| Electronics > Repair |
| Aeroflex IFR-2398 / calibration / repair help |
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| andy_silicon:
Does anyone have the calibration software ? Alternatively a dump of the firmware ? Or possibly knowledge of the Gpib commands involved in the calibration procedure ? I have an EBay score IFR-2398 which is mostly okay - except it fails the Level Cal. Attenuator looks fine , 40Mhz cal signal shows at -41dBm ( should be -30 ). From my good signal source it does look a little all over the place for level - so it may be that the level calibration is required ( looking at the service manual ) Any guidance / theories / previous experience appreciated. I have access to a decent signal source ( Agilent E4437B ) , and a pretty accurate VSA (E4406A) , a few scopes and general test equipment to aid alignment/repair. Note: I asked aeroflex - they are only interested in performing the calibration themselves. ( for about 450 quid ) I ask you - where's the fun in that ! Equipment porn by request ( it has hundreds of screws and is a pain to disassemble the RF section ) |
| andy_silicon:
Okay - so I guess I'm on my own. Unit disassembled - cpu board removed. Flash was socketed ( clamshell - psop device ). Cpu is intel i386ex embedded device. Arggh - PA28F400B5T .... Scrabble through the older adapters , and find an old WinLV programmer. Woo hoo - flash dumped. Now how do I find the config/system password. Thrown the flash image into IDA , worked out that the base of the flash is 0x3f80000. Ram starts at 0x0000000 Seems to be written around JMS C:Executive Lots of features in the flash related to calibration but not easy to access from the unit - I guess the work begins now. |
| andy_silicon:
Okay - the service manual mentions keying in the password "27329780" to get to the factory setting which allows the calibration tables to be cleared before recalibration. For the life of me I couldn't get this password to work. ( no enter key! ) So after much reverse engineering I now see the bloody obvious. ( once you see that they used a generic routine for entering numbers it was obvious the termination of input was one of the Hz/Mhz/GHz buttons ) It's the "Hz" key to enter the password. Sigh.... At least on the way I discovered another password for the system menu "72237908" Needless to say don't mess with these extra menus unless you wan't to wipe out you calibration. There do appear to be undocumented gpib commands - the work continues. |
| andy_silicon:
It does look like you can perform the various calibrations from the front panel ( once you enable the factory menu with the password. It's going to be tedious. I think there must be a way to upload/download the calibration tables via gpib. Not sure yet how to do that. |
| videobruce:
Do you think that password would allow unlocking any options? I had a 2399A that I wished I never sold. The main reason was that damn floppy. :( Good luck on your project, I'm surprised no one stepped up to the plate yet. |
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