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Offline Mike24012Topic starter
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Whites 4900 D
« on: December 28, 2015, 12:54:26 pm »
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I have a 4900 D purchased new. The sensitivity has never been anything to brag about but after trying to use it recently the depth sensitivity has gotten worse. Does anyone have any service information such as schematic, stage gain informaion etc.?
Thanks for any information.


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Offline ArfieBoy
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« Reply #1 on: December 28, 2015, 02:28:56 pm »
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Check with White's.

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Government can not give anything to anyone...  without first taking it from someone else!
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« Reply #2 on: December 29, 2015, 12:58:45 pm »
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I would contact whites direct

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EAT SLEEP DETECT REPEAT
Offline Mike24012Topic starter
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« Reply #3 on: December 29, 2015, 03:20:59 pm »
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Thanks to both who have responded. I contacted Whites yesterday but as of now no response.

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« Reply #4 on: December 29, 2015, 05:12:06 pm »
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Whites will Work on it no problems.   Tune Up and replace Caps that have gone South.   

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Offline Mike24012Topic starter
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« Reply #5 on: December 30, 2015, 11:43:04 am »
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Years ago I purchased a schematic from Whites on another model that was actually current at the time. This came on what looked like blue print paper. I thought there might be digital versions now but guess not. I am fully capable of repairing it myself being a radio technician and broadcast engineer for 35 years. Guess I'll have to call them to see if they still sell them.

Thanks for the response


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« Reply #6 on: December 30, 2015, 10:18:37 pm »
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Glad you can work on them as Whites has no parts any more for 4900-5900=6000 detectors, u could get parts off the net I'm sure, and the repair in Chicago says no parts or repair    shortribs

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« Reply #7 on: December 31, 2015, 12:04:48 pm »
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5900     

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http://www.geotech1.com/forums/showthread.php?21839-4900-5900-D-board-and-schematic&highlight=4900+schematic



This is most the same.

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