| Electronics > Repair |
| [SOLVED] HP 34401a - Error 612, 613, 615, 617, 618, 619, 621 |
| << < (4/22) > >> |
| chihaxinh:
Hi All I have some free day for prepare new lunar year , i making measurement and give you information. I replace 3 opamp 706 but not help , again and try again . So i have only one new opamp 706 , pls help me I checking Q202 and Q211, Q211 part exactly in service guide but Q202 have marking 1671 . In service guide, Q202 it's N chanel JFET 2N5461 , i cheking pinout: Q202 - 1671 marking have D S G 2N5461 have S D G i think 1671 like japan jfet . I change pin 1 2 for matching like schematics but not help ! Can you guide me how to check opamp live or die ! Thank you so much ! |
| TiN:
Did you measure output current from ohm source? Use external DMM to measure current from marked node to 34401's LO terminal. |
| chihaxinh:
Hi Tin i have 3 another 34401a, but i not pro. can you guide setup for measurement ! you mean checking voltage or current? |
| TiN:
Current. You should read correct currents with red lead connected to CR202 anode, and black lead connected to 34401 meter's LO (black input jack is ok). |
| chihaxinh:
Hi Tin I have some mistake , Q202 it's P chanel JFET - so i checking picture in internet for sure pin out connect in diagram . You can see picture below for setup measurement current like you said ? |
| Navigation |
| Message Index |
| Next page |
| Previous page |