White's XLT

[Nezocas]

Hi,

I have a friend with an XLT that its running the batteries flat under 1 hour.
All work´s fine, the only issue is the excess of power consumption.
The research I have made, indicates XLT will only uses under 200mA hour to work properly.
Anyone has got the serviçe manual for this detector, or any ideia to the cause of this.

Rgards
Nezocas

[Nupi]

Hi Nezocas,
I do'nt have a service manual but how many mili amps use the MD?

[Koala]

Measure consumption before assuming there is a fault. I have had several faulty battery lately. Just had some badged Kodak fail after an hour or so in a Whites Classic than normally runs for 20+ hours.

[Carl-NC]

What kind of batteries?

[Koala]

What kind of batteries?

Not sure if the question is for me or Nezocas

Any rate I was out and about and pick up some Kodak zinc chloride batteries. Thinking about it probably unusable after 2 hours.
Never had a problem with cheap pond shop alkaline batteries.

[Nezocas]

According to my friend, he says he has used non rechargeable batteries, and rechargeable batteries and even also some 2700mAH, and problem remains the same

Regards

[bklein]

Does your friend plan to open it up to do an electronics repair or just send back to Whites?
Thinking of how to check this out, you could kludge up a two wire cable that leads to a digital meter to read current (mA or A). You need to have one wire contact a battery contact and then slip in an isolator between it and the contact it would normally hit. Then slip in another wire/tab that contacts that contact. So you break the battery contact with the meter in-between. Doesn't matter which battery connection you modify as they are all in series. Slip the battery tray in, turn it on, read the current.

Be sure backlight is switched off, and try with/without headphones to see how readings change.

[Nupi]

In # 2, I asked how many millie - amps MD consumed. So you can have an idea where the error can be But after three days, still no answer.
Strange!!!
If the MD is working properly then you should maybe think on the power supply.
Maybe a leaking stabilization IC.
But with the information from Necozas so far. it's only guessing.

[Nezocas]

Hi Nupi and remainig friends
I will only receive the detector next week from my friend.
Meanwhile I asked him what as happened to the detector.
He has told me that a few years ago a faulty coil forced him to send it to withes UK .... and they send it back with a new coil.
After he received it, the MD was only used for short periods and only a few times.... because he has got other detectors.
Only thing that happened to the MD was a diging toll that opened the LCD case, while he was driving to a detection spot. That day he didnt use it, and returned home.
He inspected if any harm was done and glued the lcd protection in place.
I will check for scratched PCB, high ESR capacitors and capacitance (its an old detector) and also the mHA/hour to see if its correct
Is it possible that Withes send him a faulty coil or even a coil that is not suitable for this detector.... I think NOT....but lets see
Regards

[Nezocas]

Hi again,

Detector arrived today.

I placed 8 batteries in it and power it on. It gave me on power on 8.5 volts on the screen .... It should be 12Vdc and NOT 8.5 volts
Removed the batteries compartiment and double check them.... It was 12Vdc
Power it on again....and same thing 8.5v (something must be wrong).

Before starting to dissassembly anything, I made some mesurements on the coil pinout.
Is this the right coil for this detector...??? I leave some photos of the coil

Coil:
1-2 93.90 homs
1-3 0 homs
1-4 6.9 Mhoms
1-5 6.9 Mhoms
2-3 0 homs
2-4 6.9 Mhoms
2-5 6.9 Mhoms
3-4 0 homs
3-5 0 homs
4-5 1.67 homs

I also made some power comsumption of the detector:

Detector OFF
0.094 mA

Powering ON
70 mA

Before ground balance check
52 mA

During the 2 stage ground balance
52 mA

Ready to detect
52 mA

Moving 1Kg of solder in front of coil
75 to 85 mA

I will wait for some ideas, before starting to check bad solder joints broken tracks and high ESR caps
Best regards

[Nezocas]

Hi,

I have checked all cap´s and solder joints and nothing.
Looking to it´s average power consumption of 80mA.... it should last for 30 hours of detecting with a battery pack of 2400mA
Also some photos of the inner part´s

[Koala]

Detector OFF
0.094 mA

Powering ON
70 mA

Before ground balance check
52 mA

During the 2 stage ground balance
52 mA

Ready to detect
52 mA

Moving 1Kg of solder in front of coil
75 to 85 mA


Sounds okay to me

Maybe an intermittent fault.

[alcartraz]

just a thought have you tested the volts in side the metal detector are there 12 volts to the board on the battery connections ?

[Merc]

Perhaps the detector has a problem measuring the correct battery voltage and is falsely indicating that the batteries are flat.

Merc

[Nezocas]

just a thought have you tested the volts in side the metal detector are there 12 volts to the board on the battery connections ?

Yes I have