BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 6.19
6.7. THE LCD DISPLAYS THE MESSAGE “HW FAULT: CHECK
FPGA”
This error message appears when the CPU board receives no signal from the Bio servo board, or
receives an incorrect signal.
HW FAULT: CHECK
FPGA
Replace the CPU board
Replace the Bio servo
board
Check whether the Bio servo
board sends signals to the
serial cable connected to the
CPU board
YES
NO
1
2
Check whether the CPU board
receives signals on the serial
cable connected to the Bio
servo board
Replace the BS-6/2
cable
Check whether the error signal
still appears on the LCD if the
CPU board is replaced
Replace the Bio servo
board
YES
NO
NO
YES
Follow the step-by-step guide to properly diagnose the error. Pay special attention to those tests
indicated in numbered boxes, and described in detail here below:
(1) Insert the oscilloscope probes between pins 12 and 1 of the CN7 connector on the Bio servo
board. With the time scale in 100 µsec, you should see the signal change from high to low.
(2) Insert the oscilloscope probes between pins 3 of the K3 connector and pin 1 of the K4
connector on the CPU board. With the time scale in 100 µsec, you should see the signal
change from high to low.
On Chest Press and Leg Press, the BS-6/2 cable is divided into 2 parts through the
connector CN36. Carry out the test on this connector and, if necessary, replace only the
defective section of the BS-6/2 cable.
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