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8 The following voltage reading must be taken while the unit is in
motion. Extreme care must be taken to keep meter wires, hands, etc.
clear of all moving parts. Using a DC voltmeter, measure the voltage
between TP24 (7.5V) and TP14 (DGND). The voltage measured should be
approximately 7.5 Vdc. If the voltage is significantly low, replace
the lower PCA.
9 Reconnect the interconnect cable to the lower PCA and repeat the
voltage measurement in step 8. The voltage measured should be
approximately 7.5 Vdc. If the voltage is significantly low, the
problem is in the upper PCA or the upper to lower PCA interconnect
cables.
Figure 18: Lower PCA Test Points
10 Troubleshoot the upper to lower PCA interconnect cables as per
procedure, Troubleshooting the Interconnect Cable (on page 150).
11 If the upper to lower interconnect cable is 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.
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