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Old 4th Dec 2023, 9:11 pm   #1
dougietamson
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Default Rogers Type S324 Low Distortion AF sig gen

I've got one of these on the bench to get back to life, will be used in my local mens shed 'repair shop', we are low on test equipment.

1st thing is I have no idea how to get the case open, anyone come across one of these before.

Add from WW 1973 attached and some photos.

Doug
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Old 4th Dec 2023, 9:34 pm   #2
frsimen
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Does the case slide off if the feet or any screws underneath are removed?
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Old 4th Dec 2023, 9:43 pm   #3
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Undo the screw on the front above the on off switch and the back of the case should slide off.
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Old 4th Dec 2023, 9:48 pm   #4
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Default Re: Rogers Type S324 Low Distortion AF sig gen

That looks like an adjustment hole for a screwdriver to me. The chassis definitely slides out from the front though, perhaps the big screw on the rear panel secures it?
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Old 4th Dec 2023, 9:54 pm   #5
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Default Re: Rogers Type S324 Low Distortion AF sig gen

No it’s not an adjustment hole, it is a long screw that goes through to the back of the case, it appears on several Rogers instruments I have worked on.
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Old 4th Dec 2023, 10:13 pm   #6
dougietamson
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Thanks for the info.

1st thing I did was to removed the 4 feet thinking that would be the key, no joy.

The large round screw at the back turns but feels like it's not doing anything.

I'lll try the front screw tomorrow.

There's some loose parts inside, hope not too terminal.
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Old 4th Dec 2023, 11:31 pm   #7
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Quote:
Originally Posted by Station X View Post
That looks like an adjustment hole for a screwdriver to me. The chassis definitely slides out from the front though, perhaps the big screw on the rear panel secures it?
I was thinking the same as you, Graham, but the legend around the hexagonal chromed escutcheon says "unlock", with an arrow pointing anticlockwise. So I think Chris is right
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Old 4th Dec 2023, 11:48 pm   #8
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Suggest gently prising off the metal caps on each end of the handle. There may be screws hidden underneath the caps.
This is the arrangement on the Sugden oscillator, this unit may be similar. The same arrangement on Farnell power supplies, iirc.
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Old 5th Dec 2023, 8:13 am   #9
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Quote:
Originally Posted by Wellertcp View Post
Suggest gently prising off the metal caps on each end of the handle. There may be screws hidden underneath the caps.
This is the arrangement on the Sugden oscillator, this unit may be similar. The same arrangement on Farnell power supplies, iirc.
That was my final though before asking for help, so had a 'go' at them, they didn't feel like co-operating so gave up.
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Old 5th Dec 2023, 9:21 am   #10
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Quote:
Originally Posted by Nickthedentist View Post
Quote:
Originally Posted by Station X View Post
That looks like an adjustment hole for a screwdriver to me. The chassis definitely slides out from the front though, perhaps the big screw on the rear panel secures it?
I was thinking the same as you, Graham, but the legend around the hexagonal chromed escutcheon says "unlock", with an arrow pointing anticlockwise. So I think Chris is right
I stand corrected.

I don't see where it says "unlock" though.
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Old 5th Dec 2023, 9:43 am   #11
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Ah, I couldn't either, but I did a Google image search for a Rogers S324 which led to an online auction with excellent close-up pictures:
https://www.ebay.co.uk/itm/276145556755
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Old 5th Dec 2023, 10:11 am   #12
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Thanks to the help here I've got it open

Chris was spot on with the 'unlock' screw.

The rattle was from the mains PSU not being attached to the back of the case and its 2 screws rattling around, I've screwed the PSU back in place.

I've added more photos.

Next up is to check the PSU for any surprises.

Doug
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Old 5th Dec 2023, 10:38 am   #13
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Default Re: Rogers Type S324 Low Distortion AF sig gen

If it's going into general usage in a workshop, a set of test leads with a good high voltage blocking capacitor along their way might be a wise next job. No telling where someone will go probing with it!

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Old 5th Dec 2023, 11:19 am   #14
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Default Re: Rogers Type S324 Low Distortion AF sig gen

Quote:
Originally Posted by Radio Wrangler View Post
If it's going into general usage in a workshop, a set of test leads with a good high voltage blocking capacitor along their way might be a wise next job. No telling where someone will go probing with it!

David
Good idea, the 'repair shop' has been running for about 2 years, most of the items are garden tools, lamps, coffee tables etc but the odd radio/audio item does appear.

I was asked to look at a 1962 Civic tape recorder that someone had tried to fix, I had to bring it to my 'lab' as we only had a cheap multimeter and a soldering iron at the shed workshop.
We've since acquired an old Hameg CRO, bench power supply and a proper meter and I built a lightbulb limiter.
These items are 'hidden' in a cupboard.
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Old 5th Dec 2023, 11:55 am   #15
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Default Re: Rogers Type S324 Low Distortion AF sig gen

The PSU looks very clean, filter caps are in good condition, 3 transistors and, I assume, a trim pot to adjust the voltage.
PSU states 18vdc output, I measured 17.8vdc while on the bulb limiter with no load, close enough.
I connected the PSU to the unit and powered on, no smoke, then adjusted the trim pot to get 18vdc under load, clean sine wave on the scope.

Doug
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Old 6th Dec 2023, 5:55 pm   #16
DMarchesi
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Default Re: Rogers Type S324 Low Distortion AF sig gen

i nearly bought that on ebay myself, good luck with the restoration
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