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Chip Amps Amplifiers based on integrated circuits

Mackie Powered speaker problem
Mackie Powered speaker problem
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Old 14th December 2011, 05:18 PM   #1
argonrepublic is offline argonrepublic  Canada
diyAudio Member
Join Date: Apr 2005
Location: Simcoe Ont
Default Mackie Powered speaker problem

I have a problem with Mackie SRM 350V2 powered speaker
We used it last week in Christmas parade. It stopped played and power LED flashes now.
I left in in my garage for a few days. I brought it in and while cold it turned on.
I tried a couple of other times and it just flashes.

I managed to get it to play yesterday. Here is what I have found:

1)At low level, it will play for 30 seconds max. If I turn it up at all, it shuts down immediately.

2)With from power indicator disconnected, amp doesn't power up at all.

3)With no input and gain all the way down, I attempted to check +/-15VDC. When I put black probe on ground, pwer light began to flash. When I put second probe on the clearly marked +15VDC terminal light came on and stayed on. that seemed odd because black probe only was connected. I tried a small screwdriver on the same terminal and got same results. I also toughed screwdriver on -15VDC terminal and light began blinking.
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Old 15th December 2011, 07:01 PM   #2
pacificblue is offline pacificblue  Germany
diyAudio Member
Join Date: May 2008
Check the fuses.

Ask Mackie for a service manual. They usually give you one, if you state the serial no. of the product.
If you've always done it like that, then it's probably wrong. (Henry Ford)
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Old 15th December 2011, 08:29 PM   #3
! is offline !  United States
diyAudio Member
Join Date: Jun 2005
Location: Midwest
I suspect a stress fracture of either the PCB, a solder joint, or a component body. Temperature change or pressure points may temporarily complete (or break) the circuit. When/while it is not coming on, probe around gently to see where the circuit is broken.
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Old 15th December 2011, 10:44 PM   #4
argonrepublic is offline argonrepublic  Canada
diyAudio Member
Join Date: Apr 2005
Location: Simcoe Ont
Thanks very much! Silly me! I recently work on a synthesizer that would play a note just by touching a terminal on the key sensing circuit until I replaced a resistor network. You were right. I insulated my skin and touched around the board and was able to locate a dry joint on leg of a transformer.
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