Hi,
i have a Agilent e4433a from the bay without the output board insight (nice present if I opened it up
).
And Other Fails:
1. display not working
2. attenuator properly defekt (wars not connected and someone try to fix it)
3. Output Board missing.
I repaired the display thing first, the negative voltage wars bad. at connector j21 pin7 (I manually put minus16v on at pin) and the display came back to live. I found a small defective sot23 diode on the bot side of the motherboard, from u614 pin (vsw) to pin (in), I replaced it with a bav99 diode.
I found out that the ad7528jp is not changing his output voltage if I press on the display buttons on the front, I replaced the DA converter and the TL074 opamp next to the DA as well.
I placed a lm224 for the tl074, bingo the display is fixed.
I searched for an replacement output card but They are very expensive.
I searched the net and found a output card from a tester who looks the same from outside it is a "e5515-61183 (3947) vector output 1 or 2" Card.
I purchased 2 of them for 26$ each! Perfect, arrived and they fit inside the e4400.
Switched on the unit 😱🙌😞.
Stay tuned! I post pictures etc.
the unit boots and tell me of corse its the wrong card "eeprom dose not mach or simular meening"
now i need anyboddy who has such a card with the eeproms to read it out.
U801, U804, U805, U806
eeprom 2048 x 8- or 1024 x 16-bit organization (93C86)