House Find: Broken Mac Tools Fluke 77 II Multimeter

[salvagedcircuitry]

If a house includes a Fluke multimeter, does that make it a good house?
I think so   

After sorting through various odds and ends, I found a MAC Tools ET77DMMA Fluke multimeter shoved in a very stuffed drawer of a parts.
It looks like a 77 Series II. It's still kickin' but it's mighty off. It measured a 9v battery as 11.5v 












Visually, I do not see anything that looks bad, but this looks simple enough to troubleshoot. Hopefully I'll get her up and running ASAP

[retiredcaps]

but it's mighty off. It measured a 9v battery as 11.5v 

Suggestions.

1.  I see the 9V battery is dated Dec 2019.  Is that a brand new never used battery?  Dead or marginal batteries can give inaccurate readings. 

I routinely put old smoke detector 9V batteries in my meters especially the older Flukes since they can wring out every last bit of energy.  However, when used 9V battery get below a certain threshold and BEFORE the low battery indicator comes on, sometimes I can inaccurate readings.

2. Before touching any Fluke trimmer pots, do you have another multimeter that you can do comparison voltage measurements?  For example, can both meters measure a 9V battery or ATX DC power supply at the same time?

3. Do other functions like ohms work fine?  If you short the probes, do you get 0.2 ohms?  If you measure a 1k ohm resistor, do you get 1k?

4. When you put the meter in VDC and short the probes, do you get 0.00V?

[Joust]

I would like to bump this thread.
I recently dug up two of these old Gems i would like resurrect.
i have a model 70 and a 23. both are part of the same Service Manual.
i have said schematics if i can post it i am allowed. Fluke apparently sent it out.

[retiredcaps]

I recently dug up two of these old Gems i would like resurrect.

Start your own thread and list the problems and I will then make suggestions.  Tell us what works and what doesn't work.  Post clear focused pictures as well.

[Joust]

moot....
house burned down
have to buy all new meters now