Nocto Loco 4

I have been battling with the nocto loco once again. The case is open and all wires exposed, the multimeter is set to on and copies of all instructions are finally printed out. (In retrospect, it is always a good idea to print these out first.) With thanks to Will of Bowood Electronics I now have a new voltage regulator 7805 which after solder sucking the last fried piece out has had to be wired up directly to its conectors. Good news it that it appears to have worked! Horrah! There is a steady reading of 4.9V. Oh and I decided to buy a new power plug, one that could be identified as centre negative and 9v DC (you just can't guess these things).

This little diagram came in handy for understanding centre negative
And so this is the opposite, centre positive


So, things seem to be going well in terms of the tweaking of power, voltage regulator sorted and working, now checking the IC chips and two are fine, another 4.9 V DC, however the smaller 4558 IC is not responding (even when I shout at it for 5 minutes!). Could it be the chip is fried? Replaced with one I had lying around and still nowt. So, following the circuit diagram it looks like pin 4 goes via a resistor and to pin 2 of the voltage regulator. Ha, there must be the problemo. So with a small piece of insulated wire a new connection is being made, just as this is being typed.... will it be a success?