Hallicrafter 509 image shifted horizontally

[old_tv_nut]

This is almost certainly not a problem in the IF, as the H sync and blanking looks normal in the picture.

I think the problem would be somewhere in the H sync waveform or H sweep waveform being fed to the H phase detector.

Can you post a link to a schematic for that section?

[ohohyodafarted]

Originally Posted by old_tv_nut

This is almost certainly not a problem in the IF, as the H sync and blanking looks normal in the picture.

I think the problem would be somewhere in the H sync waveform or H sweep waveform being fed to the H phase detector.

Can you post a link to a schematic for that section?

Tried to post it on VK but file is too big. I looked for it on the web but my set differs from the Sams which is posted at the ETF site and the OEM schematic is of poor quality at the ETF site.

I have an old email address for you. I will try to send it to that address.

Thanks Wayne
Bob Galanter

[old_coot88]

Assuming the scan frequency is correct, could there be a DC bias current running thru the yoke winding? Just a SWAG.

[old_tv_nut]

Originally Posted by old_coot88

Assuming the scan frequency is correct, could there be a DC bias current running thru the yoke winding? Just a SWAG.

A DC current would shift the raster sideways, not wrap it around.

Bob and I have started an email exchange. I think the problem is somewhere around the sync discriminator or its inputs.

[Electronic M]

Originally Posted by old_tv_nut

A DC current would shift the raster sideways, not wrap it around.

Bob and I have started an email exchange. I think the problem is somewhere around the sync discriminator or its inputs.

I agree. The H osc appears to be locking to the sync, but locking to it out of phase. The horizontal phase detector/horizontal AFC circuit is probably the issue though if the sync or sweep signals feeding it are somehow phase shifted that could also do it.

[old_coot88]

Originally Posted by old_tv_nut

A DC current would shift the raster sideways, not wrap it around.

Right you are. That was a senior moment/brain fart on my part. Dumb, dumb.

[ohohyodafarted]

Originally Posted by old_tv_nut

A DC current would shift the raster sideways, not wrap it around.

Bob and I have started an email exchange. I think the problem is somewhere around the sync discriminator or its inputs.

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This is what Wayne wrote to me................

Thanks. First let me say I never have trouble-shot one of these, so I can only make suggestions based on general principles.

Let me know: Do you want to proceed by email or on Video Karma? If VK, please copy the following there. It might be the best way to get someone with particular experience to help.

Have you tried subbing v11 and V12? Can you poke around this area with a scope?

The left half of V11 separates the sync. I’d guess it’s OK because you have vertical sync.

The right half of V11 is the phase inverter. One polarity is on the anode and feed the vertical circuit and the upper half of the sync discriminator.

The opposite polarity should be on the cathode of the inverter (R74) and feeds the lower half of the sync discriminator. A scope should show equal and opposite polarity waveforms at left sides of C58 and C59.

There should be a horizontal waveform of some kind coming through C61 and shaped by C60 and R79. I don’t know if it should be a pulse or a sawtooth wave or what on C60, but I’m thinking sawtooth more or less. If I understand the circuit correctly, the pulses from the sync phase inverter should be occurring in the center of the sawtooth, creating a neutral control voltage out of the sync discriminator and making the horizontal sweep line up with sync.

If V11 and V12 are good, I would check components in this area. Anything connected to right half of V11; anything connected anywhere on V12.

(FYI Vert sync is fed to the vertical oscillator through R75 and the following R/C integrator components to filter out the H sync and transmit a vertical pulse.)

Regards,

Wayne

[ohohyodafarted]

This set is quite problematic for a couple of reasons:

1. The set has been worked on and I am not certain what is original and what is factory. I have found some replacement components that are incorrect values

2. I have both the Sams and the OEM Halicrafters schematics. The Sams reflects later wiring and component values, and the Hali is earlier which more closely resembles my chassis. However neither schematic totally reflects what my chassis is.

3. The set has a separate power supply with HV flyback and B+ supplies. There are 4 multi pin connector cables going back and forth and trying to follow what all the wires do is quite a challenge not to mention trying to relate all these wires and connector pins on the schematic.

With that in mind I spent about 10 hours comparing the main chassis against both schematics. I decided that I would use mostly Halicrafter schematic values. However even then, there are a few changes that match only the Sams and are obviously production changes that are not reflected on the Hali schematic. So it's a mishmash but mostly like the Hali schematic.

I did find a few resistors that were out of range and at least one 1meg that was open. But when I powered the set back up, I now only have a raster without any video information.

I have not been able to work on the set powered up due to the cabling issues between the 2 chassis. My next step will be to devise some method of working on the chassis live. At that point I will attempt to see if I have lost B+ somewhere that may have caused the video to disappear.

I will post again after working on the chassis live so I can take some measurements. I suspect working on it live will be more fruitful.

Thanks for all your help.

[Kevin Kuehn]

I looked at the schematic in Riders and expect it's the same as your factory. Here's a few pages from Kiver explaining this basic horz AFC circuit along with an easier to follow schematic in figure 16. Requires a pulse from the horizontal output transformer.

[John Marinello]

A better, or more recognizable video display might be helpful as well. What you have there is so washed out, hard to tell what's going on. If it were just a phase issue, then I would expect you would have a decent image on either side. Try injecting video directly.