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| EIP 545B Frenquency counter |
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| HighPrecision:
--- Quote from: Guile on May 12, 2018, 10:27:00 pm ---I've had a look at EIP 575 Service Manual and found Error 40 code means DAC table Error. --- End quote --- "DAC Table Error" is apparently an access problem to calibration data stored in A105 EEPROM, Error 32 is also suspicious related. Check all power supply voltages on main board, not directly on power supply board, often there are problem on connectors contacts to board edges. Also check for possible data/address BUS overloads from PIA chips (68B21). --- Quote ---Thus, if this Service Manual can be used for my 545B I'll be able to repair it. At least I have to dig a bit more onto A107 board now. --- End quote --- Yes, this manual is usable. |
| douardda:
--- Quote from: Stray Electron on May 12, 2018, 05:43:50 pm ---douardda, Did you get the YIG working in your counter? If not, I have a 545 that I got in pieces and I have an extra YIG oscillator and it appears to be in good condition. I think it may have option2 in it as well. --- End quote --- Hi, yes I have the power meter working. I made some hardware modification on A107: add an AD7524 (U12) , removed R39 and installed a detection diode (I used a QSCH1245 instead of the original FH1100). But I did nothing on the firmware side: the power meter code was already included in the CPU main EPROMs. I have not yet made the required calibration for the power meter to be really usable. For now I'm installing a better OXCO in the EIP before doing a complete calibration of the unit (up to rather low frequencies for now, since I cannot generate signals above 3GHz). Note: I described this in part 2 of my series on my 545B https://whatever.sdfa3.org/eip-545b-rf-frequency-counter-part-2.html David |
| douardda:
--- Quote from: Stray Electron on May 12, 2018, 05:43:50 pm ---douardda, Did you get the YIG working in your counter? If not, I have a 545 that I got in pieces and I have an extra YIG oscillator and it appears to be in good condition. I think it may have option2 in it as well. --- End quote --- Nope I could not make it work properly. I'm pretty sure I have a problem on one of the 2 boards in this unit (in addition to the loose YIG sphere) so in the meantime, when I found a replacement A201 unit at decent price on eb, I bought it. So I've put this repair aside for now. David |
| Guile:
Hi HighPrecision, Thanks a lot for those precious information! I'll let you know how it goes! Thanks also David for the information about the power meter. On mine the option is not included, but I would say I have more urgent things to do on this equipment now. |
| Guile:
--- Quote from: douardda on May 13, 2018, 03:09:45 pm --- --- Quote from: Stray Electron on May 12, 2018, 05:43:50 pm ---douardda, Did you get the YIG working in your counter? If not, I have a 545 that I got in pieces and I have an extra YIG oscillator and it appears to be in good condition. I think it may have option2 in it as well. --- End quote --- Hi, yes I have the power meter working. I made some hardware modification on A107: add an AD7524 (U12) , removed R39 and installed a detection diode (I used a QSCH1245 instead of the original FH1100). --- End quote --- Hi Douardda, I was just wondering if you've removed R40 as well? Indeed, according to the schematic of Option 02, the resistor is removed as well. |
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