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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 5th Apr 2012, 8:26 pm   #1
dave cox
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Default Schlumberger Solartron 7150 IEC inlet and filter.

The inlet filter caps (i assume) on my 7150 have let the magic smoke out in a fairly spectacular fashion
This is an all in one snap in unit containing IEC connector, voltage switching and 2 fuses in quite a tight space. Made by schaffner, but if there was a part number it was burnt off.

Has anyone had to fix one of these before?
I guess a replacement is being rather hopeful.

Thanks in advance,
Dave

Last edited by dave cox; 5th Apr 2012 at 8:35 pm.
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Old 5th Apr 2012, 9:11 pm   #2
Oldtestgear
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

David Partridge ( a member of this forum) has a few of these available. Well worth sending him a PM to check price etc.

HTH

Phil
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Old 5th Apr 2012, 9:36 pm   #3
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

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Old 5th Apr 2012, 11:44 pm   #4
PETERg0rsq
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Dave

Just be aware that there are at least two versions of this mains input/selector/switch assembly (well my two 7150's were different), and i think it depends on which input transformer is fitted!

You may need to work out which winding is which by measuring the primary resistances, and meter out the switch contacts, actuated by a tumbler cam, to work out the correct connections.

One of mine had damaged contacts, so I bypassed the voltage selector completely and wired for 240V permanently.

regards
Peter
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Old 8th Apr 2012, 7:35 pm   #5
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

The original type fitted to 7150/7150/7150+/7063, amongst other Solartron stuff, was a Schaffner FN372-2-21. They are still available from various sources. We have replaced many of these over the years, (I have worked for Solartron since 1968). They seem to have a nasty habit of going up in a disgustingly smelly puff of smoke and leaking a sticky brown gunge inside the unit. I don't know whether Schaffner modified the design but later ones don't seem so prone to fail.
Any units with a different type filter have probably been changed by the user after failing in this way. I don't remember there being different mains transformers.

Last edited by Darren-UK; 8th Apr 2012 at 10:08 pm. Reason: Error in type numbers corrected.
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Old 9th Apr 2012, 1:07 am   #6
karesz*
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Hallo Dave,
you can have it (http://www.schaffner.com/) from some GB-sources too:
http://octopart.com/partsearch#searc...ner+FN372-2-21
K.
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Old 9th Apr 2012, 9:40 am   #7
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Also thanks for the information, I was looking for a supplier of the power connections, as one of mine had damaged leaf contacts below the tumbler, and I have linked the voltage selector out.

Just for information, and may be as a result of someone replacing one in the past, I have two 7150's, one is badged Enertec (french) and the other Solartron.

The input connectors are slightly different (they look identical), as the tumblers are configured differently (not interchangeable, though they would fit), with different voltage markings.

In addition the wiring to the two transformers are not identical, with different colour coding, and different resistance measurements.

I think the Enertec one had more wires, but if I recall correctly this was due to the interrnal windings being four independent windings, and no internal tappings. I would need to open it to check.

The wiring configuration between the two connectors was definately different, even thought the connectors looked identical externaly!

Regards,

Peter
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Old 9th Apr 2012, 11:12 am   #8
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

In my experience restoring/repairing test equipment, all Schaffner IEC line filters that are 15 or 20 years old have very poor reliability (even if they are "new old stock"). With some equipment it seems that all the Schaffner filters are failing. More comprehensive testing of the few units that appear to have survived shows these are actually also faulty.

Some Schaffner filters fail by exploding, others are less dramatic, and still others may appear fine but have actually failed. As mentioned they usually produce smoke, leak brown gunge, and emit a disgusting odour that lingers for days.

While the Schaffner filters in the photographs below are not the type discussed in this thread, the results of the failure are nevertheless typical. One hopes that with new stock the problems of Schaffner filters have been rectified. However, with knowledge of their history, and without any technical reassurance, I would not recommend their purchase.

Peter
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Old 10th Apr 2012, 10:16 am   #9
The Gricer
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

We have found these filter failures more common in instruments that have been switched off for extended periods or that have been previously running on 115V. On quite a few occasions we have had older units back for routine calibration from 115V areas and the filters have failed within minutes of connecting to 240V. Presumably the caps deteriorate but don't actually fail in a way you'd notice. Then having 240 volts across them finishes them off.

It was interesting to see Peter's pictures showing other affected Schaffner filters. Most Solartron equipment (including current production) use Schaffner EMI filters and failure in older equipment is indeed not limited to the FN372-2-21.

For anyone interested a pdf datasheet for the filter can be found here:-
http://www.schaffner.com/en/products...ry-module.html
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Old 10th Apr 2012, 11:25 am   #10
dave cox
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Many thanks to all posters.

Interstingly, I had to replace the line filter in my Solartron 7065 too, that went with a pop and smoke, although nowhere near as bad as this one which took out a 13A fuse in no uncertain terms. To be fair to the manufacturer the switching PSU in the 7065 still works perfectly after 30+ years - most switchers seem to struggle to last 1/10th of that.

It seems this filter IS still manufactured and available although at ~ 30 (including shipping) its too expensive to repair an instrument with a broken LCD and battered case (I have a use for it on GPIB so the lack of display won't matter). I've opted for a cheaper filter / fuse unit (from RS) that I will 'bodge' to fit and wire for 240v only.

Many thanks, dave
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Old 10th Apr 2012, 12:02 pm   #11
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Schaffner IEC line filters were used on HP test equipment and I am aware that vendors selling substantial quantities of "new old stock" HP gear find that the Schaffner filters invariably fail in the first week of operation after coming out of storage.

My personal experience with the filters is only in Australia where the line voltage is 240 to 250V. However, I have been told that Schaffner filter failure is just as common in the USA with its 110V.

It appears that the failure mode is not at all related to the filter's operational hours.

Peter
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Old 10th Apr 2012, 1:17 pm   #12
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

I attacked the failed unit and it appears to be potted with something 'softish' - rather like the consistancy of hardened putty (for window glass). Proably a polymer resin and I would bet that it is this substance than makes all the smoke.

The amount of blackening inside the instrument extends 3 to 5cm in all directions and is an absolute to remove, it resists water, alcohol and propanone (acetone) equally. Water, cotton buds and a lot of scrubbing get if off eventually.

dave
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Old 12th Apr 2012, 2:02 pm   #13
Oldtestgear
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

I have just had two of these filters blow up within the space of 24 hours. I have another couple of 715* meters left - I wonder if these will also let go of the magic smoke next time I switch the meter on?

Nice meters but certainly not worth the cost of new filters. An IEC inlet and a blanking plate is looking like a sensible option for my own use, once I have cleared the stink from my workshop.
Phil
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Old 13th Apr 2012, 8:56 am   #14
dave cox
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Oh, bad luck Phil.

I used a filter / IEC / fuse unit from RS, if I recall, I paid about 10.
It's snap fit (after a few strokes with a file) and looks good quality.

I'll dig the part No out when I get home.

dc
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Old 13th Apr 2012, 9:28 am   #15
GrimJosef
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

I'd be interested to know the RS part number too please.

Cheers,

GJ
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Old 13th Apr 2012, 6:05 pm   #16
dave cox
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Part No's are RS 500-6075 and 500-6211 (the fuse carrier, you need both).

You can admire my handy work below

dc
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Old 14th Apr 2012, 7:17 am   #17
The Gricer
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

For comparison purposes the RS number for the "real thing" is 465-5193, although at 25 it is over twice the price of Dave's solution.
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Old 14th Apr 2012, 9:01 am   #18
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

The RS part - Schaffner FN372-2-21 - is a little over 20 from Mouser in the UK and a little over 15 in the USA http://www.onlinecomponents.com/scha...tml?p=12332112. However the US seller has a $100 international minimum order so you'd need to find someone in the US who was prepared to buy it for you.

Cheers,

GJ
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Old 21st Apr 2012, 1:38 pm   #19
dave cox
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

Sadly, this instrument now seems to be suffering from 'bit rot' as the data coming out the IEEE port seems sort of consistently garbled. For example a working instrument might return "0.000010 V DC" but this instrument might return "2134.334 !V DC". All ranges are mangled in a similar way (the exclaimation mark rather than space, the decimal point in the wrong place and wildly fluctuating readings).

I will swap the EPROM with my working instrument, assuming they have the same hardware.

dc
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Old 21st Apr 2012, 2:14 pm   #20
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Default Re: Schlumberger Solartron 7150 IEC inlet & filter

OK, its not the EPROM.

I should have read the manual (RTFM), the exclaimation mark indicates an overload, thus causing the autoranging to max-out causing the decimal point to move. I likely have a problem in the analogue side or D/A convertor.

dc
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