Electronics > Repair

[SOLVED] HP 34401a - Error 612, 613, 615, 617, 618, 619, 621

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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 ?

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