Lord of the Rings
Stern, 2003You're currently viewing posts by Pinsider barakandl.
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Quoted from kniven11:Mouser has several with the right package (Dip-8) but from other manufacturers. Pinout seems to be standardized. I hope one of them will be a matching substitute.
If there is no output coming out of the oscillator it is probably failed.
Pin out is standard. Just get the right package shape. Since it does not look like they are using the output enable you can also use an always enabled type. Then just match working voltage. CTS, Abracom or any brand will do.
Quoted from kniven11:I have checked both with oscope and logic probe and there is no pulse on Q, E or pin 34-35 on 68B09E. Just nothing... (Well, a Zero with logic probe on q and E)
Zitt - If you, by 'pull', mean physically remove R502 and 509 I'd rather not. They are SMD and I have extremely little experience soldering smd stuff. Or did you mean something else?
barakandl - TY for advice on substitutes.
Before posting this question I searched for a week on various forums and oscillator failure seems rare. But I have a hard time finding any other solution plausable since I have nothing on pin 1.
(Note! - Stern number the pins 1-2-3-4 but standard pin numbering is 1-4-5-8)
Not only am I seeking help, I'd think it might help somebody else in the future...
You can count the pins either way. 1, 4,5, 8 is because they are in a dip-8 package shape only using the outside four pins.
Oscillators are an integrated circuit and a mechanical device in one. Generally robust but they can fail, specially if you over volt the power supply pin. Every now and again, maybe 1 out of 250pcs, I get a bad one right out of the manufacturers packaging that is dead immediately or fails during the burn in test. Maybe it got whacked in shipping, or who knows.... I think the manufacturers get a defect rate in parts per million....
you could just desolder the output pin of the oscillator to isolate it from the rest of the PCB and then check it again. If still nothing coming out of it, its dead.
Quoted from kniven11:Thanks for the replies!
Some soldering required, I guess...
I always try to do as little soldering as possible on any board. You just never know what happens with pads etc. Even though I'm fairly good at it...
It's easy to just swap the oscillator, cheap too, but I just put the question here to see if you had any other suggestions before doing soldering.
Always socket if possible...
The posts on an oscillator can are pretty thick. I don't know how well it will fit into an IC socket without damaging it.
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West Chester, PA