| Electronics > Repair |
| Anritsu MS2651A repair (need service manual) |
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| Falkra:
--- Quote from: jimon on March 30, 2016, 09:07:37 pm ---Does anyone have an idea where to look for service manual ? Tried to google it, but was not so lucky. --- End quote --- Is this what your are looking for ? http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Anritsu/MS2601A_J_SM.pdf |
| jimon:
--- Quote from: Falkra on June 29, 2016, 09:18:01 am --- --- Quote from: jimon on March 30, 2016, 09:07:37 pm ---Does anyone have an idea where to look for service manual ? Tried to google it, but was not so lucky. --- End quote --- Is this what your are looking for ? http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Anritsu/MS2601A_J_SM.pdf --- End quote --- MS2601 is a bit close, but different: - Modules layout is different, 2651 have almost everything RF related in one block, with external local oscillator board. - 2651 uses 4.xxx GHz between 1nd and 2st mixer when 2601 is uses 2.5214 GHz - 2651 IF is 110.695 MHz and 2601 is 21.4 MHz - YTO \ VCO controls looks to be different - etc :( |
| jkf1000:
If your unit is responding to an input signal, assuming that it is displaying the correct signal frequency, that suggests to me that it is not a mixer issue and is more likely to be a leveling issue. Maybe a failed AGC or ADC. Does it display your input signal at around the right signal position on screen? Does the signal level displayed on screen match the output level of your generator? |
| jkf1000:
I have had a probe around the RF board and not been able to find the 110.7Mhz signal but there are 16 pins on the connector that I am not able to probe. There is a very good chance that it will be on one of the unreachable pins. I found the 100Mhz reference and the 12Mhz mixer signal (on the connector marked X2) but that was all. I find it very strange that they would choose to route a high frequency signal through a 0.1 header then on via a board to board interconnect. I can only guess that it has very effective guard traces around it or it is buried in one of the inner board layers between ground planes. The only way you will see more is by making some sort of extender cable as you suggested before using an ATA type connector. One thing I did notice is that from the 32 0.1 header connections, at least 17 of them are just ground which leaves only 15 for supply, signal and control signals. If there is anything else I can check for you just ask. Karl. |
| jimon:
Hm it's strange that you have 12 MHz around X2 (Looks like it's directly coupled to YIG), I don't think it's a reflection from the mixer ... or it might be? I got the extension cable, and indeed top pins are mostly ground and power, will check lower ones. |
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