Procedure 5.1 - Troubleshooting The Keypad And Upper Pca - Precor 9.21 Service Manual

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.
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 J4 and the each of the pins in Table
5.1 (no keys pressed) and Table 5.2 (with the appropriate key pressed)...
Table 5.1. Voltage Test Points (Function Keys Not Pressed)
Place the positive lead of the
voltmeter on...
Pin 3 of J4
Pin 4 of J4
Pin 5 of J4
Pin 7 of J4
Pin 8 of J4
Pin 9 of J4
Pin 10 of J4
9.21, 9.21i, 9.21S, 9.21Si Treadmill
The voltmeter should
read...
5 Vdc ± 500 mVdc
5 Vdc ± 500 mVdc
5 Vdc ± 500 mVdc
5 Vdc ± 500 mVdc
5 Vdc ± 500 mVdc
5 Vdc ± 500 mVdc
5 Vdc ± 500 mVdc
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