AQ1B Compact Underwater Metal Detector
User Manual
Troubleshooting Guide
Symptom:
No Response from AQ1B-Compact Module
Check the following:-
1.
Check that the battery has been charged -
¾
If not, place AQ1B-Compact on charge and then re-test.
2.
Check that both Sensing Loop and Bonephone are correctly connected
¾
Try using an alternative Bonephone/Aquapulse Headphones.
¾
Try using an alternative Loop or a known good Aquapulse Probe.
3.
Check that both the Sensing Loop and Bonephone are in good
condition. Check by substitution if possible or by monitoring the
nominal resistance of both items. Connecting a good quality multi-
meter across the pins of the plug can check the resistance. NB. It is
good policy to firstly check the multi-meter’s reading with the leads
shorted together - this provides a measure of what residual reading to
take into account.
¾
See Aquapulse Resistance Chart below: -
Item
Approx. Resistance (ohms)
20cm Loop
1.4
25cm Loop
1.6
38cm Loop
1.8
12" Probe
5.8
36" Probe
5.8
Bonephone 5.4
Land Headphones 15.0 (Minimum Volume)
U/W Headphones
10.5
Symptom:
Erratic Performance from AQ1B-Compact Module
1.
First check the resistance as in the above table.
2.
Check that the metallic contacts of the bulkhead connectors are clean.
3.
Check that the metallic contacts of the Sense loop and bonephone are
clean. If necessary reduce the contact resistance by slightly prising the
gap in the male contacts, this will increase the firmness of the
connector on insertion.
4.
Check that the cable to the Sense Loop has not been damaged causing
water ingress.
5.
Check that the male connector seals are in place and clean.
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