STEP EXCITE: Service & maintenance manual - rev. 1.4
Page 6.26
6.12. THERE IS NO HEART SIGNAL
6.12.1. HFU TELEMETRIC RECEIVER
The machine displays this error if:
1. electromagnetic noise saturate the HR receiver which does not display any value due to a
specific SW filter which cut every signal, greater than 220 bpm;
2. the receiver is not working properly;
3. the receiver is not supplied by the display board.
THERE IS NO HR
SIGNAL
Is the supply v oltage correct at
the input to the receiver?
Is the supply v oltage correct at
the output of the display board?
Replace the receiv er
Replace CBQ-28 cable
2
3
YES
NO
YES
Replace display board
NO
Carry out the
troubleshooting procedure
"THE TELEMETRIC
SIGNAL IS INCORRECT"
1
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1) Carry out the troubleshooting procedure 6.13. “The telemetric heart rate signal is incorrect”.
(2) Place the tester probes across pins 1 and 3 of connector CN1 of the receiver. The measured
value should be +5 Vdc.
(3) As for step (1) but across pins 1 and 8 of connector CN3 on the display board.
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