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