Mesa/Boogie Mark 1 Maintenance And Repair Information
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Also See for Mark 1:
- Owner's manual (54 pages) ,
- Operating instructions manual (24 pages) ,
- Owner operating instructions (11 pages)
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Summary of Contents for Mesa/Boogie Mark 1
- Page 1 MARK I Maintenance and repair information.
- Page 2 Malfunctions can be cured easily when a proper diagnosis of the fault is made. Usually only one part (most often a tube) is all that has gone bad, and the Boogie has been designed and constructed to make any maintenance simple and straight forward. Following is an outline covering just about any possible problem which might occur with suggestions on how to proceed in determining what is wrong and curing it.
- Page 3 A bad Fetron can be the cause of scratchiness in guitar volume control. Usually you can only get a replacement Fetron from us. We use a special type and we select and install load resistors to fine tune each Fetron. If you ever do need a replacement, notify us. Installing a new Fetron with its particular resistors should take anyone with any soldering skills only 10 minutes or so and is not difficult.
- Page 4 • Check diodes. A blown rectifier diode will cause low voltage at the STANDBY switch (should be 450-465). Test each diode in circuit (power off) with an ohm meter. Resistance reading in one direction should be much greater than reading with meter leads reversed. Use heat sinks whenever soldering is done to diodes.
- Page 5 • Speaker and reverb cables are long enough to allow chassis to sit on top of cabinet to make work and testing easy. • Any problem you or your technician are unable to solve may be referred to MESA/Boogie for assistance over the telephone.
- Page 6 GRAPHIC EQUALIZER PROBLEMS •Are rare indeed. • Check switch-lug action on footswitch jack inside chassis, it should provide a ground connection to the filter circuit with nothing plugged in. • Check for 52 volt Bias across 50 mf. cap. • Check transistors. Q4 is NPN, others are PNP. A blown transistor will upset bias voltage to 6L6's as the equalizer circuit uses the same supply.