Electronics > Repair
Advantest R3273 / R3267 Repair
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serg-el:
It seems to me, or is there a crack from the fastening of the plate, and down to the right diagonally?
chick0n:

--- Quote from: serg-el on November 19, 2022, 08:43:49 pm ---It seems to me, or is there a crack from the fastening of the plate, and down to the right diagonally?

--- End quote ---

Thanks..I checked it...and this picture is not from my analyzer. I borrowed it from "3g57", on the forum. :)

I found another picture, from a R3267. There the BIAS Circuit was never connected... Weird...

As I understand, the RF deck of the R3267 is the same as the R3273. Especially the first mixer for the low band. Only the High Band mixer goes up to to 8GHz, instead of 26GHz.


I have 2 assumptions about this circuit:

1. BIAS Voltage for the mixer diode, to compensate for the LO output power fluctuations.

2. In the R3271 Service Manual, a similar circuit is described. There a BIAS TEE is used to prevent the IF from the High Band mixer (421MHz) leaking to the low band. How this works I dont know...
chick0n:
Im trying to tune the YTF / High Band Mixer in the cal menu, with my Marconi 6203 Microwave Source. Looks promising.

This is YTF Band 1 from 3.7 to 7.4 GHz, sweeped at -10dBm. Before and after coarse tuning attempts.

The traces are looking crappy, because the Marconi isnt synched to the R3273.
ginji:
Dear chic0n

Thanks to this blog, I was able to repair my R3267, thank you very much.
After investigating the cause, it turned out that there was a problem with the 1st IF or the 2nd IF. When the SSG signal was applied to the 2nd IFin of 421.4MHz, the level was normal.
After looking at this blog, I measured the voltage at pin 3 of the ERA-5 and it was 11.2V, so I knew the ERA-5 was dead.
I ordered ERA-5SM, and I got it cheaply at ¥210/piece.
I installed the ERA-5SM and it was a perfect repair.
The voltage after installation is 4.7V.
Thank you very much.

ginji
ginji:
Added, low level problem of R3267.
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