Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old February 16th 21, 10:34 AM posted to sci.electronics.repair
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Default help with circuit repair

Am 15.02.2021 um 22:08 schrieb JB Haskins:
I have a small, handheld geiger counter made by a firm called RDX
Nuclear (model is DX-1).* Unfortunately, a much younger family member
than I decided to try putting a 9V battery in it, but he put it in the
wrong way before I could intercept him.* Now, when the activation button
is pressed, all I'm getting is a constant tone.* Within the tone, I can
hear individual clicking as if it is still taking counts, but that's it.
*Also, the indication needle is pegged.* Here is an image of the top of
the circuit board:

*https://i.imgur.com/kSHzB0T.jpg

Unfortunately, I've never seen a schematic of this unit on the web even
though it seems to be sold all over the place.* Contacting RDX, all they
want to do is replace that tiny board... for $120.* So, if you hooked it
up backwards, what would you check first?* I did check the diodes and
they all seem fine.


Please remember to remove the loose screw underneath the pcb

-UP

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Old February 16th 21, 05:41 PM posted to sci.electronics.repair
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On 2/16/21 4:34 AM, Newdo wrote:


Please remember to remove the loose screw underneath the pcb

-UP


Very observant! That's actually the pcb board screw and there so I
don't lose it (unfortunately, I have a habit of losing screws).
Luckily, the only way to power it on is by having the board re-secured
with that screw so no worries.
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Old February 16th 21, 06:26 PM posted to sci.electronics.repair
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Default help with circuit repair

JB Haskins wrote:
don't lose it (unfortunately, I have a habit of losing screws).


Small medicine bottles make good screw holding containers.

Of course, you then have to not lose the small medicine bottle
containing the screws.
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Old February 16th 21, 07:42 PM posted to sci.electronics.repair
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Default help with circuit repair

Of course, you then have to not lose the small medicine bottle
containing the screws.


https://www.amazon.com/Staineless-Ma.../dp/B00NF0LH18

Comes in various sizes and configurations. That my bench also has a sheet-metal insert under the working surface also helps. Yes, the insert is fully insulated electrically.

Peter Wieck
Melrose Park, PA
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Old February 17th 21, 05:04 PM posted to sci.electronics.repair
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Rich wrote:
JB Haskins wrote:
don't lose it (unfortunately, I have a habit of losing screws).


Small medicine bottles make good screw holding containers.

Of course, you then have to not lose the small medicine bottle
containing the screws.


Better to stick a refrigerator magnet to the case and
put the screws on the magnet.


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Old February 17th 21, 05:56 PM posted to sci.electronics.repair
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Default help with circuit repair

Better to stick a refrigerator magnet to the case and
put the screws on the magnet.


Clearly there are no cats in your household.

Peter Wieck
Melrose Park, PA


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