Precor 905e - Procedure 6.2 - Replacing the PROM

905E, 9.1, 9.10 Treadmills
Page 24
Procedure 6.2 - Replacing the PROM
This procedure gives you the instructions for removing and replacing the PROM (U3) mounted
on the upper PCA.
Wear an anti-static device (such as a wrist strap) when you perform this procedure. Anti-static
kits can be ordered from Precor Customer Service (Precor part number 20024-101).
Dismounting the Upper PCA
1. Place the magnetic safety key in the OFF position, then unplug the treadmill from the wall
outlet.
WARNING
Before continuing with this procedure, review the Warning and Caution statements listed in
Section One of the Residential Treadmill Service Manual.
2. Loosen the set screws that secure the crank handle to the top of the lift jack. Remove the
crank handle and set it aside.
3. Remove the bolts and washers that secure the electronic console to the upper handrail
clamp.
4. Remove the screws that secure the upper electronic chassis to the electronics housing
assembly.
5. Attach the wrist strap to your arm, then connect the ground lead of the wrist strap to the
treadmill frame.
6. Carefully disconnect the keypad from the upper PCA.
7. Remove the screws that secure the upper PCA to the electronics housing assembly. Keep
the ribbon cable connected to the upper PCA.
Removing and Replacing the PROM (U3)
Keep the new PROM in its protective packaging until you are ready to insert it into the chip
socket.
Caution
Notice the orientation notch on the PROM (U3). The new PROM must be positioned with the
same notch orientation. Replacing the PROM backwards will destroy the PROM.
8. Using the chip puller, remove the PROM (U3) from the upper PCA (see Diagram 6.4).
9. Carefully insert the new PROM with the correct software version number in the chip socket.
Take care not to bend the legs of the PROM.