SportsArt Fitness S770 Operating instructions

S770 Electronic Repair Manual

S770 Electronic Repair Manual Contents
1-1-1. Full Unit Picture - S770
1-2-1. Overlay - S770
1-3-1. Component Placement - S770 Display
1-3-2. Component Placement - S770 Lower Body
1-4-1. Block Diagram of Electronic Components - S770
1-5-1. Cable Connections - S770 Display Board
1-5-2. Cable Connections - S770 Drive Board
1-6-1. LED Indicators - S770 Display Board
1-6-2. LED Indicators - S770 Drive Board
1-7-1. Electronic Specification Chart – S770
2-1-1. Electronic Malfunction Troubleshooting Chart - S770
3-1-1. No Start Up – Alternator - S770
3-2-1. No Start Up (Battery) - S770
3-3-1. No Step Value - S770
3-4-1. No Resistance - S770
3-5-1. Resistance is Too Strong - S770
3-6-1. Wireless (Telemetry) Heart Rate Malfunction - S770
3-7-1. Contact Heart Rate (HTR) Malfunction - S770
3-8-1. Key Malfunction - S770 Soft Keys
3-8-2. Key Malfunction - S770 Key Switches
3-8-3. Key Malfunction - S770 Handle Keys
3-9-1. No Fan Operation - S770
3-10-1. Battery Does Not Recharge – S770
3-11-1. Other – Basic Parameter Setting: KPH/MPH, total distance, total time, display board IC

1-1. Full Unit Picture - S770
1-1-1

1-2. Overlay - S770
1-2-1
1-2-1

1-3. Component Placement - S770 Display
1-3-1
HR receiver (telemetry
heart rate)
HTR board
(contact heart
rate)
Display board
Cardio board
Fan

1-3. Component Placement - S770 Lower Body
1-3-2
Electro-magnet
Drive board
Flywheel
Battery
Optic sensor
Alternator
CSAFE board

1-4. Block Diagram of Electronic Components
1-4-1
Display
Board
Drive
Board
Electro-magnet
Optic sensor
Battery
HTR board
Key pad
Sensor – L
Sensor – R
Alternator
Fan
Keys on handle
HR receiver brd
Cardio/USB brd
Battery charger
CSAFE board

1-5. Cable Connections - S770 Display Board
1-5-1
Connects to telemetry heart rate receiver
Connects to fan
Connects to cardio board
Connects to drive board
Connects to HTR board
Connects to keys on handle
Cardio (USB)
Connects to case board
Connects to CSAFE board
Connects to display board

1-5. Cable Connections - S770 Drive Board
1-5-2
Connects to display board
Connects to battery
Connects to electro-magnet
Connects to alternator and battery charger
Connects to optic
sensor

1-6. LED Indicators - S770 Display Board
1-6-1
Power LED 2
Lit indicates there is
incoming power supply.
CSAFE LED
Flashing indicates
there is CSAFE signal
transmission.
Main program IC

1-6. LEDs Indicators - S770 Drive Board
1-6-2
Alternator fuse 2A
Battery fuse 2A
CLK signal indicator LED
LED flashes when optic
sensor detects movement.
Battery charge LED
Lit indicates drive
board is emitting
power to charge the
battery.

1-7. S770 Electronic Specification Chart
Item Specification Notes
Power AC alternator
Backup power Battery 6.4 VA
Can recharge through product use or exterior battery charger
Resistance Electro-magnet control
Speed Sensor Infrared detection / Alternator circuit detection
Resistance range LEVEL 1 - LEVEL 20
LEVEL 1, specification current 0A
LEVEL 20, specification current 1.0A
Display method Dot matrix and numeric LEDs
Main window Dot matrix
Secondary windows
65% HR TARGET, Heart rate , 80% HR TARGET
CALORIES / DISTANCE / TIME / STEPS
CAL/HR / METS / WATTS / SPEED
Workout programs MANUAL / INTERVAL / WT LOSS MOUNTAIN / FAT BURN / CARDIO
PLATEAU / FIT TEST / CUSTOMER HR
Heart rate control
program WT LOSS, FAT BURN, CUSTOMER HR
Heart rate Wireless heart rate (telemetry)／contact heart rate (HTR)
Fan High, medium, low, stop – four segments
Output interface CSAFE
Other
1. If there is no movement for 15
seconds, unit enters power saving
mode. If there is no movemen
t for two seconds, unit automatically
turns off.
2. Handles have level keys.
1-7-1

2-1. Electronic Malfunction Troubleshooting Chart - S770
Malfunction Circumstance Points for inspection and testing Components
to replace Notes
No start
(Alternator) Display is not lit; Exercise on unit; display shows no
reaction and does not light
up.
1. Inspect all cable connections.
2. Inspect alternator belt tracking.
3. Inspect drive board fuse.
4. Inspect drive board CLK indicator.
5. Inspect the display power supply indicator.
1. drive
board fuse
2. drive
board
3. alternator
No start
(Battery) Display does not light when the exerciser stops
exercising.
1. Inspect all cable connections.
2. Inspect the battery fuse on the drive board.
3. Measure battery voltage. Battery voltage should
be 5.3V or more.
4. If battery voltage is under 5.5V, exercise on the
unit at 50 steps per minute or faster to replenish
the battery.
5. If battery voltage is under 2.0 and there is no way
to recharge the battery, replace the battery.
1. battery
fuse on
the drive
board
2. battery
No step
count Start exercising on the unit; the display shows no
reaction; values on the
display do not change.
1. Speed sensor signal allows the display to
determine unit usage.
2. Alternator current is transformed directly on the
drive board to become the CLK signal for the
detection of speed.
3. Inspect whether the alternator belt is out of place.
The steps signal comes from the alternator rather
than the speed sensor.
4. Inspect all cable connections and the bridge
board.
5. Replace the drive board as a test.
6. Inspect the display IC pin connections.
1. speed
sensor
2-1-1

2-1. Electronic Malfunction Troubleshooting Chart - S770, (Continued)
No
resistance Exercise on the unit; press resistance up or down keys;
resistance values change on
the display; but there is no
resistance.
1. Inspect all cable connections.
2. Inspect the STEP value. Does it change? If there
is no STEP signal, there will be no resistance.
3. Inspect whether the alternator will turn on the
unit. If the alternator cannot turn on the unit, there
will be no resistance.
4. Inspect the electro-magnet and its cable
connections.
5. Inspect the electro-magnet voltage from the drive
board. LEVEL 1 current specification: 0A; Level20
current specification 1.0A. Often, this issue relates
to the drive board.
1. drive
board
Wireless
(telemetry)
heart rate
malfunction
Wireless (telemetry) heart
rate malfunction 1. Inspect the heart rate transmitter and its battery. Replace the battery if necessary.
2. Inspect the telemetry heart rate receiver board.
3. Test or replace the heart rate receiver board.
4. Inspect for environmental interference, such as
speakers and lights.
1. heart rate
transmitter
2. heart rate
receiver
Contact
heart rate
(HTR)
malfunction
Contact heart rate (HTR)
malfunction 1. Inspect the HTR cable connection on the bridge board.
2. Inspect the HTR LED indicators.
3. Replace the HTR board.
Key
malfunction Key does not operate or operates continuously. 1. Replace key switches on the display. display key switch
Key
malfunction Press keys on left side of the display; keys do not operate.
1. Replace soft keys. soft key
switch
Key
malfunction Press keys on handles; display shows no reaction. 1. Inspect the cable connection on the handle keys.
2. Replace the handle keys. handle key switch
2-1-2

2-1. Electronic Malfunction Troubleshooting Chart - S770, (Continued)
No fan
function Press fan keys; fan does not operate. 1. Inspect the cables on the display board. 2. Inspect output voltage to the fan. Replace the
display board if there is no power to the fan.
display
Excessive
resistance Exercise on the unit; resistance is excessive. 1. Inspect all cable connections. Inspect whether screws have pierced cables.
2. Rotate the flywheel with your hand. Inspect
whether the electro-magnet scrapes the flywheel.
3. Inspect whether drive board components have an
electrical short, sending maximum voltage to the
flywheel, making excessive resistance.
1. drive
board
Battery does
not recharge
Battery has no power.
Exercise on the unit. Battery
voltage does not recharge.
Exterior battery charger also
fails to replenish the battery.
1. Inspect battery voltage. If battery voltage is below
2.5V, replace the battery.
2. Exercise on the unit at 50 steps per minute or
faster to recharge the battery.
3. Inspect whether the battery charge LED lights
when someone exercises on the unit.
4. Inspect the drive board fuse.
5. Replace the drive board.
1. battery
2. drive
board
KPH/MPH
selection 1. Press the <ENTER> key for three seconds. Follow prompts to change KPH/MPH setting.
2. Inspect the total distance/time/display board.
Power
saving mode
1. Do not press any key. Stop exercising on the
product. In 15 seconds, the energy saving mode
begins. The display shows “────＂.
Automatic
shut off Do not exercise on the unit for two seconds. The display automatically shuts off.
Manual shut
off 1.SPEED=0. Press the＜FAN> key three seconds.
The unit shuts off.
2-1-3

Troubleshooting
Model: S770
Malfunction: No start up (alternator)
Circumstance: Exercise on the unit. The display does not light.
Possible cause: 1. Poor cable connections
2. Malfunctioning drive board
Troubleshooting: 1. Inspect all cable connections.
2. Inspect alternator belt tracking and cable connections.
3. Inspect the alternator fuse 2Aon the drive board.
4. Inspect whether the CLK indicator on the drive board flashes.
5. Replace the drive board as a test.
6. Inspect whether the LED2 power supply indicator lights on
the display board. Lit is normal. Inspect the display IC.
Not lit indicates the drive board is malfunctioning. Replace it.
3-1-1
Drive
board
Display
board
LED2
Alternator
Inspect display IC pin connections.
Alternator 2A fuse
The CLK indicator flashes when
the flywheel moves.
LED2: lit indicates
incoming power supply.
Inspect the alternator belt.

Troubleshooting
Model: S770
Malfunction: No start up (battery)
Circumstance: Stop exercising; display shuts off immediately.
Possible cause: 1. Cables are not connected properly.
2. Battery voltage is too low.
Troubleshooting: 1. Inspect cable connections, including adapter cables.
2. Measure battery voltage. Normal: above 5.3 VDC.
3. Inspect the battery fuse on the drive board.
4. If the battery voltage is below 5.5V, exercise on the product at
50 steps per minute or more to recharge the battery.
3-2-1
Drive
board
Display
board
Battery
F3 保險絲
PWR電源燈
檢查程式 IC
Battery voltage should
be above 5.3
VDC.
Battery fuse
LED2 lights to indicate
incoming power.

Troubleshooting
Model: S770
Malfunction: No STEP value
Circumstance: 1. No STEP value appears on the display.
2. Exercise on the unit. The display shows no reaction.
Possible causes: 1. Alternator belt is off track. There is no power production.
Notes: The optic sensor only provides a motion start/stop signal to the display IC.
The speed signal comes directly from the drive board’s processing of the
alternator signal, not from the optic sensor.
2. The drive board is malfunctioning.
Troubleshooting: 1. Inspect alternator belt tracking.
2. Inspect the optic sensor and its reflective sticker for dirt. Clean it.
3. Inspect the alternator fuse or replace the drive board.
3-3-1
Drive
board
Display
board
Alternator
Optic
sensor
Inspect optic
sensor signal.
Inspect the
alternator belt.
Inspect the
alternator fuse.
Inspect the optic sensor
and its sticker.
Distance should be 3mm.

Troubleshooting
Model: S770
Malfunction: No resistance
Circumstance: Exercise on the unit. There is no resistance.
Notes: 1. There must first be power from the alternator, plus the optic sensor
signal before the display will emit the resistance signal to the drive board
before the drive board will emit voltage to the electro-magnet.
Troubleshooting: 1. Inspect the cable connections.
2. Inspect the alternator fuse on the drive board and the alternator.
3. Inspect the CLK indicator on the drive board.
4. Inspect the display STEP value for change.
5. Measure current from the drive board to the electro-magnet.
Level 1=0A, LEVEL 20 =1.0A
3-4-1
Drive board
Display board
Alternator
Optic sensor
Electro-
magnet
Inspect the alternator
belt.
Inspect the alternator fuse.
Inspect the optic
sensor and the CLK
indicator on the drive
board.
Inspect cable
connections.
Current specification:
Level 1 =0A,
Level 20=1.0A

Troubleshooting
Model: S770
Malfunction: Resistance is too strong.
Circumstance: Exercise on the unit. Resistance is too heavy.
Possible cause: 1. Inspect cables for an electrical short.
2. Drive board components have an electrical short.
3. Display is frozen.
Troubleshooting: 1. Inspect all cable connections. Inspect cable insulation for tears.
2. Inspect IGBTs for an electrical short.
3. Replace the drive board.
3-5-1
Drive
board
Display board
Electro-
magnet
Inspect IGBTs for an electrical short.