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Hi all. Trying to troubleshoot issues with the Dell Laptop power supply (a lot of info here). Now I am waiting for a DC power Jack, as there is a loose contact. Want to check if the ID line of the adapter works - I have given abt 3.2 V to this line through the voltage divider, but can't see any signal on the oscilloscope. Same with the 100500% working AC adapter as well. How to initiate 1-Wire protocol transmission? As I understand, the circuit in the AC adapter should send a package for a while as soon as the supply comes to the SPID line. How to initiate this transmission correctly without... -
PROBLEM SOLVED
I DIDN'T REALISE MY SMALLEST SOLDERING TIP COULD JUST FIT BETWEEN THESE COMPONENTS.
I MANAGED TO REMOVE THEM WITH NO DAMAGE TO THE BOARD AND I HAVE MY INTENDED END RESULT.
On a Possio PM70 portable fax machine which has a scanner that detects when you push a piece of paper into the scanner slot.
It is these two small (3mm long) components that detect the paper and start the scanner feed motor which pulls the paper into the scanner.
(These are on the circuit board for the keypad and not the main board)
I want to disable these as... -
OK. I got the rocker switch figured out thanks to the good advice on this forum.
Now I need to figure out the correct wire to go to the switch from the broiler element and from the oven element.
This is a Whirlpool RDE3340 electric range.
The common wire on the switch appears to have a high temperature insulating material. I am guessing that both the wire to the broiler and the wire to the oven elements also need relatively high temperature insulation. What do I need to look for? The broiler is rated at about 2400 watts.
Where may I find parts... -
Got today two Uniden BC 760XLT vintage scanners in for repair.
Complaint: extremely weak / no audio.
IC5 TDA1905 is the audio IC. Replace 4 electrolytic capacitors that are in a row next to the audio IC. See picture. When you are at it, change the capacitor for the 8V (7808) as well.
Easy Saturday evening fix.
Time for more 
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I currently have a customer's vintage fan on the work bench to repair.
It uses an induction motor with 4 poles. One of the poles is open.
I couldn't find the break so i cut off the original wire.
I have measured the other poles and the resistance is about 28 ohms per pole and I measured the diameter of the wire with my digital calipers and it is 0.35mm in diameter.
I need to work out how much 0.35mm diameter enamelled copper wire i need to order for it to be 28 ohms. I have used this calculator and it says i need 160.35 metres.
The enamelled copper...
Working...
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