Electronics > Repair
Rohde & Schwarz SMIQ03B with Error 110 Output unleveled; IQMOD: ALC failure
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drhex:
Probably same process as getting from 02B to 03B - you just need a factory install key. Can probably be reverse engineered somehow. Do you have info on the 6L variants? SOme around for parts on the Bay...
Jarek:
Angielski

I also have a problem with SMIQ03
I have IQ Modulator version A240.1084.98.00.06
This is different than the ones described in the posts.
Here are the transistors marked as( .H1 ) .  There are three of them in series under the radiator. The casing is as in the photo.
What kind of transistor is it? Does anyone have a diagram of this version of IQ Modulator?
drhex:
Schematic I have is for 1084.9800.01S. V102 is in there as SHF-88. Parts list for 1084.9800.01SA shows it as SHF-O186K4230TR made by Stanford

Mine failed after sending it out to calibration. Soldering in another switch didn't resurrect it so bought another modulator and calibrated it myself. Worked reasonably well, +.5dBm off over the whole amplitude and frequency range. Can live with that.
Jarek:
Thank you Drhex
You're right, it's SHF0186.
My module gets very hot. I am looking for damaged elements.
drhex:
I have a few more or less broken modulator boards here in case you're interested.
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