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  1. Martaine2005

    Help needed to identify a component.

    What model is it? I might have a schematic. Without the schematic and component references, it’s pretty much impossible to say. In-house codes mean nothing when searching for replacements. Martin
  2. Martaine2005

    Sharp GF-320

    My dictionary says “intermittent”. Yeah, open it up and have a really close thorough visual. Martin
  3. Martaine2005

    Charging Lithium Battery Pack without Charger

    Where did you get that information? Each diode would only drop 0.6/0.7 volts. Schottky diodes would be around 0.2/0.3volts. As already be told, bin them. sometimes, the old label “no user serviceable parts” is correct!. Buy the batteries you want with a dedicated charger. Be safe and fire free...
  4. Martaine2005

    Sharp GF-320

    Hi @swarmofbaboons, welcome to EP. I think before overthinking this, it could have been a fully working unit before being thrown around in the post. Intermittent faults are by nature the trickiest to diagnose. Personally, I would open the unit and check all connections, connectors, ribbon...
  5. Martaine2005

    Didn't make a note of single subject in engineering, graduating soon what to do?

    You could always work in a call centre if you fail the exam. Not taking notes and selling the notes you had is proof that your heart is not in it. Nobody can advise someone who doesn’t help them self. If you fail, take it again! Martin
  6. Martaine2005

    Technics SA-290 receiver problem

    Ok. If you can, leave the top off in anticipation of it playing up. Grab a wooden cooking spoon or drum stick ready for poking around. When it ‘locks up’, use the wooden spoon to put a little pressure on components and the PCB in case there is a cracked/dry solder joint. You should hear sound if...
  7. Martaine2005

    Technics SA-290 receiver problem

    Hi @nicholaslawson12, welcome to EP. When the tuner section locks up, do you still get volume from the radio?. Or do you only get volume from CD/AUX and PHONO?. When the tuner section locks up, do the headphones work on radio? Or just the other inputs?. As this unit is approx 38 years old, there...
  8. Martaine2005

    Help identify power components

    The red component is a fuse ( I think). I can’t see any markings properly. The blue component is a MOV (metal oxide varistor). The grey component is an X2 class capacitor (probably). Can’t see any markings again. The black component is a NTC as you have identified. These are for circuit...
  9. Martaine2005

    Axial motor help (Flux motor)

    Not following but did see it there. I quite liked your comment about the flux capacitor. You may find help with your clock movement from bhi dot co dot uk. I know several clock repair shops that frequently call bhi for advice. It could be worth a call. Martin
  10. Martaine2005

    Bell 9241 capacitor replacement

    Of course it’s worth the effort. Nothing ventured, nothing gained. Follow post #4 and see how you get on. Martin
  11. Martaine2005

    What happens when I try to use a 12V rated LED bulb in a 3.7V light fixture?

    I can’t find any information except U3 is a constant current LED driver. I’ll leave this for the experienced forum members. Martin
  12. Martaine2005

    Axial motor help (Flux motor)

    Is that you Ken? Martin
  13. Martaine2005

    What happens when I try to use a 12V rated LED bulb in a 3.7V light fixture?

    For the purpose of complete understanding, can you tell us the markings, letters and numbers on three components. U1 U2 and U3?. also, on the back of the PCB in the centre, there looks to be three solder joints that appear cracked. The photos are clear enough to be sure. Martin
  14. Martaine2005

    Bell 9241 capacitor replacement

    That looks ‘slightly’ damaged!. Have a scrape of the area to try and clean it plus expose the copper tracks. First, check there is no short circuit between the + and - where the cap was. If the copper traces or pads are damaged, keep scraping until you get to clean copper traces. You’ll have to...
  15. Martaine2005

    plz suggest replacement for rifa safety capacitor

    I’m no audiophile and don’t believe the hype in £1000 RCA cables. Having said that, MKP are mentioned a lot on audio forums. Have a look here. Your original Rifa are renown for problems. Yours is a 0.22μF so get the same capacitance if you can. Martin
  16. Martaine2005

    LED buck drivers and reducing current

    Hmm, not an advert for crest? Moderators note : removed link from quote
  17. Martaine2005

    Craftsman 18V Ni/Cd Circular Saw with DC Motor Problem - HELP !

    A cheap cordless tool can have a 300W motor. Most good tools have 500W + motors. These can draw 30A peak. Anyway, 18V x 16A = 288W peak. Well above your biggest supply of 160W (peak). Your other supplies may be ok after they cool down!. Also, no load speed is after it’s started rotating. It...
  18. Martaine2005

    Craftsman 18V Ni/Cd Circular Saw with DC Motor Problem - HELP !

    A laptop Power supply is not a sufficient power source. What is it? 3.5A or so?. The motor start up current or stall current could be 5 > 10 times that of the PSU. That is why it runs ok on the car battery which can deliver 100s of Amps. Martin
  19. Martaine2005

    Quooker PCB short circuited

    Never measure resistance while the circuit is powered. Not only will you get incorrect results, you may cause damage to the circuit, multimeter or yourself. Martin
  20. Martaine2005

    Air Compressor Controller

    Or better still, check the date of the thread you reply to. Martin
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