Much safer to use a diagonal cutter with sufficiently thin and sharp jaws to clip the pins at the shoulder, up against the plastic. Much less risk to the circuit board. Too easy for a Dremel to get away from you.
73
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Cobra 2000 GTL frequency counter issue
- Thread starter Cable Guy
- Start date
73
By gum, it worked! The fix from TSB1232 and new caps did the trick. No more 32 MHz.
Gotta love it when a plan comes together.
73
Gotta love it when a plan comes together.
73
Great job, do you remember if the 32 MHZ changed in 10 khz increments when changing channel?By gum, it worked! The fix from TSB1232 and new caps did the trick. No more 32 MHz.
Gotta love it when a plan comes together.
73
Probing deeper, and all things being equal, the IC506 5032p pins 12 & 13 aren't outputting a signal whereas the working counter does emit some timing signal spikes. I think it's either the IC506 or the chip it feeds, IC503. Checked both in the same mode with the same vco input. I might as well replace the IC506. It now only displays 33.3333 regardless of mode or channel.
Got a socket in today, replaced the IC506 and she's counting on all fingers again.
I think one finger is longer than it should be, reads 500 hertz high and CT501 won't adjust any lower. I see X501 is running about 250 hertz lower than the stated 10.4858 mhz, maybe it's aged, maybe I can nudge it? I will try.
I think one finger is longer than it should be, reads 500 hertz high and CT501 won't adjust any lower. I see X501 is running about 250 hertz lower than the stated 10.4858 mhz, maybe it's aged, maybe I can nudge it? I will try.
Yep, C537 was a 56pf, replaced it with the schematic value of 47pf and it's adjustable to spec now. I love it when things work out like that.