Fluke 8050a repair

[Arkham]

Hi folks, recently I damaged my trusty old 8050a by accidentally reading high VAC (around 700VAC) on the 20VAC scale. I replaced an open internal 1/16A fuse, but now all of the meter functions are wacky.
For example, VDC and VAC read low by ~10% and resistance measurements in all ranges just dance around.

I do have the service manual (attached), but before I try the individual troubleshooting tips, might there be something more obvious which would be affecting all of these features?

I'm comfortable with electronics but have not serviced a DMM before.

Thanks so much for reading.

http://assets.fluke.com/manuals/8050a___imeng0200.pdf

[vindoline]

Hi, my guess would be that you fried the 3 430 volt varistors used as input protection. I've done that before on my Fluke 8060A when measuring HV. They are normally high impedance, but when they go, they go low impedance. This leads to all kinds of squirrelly behavior. They are marked as RV1, RV2, RV3 on the schematic you supplied. $0.86 each. The Mouser part # is: 576-V430MA7B

[Arkham]

Indeed, the first two measure ~20ohms, and the third 10Mohms
Thanks so much for the tip and part #
I will update this thread when I get them installed

[Arkham]

Following up for posterity --
Replaced the three varistors, and R2 which had gone open.
Working great once again!
Thanks for the help!

[vindoline]

Great news