I bought a nonworking 8595E analyzer. The analyzer did not turn on. I was able to repair the power supply. When I inserted the repaired PSU to analyzer the -15V LED turns off and -15V disappear.
The problem was in the burned shorted tantalum capacitor located on the Narrow Band IF Board which was replaced:
After it I can power on the analyzer but other problems were revealed:
1. Very slow reaction to controls and display refresh - need to wait 10-15 seconds after each key presses. And spectrum refreshes once every ~30 seconds. Empirically I found out that if disconnect the A25 Counter Lock board the problem is resolved. The board is defective?
2. No response of analyzer to 300 MHz calibration signal. The calibration signal level and frequency was checked using frequency meter and millivoltmeter. It corresponds to 300 MHz -20 dBm. If I try to do FREQ CAL the error will appear: CAL SOURCE NOT FOUND.
I measured the signal with millivoltmeter at the point A (after Attenuator -> YTF -> LPF) in the band 0 and it seems good. So I guess the problem may be in the Dual mixer or Second converter. But I have not instrument to check the high frequency signal after mixer.
How I can to localize the defective part? I have not RF generator or other analyzer. I have only 15 MHz generator and 100 MHz DSO.
Analyzer screen after power on (A25 Counter Lock board connected):
After 10 seconds:
Thank you all who responded.
The problem was in the burned shorted tantalum capacitor located on the Narrow Band IF Board which was replaced:
After it I can power on the analyzer but other problems were revealed:
1. Very slow reaction to controls and display refresh - need to wait 10-15 seconds after each key presses. And spectrum refreshes once every ~30 seconds. Empirically I found out that if disconnect the A25 Counter Lock board the problem is resolved. The board is defective?
2. No response of analyzer to 300 MHz calibration signal. The calibration signal level and frequency was checked using frequency meter and millivoltmeter. It corresponds to 300 MHz -20 dBm. If I try to do FREQ CAL the error will appear: CAL SOURCE NOT FOUND.
I measured the signal with millivoltmeter at the point A (after Attenuator -> YTF -> LPF) in the band 0 and it seems good. So I guess the problem may be in the Dual mixer or Second converter. But I have not instrument to check the high frequency signal after mixer.
How I can to localize the defective part? I have not RF generator or other analyzer. I have only 15 MHz generator and 100 MHz DSO.
Analyzer screen after power on (A25 Counter Lock board connected):
After 10 seconds:
Thank you all who responded.
Not so easy to repair by e-mail hi.
I presume you have downloaded the manual of the 8595 = 08595-90001.
The anouncment of "OVEN COLD" will that disappear after several minutes ?
Basic 10 MHz can be out off frequentie.
300 MHz signal is not passing through
By entering "frequency" -37 Hz or -2001 Hz , then "CAL" this will bypass the cal routine see manual.
Even its possible there's an other malfunction in the PS. Missing voltage !
Also the battery is defect no memory will work see manual p 3-93
These are very short hints. By reading the manual (lot of work) can give more answhere.
succes
Ary
pa0alv