Electronics > Repair

Rohde & Schwarz SMIQ03B with Error 110 Output unleveled; IQMOD: ALC failure

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Qw3rtzuiop:

--- Quote from: Jarek on November 15, 2023, 01:53:22 pm ---What kind of transistor is it? Does anyone have a diagram of this version of IQ Modulator?

--- End quote ---
Take a look here:
http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Rohde_Schwarz/Rohde_Schwarz_SMIQ

Jarek:
Thank you for the offer Drhex.
I've already bought it.
Regards

Jarek:
ERROR:
   VECTOR_MOD and LEVEL_ATT calibrations fail with 'Reference voltage oot (6.9 ... 12V)

Which reference voltage exactly is it?

lcharman:
Hi All and Jarek

I seem to have the same problem as yours.
Error occurs while calibration.
My Post is here https://www.eevblog.com/forum/repair/rohde-schwarz-smiq03b-with-error-313-error-180-calibration-failed-and-erro183/msg5546891/#msg5546891
I replaced the SHF0186 V103. Its drain voltage is changed from 0.64V to 6.7V.
I have no idea what is the reference voltage 6, 9, 12V.
I check the manual and find any point may relate to the reference voltage.
It may be below
1. X240.A2 UREFAM 0-12V (AM Command Value)
2. TP2121 D_IQCAL 0-12.5V (Cal detector IQ Modulator)
3. TP2120 D_PHI 3.5-13V (Control Voltage phase shifter )
4. TP2014 D_TUN2G4 3-18V (Tuning voltage 2.4GHz VCO)
it is the priority of my troubleshooting.

Could you share the idea of yours?

Thanks!  ;D

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