Amplifone image issues - video inside

[jehuie]

Ok I need help clarifying this to see if I'm reading it right. I don't know the numbering scheme on the neck pins so I'm not sure I'm reading it right. Is the first one Ground and then 2nd to the last two both heater pins as shown?

In any case, I'm getting continuity between the heater pins and that first pin on the left. That's not a good thing is it?

 

[omegaman]

Oh dear, you could try placing the tube on its face and gently tapping the side of the neck with the handle of a screwdriver. It's worked for me before.

 

[Mike Doyle]

When you rebuilt your boards, did you pull and replace all those "W" jumpers?

They're zero ohm resistors and should be removed and replaced with a scrap of cap leg. There's also one on the HV board IIRC.

I chased similar problems on an untested set once, turned out to be a wonky W jumper.

 

[jehuie]

When you rebuilt your boards, did you pull and replace all those "W" jumpers?

The jumpers have been replaced.

Oh dear, you could try placing the tube on its face and gently tapping the side of the neck with the handle of a screwdriver. It's worked for me before.

I tried that after you mentioned it but no luck. So I'm correct that there should be zero continuity between those pins? How serious is this? Would it be something a rejuvinator might fix?

 

[jehuie]

You know, the more I think about it the more I don't think this would cause the bright spot in the middle problem. The heater doesn't have anything to do with the Z-signal right? I'm thinking this is a red herring.

 

[dezbaz]

Ok I need help clarifying this to see if I'm reading it right. I don't know the numbering scheme on the neck pins so I'm not sure I'm reading it right. Is the first one Ground and then 2nd to the last two both heater pins as shown?

In any case, I'm getting continuity between the heater pins and that first pin on the left. That's not a good thing is it?

Monitor diagram (Click for larger)


pin numbers

 

[dezbaz]

From Here
http://www.ultrathegame.com/tempest/6100_faq.pdf

Pin 4 not used

 

[jehuie]

Thank you so much for that picture. The numbering sure isn't intuitive is it? So I had it wrong and that pin isn't used....so it's not the cause of my problem.

That''s good since I'd rather not replace the tube. But now I'm kinda out of ideas. Could a bad diode in the neckboard cause something like this perhaps if it keeps the ground wire from connecting properly?

 

[dezbaz]

Thank you so much for that picture. The numbering sure isn't intuitive is it? So I had it wrong and that pin isn't used....so it's not the cause of my problem.

That''s good since I'd rather not replace the tube. But now I'm kinda out of ideas. Could a bad diode in the neckboard cause something like this perhaps if it keeps the ground wire from connecting properly?

Neck Board??

Amplifones don't nave a neckboard

Maybe you have a WG6100 Monitor?

 

[jehuie]

Neck Board??

Amplifones don't nave a neckboard

Maybe you have a WG6100 Monitor?

Well, not a neck board...not sure what to call it. The round do-dad that connects to the neck and has all the wires attached to it. It has diodes between the wires coming in and the connector itself.

 

[dezbaz]

Well, not a neck board...not sure what to call it. The round do-dad that connects to the neck and has all the wires attached to it. It has diodes between the wires coming in and the connector itself.

Mmmm, are you sure.

Diodes?

If they do, there is nothing in the diagram

 

[jehuie]

Mmmm, are you sure.

Diodes?

If they do, there is nothing in the diagram

Nope...no diodes. I popped the cover off and looked again and they are resistors. I don't know what the values are since I'm rather color blind so I'll need to get my wife out there to tell me what they are. But they aren't open in any case.

Somehow I think I'm looking in totally the wrong place though. I'm thinking I screwed something up on the deflection board but I don't know where to look. Nothing has changed....same bright dot in the middle but other graphics all look good.

 

[dezbaz]

1. Focus: 10KΩ: Brn, Blk, Or
5. G1 (control grid) 2.2KΩ: R, R, R
7. G2 (Screen grid; brightness) 2.2KΩ: R, R, R

I did not know they were there

Glad you told me as I will need that info on a project I am working on

So, good luck measuring, hope it's just one of them faulty . . .

 

[dezbaz]

 

[jehuie]

1. Focus: 10KΩ: Brn, Blk, Or
5. G1 (control grid) 2.2KΩ: R, R, R
7. G2 (Screen grid; brightness) 2.2KΩ: R, R, R

I did not know they were there

Glad you told me as I will need that info on a project I am working on

So, good luck measuring, hope it's just one of them faulty . . .

Thanks for making that easier for me! Checked and they are all fine. Drat.

 

[omegaman]

I didn't know they were there either.....On some HV boards the connector is a different style.

 

[jehuie]

Since I don't have any other idea for tracking down the bright spot in the middle I'm just randomly going through the deflection board and testing individual components.

In doing so I noticed that C2 and C12 actually have resistor in them instead of the capacitors listed in the parts list. Is that normal?

 

[SaminVA]

Since I don't have any other idea for tracking down the bright spot in the middle I'm just randomly going through the deflection board and testing individual components.

In doing so I noticed that C2 and C12 actually have resistor in them instead of the capacitors listed in the parts list. Is that normal?

They look like resistors but their really capacitors. The service manual list them as 0.0047uf,+-10%,50V ceramic-disc Axial-lead capacitors but I think the disc part is a misprint as I don't think I ever seen a Disc cap with Axial leads.