I was having a hard time finding the problem with this Mackie 1604 unit. I didn't have a schematic. Went looking on the web and found your site and the price was more then reasonable. Ordered it and within the hour had the manual and within 15 minutes had the unit fixed. Best $4.99 I ever spent. Thank you.
Text excerpt from page 102 (click to view)
PRODUCT SAFETY NOTE: Components marked with a and shaded have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don t degrade the safety of the receiver through improper servicing.
CIRCUIT SCHEMATIC DIAGRAM
SURROUND 1/4 DP17 Only
All DC voltage to be measured with a tester (100k /V). Voltage taken on a complex color bar signal including a standard color bar signal. Since this is a basic circuit diagram, the value of the parts is subject to be altered for improvement.