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HP 8594E downgrade after battery replacement
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Hello everyone. I'm new to the group, so I really appreciate your messages, which have helped me a lot with the input attenuator repair on my HP 8594E analyzer.
The last thing I have done is change the button cell (from 1995) and the supercapacitor that supports it, since it was swollen and damaged (of course, entering the correction data by hand after the change).
Before, it indicated me, in the options screen, the following:
?
004: OVEN
101: FADC
103: GATE REV B
010: TG
043: RS232 + PARALLEL
8594E? #1870
Firmware rev 950914
?
?
Now, after changing the RAM battery and capacitor, the options window shows
?
004:OVEN
101:FADC
010:TG
043:RS232 + PARALLEL
8594C? #-13585
Firmware rev 950914
?
Option 103 no longer appears... and the serial number has changed and the model too... OMG...
?
Also, when powering on the analyzer, it previously displayed a 360-second countdown during warm-up and no longer displays it after a battery change.
Does anyone have any suggestions or ideas where the problem could come from?
?
I also have problems with the TG as it seems to put out too much power, although I haven't looked into this yet... Between 0dBm and -10dBm the trace is +4dBm. Then when I turn down the power or dim by hand, it gets even more out of place, dimming as it pleases, which I will review, but the excessive power is not a consequence of that dimmer, or so I think...
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Paneles laterales |
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I answer myself on part of the doubts raised...
... Verified to work on rev: 950308
?
Enable Gate Option 105:
1) Press Frequency -2001 Hz
2) Press Cal, More 1 of 4, More 2 of 4
3) Press Service Cal, Flatness Data, More
4) Press top softkey (not labeled)
5) Press Exit
?
To verify Install:
press Config, More 1 of 3, Show Options It worked for me.? Now, to continue looking for answers... |
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On Mon, Jun 13, 2022 at 08:36 AM, <tektonandroid@...> wrote:
--- TG has external ALC option in one of the TG menus. If external ALC is picked and a power detector is not connected TG will be at max power independent of power setting. It could simply be the wrong setting. If you are seeing this behavior with internal ALC you can try using a negative polarity diode power detector and external ALC option ?to narrow down the issue. Ozan |
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If you care about setting your serial number back to 1870, you can run
the command: ??? SERSET 1870 via either the GPIB port or the EXECUTE TITLE facility. In the service manual, the command: ? FACTSET 11023,1 sets the analyzer to a C series.? You could try "FACTSET 11023,0" to see if it will put it back to an E series.? Just a guess. -mark |
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Thank you very much. The next step will be that...
At the moment, I have the output attenuator disassembled, and I see that the central relay (the 16 dB one) must be wrong, since it attenuated about 30 dB. After opening it and bridging the contacts, it seems to improve, reaching 20 dB (although I can't get the 16 dB that it should have). It seems to be in poor condition. Does anyone know where to buy an equivalent one? It has 8 pins in a 5mm x 4mm square. |
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Thanks. I will try.
I have also seen, in another forum, this list of commands: Thanks to Alex. FACTSET 13345,1 sets a bit in NVRAM with unknown effect FACTSET 11023,1 sets the analyzer to C series FACTSET 11076,1 sets the analyzer to L series FACTSET 782,n sets the FM demod zero to n FACTSET 783,n sets the FM demod slope to n FACTSET 784,n sets the FM demod narrow bw setting to n FACTSET 785,n sets the FM demod wide bw setting to n FACTSET 68 sets a bit in NVRAM with unknown effect |
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On Jun 20, 2022, at 11:16 AM, Teo.P <tektonandroid@...> wrote:
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