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9. Reconnect the interconnect cable to the J2 connector of the lower PCA and repeat the voltage
measurement in step 8. The voltage measured should be approximately 5 Vdc. If the voltage is
significantly low, the problem is in the upper PCA or the upper to lower PCA interconnect cables.
Diagram 5.13.1 - Partial View of Lower PCA
10. Troubleshoot the upper to lower PCA interconnect cables per Procedure 9.1.
11. If the upper to lower interconnect cables are found to be good, replace the upper PCA.
12. If you have performed all of the above tests and are unable to resolve the problem, contact
Precor customer support.
CAUTION: Swapping a lower control module from a good unit into a bad unit could easily damage
the lower control module from the good unit, since there could be something in the bad unit that
causes the lower to fail. This could potentially produce two bad units instead of one.
DGND, TP4
PROM
+5D, TP13
DS1 LED
J2 Connector
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