Fluke 8060A repair help please?

[mark hodsman]

Apologies for posting this in test equipment. Probably more on theme here.
I was merrily enjoying the reliability of the 8060A dmm and took a look at the power jack on the side and for the first time in its long history - I jammed in a  9V wall wart supply (not connected to mains btw). Since then it blew the bussman fuse and I can see no 5V anywhere on the board. Anyone help track down the potential problem? Im now without a meter but I can borrow a meter (albeit basic functions) as I did to test for fuse failure etc.

Thanks in advance. I do have the schematic btw

[voltz]

Hi,
A link to the schematic would be useful for other readers. However i have a PDF of it here so i would suggest check for voltage at TP1 and Q1 FET from battery. This is assuming the fault was created by an unsuitable power supply and not some other fault condition.

[mark hodsman]

Yes I can confirm that apart from 9V battery voltage at one or two locations on the board there is no other +5V or -5V. There was no magic smoke or drama. IT was display blanked and that was that. I have checked TP1.

There was no power applied with the wall wart though. It was merely just inserting the jack into the socket that caused the fault

[mark hodsman]

Yes I checked TP3. Thats close to the Zener VR1? zilch. I guess it must be the MAC chip then which is a bit catastrophic given that no voltage was actually applied. Just an unplugged wall wart. Seems very terminal I think... {

[voltz]

For reference, there's a good blog here including a list of TP voltages:
http://mrmodemhead.com/blog/fluke-8060a-repair/

and manual here:
http://media.fluke.com/documents/8060a___imeng0300.pdf

[ModemHead]

There was no power applied with the wall wart though. It was merely just inserting the jack into the socket that caused the fault

The DC coax jack contains a switch that disconnects the battery.  Look inside the jack to make sure the leaf is not hung up or not making contact for some reason.  Simple stuff first...

[mark hodsman]

Mr Modemhead....its fixed. Thats what it was/is a faulty contacting switch.

Many thanks for everyones help.

[ModemHead]

Mr Modemhead....its fixed.