The service was quick and simple, finding the service manual easy and it appears to be the original with colour schematics. It contained the info I was after and so sorted the problem.
I have copied it to CD and attached the envelope to the inside back cover of the owners manual. Good manual and excelent service. Robin Wood, Wood Electronics, New Zealand.
MACKIE HR824 26 pages English-only Service Manual contains:
1) HR824 technical overview with the description of front and rear panel switches.
2) HR824 specs
3) Block Diagram
4) Wiring Diagram
5) Packaging management
6) Spare part & final assembly list (for PCB rev A and B) + exploded view
7) Test Procedures (where, how to measure voltage...) including Test Point diagram on the PCB.
8) IC and Transistor charts.
Excellent guide: very clear, good scan quality enabling us to print readable diagram :-)
Note:
Mackie HR824 make extensive use of surface mount devices (SMD). Service on the HR824 must
only be undertaken by experienced service technicians with the right tools, experience and patience to perform surface mount rework when needed.
Text excerpt from page 35 (click to view)
SA-PMX3DBEB
8.19.1. Assembly of the Transistor (Q5103)
8.20. Replacement of Transistor (Q5100)
� Follow the (Step 1) - (Step 5) of Item 8.3 � Follow the (Step 1) - (Step 7) of Item 8.9 � Follow the (Step 1) - (Step 7) of Item 8.12 � Follow the (Step 1) - (Step 2) of Item 8.16
Step 1 : Fix the Transistor (Q5103) to the Heat Sink. Step 2 : Screw 1 screw at Transistor (Q5103) in the direction of arrows. Step 1 : Desolder pins of Transistor (Q5100) on reverse side of Power P.C.B..
Step 3 : Solder pins of the Transistor (Q5103) on the reverse side of the Power P.C.B.. Caution : Ensure pins of the Transistor (Q5103) are properly seated and soldered on reverse side of Power P.C.B. Step 2 : Remove 1 screw from the Transistor (Q5100) in the direction of arrows. Step 3 : Remove the Transistor (Q5100) from the Heat Sink. Caution : Handle the Heat Sink unit with caution due to its high temperature after prolonged use. Touching it may lead to injuries.
