Installation manual

GEM INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.4
INSIGHT
INSTRUMENT CORP. 20 BOX 122, FORT ERIE, ONTARIO, L2A 5M6
WEIGHT and BALANCE DATA
1 G-series GEM Instrument 0.5 lb
6 Clamp EGT Probes 9 oz.
6 Spring CHT Probes 6 oz.
6 Gasket CHT Probes 4 oz.
1 Adapter CHT Probe 1 oz.
1 TIT Probe 1 oz.
1 Oil Temperature Probe 1 oz.
1 Oil Pressure Sensor 2 oz.
1 Vibration Sensor 1 oz.
1 Fuel Flow Sensor 6 oz.
1 FF Signal Adapter 1 oz.
1 Carburetor Temperature Probe 1 oz.
1 8 ft Wiring Harness 14 oz.
1 24ft Wiring Harness 34 oz.
Troubleshooting
The following is a compilation of the common symptoms and causes of problems that may be experienced
with the GEM Systems. Close examination of these symptoms should assist in identifying the cause of the
problem.
Note: All G-Series GEM's have a probe diagnostic page to check the thermocouple wire and probes
integrity. For G2, G3 or G4's turn the Page knob to see the probe analysis page. For G1's push the
top button to see the probe analysis page. The Diagnostic page shows a pair of numbers for each
probe, the two numbers are the resistance (in Ohms) of each of the probes two wires, measured
from the instrument to the probes grounded tip. The following example resistance numbers are
approximate and some variation is normal and to be expected depending on the length of the wiring
and the age of the wiring and probes.
For an 8 foot wiring harness the probe analysis page resistance should be:
EGT; 8 and 3 Ohms, and the CHT; 1 and 6 Ohms.
For a 24 foot wiring harness the probe analysis page resistance should be:
EGT; 26 and 10 Ohms, and the CHT; 4 and 18 Ohms.
Symptom: The GEM Display does not illuminate.
Cause: No ground return at Pin 15, of the edge connector either from the engine case or from airframe ground
or supply Voltage is missing at Pin S, of the P1 edge connector from the circuit breaker or bus.
Symptom: One or more columns will not illuminate.
Cause: Try recycling power to check the Display. If all columns do not illuminate, the display has been
damaged or is inoperative. Check the probe diagnostic page.