EEVblog

EEVblog 1702 : A Most Interesting REPAIR

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A repair of this Tennismatic T1000 remote control was way more interesting than I expected.

https://tennismatic.com/main/page_products_ball_machines_t100_series.html

Forum: https://www.eevblog.com/forum/blog/eevblog-1702-a-most-interesting-repair/

00:00 – Tennismatic 1000 Tennis ball machine remote control

00:53 – Battery snap ohms measurement
01:17 – Battery current measurement
02:29 – It’s a row/column thing
02:57 – Teardown
05:20 – Membrane inspection
06:44 – Membrane keypad continuity test
07:25 – Pro Tip: Using multimeter as a shorting lead. Testing the microcontroller.
09:27 – Is it the membrane connector?
10:17 – What would take out the entire keypad?
12:10 – Closer inspection of the contacts
12:44 – Ah Ha! What’s this?
13:48 – Inspecting and testing the row membrane connections
15:01 – Conductive silver ink time
16:41 – The culprit identified
18:48 – Let’s try some fresh conductive silver paint
21:36 – DAMN IT! Dave goofs.
22:56 – How conductive silver ink/paint works
24:01 – Measurements after curing
26:01 – Winner Winner Chicken Dinner

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EEVblogBy David L. Jones
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