Question about Mackie SWA1801 Subwoofer
I have the schematic from Mackie and it shows that i am supposed to have 18V at the rectifier D40. I noticed that at the transformer (Coil) I am only getting 5V from the secondary. It is a dual winding coil and the other winding has an output of 22V which feeds another rectifier D1. I also noticed that at the start-up board where the coil plugs into, there is a relay involved that does not energize. According to the diagram, 18V is required at the coil of the relay to energize. Does the relay energize when 18V is received from rectifier D40 or does the relay have to be energized before anything happens...can anyone help???
Help please looking for a schematic for my sub ,as it's blown both fuses ,suspect further damage mackie 1801
email to email@example.com (thanks). regards Rich.
Posted on Apr 11, 2011
My transistor tip 122 is crossed and my fuse 1 is blown out. i need a diagram of mackie swa1801.
Posted on Mar 05, 2012
Hi, I have no power on my Mackie swa1801 Can you zend me that schematic please? De_Wijns@hotmail.com THX Thomas
Posted on Oct 30, 2011
I have one with a different problem, Get me a me a circuit diagram and I will tell you in 5 min what your problem is.
Posted on Nov 18, 2010
Please help, can you send me schematic firstname.lastname@example.org
Posted on May 13, 2010
Check The 20 watt 22 ohm risistor on the ac input board
Posted on Jul 11, 2009
Can I get a copy of that schematic?? I am also troubleshooting the same problem. I have found in two other occasions that the large power resistor has blown along with the poweramp. They are supposed to blow OPEN but in the case of the two i have worked on they burn to a high resistance. I only had 5 VAC going to primary of the large toroidal input coil. Maybe your problem maybe not. I have also needed to replace transistors TIP122, MJE15033 and MJE15033 and 2sc5200's(both) on the outputs.
-Brian C. Miller
Posted on Oct 29, 2008
I think you will find that the relay is energised by the primary AC, which then passes the secondary outputs to the amplifier section. This is to protect the circuits in the event of the input supply falling below required level, which would otherwise result in wrong current loading and component failure.
Posted on Jun 10, 2008
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