| Electronics > Repair |
| Agilent E4421B RF generator restoration project |
| << < (7/9) > >> |
| nctnico:
I'm not so sure this is 5V related. I'd expect the system to do a full reset (go through the bootloader) when the power fails. Instead it seems the application crashes and restarts itself. Yes, I already re-seated all memory chips in sockets on the main board. The chassis allows for a whole bunch of extra boards (which aren't in my machine) so my assumption is that the power supply has way more power than necessary. I won't rule the PSU out but using freeze spray on it hasn't solved the issue. It also doesn't smell like cat-wee which is a tell-tale sign of a bad electrolytic. |
| TK:
There is a LED array indicating the status of the different power rails. If all of them are ON, then the power supply is OK. During boot, there is another LED array that indicates the boot step and once all tests pass, it counts up-down. If it stops with a specific patter, then you can read the hex value and look at the service guide. |
| nctnico:
All the power leds are on and the status LEDs don't stop at a specific pattern. The bootloader and self tests are OK. It is the application itself which crashes. The status LEDs invert after the bootloader is finished and the left 4 (with the display towards you) are showing a binary counting pattern. When it starts OK then all the status LEDs are showing a counting pattern. |
| nctnico:
I found a rather large ripple on the 12V supply (200mVpp). The capacitors in the PSU still measured OK though and replacing them didn't help. I'm going to sell the generator 'for parts'. With all the repairs I did on it and the hacked output amplifier it is not going to be worth much even if it works. I have a 'new' RF generator coming my way anyway. |
| Samogon:
This is not outcome we all expect |
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