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RCA connections
RCA connections
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Old 10th September 2021, 08:04 AM   #1
aalewis is offline aalewis  Australia
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Default RCA connections

How do you test if you have a problem with one of your RCA connection. I had an issue with no sound coming from the left speaker so I changed RCA cables and magic the left channel was singing magic again, but I thought if it didn't work I would not have known how to check the RCA connection.
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Old 10th September 2021, 08:19 AM   #2
thimios is offline thimios  Greece
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RCA connections
Use your ohmmeter.
Measure between gnd and hot pins for short circuit.
Then look for loosen hot pin connection.
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Old 14th September 2021, 10:10 PM   #3
Galu is offline Galu  Scotland
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Here's some additional information on testing RCA interconnects using a multimeter:

Set your multimeter to a resistance (ohms or Ω) scale.

Test continuity between the centre pin at one end of the cable and the centre pin at the other end. The meter should read zero ohms. If it does not, there is a break in the centre conductor

Repeat for the outer ground shields at each end of the cable. Again the reading should be zero ohms.

Finally, test between centre pin and ground shield at one end of the cable. The reading should not be zero ohms! If it is zero ohms, there is a short between the centre conductor and the ground shield.
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Old 14th September 2021, 11:16 PM   #4
wiseoldtech is offline wiseoldtech  United States
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I made a quick and easy simple RCA cable tester.
Used a small meter, a 1.5 volt AA cell, a resistor, switch, and a pair of RCA panel mount jacks - in a small project case.
Ya plug each end of the RCA cable into the set of jacks, flip the switch, and wiggle/flex the cable around some, while watching the meter.
If the meter stays at "0", good cable.
If it jumps at all, or goes full scale - bad cable, trash bin it.
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Old 14th September 2021, 11:36 PM   #5
Galu is offline Galu  Scotland
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Yes, a plug in cable tester is a great idea - quick and easy to use!

Inexpensive commercial ones are available if aalewis wants to avoid the diy route.

The attached one costs just 15.
Attached Images
File Type: jpg Cable Tester.jpg (127.4 KB, 84 views)
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Old 15th September 2021, 03:43 AM   #6
NareshBrd is offline NareshBrd  India
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Click the image to open in full size.
30p upwards of UK currency!
5.50 buys a Mastech 830B digital multi meter
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Old 15th September 2021, 05:25 AM   #7
jean-paul is offline jean-paul  Netherlands
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Quote:
Originally Posted by wiseoldtech View Post
I made a quick and easy simple RCA cable tester.
Used a small meter, a 1.5 volt AA cell, a resistor, switch, and a pair of RCA panel mount jacks - in a small project case.
Ya plug each end of the RCA cable into the set of jacks, flip the switch, and wiggle/flex the cable around some, while watching the meter.
If the meter stays at "0", good cable.
If it jumps at all, or goes full scale - bad cable, trash bin it.
I stopped reading after "a small meter"

Pin to pin and GND to GND. Both should be approx. 0 Ohm.
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Old 15th September 2021, 06:10 AM   #8
wiseoldtech is offline wiseoldtech  United States
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Quote:
Originally Posted by jean-paul View Post
I stopped reading after "a small meter"

Pin to pin and GND to GND. Both should be approx. 0 Ohm.

But see, some cables can be intermittent, and a simple probe test may not reveal that issue.
My little device shows if ANY changes in 0 ohms happens when flexing the cable, particularly where it enters the plug.
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Old 15th September 2021, 06:11 AM   #9
jean-paul is offline jean-paul  Netherlands
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There is a truth in that I must admit. On the other hand I have had cables that didn't have interruptions in sound but flexing changed their resistance.

Psst... go digital. 1 or 0.
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Last edited by jean-paul; 15th September 2021 at 06:13 AM.
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Old 17th September 2021, 06:05 AM   #10
aalewis is offline aalewis  Australia
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Thanks for all the helpful responses.
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