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Control Training and Service Manual
119
Troubleshooting the Output Opto-Isolator
The opto-isolator IC chips used in these circuits are the H11J (output) devices. The
drawing shows the pin location for component checks on the output opto. The
indented circle in the upper left hand corner of this chip indicates the location of Pin
1. Note that the number sequence is in a "U" format: downward 1, 2 and 3 on the
left and upward 4, 5 and 6 on the right.
Output Opto-Isolator Pin Location
OUTPUT VOLTAGE CHECK
Pin 1 Receives the DC source voltage (3.3 VDC range)
Pin 2 Completes the DC source to the digital ground
Pin 3 No voltage signal at this point
Pin 4 Receives the AC source voltage signal from the input transformer
Pin 5 No voltage signal at this point
Pin 6 Completes the AC voltage path to the gate of the triac (24VAC)
Note that all AC source checks are referenced to the associated transformer
neutral and/or the safety ground, and that the DC source reference is to V- or
digital ground.
6
5
43
2
1