Electronics > Repair
[SOLVED] HP 34401a - Error 612, 613, 615, 617, 618, 619, 621
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TiN:
Yes, that's correct connection.
Use manual ranges for ohms on bad DMM, and measure current. Change to every range and check all current source levels.
chihaxinh:
Hi Tin

I checking and give new information, vol dc and ohm function not woking in 2W and 4W mode

I check current like your said and have

000.000 Ohm - 1mA
0.00000 KOhm - 1.006mA
00.0000 KOhm - 1.002mA
000.000 KOhm - 0.010mA
0.00000 MOhm - 0.005mA
00.0000 MOhm - 0.000,6mA
000.000 MOHm - 0.000,6mA

And voltage measurement after replace U201 and swap pin Q202 for correct pinout in schematics.
TiN:
Then your ohms current source working fine, and problem is somewhere else.
Did you check all zener voltages and power rails? I think you saw my 34401 repair? Maybe yours have similar problem.
chihaxinh:
Hi Tin, i checking power supply rails , everything ok !

Voltage DC and Ohm function not work ( 2W or 4W mode )
TiN:
Did you check all the zeners? There are many of them.
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