Leaderboard

Picked this up yesterday from that horrible cunt @superbank. It works, so just needs a clean up and a once over. I'm very happy with it.

In purple boxes are all transistors... Some are nice and big to burn through the board... 😨

The resistor in the third photo says 'R47' which I think means 0R47 or 0.47 ohms. If so, your multimeter readings aren't far off.

Id say mid 70's but @BF74is the man to answer that. He could probably tell you the month

Think of resistance as open switch (high resistance / open circuit) closed switch (low resistance / short circuit)... Allowing current to flow shorter po Or what happens on ohmmeter reading if you touch probes together making a short circuit as opposed to opening them apart... We all learning & know you know the difference between transistors & triacs. I'd guess the tiny resistance is there for when the bulb is cold it has a lower resistance than then it's been lit a very short time... Much like on mps2 not really doing much but still important to limit current at a critical moment. Maybe they uprated to 47 ohms later to stop holes burning in the board as seen in my last picture upper right box...

Those wirewound resistors are usually fairly reliable, the main failure is the soldered joints so usually just re-soldering cures any problems. I have seen a few however where physical damage has occurred to the top of the resistors and broken the wire. I've never seen one go short though, pretty impossible I'd say? Aren't the triac driver resistors 470 Ohm?

Here's a few pics of how the board is looking. I've done as much work on the bench as I can do to hopefully make it a strong board... touch wood. Fingers are crossed could still take a while. The repairs are- 20% broken tracks 80% reinforcing damaged tracks Power rails are copper strip fixed with epoxy. All tested for leaks and ok Slowly getting there 😎

Ah, we have the £4.80 p2 V05 but the accompanying rom has been mis dumped sadly J