Technogym spin trainer Maintenance Manual page 26

Replace the display CPU
board: see paragraph 7.4.
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1) Perform the troubleshooting procedure described in paragraph 6.3. "The speed value is
incorrect".
(2) Place the tester probes between the orange (positive) and black (negative) cables on the
alternator. Select the "Manual Training" function on the display and start pedaling on the
machine. Vary the incline while maintaining the speed specified in Table 6.2-1: the excitation
voltage should vary as shown in the same table.
V = 13 Km/h
INCLINE
(%)
1
3
6
9
Note that the above voltages and frequencies are nominal values.
(3) As for point (2) but with the tester between pins 4 (positive) and 5 (negative) of connector
CN2 on the alternator interface board.
(4) Disconnect all the cables from the 2 power resistor terminals. Place the tester probes on the 2
terminals and measure the value of the resistance.
WARNING: Because all tester probes have a non zero internal resistance, which varies
depending on the model and may be in the same order as the quantity being measured,
the following procedure is recommended:
• Measure the internal resistance of the probes by short-circuiting them with each other;
• Measure the resistance of the power resistor. The true resistance value is obtained by
subtracting the short-circuit resistance of the probes from the measured value.
Page 6.6
NO
Is the control signal output by
the CPU board correct?
EXCITATION VOLTAGE
(VDC)
ALTERNATOR
4-5/CN2
0.61
4.65
7.60
10.39
Table 6.2-1
SPIN TRAINER: Service & Maintenance Manual - rev. 2.0
A
6
YES
WAVEFORM FREQUENCY
ALTERNATOR
INTERFACE BOARD
6-3/CN1
0.61 10
4.65 160
7.60 398
10.39 505
Replace cable SP-1
connecting the CPU
board to the alternator
interface board
(Hz)
CPU BOARD
6-3/CN1
10
160
398
505