SCIFIT TC1000 Series User manual

TC1000
Service Manual
SALES: 800-278-3933
CUSTOMER SERVICE: 800-745-1373

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Table of Contents
Section Page
I.Overview 2
II. Troubleshooting Tables 3
III. Maintenance Procedures
Procedure 1 – Removal and Reinstallation of
the Power Supply Board 6
Procedure 2 – Checking Voltage at the
Power Supply Board 6
Procedure 3 – Checking and Adjusting the
Speed Sensor 7
Procedure 4 – Removal and Replacement of
the Brake Assembly 7
IV. Figures
Figure 1 – TC1000 Total Assembly (Items 1-20) 9
Figure 2 – TC1000 Main Frame (Items 21-43) 10
Figure 3 – Power Entry Module with
Fuse Holder 11
Figure 4 – TC1000 Wiring Diagram 12
V. TC1000 Parts List 13

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I. Overview
Purpose.
This manual is designed to assist in service of SCIFIT TC1000 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 CST 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
1.1 The machine appears to
be off when plugged in
and switched “on”.
Faulty power supply
board (Item 23).
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.
1.2 Upper control panel
(Item 2) lights are dim.
Power supply board
(Item 23) is faulty. Replace power supply board. See Procedure 1.
1.3 Upper board (Item 2)
accepts commands but
rotational resistance
does not change.
Dip switch setting is
incorrect.
Power supply board
(Item 23) is faulty.
Set dip switch to 01.
Check and replace power supply
board as needed. See Procedure 2.
1.4 LED’s on upper board
(Item 2) blinking off/on,
then go dead.
Ribbon cable (Item 5)
connections are loose.
Faulty power supply
board (Item 23).
Display board (Item 2) 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.
1.5 Heart rate displays zero
(0) in window Chest strap and trans-
mitter improperly worn.
Loose sensor lead
connection at display
board (Item 2).
Faulty receiver.
Verify that they are being properly
worn.
Check and adjust as needed.
If there is no audible signal, replace
receiver.
1.6 Unit keeps blowing
fuses.
Too many units are
daisy-chained together.
Faulty power supply
board (Item 23).
Do not daisy chain more than 3
units together.
Check and replace power supply
board as needed. See Procedure 2.

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1.7 The upper display (Item
2) resets after starting a
program.
Ribbon cable connection
is loose (Item 5).
Power cord is loose.
Display board is faulty.
Check cable connection at power
supply and display boards (Items 23
and 2, respectively).
Check and adjust as needed.
Replace display board.
1.8 Program stops, lines of
dots shoot across
screen.
Ribbon cable (Item 5)
connection is loose.
Display board (Item 2) is
faulty.
Check and adjust cable connection
as needed.
Replace display board.
1.9 Machine shuts down in
programs but works in
manual.
Display board (Item 2) is
faulty. Replace display board.
1.10 Can’t select program
or enter information and
no beep when buttons
are pressed.
Overlay/switch panel
(Item 1) is faulty. Replace overlay/switch panel.

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Table 2 – Mechanical Troubleshooting
Problem Possible Reasons Solutions
2.1 Pedals lock up while
operating. Power supply board
(Item 23) is faulty.
Brake (Item 30) is faulty.
Unplug power cord. If pedals now
move freely, replace power supply
board.
If pedals do not move with power
cord unplugged, replace brake. See
Procedure 4.
2.2 No resistance on pedals
when in a program. No speed signal
Wires going to brake
(Item 30) are discon-
nected.
Power supply board
(Item 23) is faulty.
Check and adjust the speed sensor
(Item 37) as needed. See
Procedure 3.
Check that brake wires are properly
connected.
Check and replace power supply
board as needed. See Procedure 2.
2.3 Very little resistance at
any level. Speed sensor (Item 37)
improperly adjusted.
Bad speed sensor
connection with power
supply board (Item 23).
Check and adjust the speed sensor
as needed. See Procedure 3.
Check voltage at power supply
board. See Procedure 2.

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III. Maintenance Procedures
Procedure 1 - Removal and
Reinstallation of the Power Supply
Board
1. Unplug the unit from the power
source.
2. Remove the screws (Item 17)
that fasten the covers (Items 10
and 16) to the main frame. The
covers can be removed now.
3. Locate the power supply cover
(Item 22) on unit. Remove the
four (4) screws and the power
supply cover. Be careful when
removing the power supply cover
because of the plastic ties and
brake wires.
4. Cut all the plastic ties.
5. Before disconnecting any of the
wires, make note of the wiring
sequence. Refer to the wiring
diagram, Fig. 4.
6. 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. The power supply board (Item
23) 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. Press SCAN/HOLD so that
the CLIMB RATE indicator
light stays lit.
e. Move the pedals as if
exercising.
f. Verify that the values are
increasing in the CLIMB
RATE window.
g. Press the down arrow key to
slow the pedal speed. It
should be slow and smooth. If
not, consult the trouble-
shooting table.
h. Press the up arrow key to
increase pedal speed. The
stepping motion should be
fast and smooth. If not, refer
to the troubleshooting table.
Procedure 2 - Checking voltage at
the Power Supply Board
1. Follow steps 1-3 in Procedure 1.
2. Disconnect the speed sensor
from the lower supply board at
the J5 terminal. See Fig. 4. 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.

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3. If there is no voltage, replace the
power supply board. See
Procedure 1.
Procedure 3 – Checking and
Adjusting the Speed Sensor
1. Turn machine on and press
START/STOP.
2. Set the LEVEL to 0.0. Stand on
the two pedals until they go down
as far as they will go. The
number in the DISTANCE
window should increase every
time the pedals are pressed
down.
3. If the number in the DISTANCE
window does not increase each
time the pedal is depressed,
proceed to the next step to adjust
the speed sensor.
4. Remove the covers on the
machine (Items 10 and 16).
Locate the speed sensor on the
unit (Item 37).
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. Again, stand on the two pedals
until they go down as far as they
will go. If the number in the
DISTANCE window is greater
than zero but does not increase
by one, repeat steps 1-7. If a
reading of zero (0) is displayed,
proceed to step 8.
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 (Item 23). If
4-5 volts are present, replace the
speed sensor.
Procedure 4 – Removal and
Replacement of the Brake
Assembly
1. Remove the screws (Item 17)
that fasten the covers (Items 10
and 16) to the main frame. The
covers can be removed now.
2. Tip the entire unit back so that it
is resting horizontally on its two
rectangular shaped feet and the
two pedals. This will allow better
access to the brake from the
underside of the unit.
3. Disconnect the two red wires on
the right side of brake (Item 30).
4. Relieve the tension in the brake
drive belt (Item 42) by loosening
the turnbuckles (Item 29) that are
attached to the brake brackets.
5. Remove the nuts and threaded
bar that hold the brake drive idler
(Item 25) onto the bracket. Also,
loosen the nuts at the lower end
of the brake brackets. With the
idler removed and the brackets
loose, the brake should be loose
enough to remove the belt.
6. Remove the three (3) socket
head screws that hold the brake
assembly to the support bracket.
7. Pull brake away from main frame.
Be careful not to damage the
speed sensor when removing the
brake.
8. Remove the brake from the
machine and set aside to return

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to SCIFIT (request a UPS call tag
by phone).
9. Reinstallation is the reverse of
removal. Before tightening the
tension in the brake drive belt,
make sure that it is centered
correctly.
10.After brake assembly has been
aligned and tension set, attach
speed sensor tape to the brake
armature. First peel off tape
backing on the end with the wide
silver band and stick on the brake
surface hanging down. The tape
should be on center with the
speed sensor. Slowly rotate the
brake upward and wrap tape
around the circumference of the
brake. It is extremely important
that the speed sensor be
centered over the tape.
11.Stand unit up in its proper
position. Perform steps 12-16. If
the indicated results are not
attainable, see Procedure 3.
12.Plug in and turn on machine but
don’t press any buttons. The
display will be scrolling the
message, “SCIFIT…”
13.Press the START/STOP button.
14.If the LEVEL light is not lit, press
the SCAN/HOLD button until it
becomes lit. Use the down arrow
key to set the LEVEL to 0.0.
15.Stand on the two pedals
simultaneously so that they move
once through their entire range of
motion. The TOTAL CLIMB
window should display 1. If it
does proceed to step 16;
otherwise, check that the air gap
between the speed sensor and
brake flywheel is 1/8”-3/16” then
repeat steps 14 and 15.
16.Use the UP arrow button to set
the LEVEL to 4.0.
17.Stand on the pedals and begin
moving them at a rate typical of a
workout.
18.The resistance on the pedals
should feel smooth and
consistent. If it does, installation
is complete; otherwise, see
Procedure 3.

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IV. Figures
Figure 1 – TC1000 Total Assembly (Items 1-20)
Figure 2 – TC1000 Main Frame (Items 21-43)

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Figure 3 – Power Entry Module with Fuse Holder

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Figure 4 – TC1000 Wiring Diagram

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V. TC1000 Parts List
Item Description Part No. Qty.
1 overlay/switch panel 65112 1
2 Display board 65110 1
3 Console 65202 1
4 Handgrip set, TC1000 P1368 1
5 cable, ribbon, assy 65120 1
6 Pulley, clutch, roller, assy. P1375 2
7 Ring, retainer 2
8 Arm, pedal, upper P1376 2
9 Cap, base, 3", adjustable 70330 2
10 Cover, right, TC1000 P1362 1
11 Bolt, M10x1.5x70 2
12 Bearing, roller, 6200-2z P1389 8
13 Spacer, arm, upper P1390 4
14 Cap, base, rectangular P1377 2
15 Pad, foot, rubber P1378 2
16 Cover, left, TC1000 P1363 1
17 Screw, fastener, hood, TC1000 P1369 8
18 Belt, pedal, TC1000 P1366 2
19 Bracket, heartrate A1124 1
20 Board, heartrate, PCB 65160 1
21 Bracket, spring P1379 1
22 Cover, PSB, TC1000 P1380 1
23 Power supply, (lower), serial 65150S 1
24 Transformer, 24V, 5.4A 65180 1
25 Idler, brake drive, TC1000 P1381 1
26 Recept, PEM, Daisychain 65177 1
27 Module, power entry, RF/EFI 65178 1
28 Wheel, TC1000 P1382 2
29 Turnbuckle P1383 2
30 Brake, assy. 68300 1
31 Roller, belt, pedal, TC1000 P1393 2
32 Spacer, roller, TC1000 P1394 2
33 Bearing, roller, 608-2SR P1395 4
34 Arm, pedal, lower P1384 2
35 Bearing, roller, 6202-2z P1391 8
36 Spacer, arm, lower P1392 4
37 Sensor, speed, cable, assy. A1089 1
38 Shaft, F0.59x10.718 P1385 1

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39 Stopper, rubber P1386 2
40 Shaft, drive, main, assy. P1387 1
41 Flywheel, TC1000 P1388 1
42 Belt, drive, brake, TC1000 P1367 1
43 Spring, return, pedal, TC1000 P1365 2