Minelab GPX-4000 Service Manual download pdf (Page 43)

80 81Troubleshooting

No sound

• Check that the detector is on (battery, power

cable, connections and LCD)

• Turn the Threshold control fully clockwise

• Turn the Volume Limit to maximum (40)

• Check that the headphones are plugged in

• Try using a different set of headphones or a

different battery

Threshold but

no target signal

• Try testing different coils with a known target

Random noise

• Ground Balance again

• Retune using the Auto Tune button

• Set the Coil/Rx switch to Cancel

• Reduce Gain

• Move away from other detectors working nearby

• Move away from thunderstorm build-up

Battery will not charge

• Check that there is power to the accessories

socket using vehicle charger

• Check the fuse in the 12V charger plug (M205-5A)

• Check the battery LED patterns (pg. 20)

Battery not holding charge

• Try an alternative charger adaptor

• Change the battery

'Coil Overcurrent' screen

appears

• Turn the detector off, wait for a few seconds

before turning it back on again

User Preferences

Main Menu: Range: User Preferences:

Volume Limit 1 to 40

Audio Tone 1 to 100

Signal Peak 1 to 20

Track Speed Slow

Medium

Fast

GB Type General

Specific

Sensitive Extra

Smooth

Iron Reject Off (All Metal)

1 to 30

Battery Volts - -

Manual Tune 0 to 255 -

Mode Edit: General: Patch: Deep:

Audio Quiet

Normal

Boost

Deep

Gain 1 to 15

Motion Very Slow

Slow

Medium

Fast

Response Normal,

Inverted

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