| Electronics > Repair |
| Rohde & Schwarz SMIQ03B with Error 110 Output unleveled; IQMOD: ALC failure |
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| sorenkir:
Hello, I have this generator with the error in the subject (no photos yet). It is cosmetically like new, very heavy, built like a tank, but very high hour count: 88640h (10 years) and attenuator toggle count more that 10M! The RF output is very distorted (seems like clipped and wrong amplitude). I will soon try to find the fault with the help of the 4 Service Manuals found on KO4BB's Manuals Repository http://www.ko4bb.com/manuals/index.php?dir=Rohde_Schwarz Unfortunately, these manuals are missing the schematics. Does anyone have them or know where I could find them ? Thanks, Michel. |
| rastro:
I have not seen any CLIPS for this unit in the public domain. Have you try running the calibration routines in volume 1 of the service manual. They will should provide error messages if they fail. However you will need to first the first level password. There are 3 levels of password protection for the SMIQ models. They are as follows: PASSWORDS LEVEL 1 123456 LEVEL 2 250751 LEVEL 3 120155 There are also digital test points available at the user interface. -rastro |
| sorenkir:
Hi, Thanks for your help. I have tried the test points of IQMOD, the only one to be out of range is 2122 (Control voltage burst element / Power Ramp). Maybe related to back panel input "POW RAMP" ? I will try to follow the path from this input into the IQ Modulator... Michel. |
| rastro:
Michel, There is also a troubleshooting write up on an SMIQ06. It's in German but you can probably pick and paste into google translate. http://www.bymm.de/documents/27/SMIQ06B_6GHz-Modul_V1_11.pdf -rastro |
| sorenkir:
Thanks rastro, but this note applies to the 6GHz option board, which I don't have. I will continue my debug but I'm afraid it will not be very easy: double sided board, no silkscreen, no schematic except the block layout on the cover and a short description in the Service Manual... |
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