Problem with Canberra Series 30

This area is for discussions involving any fusion related radiation metrology issues. Neutrons are the key signature of fusion, but other radiations are of interest to the amateur fusioneer as well.
DaveC
Posts: 2346
Joined: Sat Jun 30, 2001 1:13 am
Real name:

Re: Problem with Canberra Series 30

Post by DaveC »

Daniel -


Your English is much better than my German, that's certain.

Hope you can get your unit operating... Mine is an old 8100 and is "cranky", when unused for a while... almost always, board-edge contacts. So perhaps pulling everything out, carefully, cleaning the contacts (be sure to be grounded for the ESD protection) and re-inserting everything, will help.

Dave Cooper
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

richnormand wrote:I have (somewhat poor but usable) scans in pdf of the service manual for the series 30 if you are interested.
Hi, if possible, send me a pdf copy of this service manual. I've one Canberra series 30 in repair. Many tanks for all!!
Dario
richnormand
Posts: 307
Joined: Sat Aug 27, 2005 8:30 am
Real name: rich normand

Re: Problem with Canberra Series 30

Post by richnormand »

Hi Dario,

just saw your post today. I'll retrieve the pdf and put it here.
EDIT: Just tried and got the "file is too big" message.
:-(

Can you send me another email address that would accept about 7Meg of attachments?
You can PM me the info on fusor mail.
richnormand
Posts: 307
Joined: Sat Aug 27, 2005 8:30 am
Real name: rich normand

Re: Problem with Canberra Series 30

Post by richnormand »

Just sent you the pdf via your email.
Let me know if you dont get it OK.
Cheers.
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

Hi Richard,
Update: on my unit, power supply ok but no video. I checked and there is a problem in the transistor that drives the high voltage transformer (Q414).
I tried to replace it with another PNP that I had (MJ2955). Now picture appears but not sharp and not fill the screen. Of the transistor, fixed laterally there is another equal, with only junction BC connected on junction CE of the first (but on the scheme only one transistor is indicated). The original transistors have only the inscription "91278" and do not know what they match. Do you have any idea?
20170204_154043.jpg
richnormand
Posts: 307
Joined: Sat Aug 27, 2005 8:30 am
Real name: rich normand

Re: Problem with Canberra Series 30

Post by richnormand »

Looks like you do have video but the hv drive of your module looks like it is off and out of focus (difficult to say on the photo).

I'll look in mine to find out what transistor actually is.

I did change Q310 (vertical) on mine but your Q414 is in charge of the horz deflection as well as driving the flyback for the HV. That would also affect focus, linearity and sweep width. Looks like getting proper gain and ce current matters here. Aslo worth looking at CR406, C438 CR103 and CR104 while you are in there. In particular if CR406 is open Q414 will have a difficult life! Check for the 100V at C440.

Remember that horz and vert sweep is at 90 degrees on this. The deflection yoke is installed 90deg from what would be expected in a regular television. Each up/down sweep is one of the 512 channel (that is why you have to go to magnify to see all of the 1024).Thus the "horz" sweeps from top to bottom here. From that point of view then your horz and vert widths are off also. That would be the "vertical" circuit. Do you get a response from the focus adjustment? A problem common to both deflections could be two separate issues or a common issue like power supply. Are the 12V and 30V supplies OK?

Monitor unit is from Elston Electronics Corp. Phelps N.Y. 14532, model DMIO-09B0-119-A39. Check to see if it is the same as in the schematics. They could have different suppliers for this generic module.

Best of luck with it. If you get really stuck I could open my unit and take some voltage measurements and scope waveforms for you.


for reference here are some photos when I power mine.
3) with top indications (seem you have those) and the lines at area of interest . You clear those with the "ROI Clear" below the CRT.
2) The dots are random garbage in the memory. You clear those with the "Clear data" on the main panel.
1) You are then left with the top and bottom lines, initial channel on left and numeric data on top.
Attachments
ready to go
ready to go
data junk
data junk
random ROI and data on startup
random ROI and data on startup
richnormand
Posts: 307
Joined: Sat Aug 27, 2005 8:30 am
Real name: rich normand

Re: Problem with Canberra Series 30

Post by richnormand »

Too late to edit my previous post:
"I'll look in mine to find out what transistor actually is."
Looks like the same number but difficult to actually read. No clear reference on Google either.
John Futter
Posts: 1848
Joined: Wed Apr 21, 2004 10:29 pm
Real name: John Futter
Contact:

Re: Problem with Canberra Series 30

Post by John Futter »

could be a fast power darlington

you need a good one to measure
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

Further work: I replaced a pair of trimmers and some capacitors. Now the image is in place, however, there is another problem .... the image, as time goes by, begins to have a flicker (especially visible in character, a kind of ripple) which becomes more and more visible.
IMG_3557.JPG
IMG_3558.JPG
IMG_3559.JPG
Dario
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

This is the link for video: https://www.youtube.com/watch?v=QFi9G9N ... e=youtu.be
the quality is bad, but you see the problem.
I also tried to cool the various components to see if the problem is due to something that works badly or has problems, but nothing changes.

Dario
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

Ok, I solved the problem, I'm just stupid. To give the supply voltage in the safety, at the instrument under test, I use a 230/230 isolation transformer and a variac with which the straight edge voltage, starting from a hundred volts, and if there are no problems the increased up to the operating voltage.
This caused the flickering image, I connected the device directly to the supply network, and now the picture is still beautiful and everything ok.
richnormand
Posts: 307
Joined: Sat Aug 27, 2005 8:30 am
Real name: rich normand

Re: Problem with Canberra Series 30

Post by richnormand »

Nice to hear, congrats.
I guess your next steps is to test the ADC in PHA mode and see if the front-end is OK.
Do you have a scintillator/photomultiplier with a HV supply handy?
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

Tanks. Yes, I've this:
IMG_2520.JPG
IMG_3287.JPG
IMG_3478.JPG
Dario
richnormand
Posts: 307
Joined: Sat Aug 27, 2005 8:30 am
Real name: rich normand

Re: Problem with Canberra Series 30

Post by richnormand »

Very nice indeed! You seem to have a very nice lab.

Please post your test result once everything is working well.
You could use the K40 1.46MeV line from a box of salt substitute from the grocery store.
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

Tank you, no problem, I've many sample source for test. This isn't my first MCA :-)
I hope the weekend to do some testing and then post the results.

Dario
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

Hi, I did a little test of the instrument, it seems okay.
I put the picture of a pair of spectrum.
IMG_3562.JPG
IMG_3564.JPG
Dario
User avatar
dario_tortato
Posts: 13
Joined: Fri Jan 13, 2017 4:34 pm
Real name: Dario Tortato
Location: Marcon (Venice) - ITALY

Re: Problem with Canberra Series 30

Post by dario_tortato »

After the work of arrangement, some aesthetic restoration:
IMG_3600.JPG
Dario
Post Reply

Return to “Neutrons, Radiation, and Detection (& FAQs)”