Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Picked up this multimeter known to be not working

Had no display whatsoever

Hoped it was a dead battery  :tu:

Opened it up.  No battery  :tu:

Installed new battery....only display on certain modes.   :grr

Checked internal $30 fuse.  Open  :grr

Installed new fuse.  Fingers crossed.  No change  :grr

Connected mini-grabbers and 150 ohm resistor

Continuity mode.  Nothing

IMG_20251115_195152776.jpg

200 ohm range
Working

IMG_20251115_195146417.jpg

2000 ohm range
Working

IMG_20251115_195138167.jpg

20,000 ohm range
Working

IMG_20251115_195130844.jpg

200 kohm range

Back to nothing  :grr

IMG_20251115_195123150.jpg

Not really equipped to diagnose or repair tiny surface mount stuff.

 :'(

I would see if you can verify switch contacts for bad ranges/functions.

Quote from: g1 on November 16, 2025, 10:46:16 AMI would see if you can verify switch contacts for bad ranges/functions.

Agree with G1.  I had a similar issue to a meter.  The dial is connected to a circular metallic gizmo that turns and makes connections to points on a circuit board.  That metallic gizmo was dirty and had slightly deformed.  So I bent it here, bent it there, reassembled and voila, the meter and functions came back to life.  Make sure you also use some spray cleaner on all contacts and pots.