Electronics International OPT-1 - Manual (Page 11)

2. Set the instrument toggle switch to "Oil Press" and check for a digital oil pressure reading of "00."
A problem at this step could be caused by a poor connection or crossed pressure transducer wires.
The voltage on the pressure transducer wires (with the transducer connected to the unit) should mea-
sure as follows:
Red Wire - +5 Volts.
Black Wire - 0 Volts.
Green Wire - 1.65 Volts.
White Wire - 1.65 Volts.
3. Set the instrument toggle switch to "Temp" and check the instrument to read proper oil temperature.
A problem at this step could be caused by poor or improper connections between the oil temp probe
and instrument. If the instrument is not connected to the oil temperature probe it will read cabin
temperature. By applying a small amount of heat to the oil temperature probe the oil temperature
readings will increase one degree at a time.
4. Check the digital display backlight. With high or medium ambient light it is hard to see the digital
display backlight (it is only required during low ambient light conditions but should be on all the
time).
5. If the analog LED dimming wire has been connected, turn the panel light rheostat up and look for
the analog lights to dim. Note: If any red warning light is on, none of the analog lights will dim.
6. Start the aircraft engine and check the digital and analog displays to read oil pressure properly. A
problem at this step could be caused by a poor connection or crossed pressure transducer wires.
Measure the voltage on the pressure transducer wires as listed in step 2. If the voltage measurements
are correct and the oil pressure reads "00", the white and green wires between the pressure transducer
and instrument may be reversed.
7. With the engine running, check the digital and analog displays to read oil temperature properly. If
there is a problem at this point see step 3 above for troubleshooting information.
8. After running the engine, check the engine and pressure transducer fittings for oil After running the engine, check the engine and pressure transducer fittings for oil After running the engine, check the engine and pressure transducer fittings for oil After running the engine, check the engine and pressure transducer fittings for oil After running the engine, check the engine and pressure transducer fittings for oil
l e a k s . l e a k s . l e a k s . l e a k s . l e a k s .
9 Rev: A 6/17/92