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Old 9th June 2003, 01:57 PM   #1
Eric J is offline Eric J  United States
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Question Testing a dual output DC/DC converter

Hello everyone. I've been reading this forum for some time, but this is my first post. My electronics knowledge isn't quite up to the level of most here, so bear with me I'm trying to test a 12v in, +/-15v out DC/DC converter to see if it's faulty. It's an outboard unit for a car cd player. It has the following 6 wires on the output side:

yellow/red
yellow/black
solid yellow
solid black
black/white
blue/yellow

I tested them with DMM and both black wires are grounds, and I'm getting +15v from the solid yellow wire, but nothing from the other two wires. I'm guessing one of the black wires (black/white?) is for reference, and the blue/yellow wire is the turn-on lead for the converter.

My question is, can this converter be tested with a DMM, or do I need to use a dummy load and/or an o-scope to test it? If it can be tested with a DMM, how exactly would I go about it? TIA
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Old 9th June 2003, 05:20 PM   #2
paulb is offline paulb  Canada
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Some switchers require a dummy load to work properly.
A DMM should be fine to test with.
Do you know which wires are the input?
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Old 10th June 2003, 12:07 AM   #3
Eric J is offline Eric J  United States
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Besides the previously mentioned six wires that connect to the cd player, there's two more wires for power and ground (yellow and black) on the other side of the converter. Here's a picture of the block diagram on the converter:

Click the image to open in full size.
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Old 10th June 2003, 01:28 AM   #4
Eric J is offline Eric J  United States
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Hmm.. I guess I can't edit my post. Here's the picture again:
Click the image to open in full size.
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Old 10th June 2003, 05:34 PM   #5
Eric J is offline Eric J  United States
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Here's the picture:
Attached Images
File Type: jpg drx9255 dc-dc converter 2.jpg (30.8 KB, 51 views)
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