- Philips PM3384 Oscilloscope Fail Autocal error d1a - 1 Update
- RCA main board - 2 Updates
| Frank Heizler <frankcovending@gmail.com>: Mar 17 08:46PM -0700 Hi. I have am pm3384 and it's been a fine machine for me. Recently I ran into an issue with the cursors. They aren't accurate to the displayed waveform at all. I tried to use autocal and it failed with error code d1a. I read the service manual, which makes no reference to this error code or any for that matter, and performed a manual calibration. Well long story short it still failed and was wondering if anyone is familiar with d1a? Thanks |
| "ohg...@gmail.com" <ohger1s@gmail.com>: Mar 17 09:54AM -0700 On Tuesday, March 16, 2021 at 7:25:57 PM UTC-4, Stu jaxon wrote: |
| "ohg...@gmail.com" <ohger1s@gmail.com>: Mar 17 09:58AM -0700 On Tuesday, March 16, 2021 at 7:25:57 PM UTC-4, Stu jaxon wrote: > > > J > > That works if the supply maintains the struggle of feeding the short, but most of these more recent circuits (like these TCONs) are fed by buck converters who shutdown when the programmed current value is reached, so the offending load part never gets hot. When using the forced current trick, one must remember to limit the voltage, as sometimes the shorted part may suddenly open under the strain and an over-voltage will then damage something else. > I have a variable ps, and medical freeze spray, but i never injected a voltage/current into a circuit. could use some tips/pointers.?? Simply feed 2 amps (but no more) on either side of the fuse with respect to ground (the screw lands are fine). Since the input to the TCON is 12V, make sure your supply does't go over 10V or so. With a dead short, you should be reading mostly current and almost no voltage. Spray the whole board with freeze spray so it frosts over. Watch what thaws first. Could be one of the brown chip caps or even one of the chips. |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 3 updates in 2 topics"
Post a Comment