Fluke 199B Scopemeter Repair

G'day all,
I am looking to repair my Scopemeter. There is some obvious heat damage to the battery connector outer shell and what appears to be a "fried" component adjacent to it in the photograph.

Can anyone please identify the damaged component as I have yet to source a wiring diagram and service manual for the unit?

Appreciate your help.

Cheers

Grasshopper

 

G'day Kris,
Battery was being changed and yes accidentally touched battery connection in reverse and instant flash over. This was a while ago now and I decided to give a repair my best shot and maybe learn something in the process. Yes user stupidity could have caused more damage but this component is the most obvious victim and I am hoping maybe sacrificed itself to save the unit.
Good news is I now have Service manual 206 pages and attached is the power circuit diagram.
I am looking to examine the unit now I have the diagram, carefully remove the component and see if I can identify it and source a replacement.
Any advice would be greatly appreciated.
Cheers
Grasshopper

 

Just adding Scopemeter Power Supply Block Diagram.

 

G'day Kris,
Please see image attached. Battery connector is orientated correctly and I have added the pin numbers I believe are correct and agree with your advice.

The red cable battery positive +7.2V (I have confirmed by checking battery itself between red pin 1 and ground pin 2)
).

Not sure if my wiring diagram is accurate for my machine especially as I do not have the fan shown on the right of the diagram 9-15.
I'm just about to remove the component.

Many thanks for your support.

Grasshopper

 

Component removed, area cleaned no obvious visual damage.

 

Component Length. 5 mm nominal?

 

Component Width. 2.5 mm nominal ?

 

Component depth at each end, thickest places. 0.5 mm Nominal?

Ok Kris,

There it is the story so far. If you can identify the c omponent and suggest a suitable replacement I can try I would be most grateful?

Once again thanks for your patience and support.

 

Hi Kris,

If I look at the circuit diagram I look at R4101 which is as the attached page from the manual. That's it the grasshopper has reached the limit of his wisdom Master.

 

Hi Steve,

Resistance shows as 0.4 ohms.

On both sides of device looking very closely here there are what look like scribed parallel lines. Please see sketch attached as camera cant pick it up very well.

 

That's great guys thank you. Time to order the component and replace it. I will update as soon as.

Cheers

grasshopper

 

Ok Guys, resistor now replaced.

On pressing start key I get a normal beep, screen back light starts up but screen is a hash of lines with some clear text in the background (suggests software starts to boot?).

After a very short time there is an audible "click" and the unit shuts off.

I do have a video of what happens but I am not sure if video can be uploaded to the forum?

Any advice or ideas appreciated.