| Electronics > Repair |
| Please help, FLUKE 8920A Multimeter Repair |
| << < (37/45) > >> |
| Harry_22:
--- Quote from: Harry_22 on June 11, 2024, 01:05:21 pm ---It can be dust under P102 connector around pin 5. I'm not sure that there should be OL at this point. --- End quote --- Compare it with P101 pin 2/4/6 . They are gates of other JFET. |
| daisizhou:
Please watch the video. I don't know which choice is the right one. |
| Harry_22:
--- Quote from: daisizhou on June 11, 2024, 01:52:44 pm ---Please watch the video. I don't know which choice is the right one. --- End quote --- You completely disconnected the frontend. The logic of the device’s operation is unpredictable. Check R241 on separated board, unsolder it and check the trace resistance. If exist clean it. Carefully check the gates at P101 pin 2/4/6 compare them with gate Q29 (P102 pin 5). First connect black wire of your multimeter to metal shield or ground next connect red wire to the gate. |
| daisizhou:
--- Quote from: Harry_22 on June 11, 2024, 02:14:19 pm --- --- Quote from: daisizhou on June 11, 2024, 01:52:44 pm ---Please watch the video. I don't know which choice is the right one. --- End quote --- You completely disconnected the frontend. The logic of the device’s operation is unpredictable. Check R241 on separated board, unsolder it and check the trace resistance. If exist clean it. Carefully check the gates at P101 pin 2/4/6 compare them with gate Q29 (P102 pin 5). First connect black wire of your multimeter to metal shield or ground next connect red wire to the gate. --- End quote --- R240-R241: https://i.postimg.cc/k5RyPwDf/r240.jpg https://i.postimg.cc/B6xcX6TF/r241.jpg https://i.postimg.cc/xCr3fHzY/r241-15v.jpg https://i.postimg.cc/L52kfpDb/r241-1.jpg https://i.postimg.cc/nr24GPwc/r241-2.jpg P101-P102 https://i.postimg.cc/MTTqGM2P/P101-2.jpg https://i.postimg.cc/T15xrzPn/P101-4.jpg https://i.postimg.cc/3Rc7083K/P101-6.jpg https://i.postimg.cc/xqr2g6kh/p102-5.jpg |
| daisizhou:
The fault still exists. Is it necessary to remove this P102 pin?Disassemble, clean and reinstall |
| Navigation |
| Message Index |
| Next page |
| Previous page |