Fisher 1235-x schematic

[smi916]

Hi everybody,
i'm looking of a 1235-x coil schematic (male and female connector) because my friend disasembled it and i have to repair.I finished but i find frequency is 10 khz +/- 0.5 khz adjusted by knob.I want to be sure tx and rx coil are right connected.Just another question :on the coil (my friend asks used it from date of purchase detector) there's write Quicksilver (it's spider coil)..does correct coil for detector?

Thank's

[Siliquae_Sid]

I suspect you have the RX and the TX connected the wrong way around. Fishers all (except the CZ's) run at about 5KHz.

[smi916]

Coil

Many thanks Siliquae_Sid.Sorry to delay but i was out of country.
I connetct Tx and Rx in different way and now the detector are working well: if i change frequency (+/- 5 % ) the amplitude is the same.
Just a problem (or 2): frequency is 3.69 Khz (not 5.3 Khz) and penetration on ground it's pour....maybe coil (quicksilver) is not correct for this detector...may i modify wein bridge to change frequency?

What do you think?

Many thanks

[Siliquae_Sid]

I think you may still have a few wires crossed .

Try swapping the coil wires. You have the Rx and TX wired up, but one of them may be "reversed".

Check the picture below it may help you to see which wires go to where.

Good luck and HH

[smi916]

Thanks to info,...yes ,in last my post i connected Tx and Rx like picture but frequency it is about 3.7 khz.
A big doubt is about coil : Quicksilver is correct?
Have you got some ideas about trimmer (inside pcb) setting?
I think people try to repaire detector before me change setting,not about frequency (no way to change it by trimmer) and cause pour performance.
Owner of detector ask me he bought it with quicksilver coil and after 4 years he had a problem with discriminator (i found a false junction on knob).After send to repair the detector doesn't work.

I have a signal generetor if necessary to perform detector.
Many thanks

[Tom in GA]

I too need schematic or trimpot info for the 1235X

I too am looking for either trimpot information (what is the function of each) or schematic diagrams. Fisher denies the existance of a service manual for the 1235X but a friend had one at one time so I know it did exist. He bought it directly from Fisher. I would be willing to pay for a copy of this service manual if anyone has one.

Tom in GA
mailto:[email protected]

[Bojidar]

Hi

Tom,I will try to help you wih diagram,but in the moment i don't have a time.When I find it i will send you (I'm sure have this shematic somewhere on my CDs) and will talk abouth function of trims!Best regards Bojidar

[Sean Goddard]

The ONLY trimpot on these machine that I could see was the intenal Ground Balance. If yo uhave poor performance, it night also be the front end amplifier that has died due to the coil connections being wrong in the first place.

"If you don't understand what you're doing, DON'T mess around with it"!!

[smi916]

wrong coil

Hi ,
my friend gave me a wrong coil!!!! (maybe a cz coil).Now he give me the correct one .
I found the detector are working ,just a high value of disc knob to eliminate the ferrous metal...i've to check.

[Siliquae_Sid]

ROFLMAO

[mayky]

CHECK_FOR_MISTAKES.ZIP
Check for mistakes.