Precor c944, Service Manual, Page: 18 / 46

C944 Treadmill
Page 18
Procedure 5.1 - Troubleshooting the Keypad and Upper PCA
If the function keys on the electronic console are unresponsive, the problem may be either the
upper PCA or keypad. This troubleshooting procedure gives you the information you need to
determine which of these components is malfunctioning.
Procedure
1. Set the circuit breaker in the “off” position.
WARNING
Before continuing with this procedure, review the Warning and Caution statements listed in
Section One of the Residential Treadmill Service Manual.
2. Remove the screws that secure the upper display assembly to the upper handrail. Carefully,
pull some excess interconnect cable out from the targa upright. Rotate the display housing,
so that the rear of the upper PCA is facing upward, and set the display housing on the upper
handrail.
3. Attach the wrist strap to your arm, then connect the ground lead of the wrist strap to the
treadmill frame.Set the voltmeter to a range that will conveniently read +6 Vdc.
Diagram 5.1 - Upper PCA Component Layout
4. Set the voltmeter to a range that will conveniently read +6 Vdc.
5. Set the circuit breaker in the “on” position.
6. Use a DVM, set for DC volts, and read between pin 6 of J3 and the each of the pins in Table
5.1 (no keys pressed) and Table 5.2 (with the appropriate key pressed)...
U3
J5
U13
J4
RN5
RN4
2
1
26
25
J2
J1