EMX LP D-TEK, Operating Instructions Manual

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Troubleshooting
Symptom Possible Cause Correction
Green indicator is not ON No input voltage 1. Check voltage on pins 1 and 2.
2. Replace internal fuse
3. Check wiring to detector
Green indicator flashes Loop wire shorted or
disconnected 1. Check loop resistance on pins 7 and
8 it should be less than 5 ohms
and more than 0.5 ohms.
Green indicator flashes with
two consecutive fast blinks Loop wire was temporarily
shorted or disconnected
1. Check loop resistance on pins 7 and
8 while driving over the loop it should
be less than 5 ohms and more than 0.5
ohms. The reading should be steady.
Detector stays in detect
mode after the car left the
loop and fails to un-detect. 1. Faulty loop
2. Poorly crimped terminals
3. Loose connections 1. Perform megger test between loop
lead and ground the reading should be
larger than 100 mega ohms.
2. Check that loop is tightly connected
to proper terminals
3. Check that splices are tightly
soldered and sealed against moisture.
Detector detects
intermittently even when
there is no car on the loop. 1. Faulty loop
2. Poorly crimped terminals
3. Loose connections
4. Cross-talk between
adjacent loop detectors 1. Perform megger test between loop
lead and ground the reading should be
larger than 100 mega ohms.
2. Check that loop is tightly connected
to proper terminals
3. Check that splices are tightly
soldered and sealed against moisture.
4. Set adjacent loops on different
frequencies.