Fisher1266x Question

[akasyto]

I have bought a second hand Fisher 1266X.I have question about sens poti switch: when i measure two light green wires (i pull the poti or push the poti) there always 0 ohm ,so the switch is broken, allways connected.
In what position should be max sensitivity when the switch is open or closed.On my detector is written Push MAX but i have picture from this forum with PullMAX label.Or is that different machine?.

[Altra]

Looking at the schematic it appears to be maximum when the switch is closed

[akasyto]

So when r414 1Meg added paralell?

[Altra]

Yes, it allows the signal line to be adjusted more positive. Then the comparator LM393 can trigger on a smaller change
in signal. There is a point where it becomes unstable and useless to go more positive.

[kt315]

Or is that different machine?.

with black color panel - fisher 1265. while schematics are similar for both 1265 and 1266.

[akasyto]

Ok thank You All.
Regards

[Funfinder]

With modified connections you can use this push-pull button-switch to get a huge sensitivity range.
The ground balance is pretty much fixed anyway.

For better recognition of very small gold objects solder some 5-50 pF capacitor (test it first) parallel to the coil.

And btw. this detector is a nice collectors item and it still finds good stuff but some modern (but still fine analog)
detectors reach double the depth! Profis better should forget it, its also extremly e-smog sensitive and the coil is too small
for the deep stuff. When was it produced first? Probably around 1991. Cool device for retro-treasure-hunting...

[akasyto]

I have a 11 Hot Head coil on it.Like that one on the picture.

[kt315]

give please pics the YOUR housing inside. all I see here only files from the DVD archive. people also answer by the files. all that seems me only some kinda
ping-pong game round - you put - they put - you put - they put. SOMETHING I have NOT GIVE.