Where can I get this replacement component or something like it, the black motor speed dial switch ?

I don't mind modifying the tool to fit another component if I have to . This is a brand new Bosch tool ( no warrenty ) so worth saving but not worth buying a whole new board.

 

It would help if you posted a picture of the whole unit and state its make and model.

 

The number on it is a Bosch part number, they only sell the entire board as a spare and it costs more than the whole tool.

https://www.powertoolspares.com/bosch/multipurpose-tool-pmf-180-e.m/3603a00000/spares

 

...the black motor speed dial switch...

What you poorly mean can be the round plastic knob; or the potentiometer under it, or the circuit that varies the speed when turning, or ???

Worst case, a dimmer control onto its plug cord could work eliminating the original, or

----> https://www.hellasdigital.gr/electr...voltage-regulator-dimming-dimmers-thermostat/

----> https://www.cableworks.gr/ilektroni...d-controller-module-voltage-regulator-dimmer/

---->

----> https://budgetlightforum.com/t/about-ac-dimmers-speed-controllers-2000w-scr-dremel-and-etc/49586/10

 

Replacing a whole board because one component has failed is often not cost effective, as stated. It does not look like the problem is the knob.
It should not be that difficult to unsolder from the other side of the circuit board. If the problem is a failed POT (potentiometer), those are available from a number of reputable sources, such as Digikey and even Newark. And other folks here can name other suppliers that actually correctly describe the products they sell.

BUT before that, what makes the TS think that the speed set resistor is the problem???

edit: No response 4 hours later.

 

I won't be able to diagnose this problem with the PCB and I can't replace it , the tool only runs flat out which is not doing it any good, is there an off the shelf speed control pcb that i could put in a small box inline with the main cable external to the tool ?

 

Works on full speed only - that DOES sound like a bad potentiometer. @MisterBill2 raised the question I would have too. What makes you think the pot (potentiometer or speed dial) is faulty? It IS the first thing I'd suspect as well. Further under suspicion would be the solder joints on that pot. A cracked (broken) connection (fractured solder joint) can play havoc in diagnosing the problem.

Got a TV for free once long time ago. The horizontal control circuit was faulty. First thing I did was reflow all the solder joints on that circuit. Tested the TV and thought I don't know which joint was bad, the TV was working just fine.

Bad pot? Possible.
Bad solder joint? Also possible.
Bad component other than the pot? Also a possibility.

Today they make a lot of small circuitry using surface mount devices (SMD's). Finding a bad solder joint there can be extremely difficult. Usually reflowing all the solder joints will eliminate the possibility of a SMD component having a bad connection.

Have said this many times before - fully diagnose the problem before you start throwing parts at it. Otherwise you'll end up with a new drill (buffer, sander, grinder or whatever) for your power cord.

 

This is a brand new Bosch tool ( no warrenty ) so worth saving but not worth buying a whole new board.

Remind me to never buy Bosch tools.

 

Works on full speed only - that DOES sound like a bad potentiometer.

.... or a shorted triac.
An off-the-shelf phase-controlled lamp-dimmer in the mains supply would likely work (as per the post #4 links).

 

Would this work ?

it might even fit inside the tool .

https://www.ebay.co.uk/itm/39461024...31EbyPMS6i&var=&widget_ver=artemis&media=COPY

 

Certainly an external controller could work to set a drill speed, no question there. BUT when using a VS drill motor to tighten screws or bolts, the 500 RPM speed, or higher speed, could be a problem. Driving a sheetrock screw with a 1200RPM motor does not sound like a workable choice.

 

Would this work ?

Very likely. No great loss if it doesn't.

 

Certainly an external controller could work to set a drill speed, no question there. BUT when using a VS drill motor to tighten screws or bolts, the 500 RPM speed, or higher speed, could be a problem. Driving a sheetrock screw with a 1200RPM motor does not sound like a workable choice.

I don't recall seeing anything about this being a drill motor. I DID mention drill motor but also mentioned "buffer, sander, grinder or whatever". But certainly, your point is well taken. Some things don't work well on low RPM's.

fully diagnose the problem before you start throwing parts at it. Otherwise you'll end up with a new drill (buffer, sander, grinder or whatever) for your power cord.

Note of curiosity - - - I built a shaker table with a screen to separate dirt from larger objects such as small rocks that wouldn't fit through a 1/4" screen mesh. To shake the table I hung a reciprocating saw with a saw blade cut and bent to bolt to the table. The saw was variable speed. But I couldn't get it to shake slow enough. So I plugged it into a variable speed fan controller. With the controller on a very low speed and the trigger on the saw to a very low speed I was able to make a reciprocating table that shook back and forth fast enough to move the large debris off the end while shedding the dirt and small rocks into a bin below. Moral of the story: You CAN control a variable speed motor with a variable speed controller. I've since disassembled the thing because it outlived its usefulness. Otherwise I'd go take a picture of the rig.

 

The tool is a 130 w vibrating multi tool

Bosch PMF180 E