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5.4. Identification of cause when a malfunction of the device is suspected
If the noise persists in a particular electrode even after setting an electric shield, moving the possible noise source or unplugging
the power cable, a malfunction may have occurred in the device. Identify the cause by the procedures below:
Procedure 1: MED Probe
Turn the orientation of the MED Probe by 90° and connect it to the MED Connector. Check whether the electrode where the noise
is generated moves to a position according to the orientation of the MED probe (e.g., whether the position where the noise occurs
moves from Electrode 1 to Electrode 8). If the position moves in line with the orientation of the MED probe, the coating of the
relevant electrode may have come off or the insulation layer on the ITO lead pattern to the electrode may have been damaged (if
it is detected in the first time use within 6 months after buying, it has an early failure and will be replaced with a new one). If the
position does not move, proceed to Procedure 2 and the subsequent procedure.
Procedure 2: poor contact of cable or lead
If poor contact is detected in the output terminal of the MED Connector or the input/output terminal of the MED64-Entry
Amplifier, disconnect the SCSI cable completely and connect it again. Check whether the lead or alligator clip connected to the
GND terminal has come off or not.
Procedure 3: MED Connector
Check whether poor contact with the MED Probe terminal occurs or not because of sebum or dust on the contact pin. Wipe the
contact pin by pushing it with an eyeglass cleaner cloth and attach it the MED Probe again. If the noise persists, visually check
whether the levels of some contact pins are lower than those of other contact pins. Contact pins are filled with oil. If the oil comes
off due to age deterioration and a pin becomes less elastic, the pin stays in a depressed position. This causes unreversible poor
contact between the pin and the MED Probe terminal, which necessitates repair by replacement of the substrate. If the noise
disappears after replacement with a normal MED connector, the cause is identified as wear of the contact pin.
Summary of Contents for MED64-Entry
Page 1: ...MED64 Entry Manual ...
