Wireless Heart Rate Does Not Work - Precor AMT12 base Service Manual

b. If the HHHR does not function correctly, continue with step 3.
3. Verify that the HHHR board has the correct operating voltage. Connect a voltmeter to VCC and
Ground on the Power/Signal connector. The voltage should read between 4.5 and 5.5VDC.
4. Using an ohmmeter, measure between the grip contacts and the cable connector end. Verify the
wiring of the HHHR contacts (top left, bottom left, top right, bottom right) go to the proper pin on
the Grip/Contact connector, and that none of the lines are shorted.
a. If the cable is miswired, Correct the wiring error.
b. If the cable is shorted, replace the cable.
c. If the cable checks out OK, Continue.
5. Verify that the grip connections are free of corrosion.
a. If NO, Replace the corroded HHHR grips.
b. If Yes, Continue.
6. Verify that there is a ferrite bead around the cable from the HHHR board to the upper PCA. (GEN-
06 treadmill only)
7. If the above procedures do not correct the problem, replace the heart rate board.
8. Verify that the unit does not display a heart rate with only one hand on a grip. This would indicate
static damage, and require replacement of the heart rate board.

Wireless Heart Rate Does Not Work

1. Verify wireless heart rate with a known good chest strap transmitter or test transmitter. If the heart
rate reading is erratic, incorrect, or absent, continue with step 2.
NOTE: It may be necessary to lean in closer to the console at first to allow receiver to begin to
acquire a heart rate signal.
2. Verify that the HHHR board has the correct operating voltage. Connect a voltmeter to VCC and
Ground on the Power/Signal connector. The voltage should read between 4.5 and 5.5VDC.
3. Identify other sources of wireless interference signals in close proximity to the unit (such as Wi-Fi
networks, cordless phones, etc.).
NOTE: This is not to say that something like a Wi-Fi network cannot be present at all, but if it is
transmitting in close proximity the heart rate system MAY pick it up. These interference sources can
© Precor Incorporated, Unauthorized Reproduction and Distribution Prohibited by Law Page 51