TROUBLESHOOTING & REPAIR Model 100E Instruction Manual
202 045150102 Rev XB1
is located in the upper left-hand corner of the relay board when looking at the electronic
components. If D1 is blinking, then the other LED’s can be used in conjunction with the
DIAG menu I/O functions to test hardware functionality by switching devices on and off
and watching the corresponding LED go on or off. The LED only indicates that the logic
signal for an output has been activated. If the output driver (i.e. the relay or valve
driver IC) is defective, then the LED will light up, but the attached peripheral device will
not turn on.
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