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  1. bushtech

    IGBT H20R1203 replacement

    Need to replace the abovementioned but battling to find exact match. I have been offered this: https://mantech.co.za/ProductInfo.aspx?Item=15M3975 And the H20R1203 datasheet...
  2. bushtech

    Laptop battery fix

    Opened my laptops battery. All batteries read about 4.08V apart from Batteries 3-4 and 11-12 which read 1.48V and which I want to replace.This battery pack now unobtainium from manufacturer. So 6 batteries for 11.1V 5200mAh and 56 Wh. How do I figure out what maH these individual batteries are...
  3. bushtech

    Aiber Water flow sensor

    This water flow sensor stopped working .It's part of the control mechanism in a gas (LPG)geyser. The 3 legged magnet sits in the pipe to the left of it. It senses water flow by by being forced up the pipe to in proximity to the 2 green wire bit which is a switch that gets closed when the...
  4. bushtech

    Magnifying light voltages

    I have one of these magnifying lights on my desk which has packed up. There is a 4pin plug which connects the round fluorescent tube. I am in South Africa 230VAC mains 50Hz. The 4pin plug has two grey wires and two brown wires. What voltages should I be seeing on those pins? And will I only...
  5. bushtech

    JVA Fence energiser component ID

    I've got a component that I'm not sure of. Either a cap or a MOV It's called C54 on the PCB but hmmm 474J?? A photo of the board,component has been ringed. Would appreciate some certainty here Thanks
  6. bushtech

    Gas(LPG) geyser help

    Geyser giving problems with the gas valve not being opened. The valve actuated by this electromagnet I have probed the red/black/yellow wires. Apparently 2 windings in here, one to pull it open and the other to keep it open. Looks like red common and 6.9Ω to Black and 587Ω to yellow. What I...
  7. bushtech

    Grundig YB500 World receiver fixup and panelbeat

    While I wait for my halogen light parts to arrive I decided to give this bad boy a go. It spent most of it's life down at the coast so the rust monster has started invading. It still works so I want to stop further damage and give it a freshen up, volume slider scratchy etc. This is what it...
  8. bushtech

    Power supply for little halogen light popped

    This light stopped working when I switched it on. Here is the little power supply: On checking the 2 big 13005 transistors are shorted between all legs. Bit surprised by this as they are hefty jobs and show no signs of damage. Also the diode D5 is open. It's marked DB3 and C53 as far as I...
  9. bushtech

    Osram Parathom par16 80328 led voltage

    This light stopped working although it has extremely low hours, probably about 10. Now it's a pricey little blighter so I thought I'd take a look inside. The light partially opened: Looking inside, the two wires attached to the pcb. What voltage should I see there? I get about 1000mV dc which...
  10. bushtech

    Subaru Forester remote

    This remote stopped working one day. The 2 push buttons still click nicely. What can I check to try and find out what is wrong with this remote? Can't find a schematic. Quite keen to fix this as a replacement is over $200 here in SA Apologies, the photos not very good.
  11. bushtech

    CTEK MXS 3.8 repair

    This car battery charger stopped working. Wiring diagram/schematic seem unobtainium. Rectifier diodes check out OK in circuit and I get 336V on the big cap so that all seems OK. But the plot thickens when I measure the 04N60C3 heatsinked mosfet (heatsink has been removed so I can get to it)...
  12. bushtech

    HP CM1312nfi MFP Printer network port dead

    The RJ45 network port on this printer died. No lights burning when cable plugged in. Here's a photo of the network pcb: The plug bottom left I get 3.3V on the yellow cable and 1V on the pink cable. Can't feel any chips getting hot. Pulled and reinserted all cables on board. Now I'm stuck...
  13. bushtech

    Davis Vantage Vue weather station: stop replacing battery

    This weather station has a non rechargeable CR123 that goes flat about every 18 months. Now for a system that has a solar panel I find it unacceptable that every 18 months or so you either have to drop the mast to get to the station or grab a ladder and scale the mast (9m high in my case) For...
  14. bushtech

    Samsung Syncmaster 740BF repair

    I found a swollen cap (replaced) and a FET (DMO565R) split open. The negative of the cap is connected to the ground of the FET so I hope it's the failed cap that popped the FET. Board: The big cap at an angle is the one that I have replaced FET: My problem is the FET Both Mantech and RS...
  15. bushtech

    Make your PC Power supply last- 73's de Edd

    This post by 73's de Edd deserves better publicity: ASIDE . . . .Hear one and all . . . . . On my computer power supplies, an initial task is to take the secondary filters and use two capacitors instead of the single ones. This done by stacking the second one vertically above the initial one...
  16. bushtech

    Garmin GPS120

    Friend of mine's marine gps died by being attacked by it's nemesis: sea water. I said I'd try and revive it ( Not much hope methinks) One power cable has rusted off so I'd like to replace the cabling, but to do that I have to get into the multi connector on the pcb. The question is, how do I...
  17. bushtech

    LED Dimmer suited for task?

    I bought this dimmer and the 3 led lights that it's meant to drive from an electronics place. Worked fine for about 10 hours after which I could hear some crackling in the dimmer, upon investigation I could see some sparking in the pot. The heatsinked transistor is a BT137. The lights are...
  18. bushtech

    Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

    This thread is follow on from here: https://www.electronicspoint.com/threads/power-one-power-supply-mod.284923/ The main characters in this plot are: The infamous Chinese pcb And Audiogurus's redesign
  19. bushtech

    ID Potentiometer

    I've got this nice old 10 turn pot. Unfortunately all the stickers have just about disintegrated from old age and I know nothing about it and it's history. Just for interest it was made by Beckman Instruments in Glenrothes Fife Scotland. Model RD. I'm hoping kellys eye will know them...
  20. bushtech

    Smd resistor unbelievable

    I have got a burnt resistor that needs replacing. Schematic says 300Ω 5W. As far as I can tell this is an 0603 type smd. (0603 type 1.6x0.8mm) Can't find any resistors 300Ω 5W in a 0603 package. Does such an animal exist? I have difficulty believing that something that small can handle 5W...
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