9.23, 9.27 Treadmill
Page 15
Procedure 5.1 - Troubleshooting the Keypad
Note:
All resistance measurements must be performed with power removed from the treadmill.
Performing resistance measurements with voltage applied may damage your ohmmeter
.
Procedure
1.
There are two possible fault modes for the keypad. The key may not function or it may be
stuck permanently operated. The key pad may be tested using an ohmmeter.
2.
Set the on/off switch in the “off” position and remove the AC power cord from the AC outlet.
3.
Remove the four screws that fastens the backplate to the rear of the console and remove
the backplate. Refer to Diagram 6.9. The rear of the upper PCA and the keypad connector
(JK5) on the upper PCA is now accessible. See Diagram 5.1.
Diagram 5.1 - Upper PCA Keypad Connector
4.
When a key is functioning normally, reading across the key with an ohmmeter will give you
an open (
∞
) reading when the key is not operated and approximately 20
Ω
to 30
Ω
when the
key is operated. All of the keys on the keypad may be tested in this manner utilizing the
table below.
Pin 9
Pin 1
