The big white input resistor above selection knob is probably open. Measure resistance between pins.
Input pin is nearest to those big green resistors. Resistance between first and second pin should be about 10 Mohm and others I don't remember. Check also that there are resistance between resistor input and positive input socket.
There is 3.5Ω between the input terminal and the resistor, and there is 10 MΩ between the input pin and common.
Every pin on the large, thin rectangular package seems to have a resistance. The smaller component labelled 10nk1000 (A capacitor?) appears to be open circuit when I check it for resistance and capacitance.
1. Yellow is the fusible resistor. It should measure around 1k ohm.
2. Red is the PTC. It should measure around 1.1k ohm.
3. In blue are the MOVs. All 3 should read open circuit in resistance mode.
Report all measurements.
1. 0.954KΩ
2. 1.216kΩ
3. Red component: 101.4K
Blue Component closest to red component: Open Circuit
Blue Component closest to DF06S: 13.15MΩ
Might have a problem here.
Maybe cleaning function selector tracks and checking spring contacts are all there and in good condition could help too.
That looks a little dirty on your meter.
As for the state of the input section of your fluke you can actually get a quick idea on that just using another DMM and measuring the across the Fluke's socket.
Spring contacts look to in good condition, I gave the function selector tracks a clean and there was no difference. I think the problem lies in the input protection.
The socket seems to measure Ok, assuming 10MΩ is normal.
Have you checked to see if the input jack assembly is bad? Common problem on these. Just plug the test leads into the 187, and measure the input resistance with another meter. Should be around 11 MegOhm.
I measured 10MΩ, everything seems to be in order solder joint wise too.
Thanks for the help everyone! I didn't expect all the replies, it's been great.