Electronics > Repair
Rohde & Schwarz SMIQ03B with Error 110 Output unleveled; IQMOD: ALC failure
zmetzing:
--- Quote from: zmetzing on August 20, 2020, 04:50:22 pm ---P.P.S. Even though my unit shows a front panel of "SMIQ03B .. 3.3GHz .. 1125.5555.03", attempting to enter a frequency over 2.2GHz (with no errors present in the system) says "Out of range". Did someone sell me SMIQ02B innards with a SMIQ03B nameplate? Or am I missing a setting?
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Well, it looks like I've been taken by an eBay seller who says "I’m pretty sure that gear run until 3.3 GHz", which isn't true of the SMIQ02B.
I doubt changing the batteries in the CPU unit would have caused it to suddenly think it is the lesser version.
Not sure if it's worth filing an eBay claim.
Anyone know if there's a way to change the model to SMIQ03B via software incantation?
zmetzing:
Fixed (I think)! I let the unit warm up for about 30 minutes, then re-tried the calibrate without any debug options turned on. It completed successfully!
Now, if I could only figure out how to fix the bit-flip that made it go from a SMIQ03B -> SMIQ02B. The seller has pictures of the unit, complete with all the S/N and external markings, showing that it, at one time, went to 3.3 GHz.
What is the "Factory Installation Key" on the back? Would that turn it back into a SIMQ03B, if entered into the appropriate software or into the instrument itself?
zmetzing:
--- Quote from: analogRF on February 19, 2019, 12:28:56 am ---did you ever managed to fix the 'IQCON no convergence' error?
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Based on my experience, this is caused by a failed S2 (SSW124) on the IQMOD board (schematic page 18, PDF page 52). I got this when I had the SWITCH_A and SWITCH_B lines reversed, so it was sending the FAM3300 signal off to the wrong path.
teknut:
--- Quote from: zmetzing on August 20, 2020, 04:50:22 pm ---Would anyone be able to post a picture of their IQMOD-CW LEV PRESET table, specifically the > 2.2 GHz frequencies?
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Hope it helps if still required
zmetzing:
Thanks! Could I beg another couple of screen shots for the IQCON table? Specifically, I'm interested in the values as they head toward 3.3 GHz.
I don't have my power meter hooked up, as the unit has a power supply problem. However, power appears to be approximately correct, given that I have 1 meter of RG-174 between the SMIQ and the Anritsu SA.
(That Anritsu will be the topic of a future repair, and possible custom TFT LCD upgrade!)
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