Opening the Fisher F5 (+video). Machine repair

They say if you supply your Fisher F5 with 20V, you’ll achieve the better performance from it (I don’t know for sure if it’s true)… How to open the F5? What kind of a processor does this machine have, and what is its weak point? See the photos (and video): opening and repair of the Fisher F5.

Opening the Fisher F5 (+video). Machine repair

The Fisher F5 is powered by 6-20V. It’s with regard to the question of the cases when the F5 can have 1 Krona battery as power source. Current consumption: 22 mA. The machine has a classical VLF circuit. The signals are processed by a 13-bit AD converter MCP3301. A trouble spot in this microcircuit is the transmitter part getting out of order, which can be tested with an oscilloscope in a matter of seconds (after it has been opened, of course).

Opening the Fisher F5 (+video). Machine repair

The old Fisher F5 came with a push-on coil connector. Since 2010-2011, presumably, the F5 have a newer screw-on connector.

Opening the Fisher F5 (+video). Machine repair

Opening the Fisher F5 (+video). Machine repair

Opening the Fisher F5 (+video). Machine repair

Opening the Fisher F5 (+video). Machine repair

Opening the Fisher F5 (+video). Machine repair

Updated

All content related to the Fisher F5 is collected here (news, tests, comparisons, different reviews). Plus there is additional info about the Fisher F5 on Knowledgebase pages.

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2 Responses to Opening the Fisher F5 (+video). Machine repair

  • Hi,
    I am opened too. Cleaned out the dust, used hairdryer, refresh contacts.
    The solder quality is high, precizious.
    The button circuit is a realy crap, does not work well after 3 years .
    Need to press strongly,than maybe works.
    Pin point button is totally gone anyway. FishLabs won’t send you parts.
    Repair is cost over 100 dollars under warranty.However sold with 5 year warranty, if you have no receipt.
    Performance is still good, but i am using another coil.
    Work with one battery as well.I am using 2 x rechargable 800mAh , 9V batterys.
    Not a bad machine, just expensive and the warranty is good for nothing,
    Volume level not adjustable.Freq works between 7-8 Khz, I would happy about 3-18 Khz.
    There is a potmeter inside on circuit. Who knows, what is for?

  • Weakest point pictured. However the machine work fine without to use buttons.

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