Troubleshooting - Verity Medical NeuroTrac MultiTENS Service Manual

Problem:
- Cannot reach maximum mA level; or
- The unit cuts off stimulation at certain level; or
- When increase the intensity, zero mA is flashing; or
- Power is cutting off when using
Solution:
It is normal behaviour in our and any other quality muscle stimulators (and TENS machines),
and in most cases resolves itself - please read the guidance below. The stimulation intensity
will drop to zero if you simply press the mA+ button and no electrodes are connected to the
channel on which you increase the intensity. You should attach a pair of electrodes to the
lead wire and the lead should be connected to the channel on which you increase the
stimulation intensity (mA). Our unit is designed to detect any poor or intermittent connection
across the electrodes and to cut off the stimulation output (mA) when it does so. This is a
safety precaution. It is designed to prevent the user from inadvertently turning up the output
stimulation current in the presence of a poor or intermittent connection and then experiencing
a large unexpected powerful surge in the stimulation, when the connection is re-established.
Reasons for no connection if you use surface skin electrodes:
* Check if both electrodes are connected to the same dual conductor lead wire, one
electrode to the black connector (-) and another to red connector (+).
* Check if both electrodes are making a sticky contact on your skin, some electrode
edges could not be stuck due to electrode wear & tear, but the electrode should be
sticking with at least 80% of its field. You may have lots of grease after long-term
use, try new electrodes. You may have dry gel on electrodes; try to make it stickier by
dropping a small amount of water on the black (conductive) side of the electrode and
leave for an hour for the gel to absorb. Don't use wet electrodes! Try some fresh
electrodes as electrodes loose conductivity proportionally to the use time due to
grease and gel getting drier.
* This is the most frequent reason: check if the dual conductor leadwire cable is not
broken, as it might be bent or pulled out too many which results in no conductivity:
try another cable. To check if the cable is good, cross the red and black pin and
increase mA on the unit. If the cable conducts the electricity, the mA will go above
10mA and you would feel the stimulation mild tickling in your fingers, which holds
the crossed pins. If you feel a mild electrical current, this means the problem is with
surface skin electrodes.

Troubleshooting

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