[DIYbio] Re: BioRad ICycler Password or Service Manual

Hi Scott,

I only got this error when I started the iCycler without the upper module. So I would think the iCycler checks on boot up if every ohmic value of the upper module is there. There could be three causes for this error:
  1. The iCycler meassures a high impedance on the upper module (maybe high impedance sensor or Peltier-element)
  2. The connections from the base to the upper module is broken (think of oxidized connectors, loose wire on the connectors and something alike)
  3. The circuit on the base module that meassures those values has a fault (could be any part on the mainboard e.g. broken IC, diode, resistor, capacitor, whatever comes to your mind)

You can check if the causes applies to your machine like this:

1.
  • If you have a second iCycler you can try to swap the upper module and see if the error persists. This would be the easiest
  • You can check with an ohmmeter on the upper module if all values are where they should be. (picture)
Uppermodule - Kopie.jpg



















2. Check the connections with an ohmmeter. Check if the connectors are corroded or some pins are bent.

3. You can check the voltages on the connectors of the base module (picture). If some voltages are missing you can trace the wire to the mainboard and check the corresponding circuit for any fried parts (can't help you with that though). You can check out the picture to see what I meassured on my device. Can't give you a guarantee that those values apply to every machine.


basemodule - Kopie.jpg





















I hope that helps, good luck finding that fault.

Cheers
Lief

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