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Traco TXL 060-0533T PSU repair
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john_a...@hotmail.com
Jul 30, 2015, 7:18:34 AM7/30/15
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Hi,
I've just fixed one of these 60W power supplies. This has triple output (+5V, +15V, -15V). Fault was -15V output gave -1V and +15V output gave +6V, LED not lit.
First saw that C37 (-15V smoothing capacitor) was bulged, replaced with 450uF 35V low ESR. This caused -15V output to become -6V, +15V still only +6V. Started to look at primary, unsoldered mains input capacitor (C5, 150uF 400V), measured at 60uF so replaced - no change.
Looked around for any other suspects, unsoldered C8 (47uF 50V) and found it was nearly shorted. Replaced and all outputs now OK, LED lit. Tested up to 1A load, very little voltage drop.
I think C8 might be in the starter circuit but I don't have a schematic.
Regards,
John
I've just fixed one of these 60W power supplies. This has triple output (+5V, +15V, -15V). Fault was -15V output gave -1V and +15V output gave +6V, LED not lit.
First saw that C37 (-15V smoothing capacitor) was bulged, replaced with 450uF 35V low ESR. This caused -15V output to become -6V, +15V still only +6V. Started to look at primary, unsoldered mains input capacitor (C5, 150uF 400V), measured at 60uF so replaced - no change.
Looked around for any other suspects, unsoldered C8 (47uF 50V) and found it was nearly shorted. Replaced and all outputs now OK, LED lit. Tested up to 1A load, very little voltage drop.
I think C8 might be in the starter circuit but I don't have a schematic.
Regards,
John
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