SCIFIT SX1000 User manual

Revision: August 1999
SX1000
Service Manual
SALES: 800-278-3933
CUSTOMER SERVICE: 800-745-1373

1
Table of Contents
Section Page
I. Overview 2
II. Troubleshooting Tables 3
III. Maintenance Procedures
Procedure 1 – Removing the Power Supply
Board 7
Procedure 2 – Checking Voltage at the
Power Supply Board 7
Procedure 3 – Checking and Adjusting the
Speed Sensor 7
Procedure 4 – Removal and Replacement of
the Brake Assembly 8
Procedure 5 – Checking the Rail Alignment 9
Procedure 6 – Adjusting the Rail Alignment 10
IV. Figures
Figure 1 – SX1000 Main Frame 11
Figure 2 – SX1000 Total Assembly 12
Figure 3 – Power Entry Module with
Fuse Holder 13
Figure 4 – SX1000 Wiring Diagram 14
Figure 5 – SX1000 Spindle Bearing
Lubricant Application 15
V. SX1000 Parts List 16

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I. Overview
Purpose.
This manual is designed to assist in service of SCIFIT SX1000 elliptical
exercise machines. The manual is divided into sections to diagnose and isolate
problems. Troubleshooting tables and procedures, along with drawings, are
provided to aid technicians in servicing equipment. The Item Numbers given in
the parts list in Section V can be used to determine the location of various parts
in Figures 1 and 2.
When troubleshooting, the actions taken to resolve problems should be
performed in the order stated. Deviating from this sequence may cause damage
to the equipment and lead to unnecessary repairs.
Technical Support.
For further assistance in service of SCIFIT products, please call (800)
745-1373, extension 21. The technical support department is staffed from 8 AM
to 5 PM C.S.T. Monday through Friday. A voicemail service is available 24 hours
daily for recording messages to request technical support and to order
replacement parts.
Please have the following information prior to calling technical support:
•Model number of equipment
•Serial number of equipment
•Point of contact name and phone number
•Detailed description of symptoms encountered.

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II. Troubleshooting Tables
Table 1 – Electrical Troubleshooting
Problem Possible Reasons Solutions
1.1The machine
appears to be off
when plugged in
and switched “on”.
Faulty power supply
board.
Faulty fuse.
Loose cable connection.
If buttons on the control
display beep when
pressed, replace power
supply board. See
Procedure 1. Otherwise,
check power supply
board. See Procedure 2.
Check and replace fuse if
needed. (See Fig. 3)
Check wire connections
at power supply and
display boards.
1.2Upper control panel
lights are dim.
Power supply board is
faulty. Replace power supply board. See Procedure 1.
1.3Upper board
accepts commands
but pedaling
resistance does not
change.
Dip switch setting is
incorrect.
Power supply board is
faulty.
Set dip switch to 01.
Check and replace power
supply board as needed.
See Procedure 2.
1.4LED’s on upper
board blinking
off/on, then go
dead.
Ribbon cable
connections are loose.
Faulty power supply
board.
Display board is faulty.
Check and replace
accordingly. Unplug and
re-plug machine to reset.
Check and replace power
supply board as needed.
See Procedure 2.
Replace display board.

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1.5Heart rate displays
zero (0) in window Chest strap and
transmitter improperly
worn.
Loose sensor lead
connection at display
board.
Faulty receiver.
Verify that they are being
properly worn.
Check and adjust as
needed.
If there is no audible
signal, replace receiver.
1.6Unit keeps blowing
fuses.
Too many units are
daisy-chained together.
Faulty power supply
board.
Do not daisy-chain more
than 3 units together.
Check and replace power
supply board as needed.
See Procedure 2.
1.7The upper display
resets after starting
a program.
Ribbon cable connection
is loose.
Power cord is loose.
Display board is faulty.
Check cable connection
at power supply and
display boards.
Check and adjust as
needed.
Replace display board.
1.8Program stops,
lines of dots shoot
across screen.
Ribbon cable connection
is loose.
Display board is faulty.
Check and adjust cable
connection as needed.
Replace display board.
1.9Machine shuts
down in programs
but works in
manual.
Display board is faulty. Replace display board.
1.10 Can’t select
program or enter
information and no
beep when buttons
are pressed.
Membrane is faulty. Replace membrane.

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Table 2 – Mechanical Troubleshooting
Problem Possible Reasons Solutions
2.1Rails lock up while
operating. Power supply board is
faulty.
Brake is bad.
Unplug power cord. If
rails move, replace power
supply board.
If rails do not move with
power cord unplugged,
replace brake. See
Procedure 4.
2.2Squeaking noise
external to machine
drive assembly
Rails are not aligned
properly.
Spindle bearings are
faulty.
Check and adjust rail
alignment accordingly.
See Procedure 5.
Spray a Teflon- or
silicone-based
penetrating lubricant,
such as WD40®on
spindle bearings. See
Fig. 5. If noise goes away
but returns soon after,
replace spindle bearings.
2.3No resistance on
pedals when in a
program.
No speed signal
Wires going to brake are
disconnected.
Power supply board is
faulty.
Check and adjust the
speed sensor as needed.
See Procedure 3.
Check that brake wires
are properly connected.
Check and replace power
supply board as needed.
See Procedure 2.

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2.4Very little resistance
at any level. Speed sensor improperly
adjusted.
Bad speed sensor
connection with power
supply board.
Check and adjust the
speed sensor as needed.
See Procedure 3.
Check voltage at power
supply board. See
Procedure 2.
2.5Belt is slipping Not enough tension on
the brake drive belt.
Tighten the belt to ¼”
deflection at 10 lb of
force.

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III. Maintenance Procedures
Procedure 1 - Removing the
Power Supply Board
1. Unplug the unit from the power
source.
2. Lay it on its side.
3. Locate the power supply board
access plate under front of unit.
Refer to item 31 in Fig. 2.
4. Remove the four (4) screws. Be
careful when pulling down the
power supply board 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. 4.
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. 4.
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. 4.
e. The one (1) ribbon cable.
8. 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. In 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. 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 either one of the center
pins (-). The voltmeter should
measure 4-5 volts DC.
3. If there is no voltage, replace the
power supply board.
Procedure 3 – Checking and
Adjusting the Speed Sensor
1. Turn machine on and press start.
2. Turn crank arms at 1 revolution
per second. The RPM window
should display around 60 ±10
rpm.

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3. If the RPM window is displaying a
reading outside of the specified
range, proceed to the next step to
adjust the speed sensor.
4. Remove the hood.
5. The air gap between the brake
flywheel and speed sensor
should be 1/8” – 3/16”.
6. The speed sensor must be
pointed directly at the flywheel so
the eyes of the sensor will
intersect the center of the axis of
the brake. Adjust as needed.
7. Rotate the crank arm again at 1
rev. per second. If the RPM
window displays a number
greater than zero (0) but not
within 60 ±10 rpm, repeat steps 1
- 6. If a reading of zero (0) is
displayed, proceed to step 7.
8. Use a voltmeter to measure the
DC voltage across J5 pin 1 (+)
and J5 pin 2 (-) on the power
supply board. Refer to Fig. 4. The
voltmeter should read 4-5 VDC.
9. If there is no voltage, replace the
power supply board. If 4-5 volts
are present, replace the speed
sensor.
Procedure 4 – Removal and
Replacement of the Brake
Assembly
1. Remove each rail from its crank
arm spindle. First, remove the
snap ring at the spindle outer
edge; then slide the rail outward
and upward off the machine.
2. Remove the two screws holding
the bottle cage below the
handlebars. Remove the single
screw located just above the
power entry module.
3. Remove the five screws from
side of the left cover. Position
the left crank arm pointing
backward and parallel to the base
frame. Pull the front edge of the
cover and slide it inward and
backward to clear crank arm.
4. Repeat step 3 on right side.
5. Disconnect the two red wires on
the right side of brake.
6. Remove the ½” nuts and
lockwashers from both brake
studs.
7. Remove the 10-32 allen-head
screw on the right side of brake.
8. Remove the tensioning screws at
the top center of the brake on
each side of the sheet metal
frame.
9. Remove the V-belt from the
plastic pulley by wedging a
screwdriver blade between the
belt and pulley while rotating the
brake slowly downward to work
the belt off the pulley. Take care
not to damage pulley.
10.Lift the brake upward to clear
frame and pull the speed sensor
bracket off the left brake stud.
Remove the brake from the
machine and set aside to return
to SCIFIT (request a UPS call tag
by phone).
11.Hoist the replacement brake
above the frame mounting slots
and wrap V-belt around brake
hub. Position V-belt hanging
behind the idler pulley.
12.Put the speed sensor bracket on
the left brake stud. Note: If old
brake has a smaller diameter (7”
vs. 9”) a replacement speed
sensor bracket must be used.
Remove the single screw holding
the speed sensor to the old
bracket and attach the sensor,

9
with the same orientation, to the
new bracket. Refer to Procedure
3, if needed.
13.Slide the brake studs and speed
sensor bracket inside and to the
bottom of the frame mounting
slots.
14.Connect the two red wires to the
brake.
15.Loosely attach the lockwashers
and nuts to the brake studs.
16.Rotate the stator of brake to align
the screw hole on the right side of
brake with sheet metal frame.
Loosely attach the 10-32 screw to
this hole.
17.Slip the V-belt over the plastic
pulley while slowly turning the
brake downward to install and
center the belt on the pulley.
18.Insert the left tensioner screw
and finger-tighten. Repeat this
process on the right side.
19.Tighten the left-side tensioner
screw with an allen wrench until
the angle brackets begin to bend
inward. Repeat this process on
the right.
20.Position the speed sensor
bracket vertically.
21.Snugly tighten the brake stud
nuts until the lock washers
compress. Do not over-tighten to
avoid breaking the studs.
22.Tighten the 10-32 screw on the
right side of brake.
23.Rotate the brake assembly to
verify the V-belt is centered in the
idler pulley. If misaligned, wedge
a screwdriver blade between the
face of the brake and the belt
while turning Assembly to align
belt to center of idler pulley.
24.Attach speed sensor tape to the
left edge of the brake armature.
First peel off tape backing on the
end with the wide silver band and
stick on the brake surface
hanging down. Slowly rotate the
brake upward and wrap tape
around the circumference of the
brake.
25.Perform the following steps 25
through 29 and perform the
alignment (Procedure 3), if
indicated results are not
attainable.
26.Plug in and turn on machine but
don’t press any buttons. The
display will be scrolling the
message, “SCIFIT…” Slowly
rotate the crank arm assembly
and the message will change to a
programming prompt. The
following values will be displayed:
[20.00] in TIME, [0] in RPM, and
[4] in LEVEL. If the display
doesn’t default to these values,
perform Procedure 3.
27.Press the START/STOP button
once and press the SCAN/HOLD
button to hold the RPM function.
Press and hold the DOWN
ADJUST arrow until 0.0 is
displayed in the LEVEL window.
28.Rotate the crank arms at one
revolution per second and ensure
display accurately reads about 60
RPM.
29.Press and hold the UP ADJUST
arrow button to the maximum,
level 22. Rotate the crank arms
as rapidly as possible. Brake
resistance should become
increasingly difficult momentarily.
30.Replace the covers and rails in
the reverse order of steps 1
through 4.

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Procedure 5 – Checking the Rail
Alignment
1. Remove the rear rail cover (item
85).
2. Check alignment of the guides
(item 58) on the rollers (item 40)
by moving the rail assemblies
(item 57) forwards and
backwards and making sure that
the rollers run in the flat center
section of the roller guides. If the
guides are not tracking correctly,
see Procedure 6.
Procedure 6 – Adjusting the Rail
Alignment
1. Remove both rail assemblies
(item 57).
2. Remove the left crank arm
(item50) and Woodruff key (item
102).
3. Remove the left and right side
covers (items 81 and 80,
respectively). Note: this may be
done without removing the right
crank arm.
4. Reinstall the left crank arm at the
same angle as the right crank
arm. Do not use the Woodruff
key when putting the crank arm
on. Secure the left crank with the
pinch bolts.
5. Reinstall the rail assemblies.
6. Partially loosen the nuts and bolts
holding the crank shaft bearings
(item 73) and flangettes (item
72). Leave enough tension on the
bolts to hold the bearings in
place, but will allow bearings to
be moved.
7. Check alignment of the roller
guides (item 58) on the rear
rollers (item 40). The flat section
of the roller guides should be
centered on each roller. If the
guides are not centered, grab the
ends of the rail assemblies and
move them sideways until the
guides are centered on the
rollers. The crank shaft bearings
and flangettes should move
slightly when the rail assemblies
are moved.
8. Retighten the crank shaft bearing
bolts and nuts in their new
position.
9. Check alignment of the guides on
the rollers by moving the rail
assemblies forwards and
backwards and making sure that
the rollers run in the flat center
section of the roller guides. If the
guides are not tracking correctly,
repeat steps 6-8 until satisfactory
alignment is achieved. Note: if
one or both rail assemblies
cannot be made to track on flat
center section of the roller guide,
there may be a problem with the
rail itself. If this is the case,
please contact SCIFIT Service at
800-745-1373. Also, check the
chain tension. The chain should
be tight enough to eliminate
backlash, but not so tight as to
bind and cause excessive noise.
10.Remove the rail assemblies.
11.Remove and reinstall the left
crank arm at a 180°orientation
from the right arm. Put removable
threadlocker (blue LOCTITE®)
on the pinch bolts and tighten.
12.Reinstall the side covers.
13.Reinstall the rail assemblies.

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IV. Figures
Figure 1 – SX1000 Main Frame

12
Figure 2 – SX1000 Total Assembly

13
Figure 3 – Power Entry Module with Fuse Holder

14
Figure 4 – SX1000 Wiring Diagram

15
Figure 5 – SX1000 Spindle Bearing Lubricant Application

16
V. SX1000 Parts List
Item Description Part No. Qty.
1 Console 65202 1
2 Display board 65110 1
3 overlay/switch panel 65112 1
4 heart rate pickup/cable, assy A1066 1
5 standoffs, 1", 6-32 P1051 6
6 screw, 6-32x.5 b.h. pltd. P1052 14
7 screws, 6-32x.250 f.h. pltd. P1053 1
8 mount, display, weldment B1020 1
9 bolts, 1/4-20 x 5/8 pltd. P1054 6
10 bolt, 5/16-18 x 1/2 pltd. P1057 22
11 lockwashers, 1/4 P1056 6
12 plate, side, drivetrain, right C1013 1
13 plate, side, drivetrain, left C1014 1
14 bolts, 5/16-18 x 5/8 pltd. 12
15 nuts, 5/16 -18 pltd. P1058 10
16 lockwashers, 5/16 P1059 34
17 grommet, hole, 1" dia., P1060 1
18 bracket, wheel, left A1015 1
19 bracket, wheel, right A1016 1
20 plate, power entry A1018 1
21 module, power entry P1061 1
22 module, outlet, power 65177 1
23 screw, 10-32x.5, black, b.h., socket cap P1062 18
24 wheel, front P1063 1
27 cable, ribbon, assy A1067 1
28 grip, 1 1/4 dia x 14" P1068 2
29 grip, 1 1/4 dia x 10" P1069 2
30 cover, electronics, lower A1017 1
31 plate, mounting, electronics, lower A1019 1
32 bracket, PCB, lower A1047 1
34 lockwasher, #8 4
35 screws, 8-32 x 1/2, pan head, pltd. 4
36 nuts, 10-32, pltd. P1073 4
37 lockwasher, #10, P1074 4
38 frame, base, weldment C1011 1
39 endcap, 3"dia 70330 4
40 roller, rail, urethane P1075 2
41 bearing, roller, rail, urethane P1128 4
42 washer, #10, flat 4
43 washer, #10, star 4
44 kit, bolt, roller, rail P1077 2

17
45 PCB, supply, power 65150 1
46 transformer, supply, power 65180 1
47 bolts, 5/16-18 x 2 1/2, hex, pltd. P1079 8
48 lockwasher, 5/16, black 8
49 1/4-20x1" Socket Cap 4
50 Crank, Machined, 205mm, assy. A1172 2
51 Bracket, mounting, pickup, heart-rate A1124 1
52 Bearing, flanged, 3/4 dia, 1/2 long, igus L280 A1180 4
53 Bearing, thrust, 3/4 dia, igus L280 P1179 2
54 ring, snap, 3/4 dia. 2
55 pedal, finished A1028 2
56 Shaft, spacer A1131 1
57 rail, weldment B1109 2
58 guide, roller, extruded A1110 2
59 bolt, 5/16-18 x 3 1/2P, button head, black P1086 8
60 cap, 2 1/4 x 2 1/4, plastic, black P1087 4
61 brake A1331 1
62 cover, pedal, right A1041 1
63 cover, pedal, left A1042 1
65 Bracket, sensor, speed, brake, large A1176 1
66 sensor, speed, cable, assy A1089 1
67 belt, poly-V P1090 1
68 idler P1091 1
69 washer, cover, plastic, black 55 11
70 screws, 8-32 x 3/8 f. h. pltd. 4
71 screws, 4-40 x 1/2 p.h. pltd. 1
72 flangette, bearing P1095 8
73 bearing, P1096 4
74 pulley, poly-V, 6" dia P1097 1
75 key, square, 1/4 x 1/4 x 1 P1098 1
76 shaft, jack, assy A1050 1
77 chain, 1/2 pitch, per foot P1072 2
78 Spindle, Crank, Assy. A1048 1
79 nut, jam, 5/16-18, pltd. P1099 8
80 cover, right P1036 1
81 cover, left P1035 1
82 Tape, pickup, speed, brake, large A1190 1
83 decal, Scifit P1100 4
84 decal, SX1000 P1101 1
85 cover, rail, rear, weldment A1022 1
86 decal, warning, hi voltage P1102 1
87 decal, serial number P1103 1
88 manual, operator's P1104 1

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89 cord, power, AC 65169 1
90 grommet, hole, 1 1/2 dia. P1105 3
91 support, cover A1033 1
92 decal, plate, scuff P1106 2
93 holder, bottle, water P1092 1
94 bracket, tension, upper A1116 2
95 bracket, tension, lower A1117 2
96 socket head, 10-32x2.5, flat, d.h., pltd. 2
97 bolt, 3/8-24 x 2 1/2 hex, pltd. 1
98 nuts, 3/8-24 1
99 lockwashers, 3/8 2
100 bolt, 3/8-16 x 1 1/2 hex, pltd. 1
101 nut, 3/8-16 1
102 Key, #806 (1/4x3/4), Woodruff 2
104 washer, #4, flat, pltd. 1
105 washer, #4, split, pltd. 1
106 Spacer, bearing, roller P1078 2