SPAZIO FORMA: Service & Maintenance manual - rev. 1.0
Page 6.34
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:
If it is not possible to perform the following operations with the “↑
↑↑
↑” “↓
↓↓
↓” keys directly,
do so when the machine does the reset at the start up described at paragraph 3.3.2. “The
reset procedure”.
(1) Place the tester probes between pins 5 (signal) and 12 (ground) of connector K4 on the CPU
board. Press the “↑” key: the measured value should be 4.65 Vdc. Place the tester probes
between pins 3 (signal) and 12 (ground) of connector K4 on the CPU board. Press the “↓”
key: the measured value should be approximately 4.65 Vdc.
(2) Place the tester probes between pins 2 (signal) and 12 (ground) of portable connector CN28.
Press the “↑” key: the measured value should be approximately 4.65 Vdc. Place the tester
probes between pins 1 (signal) and 12 (ground) of portable connector CN28. Press the “↓”
key: the measured value should be approximately 4.65 Vdc.
(3) Place the tester probes between pins 5 (signal) and 12 (ground) of connector J6 on the driver
board. Press the “↑” key: the measured voltage should be 4.65 Vdc. Place the tester probes
between pins 3 (signal) and 12 (ground) of connector J6 on the driver board. Press the “↓”
key: the measured value should be approximately 4.65 Vdc.
(4) Check that there are no visible scorch marks, and that the travel of the moving parts is not
obstructed.
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