Landice ELLIPTIMILL E8, Service Manual

Page: 47 / 68

PAGE 47
7. HEART RATE RECEIVER:
The heart rate receiver runs off of DC voltage supplied from the upper display board. The display
board will power the receiver by sending 5Vdc across the black and red wires. When the heart rate
system receives a transmission signal from the chest strap or Contact Heart Rate grips, it will send a
low DC voltage signal back to the upper board across the yellow and black wires. Please refer to the
heart rate diagnosis chart below for further info.
HEART RATE DIAGNOSIS:
CHR Grips Diagnosis:
1. There should be a constant 4.8-5.0Vdc across the red & black wires on CHR Grip
harness. If there is 0Vdc, then make sure that the upper board is powering the h/r
receiver board. Measure across RED & BLK wires at the UPDB. If you measure
0Vdc then the upper board is bad. If the upper board is sending 5Vdc to the
receiver but the receiver is not sending 5Vdc to the CHR grips then the receiver is
bad.
2. If the CHR Grip’s are working properly this is what you should see with your
voltmeter (not touching the grips):
TABLE A
WIRES Vdc OHMS
RED & BLACK 5Vdc No reading
RED & WHITE 0Vdc No reading
BLACK & WHITE 4.85Vdc 1.67M ohms
If the CHR Grip is working properly with a Pulse Simulator or when touching the
grips, this is what you should see on your meter:
TABLE B
WIRES Vdc OHMS
RED & BLACK 5Vdc No reading
RED & WHITE Voltage fluctuation between
3.2V – 4.6Vdc *NOTE:
Fluctuation will get faster as
you increase heart rate*
No reading
BLACK & WHITE Voltage fluctuation between
.3V – 1.5Vdc *NOTE:
Fluctuation will get faster as
you increase heart rate*
4.5M – 23M ohms *NOTE:
Fluctuations will get faster
as you increase the heart
rate*