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Nautilus® TreadClimber®, Model TC916 Service Manual
ELECTRONIC TROUBLESHOOTING SUMMARY
1. LED
Operation on
PCBAs
What this means First Action Second Action Third Action Fourth Action
DS2 On Continuous Walkbelt Over current
Condition.
This error is usually caused by excessive
drag or friction on the deck. Closely inspect
the deck and look for signs of excessive
wear. If needed replace the belt and deck.
Power off/on
treadmill, see
if problem self-
clears. Check
for unplugged or
damaged cables.
Replace VSD
PCBA.
Replace Drive Motor.
DS3 On Continuous 5V VCC Power Supply is
Operational.
Normal condition, no action required.
DS3 Off 5V VCC Power Supply is Non-
operational.
Check for unplugged or damaged cables.
Cable going to P14 on VSD PCBA is most
likely to cause problem.
Use an ohmmeter
to verify Config
PCBA fuses F3 and
F4.
Replace VSD
PCBA.
Replace Configuration
Plate.
DS4 On Continuous 15V Predrive Power Supply is
Operational.
Normal condition, no action required.
DS4 Off 15V Predrive Power Supply is
Non-operational.
Check for unplugged or damaged cables.
Cable going to P20 on VSD PCBA is most
likely to cause problem.
Use an ohmmeter
to verify Config
PCBA fuses F3 and
F4.
Replace VSD
PCBA.
Replace Configuration
Plate.
DS5 On Very Bright Danger! High Voltage Drive
Bus Voltage Present.
Normal powered up condition. Do not handle
VSD PCBA until LEDs go out after about 2
minutes.
DS5 Off High Voltage Drive Bus
Capacitors have Discharged.
High Voltage Drive Bus is discharged and
VSD PCBA is safe to handle.
DS6 On Very Bright Danger! High Voltage Drive
Bus Voltage Present.
Normal powered up condition. Do not handle
VSD PCBA until LEDs go out after about 2
minutes.
DS6 Off High Voltage Drive Bus
Capacitors have Discharged.
High Voltage Drive Bus is discharged and
VSD PCBA is safe to handle.
2. Self-Test
Error Codes
What this means First Action Second Action Third Action Fourth Action
ALU Error
Program Error
Static RAM Error
Timer Error
Internally generated processor
error.
Power off/on treadmill, see if problem self-
clears.
Replace P51
Processor PCBA.
EEPROM Error Stored data such as user
preferences, total time, and
mileage has been corrupted.
Power off/on treadmill, see if problem self-
clears. Defaults and configuration data will
need to be entered again.
Replace P51
Processor PCBA.
