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Author Topic: DATRON 4000 with FAIL 3 - what to do?  (Read 2425 times)

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Offline geanguTopic starter

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DATRON 4000 with FAIL 3 - what to do?
« on: September 12, 2017, 06:01:27 pm »
I have a DATRON 4000 that displys FAIL 3 and the front lanel is locked. What is this and how to fix it? Help please.
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Offline tggzzz

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #1 on: September 12, 2017, 08:42:47 pm »
Fortunately there are some hints to be found, including on this website.
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Offline Johnny10

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #2 on: September 12, 2017, 09:27:24 pm »
Fail 3

I will try and give you information from the Service Manual
Right now I am without power and internet, we were in the path of Irma.
« Last Edit: September 12, 2017, 09:32:24 pm by Johnny10 »
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Tektronix TDS7104, DMM4050, HP 3561A, HP 35665, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, DOS4EVER uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, HP 8568B
 

Offline Johnny10

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #3 on: September 12, 2017, 09:46:20 pm »
Section 4.5 part

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Tektronix TDS7104, DMM4050, HP 3561A, HP 35665, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, DOS4EVER uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, HP 8568B
 

Offline Johnny10

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #4 on: September 12, 2017, 09:53:02 pm »
I know this could be better but with just an iphone hotspot I am at a disadvantage for the next few days.
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Tektronix TDS7104, DMM4050, HP 3561A, HP 35665, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, DOS4EVER uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, HP 8568B
 

Offline geanguTopic starter

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #5 on: September 13, 2017, 11:49:15 am »
Thank you tggzzz, but nothing about Fail 3 out there, and no manual for Datron 4000 to find. 
Thank you Jonny10, I will try to dig into it and I really appreciate you helping even while hit by Irma. Wish you well and be safe. Would be possible to scan the manual and post it somewhere? Thanks again.
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Offline geanguTopic starter

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #6 on: September 13, 2017, 04:04:57 pm »
Got it, the problem was a register chip MC14021 defective. Now it works. Still would be nice to have the manual if possible.
Thank you for help
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Offline Johnny10

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #7 on: September 13, 2017, 04:18:54 pm »
That was a quick repair!       :-+

Did the keyboard start working also?
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Tektronix TDS7104, DMM4050, HP 3561A, HP 35665, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, DOS4EVER uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, HP 8568B
 

Offline geanguTopic starter

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #8 on: September 13, 2017, 04:30:22 pm »
Yes, all is good now.
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Offline essele

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #9 on: February 01, 2022, 05:17:54 pm »
Just to add to this for other people's future reference...

I also had a FAIL 3 on my 4000A (which had been fine for a number of years) ... after a bit of round the houses troubleshooting and realising there was a second lot of power supplies in the schematics, I found it was actually caused by a shorted tantalum on the in-guard power supply board.

It was causing zero output on the -15V(2) and the -10V(2) supplies. This situation doesn't seem to trigger any power supply monitoring and manifests itself as a lack of serial comms between the reference divider and the analog interface, hence the FAIL 3.

... bizarrely I missed the in-guard power supply board when I was re-capping, rectified now and all is good.
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Offline Chris56000

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Re: DATRON 4000 with FAIL 3 - what to do?
« Reply #10 on: February 01, 2022, 10:41:39 pm »
Hi!

This any help?

https://www.google.com/url?sa=t&source=web&rct=j&url=https://xdevs.com/doc/Datron/4000A/Datron4000_Calibration_and_ServicingHandbook.pdf

PS!

Despite the enormous file size, the file for the 4000/4000A on k04BB is only half–a–dozen pages of it – please use the one I've linked above!

Chris Williams
« Last Edit: February 01, 2022, 10:53:47 pm by Chris56000 »
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It's an enigma that's what it is!! This thing's not fixed because it doesn't want to be fixed!!
 
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