Re: Weller PU81 bad transformer?
But if the primary have 15 Ohm and by the Ohm law I=U/R (230V/15 Ohm = 15.3 A) am i right?
So i think the primary should be minimum 500 Ohm so that Fuse (0.5A) can handle it
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Re: Weller PU81 bad transformer?
Found this PU 81 schematic on the web.
I would disconnect the xfmer secondary and use the dim bulb tester (say across on/off switch) to see what happens.Attached FilesLeave a comment:
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Re: Weller PU81 bad transformer?
You should use the dim bulb tester to test shorts so you won't be eating fuses. Does it still burn fuses/dim bulb lamp glow very brightly if the secondary is disconnected from the rest of the circuit?Leave a comment:
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Weller PU81 bad transformer?
Hello, my Weller PU81 wont started today
I check and see that fuse burned (0.5A/240V), replaced it and same thing happened.
I try widouth soldering iron attached - no help.
I disassamble PSU and check transformer with ohm resistance. Primary is 15.7 Ohm and secondary is 0.03 Ohm. I think it is gone bad, am i right?
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I replaced the bulb only on my Toshiba DLP The bulb is a TB-25. This is the first time I've done a bulb only replacement. Supposedly there is a timer module that needs to be re-calibrated or reset. I don't know where the module is located. I see some vendors selling the bulb with the housing stating module included which leads me to think the module is located inside the enclosure the bulb mounts in, but I didn't see it. Maybe it's inside the plug attached to the bulb?
Anyway - I am seeking information on how to reset this so called module so that the lamp will operate. Apparently... -
Hi,
I have a LUMIMAN Smart Bulb that suddenly stopped lighting one day. The bulb is still detected in the app, but won't light. I've probed around and nothing seems to look off with any of the diodes, caps or resistors. The Bluetooth/Wi-Fi module seems to be working as it's still detected in the app. I even tried deleting and re-pairing the bulb (it didn't light, but I was still able to follow the pairing instructions), it re-paired fine, but still no light.
In diode mode, the LEDs all light up when probed so I'm guessing this means the LEDs themselves are OK. I was expecting... -
Picked up a Tektronix type 422 oscilloscope locally for a few bucks last year.
It wouldnt power on at all so I stowed it away under my bench for later testing.
Today I remembered it was down there and pulled it out to see what was what.
I checked for continuity and everything checked out.
There was a burned smell and a resistor was replaced with a temporary replacement (see yellow box in picture).
The burned smell is very pungent/acidic and I am not familiar with these vintage electronics to know whether I am smelling the remains of the replaced resistor or... -
Hi all,
Got this local made DC power supply (12/14V) given free as the transformer has melted. There is no marking or indication to identify what type or rating of transformer used.
Fyi,. I had a busted autogate mainboard with transformer with marking 13-0-13 . Is this the 13v dc type transformer?
My questions are
1. How do i test to see if the transformer is in good working condition?
2. Can this transformer (marking 13-0-13) be used to replace the melted transformer on the DC power supply?
Hope you guys understand what i was asking. My intention is... -
Hello!
I'm looking at an original Xbox PSU: Foxlink ftps-0002 rev. B. The 12 V output is too low, and the 5 V output is too (?) high. Unfortunately I don't have an oscilloscope but only a DMM for diagnosis.
Measured voltages with no load:
After rectifier diodes
12V: 6.17 V
5V: 5.67 V
Secondary transformer pins AC measurement (really don't know if this says anything)
12V: 2-2.5 V
5V: 1.04 V
I also have another (working) Xbox psu from Delta. The same measures there, in order, being: 10.79,...
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