Quote:
Originally Posted by Kevin Kuehn
When you freeze the 723, is it possible you're also cooling a few surrounding passive components? I remember initially you were able to randomly fix this by banging the case or bending the circuit board. So don't rule out the possibility there's still an intermittent passive component or connection in the mix.
|
Yes you are correct and I was thinking about that last night. The readout freezing is the only issue now. Back then, there were additional problems of frequency readouts all over the place etc. I replaced a burned out resistor, a shorted film capacitor and cleaned all of the board connection traces on all of the boards I could easily remove. That seemed to resolve everything but this persistent issue. Another thing I noticed is there's evidence of many IC chips being replaced on one particular board. When you look at the unit from the front, the board is on the left almost up front (at work and do not have the unit or schematic in front of me). It's almost exclusively 14 pin ICs and there's a lot of variation in manufacturers and lots of flux around the pin solder points on the back or bottom if it was horizontal. I've been looking for a replacement for around 6 months now but nothing has shown up. That's funny because Penthode suggested in the RCA thread I look at finding an 8600/8601 sweep generator combo and I bought one on eBay in about an hour!..Since then, no more 8600s.