Troubleshooting
Model: C531U
Malfunction: HTR heart rate malfunction
Circumstance: Hold HTR contacts with both hands;
Heart rate values are incorrect.
Possible causes: 1. HTR wires are not connected.
2. HTR board is defective.
3. Display wires are not connected.
Troubleshooting: 1. Inspect display wire connections.
2. Inspect bridge board HTR wires.
3. Inspect HTR contact wires.
4. Inspect HTR board indicators.
5. Replace the HTR board.
3-7-1
Display
board
HTR board
S
E
N
S
O
R-
L
S
E
N
S
O
R-
R
HTR board indicator LEDs
LED
Name
Explanation
LED1
Telemetry
Flashes to indicate incoming telemetry signal.
LED2
HTR contact Lights to indicate hands on contact plates.
LED3
HTR output
Flashes to indicate incoming HTR (contact)
signal.
LED4
Heart rate
signal output
Flashes to indicate heart rate signal output to
the display
