R/E/P > Bruno Putzeys (Designer) - Dave Hecht (Master Tech)

1176 Meter Issue

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DanDan:
I am lucky to own two original 1176LN Revision H. On one of them, the  Meter is behaving in mysterious ways.......  Badly enough that I cannot calibrate the unit.
It just keeps doing different things. I am trying to figure out if it is mechanical or electrical or bizarrely both.

Starting from right now it is off. Meter at approx -10Vu.  If I gently drum on the meter with my fingers, it will descend to around -inf.
Turn on GR button..... It will rise to 0VU.  +4 or +8 it drops down to around -10, and again the drumming will get it to drop to -inf.
Now, during Cal attempts it will sometimes just stick somewhere in the middle, like 12 O Clock. Again drumming will get it to drop or a blast of tone will rise it seemingly normally.
Details:- I think is is intermittently wavering a minute amount, as if the DC driving it is dirty.
On a voice test the meter behaves seemingly normally, including GR, but again settles at -10VU.
Mea Culpa, I have adjusted the mechanical zero in the past. I did not realise this was a do not touch, factory setting.

If I am further lucky, someone here will have seen this type of behaviour before......
Thoughts?
Also, where could I buy a new Meter if I need one?

Tx in advance, DD

RadarDoug2:
Sounds like a sticky meter.

DanDan:
Tz Doug. It does indeed. Although there have been indications that the meter drive circuitry may be in trouble too. Intermittent oddness...... Before I have to buy another meter from the States, I am inclined to take a look inside.  First issue, how to dissolve the Loctite on the meter holding screws?
In a UA manual I found a warning not to tweak the physical zero screws on the front of the meters. Too late! Anyone here known what to do with them?

DanDan:
Right then. Meter is extracted and opened up. The coil is very close to the magnet at top right vs a big gap at bottom left. Anyone know how to recentre?

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