Hi all.
I´m trying to repair 2 3458A (at least make one from both)
N1: We was using this until failed
-114 Multislope rundown convergence: suspected A3 board with no replacement.
-209: Harware Failure: Timeout - Unable to read A/D: I don´t know from where I should start searching.
N2: Was a mule, multiples failures, stored for more than 5 years:
- It has no fan (replaced)
- It has no reference (repaced)
- RAM Test 1 Low (fixed with new dallas nvRAM, only 1230´s, I have no programmer yet)
- Bad A3 board (don´t show any measurement) -> replaced by the other A3 and starts measuring, but fails after a while
Actually has:
- HARDWARE FAILURE FLATNESS DAC CONVERGENCE 198 -> Suspected failing A2U404 (+: 6.86V -:6.52V)
-101: CALIBRATION ERROR (AutoCal fails at first step)
PostScript: Changing A2 from first to second removes errors and start working, passes self test and autocal, but then, time passes:
209: Harware Failure: Timeout - Unable to read A/D:229
114: SYSTEM ERROR: Multislope Rundown convergence
101:CALIBRATION ERROR
When CAL 0 is executed, it shows:
205: HARDWARE FAILURE CAL VALUE OUT OF RANGE:13
Any clue?