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Samson MDR8 blowing internal power supply fuses. Is there a wiring schematic of the power supply board available

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Here is a troubleshooting hint:

Put an incandescent lamp in series with the hot side of the power cord. This acts as a resetable fuse while troubleshooting so you don't blow fuses.

Schematics are hard to come by, but power supplies are easy to trace the circuitry.

Check filter caps and the diodes and THEN look for hot (temp) IC's and transistors.

Posted on Mar 17, 2010

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My 16 channel Yamaha mixer board will not power on as if power switch is messed up I'm wondering if there is an easy fix


It depends. If if has an external power supply, you can try a different supply of the same rating. Beyond that, it may be a blown fuse, which may be internal on the power supply board, or as you say perhaps a broken power switch. Whether it's easy or not will depend on your diagnostic skills, how much you know about electronic repairs, and your availability of parts.
Generally, i suggest people take their repairs to professionals as poking around inside electronic gear can cause more damage, both to the gear and to themselves.

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1 Answer

I need a transformer for my resolv 65a monitor


Are you an experienced tech? In most cases (unless there is a defect in manufacturing) transformers are not a common cause for failure. If it blows the fuse disconnect the secondaries and see if it still blows the fuse. If it does then the transformer is likely the cause, if the fuse doesn't blow then the problem is elsewhere. If you have 120vac at the primary and nothing(or very low) at the secondary(s) then the transformer could also be at fault. If you have done this already and narrowed it down to the transformer, sorry I cannot help. I used service Samson but no longer am able to get parts. Good luck!

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1 Answer

Model Yamaha ME-50 no power


John
With AC power off.
Use a meter (on Ohms scale) to check internal fuse for blown (open) fuse.
If you feel qualified & safe with AC Power On.
Check input to internal power supply on AC Scale (Caution when AC is on) for volts in.
Use meter on internal Power Supply for "probably" DC volts leaving internal Power Supply electronics to power the rest of the electronic circuits.
Switch mode power supplies can break down. They stop doing their high frequency switching so they don't convert AC to DC.
If this P/Sup is a separate box or circuit board, inside the unit, then it can have a part number & be replaced.
Good Luck

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1 Answer

Txm20 samson ... unit wouldnt turn on... where is the fuse ?


if its not right next to where the AC power plugs in, or part of the power plug itself ( lil notch in cable recepticle that will allow it to slide out ) then it would have to be inside the mixer on the power pcb. ( the board the power cable connector is soldered to)

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1 Answer

I recently purchased an Orange AD5 amp. It came to me dead so the store I bought it from told me to try to change the fuses for this amp is becoming rare and hard to get. I replaced both fuses with the...


Check for burned components, broken wires or cracked insulation on wires. Inspect the tube sockets and circuit boards for carbon tracks. Next, check the power supply rectifiers for shorts.

If you don't find anything, pull out all of the tubes (be sure to document where each tube goes!) and see if the fuses still blow. If they don't, one of the tubes has an internal short. (If the fuses blew only after warm-up, it would be an overload on a tube rather than a short through the tube.)

If this was a solid-state amplifier, I'd suggest checking the audio output driver transistors - this is the most common fuse-blowing failure in those.

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2 Answers

Hi im in Argentina and i accidentally pluged in my amp without an adapter now it doesnt work what needs to be fixd?


The power supply is blown. Argentina is 220V I believe. I have never seen a power supply schematic for this however being that it is low power it is a linear supply not switching. Either the rectifier diodes are blown out or possibly the output capacitors are blow due to approx double voltage. If you try this yourself be careful otherwise get a new amp. Good Luck

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1 Answer

Vlz 16 blowing fuses


This is a serious problem. If you spilled liquid into the unit, expect serious internal damage.

DO NOT keep replacing fuses as you may be creating further damage.

Best scenario is if the input to the power supply has shorted diodes or capacitors. Worst is that part of the circuit board has been burned.

Taking it to a shop or having electronic skills and opening the unit up to troubleshoot are the options.

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2 Answers

I have a Casio PX-310 on the service bench . I


As you probably know the regulator also supplies power to the other ICs on the board. If the fuse keeps blowing that means that one of the parts drawing power is shorted. By looking the pin configuration up for each IC you can find which one is the + and which one is the- etc. The faulty IC will be showing voltages on the other pins where they shouldn't be. That is usually the defective part. You will also want to check parts that are related to or in the same circuit. The worse case scenario is that the main IC is shorted. Without the schematic its a long arduous troubleshooting procedure but it can be done and I just thought I would suggest it. I mean know pffence and just wanted to help somewhat.

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