| Products > Test Equipment |
| EIP 545B Frenquency counter |
| << < (9/19) > >> |
| douardda:
I have removed the VCO board of my broken unit and begun to reverse engineer the schematic (not yet entered in kicad however). The board looks like this: I have not found any obvious culprit for now for its poor behavior (the output transistor, SC2283, looks OK with a simple diode measurement), but I have found an interesting thing: on this version of the VCO, the big 3W resistor is a Dale RW69 V220: a military version, 22ohm, capable of holding 350°C according to the datasheets! So it might be normal it's getting pretty hot when the output power amplifier is on. David |
| khach:
SRD harmonic generator is in the blue ring |
| Guile:
Hi Everybody, Thanks Douarda for this passionating dive into EIP545B! I'm also interested with activating the power meter in mine but I don't know how to proceed. When I'm trying to turn on the power meter it says 'Error 13' which I believe means the option is not installed? However I'm facing to a more serious error since this morning as my counter is saying Error 40 at every startup now and can't count above 1Ghz on Band 3. This suddenly happened. I did all the check on A107 but I've found nothing wrong. The only wrong thing I've found is there is no ramp on J7 pin 2 while this one is there when I'm entering in Test 06. Does anybody knows what Error 40 is? Sometime when I turn it on ti says Error 32 but right after it switch to Error 40. If I understood correctly Error 32 is related to PROM check (U12?) but I don't know what Error 40 is. Any help will be really appreciated :) Thanks! |
| Stray Electron:
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. |
| Guile:
Hi All, I've had a look at EIP 575 Service Manual and found Error 40 code means DAC table Error. 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. Cheers |
| Navigation |
| Message Index |
| Next page |
| Previous page |