Troubleshooting Heart Rate Issues - Matrix T3X-05 Service Manual

8.15 TroUbleSHooTiNG - HearT raTe iSSUeS
1) sYMPTOM:
a. No heart rate.
b. High or irratic heart rate.
2) sOLuTION:
a. With a multi meter set for DC Voltage, place one prong of the multi meter on each of the HR plates on the handlebar (Figure A). A
correctly connected HR grip will have a DC Voltage reading of between 0.5 and 2.0. If this reading is correct, skip to Step b.
- If the reading is not correct, remove the screws holding the 2 halves of the HR grip together and check the connection of the HR grip
wiring to the grips (Figure B). Replace the grips if any damage is seen to the plates.
- Remove the console and split the plastic and metal portions of the console frame to expose the HR board (Figure C).
- Check the connection of the HR grip wiring to the 6 pin Y cable attached to one side of the HR board. Use a multi meter set for
ohms to verify the continuity of these wires. If the ohm reading is more than 1 (or not there at all), replace the HR grip wiring (this will require
replacing the HR handlebar). If the ohm reading is correct, your issue is not with the HR grip / HR wire portion of the HR system.
b. Perform a continuity test on the treadmill console (see Service Bulletin - Continuity Test on Matrix Treadmills).
- Verify the HR board ground wire. With a multi meter set for ohms, place one prong on the HR board ground wire, and the other on
the console ground screw. You should get a resistance reading of 1 or less. If you get a reading over 1 (or none at all), replace the HR board.
- Check the continuity of the wire that goes from the HR board to the Translator Board. With a multi meter set for ohms, place one
prong on the 3 pin wire connecting to the HR board and the other on where this wire connects to the Translator Board (Figure D). If you get a
reading of over 1 (or no reading at all), replace this wire.
- Check the connection of the wire that goes from the Translator Board to the UCB. Replace this wire if needed.
- If all wiring checks out good and the unit is still having HR issues, replace the HR board.
- If the HR board does not resolve the issue, replace the UCB.
fiGUre a
fiGUre C
CHaPTer 8: TroUbleSHooTiNG
HearT raTe iSSUeS
fiGUre b
fiGUre d
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