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People often forget about factory reset functions since it is still a rare feature. I am a proponent of resetting newer generation digital metal detectors on a regular basis, especially if settings get changed around a lot. The more setting changes are made, the more chance of a programming bug slipping in and messing with the operator. This is the procedure for the many F75 variants out there.

From the F75 Owner's Manual page 10:

RESET function
The F75’s microprocessor saves all settings which you input, even after the power is turned off. If you wish to reset the settings to the factory preset, follow this process:

  1. Turn detector off.
  2. Press-and-hold the red MENU button and push-forward-and-hold the TOGGLE SWITCH.
  3. Turn the detector on, while you are still holding the controls.
  4. Release the MENU button and TOGGLE SWITCH.
  5. See the F symbol. When the F disappears, the detector is reset. Note: some latest F75 versions may show five pairs of number instead before displaying the F - the ten digit serial number.
  6. All settings have now been returned to factory defaults.

fisher-f75-plus-ltd-se-metal-detector.jp
Fisher F75 Metal Detector

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Well, the T2 has no ability to save settings, and so it does come on in factory default settings every time you power up. That is not the same as doing a factory reset however, and so while you will not see any settings revert on the T2 when doing a factory reset it is still not a bad idea.

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  • 1 year later...

The F75+ is a different detector, an updated version of the F75 referenced in the original post. The reset function was changed to incorporate the new DST feature. From page 10 in the Fisher F75 Ltd DST | F75+ User Guide:

RESET function
The F75’s microprocessor saves all settings which you input, even after the power is
turned off.
If you wish to reset the settings to the factory preset, follow this process:

  • 1. Turn detector off.
  • 2. Press-and-hold the red MENU button and push-forward-and-hold the TOGGLE SWITCH.
  • 3. Turn the detector on, while you are still holding the controls. At this step, you can turn DST on or off (see pg. 16 instructions)
  • 4. Release the Menu button and Toggle Switch. Screen will display 5 pairs of numbers (10-digit serial number), followed by “LE”. When LE disappears, the detector is reset.

and then from page 16:

The user may choose to operate with DST or without DST.
The default setting, at power-on, employs DST
To turn DST OFF, perform the following:

  1. Turn detector off.
  2. Press-and-hold the red MENU button and push-forward-and-hold the TOGGLE SWITCH.
  3. Turn the detector on, while you are still holding the controls.
  4. Continue to hold the controls.
  5. See the "90" displayed.
  6. Rotate SETTINGS KNOB clockwise.
  7. See "91" displayed.
  8. Release the MENU button and TOGGLE SWITCH.

Upon release of the controls, the detector will operate WITHOUT DST

DST status is saved to memory after the user performs this procedure.
Each time the detector is powered back on, it will continue in the programmed setting.
The same procedure is used to turn DST back on, except that the SETTING KNOB is turned counterclockwise to change "91" to "90".
DST can be turned on or off as desired, but each change requires the user to first power the detector off.

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Since I am somewhat new to the F75LTD DST/F75+ I have done several resets which have gone just like Steve's last post. First I get either 90 or 91 then after releasing the toggle and menu button I get the serial number and start-up concludes.

I have been puzzled by the DST On and DST Off settings stated in the manual and have done a lot of research including the findings of Keith Southern and Tom Dankowski. At least for me in my EMI overloaded area, the 91 setting (supposed to be DST Off) is way quieter than the 90 setting (supposed to be DST On). In my backyard, which has rendered numerous famous detectors absolutely incapable of operating due to EMI (impossible to hear a real target for all of the chatter) I can run my F75LTD DST at 80 sensitivity in any setting or process including All Metal when set to 91. If I set it to 90 I might be able to hear my test garden targets if I turn the sensitivity down to 20 or 30. So, who knows........

Jeff

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14 hours ago, Steve Herschbach said:

The explanation in the manual and the arbitrary numbers are such that it would be easy for them to have got it backwards. One would assume whichever setting is quieter has DST engaged.

So in essence the 90-91 could be backwards? Or at least a possibility? I’ve never personally changed them so I don’t know yet, I do know the other day when I reset it all settings went to factory, and it was a lot quieter, but I also may have switched 90 to 91 without realizing it

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8 minutes ago, Relicrecoveryspecialist1 said:

So in essence the 90-91 could be backwards? Or at least a possibility? I’ve never personally changed them so I don’t know yet, I do know the other day when I reset it all settings went to factory, and it was a lot quieter, but I also may have switched 90 to 91 without realizing it

There have been numerous F75 revisions, many undocumented. Manuals do not always keep up and mistakes happen. I’m not saying it is the case here but anything is possible. DST should not make the machine noisier so real world evidence does have to be taken into account. I would not insist on running the machine like the manual says contrary to the evidence of my eyes and ears.

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