SportsArt Fitness T621 Operating instructions

T621 Repair Manual (Electronics)

Table of Contents
1-1-1. Product Picture-T621
1-2-1. Display-T621
1-3-1. Component Placement-T621 Display
1-3-2. Component Placement-T621 Drive Board Area
1-4-1. Block Diagram-T621
1-5-1. Connections-T621 Display Board
1-5-2. Connections-T621 Bridge Board
1-5-3. Connections-T621 Drive Board
1-6-1. Indicator LEDs-T621 Display Board
1-6-2. Indicator LEDs-T621 Drive Board
1-7-1. Display Specifications-T621
2-1-1. Electronics Troubleshooting Chart-T621
3-1-1. Troubleshooting-Safety Key Malfunction-T621
3-2-1. Troubleshooting-Unit Will Not Start Operating-T621
3-3-1. Troubleshooting-Key Malfunction(Display)-T621
3-3-2. Troubleshooting-Key Malfunction-T621
3-4-1. Troubleshooting-Telemetry Heart Rate Malfunction-T621
3-5-1. Troubleshooting-Contact (HTR) Heart Rate Malfunction-T621
3-6-1. Troubleshooting-The Fuse Breaks at Start-T621
3-6-2. Troubleshooting-The Fuse Breaks at Motor Start-T621
3-6-3. Troubleshooting-The Fuse Breaks during Use-T621
3-7-1. Troubleshooting-ERR-1 T621
3-8-1. Troubleshooting-ERR-3 T621
3-9-1. Troubleshooting-ERR-7 T621
3-10-1. Troubleshooting- SERVICE REQUIRED …-T621
3-11-1. Other Information-Unit Settings and Information-T621
3-12-1. Other Information-SERVICE NEEDED…-T621

3-13-1. Other Information-Error Messages-T621
4-1-1. Inspecting and Testing-Transformer Test –T621
4-2-1. Inspecting and Testing-Motor Carbon brush –T621
4-3-1. Inspecting and Testing-wheel, speed sensor –T621
4-4-1. Inspecting and Testing-Motor voltage –T621
4-5-1. Inspecting and Testing-Motor Thermal Sensor Test-T621
4-6-1. Inspecting and Testing-Incline Zero Switch Test-T621
4-7-1. Inspecting and Testing-Incline Motor Voltage Test -T621

1-1. Product Picture-T621
1-1-1

1-2. Display-T621
1-2-1

1-3. Component Placement-T621 Display
1-3-1
Telemetry heart rate receiver board
Display board

1-3. Component Placement-T621 Display
1-3-2
HTR board
Bridge board
Soft keys
Safety key board

1-3. Component Placement –T621 Drive Board Area
1-3-3
Drive board
AC incline motor
Filter
DC motor
Speed sensor
Temperature sensor
Transformer

1-4. Block Diagram-T621
1-4-1
Display
board
Drive
board
Motor
Speed sensor
Temperature
sensor
Incline motor
Zero switch
Transformer
Filter
HTR board
Safety key
Polar board
Keypad
SW
FUSE
AC1
AC2
Bridge
board
Sensor L
Sensor R

1-5. Connections-T621 Display Board
1-5-1
To drive board
To bridge board (keypad)
To bridge board (safety key)
To bridge board (fan)
To bridge board (HTR)
To drive board
To bridge board
To telemetry HR

1-5. Connections-T621 Bridge Board
1-5-2
To safety key board
To HTR board
To display

1-5. Connections-T621 Drive Board
1-5-3
To incline motor
To filter
To motor
To speed sensor
To incline zero switch
To display
To motor temperature sensor

1-6. Indicator LEDs-T621 Display Board
1-6-1
HR indicator
Power indicator

Lit indicates display has
power.

1-6. Indicator LEDs-T621 Drive Board
1-6-2
Incline fuse
Transformer fuse
LED8 ZERO Indicator
Lit = incline is already
calibrated.
LED6 MC Indicator
Flashing indicates motor movement.
LED4 CUS_UP Indicator
Lit = Cushion motor is extended (firm).
LED11 I_SENSE Indicator

Lit = High current protective
function is activated.
LED3 CUS_DN Indicator
Lit = Cushion motor is retracted (soft).
LED2 POWER Indicator
Lit = Power is supplied.
LED10 Motor Thermal Switch Indicator
Lit = Motor is overheated; protective function is
activated.
LED1 SOFT Indicator
Lights automatically two
seconds after powering up.
LED5 EMG Indicator
Lit = There is voltage to the motor.
Not lit = Emergency stop switch is activated.
LED9 UP Indicator
Lit = Incline is operating up.
LED7 DN Indicator
Lit = Incline is operating down.

1-7. Display Specifications-T621
Specification
Details
Notes
Exterior power supply
110V / 220V
Motor
DC motor (with internal thermal switch)
Has brushes
Has heat protection
Speed sensor
Infrared optic sensor
Speed Range
KPH: 0.2 - 20.0(KPH)
MPH: 0.1 –12.0(MPH)
Incline Range
Power: AC motor (110V or 220V)
Incline range: 0 % -15 %
0% setting, time control
1% per 2 seconds
Display
LED＋16-segment＋7-segment LED＋dot matrix
Workout Programs
MANUAL, RANDOM, HILL, INTV, GLUTE,
Heart rate control
program
CARDIO, WT LOSS, ZONE TRAINER
Heart rate
HTR / Telemetry
1-7-1

2-1. Electronics Troubleshooting Chart-T621
Malfunction
Circumstance
Inspection and test points
Components to
replace
Notes
Safety key
malfunction
Put safety key in place.
Display has no reaction.
“Safety key” appears on the
display.
1. Inspect the cable connections on the lower part of the
display and safety key.
2. Inspect the safety key magnet.
3. Inspect the safety key board.
Safety key board
No start up
Power on, indicator does
not light.
1. Inspect the power cord connection.
2. Inspect all cable connections.
3. Inspect the fuse, the fuse holder, and the power switch.
4. Drive board components have an electrical short.
Replace the drive board.
1. Fuse, fuse holder
2. Drive board
No start up
Power on, indicator lights
but the display does not
light.
1. Inspect all cable connections, including connector
cables.
2. Inspect whether drive board LED2 lights:
a. If LED2 lights, inspect and test the transformer fuse.
3. Inspect whether LED1 on the display lights.
a. If LED1 does not light, inspect the data cable from the
display to the drive board.
b. If LED1 does light, inspect the display program IC.
Re-install the display IC.
1. Transformer
2. Drive board
3. Display board
program IC
Telemetry heart
rate malfunction
Telemetry heart rate
malfunction
1. Inspect the heart rate transmitter strap and its
batteries. Replace batteries if they have not been
replaced recently.
2. Inspect the receiver board cables.
3. Test or replace the receiver board.
4. Inspect for environmental interference, for example,
from speakers and lights.
1. Heart rate
transmitter
2. Heart rate
receiver board
Contact heart
rate malfunction
Contact heart rate
malfunction
1. Inspect the HTR wire connections on the bridge board.
2. Inspect the HTR indicator light.
3. Replace the HTR board.
1. HTR board
(HTR=heart touch
rate = contact heart
rate)
2-1-1

Soft key
malfunction
(display)
Press soft key, display no rebound,
1. Replace the display soft key.
Soft key
(display)
Soft key
malfunction
Key does not operate,
or operates continually.
1. Inspect the bridge board soft key connection.
2. Replace the soft key.
Soft key
ERR 1
Motor does not rotate, ERR1
appears.
1. There is no power to the motor; the motor
cannot operate.
2. Inspect the motor brushes.
3. Measure voltage from the drive board
to the motor. If there is no voltage, replace the
drive board. If there is voltage, inspect the
following:
a. transformer voltage
b. whether the EMG indicator lights
c. whether IGBTs have an electrical
short. If so, replace the drive board.
4. Inspect the motor brushes and the
commutator.
1. Drive board
2. Motor brushes,
commutator
ERR 1
Motor rotate, ERR1 appears,
1. The program did not detect the optic sensor
signal.
2. Inspect the CLK indicator on the drive board.
If the CLK indicator is not lit, clean or replace the
speed sensor. If the CLK indicator lights
normally, inspect the data cable from the display
to the drive board. Re-install the display program
IC. Re-install the display IC.
Speed sensor
ERR 3
Display speed differs from actual
speed.
1. Inspect the KPH/MPH setting.
2. Inspect teeth on the optic wheel.
3. Replace the speed sensor.
4. Replace the drive board.
1. Speed sensor
2. Drive board
ERR 7
ERR7 appears at startup.
1. Inspect the incline cable connections.
2. Inspect whether incline has calibrated.
1. Zero calibration
switch
2. Drive board
2-1-2

KPH/MPH setting
1. Press the <CHANGE> key three seconds;
the display will show
“UNIT-MPH” or “UNIT-KPH”.
2. Press INCLINE<▲>/<▼> to select KPH or
MPH. Press <ENTER> to confirm your choice.
FOR ACCURATE HR ,
HOLD SENSORS
FIRMLY WHILE
WALKING
FOR ACCURATE HR ,
HOLD SENSORS FIRMLY
WHILE WALKING
1. Hold contact heart rate grips firmly to test the
HTR function.
2. If you are already holding grips firmly, inspect
the HTR contact wire connections.
SERVICE REQUIRED
TREADMILL SHUTTING
DOWN STOPPING
Display shows
“SERVICE REQUIRED
TREADMILL SHUTTING
DOWN STOPPING”
1. Motor thermal protection unit is activated.
Let the unit rest half an hour or more to cool.
2. If this message often appears, please
inspect the treadmill walk belt and deck.
Lubricate if necessary.
3. If the walk belt is worn, replace the walk
belt.
SERVICE
NEEDED-APPLY LUBE
SERVICE
NEEDED-APPLY LUBE
1. This lubrication prompt appears every 4000
KM. Follow lubrication and maintenance
procedures in the owner’s manual.
2. Enter lubrication procedure INCLINE <▲>
+ INCLINE<▼>+<0>.
View total distance, total
time
1. Press and hold the INCLINE <▲> +
INCLINE<▼> + <STOP> keys for 2 seconds.
2. The display will show the total distance and
total time
2-1-3

Troubleshooting
Model: T621
Malfunction: Safety key malfunction
Circumstance: Put the safety key in place. The display
does not operate. Display shows “safety key”.
Possible cause: Safety key board malfunction
Troubleshooting: 1. Inspect the safety key magnet.
2. Inspect the bridge board cable connections.
3. Test or replace the safety key board.
3-1-1
Display
board
Bridge
board
Safety key
board
Bridge board
Safety key connection
Safety key & safety key board
Safety key(reed switch test)
With safety key
Reed switch ON
Without safety key
Reed switch 
OFF
Reed switch

Troubleshooting
Model: T621
Malfunction: Unit does not operate
Circumstance: Turn on unit power; the power indicator does not light.
Possible cause: Inadequate incoming power supply or component malfunction.
Troubleshooting: 1. Inspect the power cable connection.
2. Inspect cable connections under the motor cover.
3. Inspect the main fuse, fuse holder, and the power switch.
4. Inspect drive board components for signs of burning. Or replace the drive board as a test.
3-2-1
Drive
board
Display
board
Filter
SW
FUSE
AC1
AC2
Drive board
Fuse, fuse holder, switch