Aside from all this, TR703, which is an NPN all the way to the right, on the left heatsink if looking at the quad from behind, is still not giving me a reading when I go from collector to ground. I checked continuity on the cable itself and it is good. Now I'll be testing other connections following it's path... because other than that I dont know how else to find out why its not giving me a reading.
Why are you trying to get a reading from collector to ground on this transistor??
What reading are you trying to get.....I cant think why you would want to do this......
Can you try to explain your logic??
Maybe we can help you take some measurements which will be helpful......
All you will get doing this measurement is something quite high and rising as the multimeter charges the 80V 4.7uF cap up........
kevzep said:Measure from the base of the ouptuts to ground, and the collectors to ground, and see what you get......it should be a high reading.......
Let me address the power up issue. If you look at the schematic, one of the leads is going from the AC line, to the power supply board, through the two 3.9 resistors in parallel. The relay is also there, and after the big caps have charged up, so that the power transformer starts to come up to voltage, eventually enough voltage is applied across the relay and it energizes, shorting out the two 3.9 resistors. This is the sequence. Anything that interrupts this process will prevent power up.
I recently helped another guy with a power up problem who contacted me on my web site. Hi problem was the AC power switch, which is evidently a pretty common problem also. So that is the other thing you can check. some units were sent out in the beginning that only used one side of the DP switch. Check it out, and you can use both sides.
Well I was just trying to do what you told me before I guess
Also, I didn't mean that I was going to test the capacitor, I meant the path from the collector cable through the power supply board... I guess I'm just running out of ideas.
Ok cool, thanks for this info Jim. So how do I go about testing the AC power switch? And it has little jumper cables connecting the 4 contacts, so does this mean both sides are connected?