SCIFIT PRO1000 Sport, Service Manual, Page: 8 / 19

7
III. Maintenance Procedures
Procedure 1 - Removal and
Reinstallation of the Power Supply
Board
1. Unplug the unit from the power
source.
2. Remove the crank bars and
crank hub assemblies (Items 7 or
105) from the unit.
3. Remove the screws (Item 14)
that fasten the covers (Item 16) to
the main frame. The covers can
be removed now.
4. Locate the power supply cover
(Item 83) on side of unit. Remove
the four (4) screws and remove
the power supply cover. Be
careful when removing the power
supply cover because of the
plastic ties and brake wires.
5. Cut all the plastic ties.
6. Before disconnecting any of the
wires, make note of the wiring
sequence. Refer to the wiring
diagram, Fig. 5.
7. Disconnect the following:
a. The two (2) white (110 V) and
two (2) black (24 V)
transformer wires. These are
all the wires from J4 on Fig. 5.
b. The black and white wires
from the power entry module
– total of two (2). These are
the wires at terminals ACIN1
and ACIN2 on the LCB.
c. The two (2) red brake wires.
d. The one (1) speed sensor
plug – J5 on Fig. 5.
e. The one (1) ribbon cable.
8. The power supply board (Item
87) can now be removed.
Reinstallation is the reverse of
removal.
9. After reinstalling the power
supply board, perform the
following procedure to test
correct reinstallation.
a. Plug into power source and
turn on.
b. The message “SCIFIT FOR
SCIENTIFIC SOLUTIONS”
should be scrolling across
upper display board. If not,
see troubleshooting table.
c. Press the start button.
d. Turn the crankshaft in a
forward motion.
e. Verify that values are being
displayed in the rpm/Watt
window.
f. Press the up arrow key to
increase the resistance. It
should become more difficult
to turn the crankshaft. If not,
consult the troubleshooting
table.
g. Press the up arrow and hold
until level 22. After 3-5
seconds of turning, the
resistance should be at its
maximum level. If not refer to
the troubleshooting table. If
brake loaded up to maximum
setting, then the job is
complete.
Procedure 2 - Checking Voltage at
the Power Supply Board
1. Follow steps 1-4 in Procedure 1.
2. Disconnect the speed sensor
from the lower supply board at
the J5 terminal. See Fig. 5. Use a
voltmeter to measure the DC
voltage across the speed sensor
pins on the power supply board.
Measure the voltage across the
pin with the red wire (+) and