INFORMATION: Damaged Optocouplers can be purchased from one of the following suppliers, please click the link below to directly jump to the part order page:
Remove any wire connected to the input you want to test
Go to the F1 screen and observe the logic state of the suspected input. It will show either HIGH orLOW depending on whether the input is inverted or not.
Test the optocoupler by connecting the +ve of the MASSO power supply through a 5.6K resistor to the input you want to test.
On the F1 screen you should see the input change from LOW to HIGH or from HIGHto LOW.
If the input changes from one state to the other the optocoupler is ok and does not need replacing.
If the input does not change you can replace it using the replacement process at the bottom of this page.
If replacing the Optocoupler does not work you can use the advanced test procedure for the Optocoupler found >>HERE<<
Testing procedure for Spindle Encoder Inputs
Remove any wires connected to the Encoder inputs.
Go to the F1 screen.
Test the optocoupler by connecting the +ve of the MASSO power supply through a 5.6K resistor to the chosen encoder input.
Encoder-A input you will see the Signal-A input of MASSO change from LOW to HIGH.
Encoder-B input you will see the Signal-B input of MASSO change from LOW to HIGH.
Encoder-Z input you will see the Index input of MASSO change from LOW to HIGH.
If the input changes from one state to the other the optocoupler is ok and does not need replacing.
If one is faulty only replace that optocoupler
Testing procedure for MPG Inputs
Go to the F1 Screen.
Using your Pendant rotate the Manual pulse Generator, (MPG), and you will see the MPG-A and MPG-B flicker between HIGH and LOW randomly. If you see them flicker the Optocouplers are ok and do not need replacing.
Use the Pendant Axis selector switch and rotate through Axis X, Y, Z, A & B and you will see the corresponding Axis select input change from LOW to HIGH as each is selected. If the inputs change they do not need replacing. If one is faulty only replace that optocoupler
Use the Pendant Resolution selector switch to select between 1,10 & 100 and you will see Resolution inputs 1, 2 & 3 Change from LOW to HIGH as they are selected. If the inputs change they do not need replacing. If one is faulty only replace that optocoupler
Testing procedure for the Estop Input
Opto No: 38 is used for the E-Stop signal.
Remove the wire connected to Estop 2.
Go to the F1 screen and make sure the Estop input shows LOW and is not inverted.
Test the optocoupler by connecting the +ve of the MASSO power supply through a 5.6K resistor to the EStop2 input
On the F1 screen, you should see the input change from LOW to HIGH.
If the input changes from one state to the other the optocoupler is ok and does not need replacing.
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Simplified Chinese 
Opto: 1
Opto: 9 Plasma THC
Opto: 25 Spindle Encoder
Opto: 26 Spindle Encoder
Opto: 27 Spindle Encoder
Opto: 35
Opto: 36
Opto: 37
Opto: 38
Opto: 39 Spindle CW
Opto: 40 Spindle CCW
