Troubleshooting MTA-1

  • Recipient block holders are held very firmly in place by two magnets located on the base plate. Two strips of tape also help hold the recipient block holders securely by increasing friction. Users who exchange recipient block holders frequently may want to facilitate the exchange by increasing the tape thickness by adding another layer. This increases the gap between the magnets and the recipient block, thereby reducing the magnetic force.

  • If the digital readout does not respond to the control buttons or knob, or if the readout is dim, the micrometer battery may be too old and needs to be replaced. Batteries are located on the underside of the micrometers, and are accessible through the circular holes in the base plate. Reposition the arrayer carefully to gain access to the battery covers. Insert a new battery with the positive (+) side away from the cover, tighten the cover, and check to verify that the micrometer numbers change as you twist the handle. You may need to reinsert the battery two or three times before the battery correctly activates the readout. We recommend Renata, Sanyo, or Duracell type 2450 batteries because some other makes may not fit. A small booklet specifically about the micrometers is included with the arrayer and will provide more information about the micrometers.

  • Tighten the turret pivot screw in 1/8-inch increments until the swinging turret motion is just blocked - do not overtighten.

  • Make sure that both its locknuts are completely loose: the black knurled ring near the base of the handle and the silver knurled knob at the side of the slide.

  • If the array block is made in very high density, there may be an accumulation of residual paraffin, partly caused by the slight size difference between the sample tissue cores and the holes in the array. This makes the middle part of the tissue array protrude upwards, and this phenomenon becomes visible after arraying a large number of samples. In essence, you may be trying to fit too many samples in too little a space. To prevent this, either increase the spacing between adjacent array samples or make the holes in the array block deeper. To flatten any existing outgrowths in the tissue array, warm the block to 35-37 ° C for 15 minutes. While the block is still warm and elastic, place a clean microscope slide on top of the array block, and carefully press downward until all the specimens are at an even level. Let the block cool before removing the slide.

  • Yes. Just remove that sample with the small punch and place a new sample in the same position.

  • The sharpened edge of the punch tip is probably distorted. Change the punch.

  • This situation can be corrected by gently pushing the stylet down against the sample before trying to extract it (tamping). Placing pressure on the top of the sample causes it to compress axially and expand radially, thus creating a tighter fit within the punch tube. Rotating the needle handle slightly also helps break the sample from its base. Longer core samples are also easier to extract than shorter core samples. This is particularly important with the larger punches (1.0, 1.5, and 2.0 mm diameter).

    • Make sure the punch handles are always turned to a consistent position.
    • The punch may be bent. Check it and change if necessary.
    • Make sure that you are not accidentally moving the turret while pushing down the sample.
    • Punch alignment may have changed (for example, after replacing the punch). Realign the punch.

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Estigen OÜ

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