| Electronics > Repair |
| Anritsu MS2651A repair (need service manual) |
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| jkf1000:
Still no further with mine but not had much time due to other projects/repairs. I have fitted new SRAMs as they are a known failure point but that made no difference, next stop is probably the video RAM which I found reasonably cheap but a real pain to fit. I have found more information about them at (http://www.ko4bb.com/getsimple/index.php?id=manuals). Download the service manual for the MS2665C model which is very close to what we have and gives a lot more information on the signal paths and board to board connections. There is also a file named MS2650 service manual which contains bits of service info. Let me know how you progress.. Karl |
| ducus:
Hi there, Did you manage to fix your spectrum analyzer? I have an Anritsu MS2668C with same behaviour like yours. It wass working an suddenly it being to do stange things with amplitude. After recalibration noise flor it is around-20 dbm. Before it was a problem with power supply but i fixed. Do you have maybe the pinout or voltage frim power supply? Thanx |
| jkf1000:
Not able to offer any further information for you unfortunately. It does sound like you may have a failed amplifier or attenuator stage. I ended up selling mine as a parts unit. I managed to resolve the display issue which turned out to be a 74 series IC which sat on the data lines from the main CPU so was corrupting pretty much everything else. Turns out that mine had other issue which I don't have the tools needed to diagnose the various stages. Basically you need a working analyser to be able to trace issues on a faulty one. One thing I have learned from the time spent with mine is not to buy another Anritsu device. There is just not enough service and repair information out there, even for long discontinued products. Karl |
| ducus:
Tanks for reply. It is possible to be one amp, but is more an challenge to fix it. If it will be to sell parts from it i will get more money than i spend buying this one. |
| jkf1000:
It all comes down to how cost effective the time and potential parts cost will make the repair. No doubt a good analyser when working but when you compare it to a budget Siglent or Rigol unit with 12month minimum warranty and more features it very quickly becomes beyond economic repair. Karl |
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