmed for 1 or 2 seconds and went off. With red and blue cut off, the light does not come on. |
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Post by mastertech on Aug 28, 2013 17:53:29 GMT -5
Ok. Bad connection on one of the five. Light came on.red and blue disconnected, light came on and dimmed... I thought this is where we were. Reconnect the red and blue and retest with lamp. We have to be absolutely sure of this test. |
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Post by Michael on Aug 28, 2013 17:58:40 GMT -5
Red and blue reconnected, lamp comes on and stays on now.
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Post by Michael on Aug 28, 2013 18:00:29 GMT -5
Red and blue reconnected, lamp comes on and stays on now. [br Red and blue disconnected, light comes on dimmed and then goes off. |
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Post by mastertech on Aug 28, 2013 18:56:00 GMT -5
Ok. Good. Now we know where the problem is. It's on the amp board, probably a blown output transistor.
On that large heatsink you can see all the output transistors. Set your DMM to diode scale and test them 1 at a time looking for 1 or more shorted legs.
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Post by Michael on Aug 28, 2013 19:02:14 GMT -5
Do you mean the large board that is connected to the heat sink? The middle board that black/red/blue wires were connected to? What do the output transistors look like? How many of them? I have to continue tomorrow afternoon. We are on Eastern time here. Please let me know and I will post back the results tomorrow.
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Post by mastertech on Aug 28, 2013 19:25:03 GMT -5
These are the output transistors.  |
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Post by Michael on Aug 28, 2013 22:58:25 GMT -5
Tested the output transistors. Two of the transistors closest to the rear of the unit (Q22A and Q22C) shows that they are short. The copper color screws that attach them to the heat sink are also darker in color. The third one(Q19A) is also discolored but does not show that is shorted. I think it would be safe to replace that as well.
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