Electronics > Repair

Fluke 5700a repair

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veedub565:
After posting on a few different and random threads I thought it might be best to create my own Fluke 5700a repair thread. I've already had some hints and tips from TiN. I've already made a few mistakes and done some things wrong, but no harm seems to have been done.

So, I have acquired a Fluke 5700a physically and cosmetically in good shape, but with some faults

Date of last cal 2013

I guard rear terminal post snapped off

ETIME = 7422640 (14yrs)

FATALITY =
1/20/92    10:21:03   Fault    1822   5220  No Longer Connected
7/13/28    13:45:13   Fault    1824   5205 No Longer Connected
7/18/28    13:30:00   Fault    1824   5205 No Longer Connected
3/18/95    08:54:07   Fault    1602   Unexpected NSA From Inguard
3/18/95    08:54:17   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/95    08:54:27   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/95    08:54:37   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/95    08:54:47   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/95    08:54:57   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/95    08:55:07   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/95    08:55:17   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/95    08:55:27   Fault    4012   Sequencer Timed Out Waiting For Inguard
12/20/00    12:36:08   Fault    1602   Unexpected NSA From Inguard
12/20/00    12:36:18   Fault    4012   Sequencer Timed Out Waiting For Inguard
3/18/13    10:38:27   Fault    232   5725 Illegal/Unexecutable Command
3/18/13    10:39:26   Fault    232   5725 Illegal/Unexecutable Command

I ran the self diag and it came up with a few errors (there was an error with the A12 card, but this was resolved by fitting a spare card.
Yes I know the cal values will be incorrect now. I have access to a cal lab and I may be able to arrange to have this unit re-certified IF I get it repaired.
Yes I know swapping cards willy nilly without first recapping and smoke testing the PSU is NOT they way to do it. That's a good way to blow up a good card. Too late, it is done, and I appear to have been quite lucky.

A8: Relay Fault (3819)
A15: DC HV Amp Offset Fault (3107)
A5: ODB Output Attenuation Fault (3914)
A5: 10DB Output Attenuation Fault (3915)
A5: 20DB Output Attenuation Fault (3916)
A5: 30DB Output Attenuation Fault (3917)
A5: 40DB Output Attenuation Fault (3918)



to check the base hardware I ran self diag without A5/A6 and A14/A15/A16 cards and only reported fault was
A8: Relay Fault (3819)

veedub565:
First order of business now is to replace ALL electrolytics as they will be at the end of their useful life. Also to replace the carbon composite resistors, especially the 1W ones which are to be replaced with 3W ceramic. I'm also going to replace the fans with some Sunon ones.

How do I know which is the correct lead pitch for the capacitors ? some appear to be 5mm, some 10mm, some in between. And there are 4 or 5 different options when ordering new ones

Also a good idea to remove all the cards and give the chassis a good clean and remove all the dust inside.

I would also like to be able to get the cal report from it, but I'm still having some difficulty with this.

-> *IDN?
<- FLUKE,5700A,5185014,HA*

-> CAL_RPT?
 ! VI_ERROR_TMO: A timeout occurred
Visa ErrorCode: 0xBFFF0015 (-1073807339)

<- FLUKE,5700A,5185014,HA*
-> cal_rpt? check
<- "«x0A»«x0A»«x0A»«x0A»«x20»«x20»«x20»«x20»------------------------------------------------------------------------«x0A»«x20»«x20»«x20»«x20»JOHN«x20»FLUKE«x20»MFG.«x20»CO.,«x20»INC.«x20»«x20»«x20»«x20»«x20»S/N«x20»5185014«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»5700A«x20»CALIBRATION«x20»CHECK«x0A»«x20»«x20»«x20»«x20»PRINTED«x20»ON«x20»29.05.08«x20»AT«x20»15:46:54«x20»5700A«x20»«x20»S/N«x20»5185014«x0A»«x20»«x20»«x20»«x20»--------------------«x0A»«x20»«x20»«x20»«x20»------------------------------------------------------------------------«x0A»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»MODULES«x20»PRESENT«x0A»«x20»«x20»«x20»«x20»------------------------------------------------------------------------«x0A»«x20»«x20»«x20»«x20»Software«x20»Revision«x20»HA*«x0A»«x20»«x20»«x20»«x20»Switching«x20»Matrix«x0A»«x20»«x20»«x20»«x20»DC«x20»Volt«x20»Module«x20»«x20»«x0A»«x20»«x20»«x20»«x20»AC«x20»Volt«x20»Module«x20»«x20»«x0A»«x20»«x20»«x20»«x20»220V«x20»Module«x20»«x20»«x20»«x20»«x20»«x0A»«x20»«x20»«x20»«x20»1100V/2A«x20»Module«x20»«x0A»«x20»«x20»«x20»«x20»Current«x20»Module«x20»«x20»«x0A»«x20»«x20»«x20»«x20»Ohms«x20»Module«x20»«x20»«x20»«x20»«x20»«x0A»«x20»«x20»«x20»«x20»Wideband«x20»Module«x20»«x0A»«x20»«x20»«x20»«x20»Hires«x20»Osc«x20»Module«x0A»«x20»«x20»«x20»«x20»Rear«x20»Panel«x20»«x20»«x20»«x20»«x20»«x20»«x0A»«x20»«x20»«x20»«x20»------------------------------------------------------------------------«x0A»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»«x20»ARTIFACT«x20»CALIBRATION«x20»DATES«x20»AND«x20»TEMPERATURES«x0A»«x20»«x20»«x20»«x20»-------------------------------------------


I'm not sure what I'm doing wrong here. I'm not familiar with Python unfortunatly, and I'm not sure I'm sending the correct commands and the response seems to be a bit rubbish  :-//

Kleinstein:
For the capacitors there may be an info in the parts list if provided in the service manual.
Alternatively measure the real thing.  If it is off a little (e.g. 6 mm VS 1/4 inch) this can be sill acceptable. Chances are there are not that many different types actually used. So if you don't find tham all in the measurement run - same values are likly same spacing / though not sure).

With the carbon composite resistors one may have to be carefull in the high voltage and higher frequency parts. Wire wounds usually have more inductance and may not have the same withstand voltage. Higher resistance values (e.g. > 100 K) can be tricky as wire wound. Sometimes the resistor case  / rating in choosen because of the peak voltage and not just power.

veedub565:

--- Quote from: Kleinstein on August 13, 2021, 05:09:59 pm ---For the capacitors there may be an info in the parts list if provided in the service manual.
Alternatively measure the real thing.  If it is off a little (e.g. 6 mm VS 1/4 inch) this can be sill acceptable. Chances are there are not that many different types actually used. So if you don't find tham all in the measurement run - same values are likly same spacing / though not sure).

With the carbon composite resistors one may have to be carefull in the high voltage and higher frequency parts. Wire wounds usually have more inductance and may not have the same withstand voltage. Higher resistance values (e.g. > 100 K) can be tricky as wire wound. Sometimes the resistor case  / rating in choosen because of the peak voltage and not just power.

--- End quote ---

I had a look at the parts list in the manual, it provides all the values, tolerances etc, and even part numbers (although finding data on 30yr old part numbers is hard to say the least) I have started physically measuring the pitch, mostly the bigger ones are 10mm and the smaller ones are 5mm but there are a few in between. I guess it doesn't really matter too much, even Fluke have stretched the legs out on some. I just want to try and make it neat and tidy. It's more important for the bigger ones that the pitch is correct.

I'm going to use Carbon Film to replace the old Carbon composite resistors as this appears to be what Fluke have used in the series II version. For the higher power values (3W) Fluke list ceramic, but the pictures I've seen show a thick film resistor being used, so I'll go for them (https://www.digikey.com.au/product-detail/en/tt-electronics-irc/GS-3-100-2203-F-LF/989-1203-1-ND/2408023)

veedub565:
Well picking the right replacement caps is proving to be a right PITA. The part numbers themselves contain no information at all relating to the lead pitch. So I've been physically measuring the pitch and there appears to be 4 different flavours, 2.5mm, 5mm, 7.5mm, and 10mm. Here's an example of a problem I just discovered

There are 11 22uF 35v electrolytics in the whole unit, I measured one and it had a 5mm pitch. Great I'll order 11 of those.. . Not so fast! some of them are a 5mm pitch and some of them are a 2.5mm pitch, I wouldn't be surprised to also see one with a 7.5mm pitch.

So I've either got to physically measure, and log the pitch of every single electrolytic in the entire unit. So that I know for a given value how many of each pitch I need to order. Either that or order 11 of each flavour in order to cover all eventualities.



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