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Tech Chat Thick Films

 
crustytv
(@crustytv)
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Posts: 11262

At the end of the rainbow is a pot of Gold....... or in this case Thick films.

I'm going to need to enlist the assistance of Jim and especially John with his encyclopedic memory of all things Thorn. They arrived and there are as expected a number for the 4000. I've not consulted the service manuals yet, and I expect part codes may have changed upon revisions. So get your eagle eyes out, boys. Nice to have the missing TF403 which is now happily sitting on my Franken-Vertical-Deflection.

I recognise some of the 9K like the OVP's but not up on all of them.

Looks like some Sharp and other manufacturers who also went done the TF route.

20211220 125743
20211220 125749
20211220 125818
20211220 125839
20211220 125847
20211220 125857
20211220 125907
20211220 130035
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Topic starter Posted : 20/12/2021 2:13 pm
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jcdaze
(@jcdaze)
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That is certainly a great collection there. 

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Posted : 20/12/2021 2:51 pm
crustytv
(@crustytv)
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I believe I have now identified all the 4K TF's.

4ktfs
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Topic starter Posted : 20/12/2021 4:07 pm
Nuvistor
(@nuvistor)
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@crustytv 

Good grief, the ones I saw in the RGB Collector loads gave enough trouble and there was only one TF in those sets, no wonder the 4000 got a reputation.

 

 

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Posted : 20/12/2021 10:44 pm
Jayceebee
(@jayceebee)
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In the last two pictures they appear to be VCRs types. The green ones were often seen in various JVC based machines, the black one's with the HA11xxx IC would be found in Panasonic models. Unsure about the small Sharp units but I would also bet VCR.

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Posted : 20/12/2021 11:00 pm
Red_to_Black
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Yes, early Sharp vcrs (VC8300/VC9300) certainly used TF modules in the motor drive circuits IIRC

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Posted : 20/12/2021 11:07 pm
crustytv
(@crustytv)
Vrat Founder Admin
Posts: 11262
Posted by: @nuvistor

Good grief, the ones I saw in the RGB Collector loads gave enough trouble and there was only one TF in those sets, no wonder the 4000 got a reputation.

Indeed

The tally:-

  • 7 TFU's on the Hoz timebase
  • 3 TFU's on the Vert timebase
  • 5 TFU's on the signals board
  • 6 TFU's on the convergence Neck module
  • 1 TFU on the handheld convergence unit

 

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Topic starter Posted : 20/12/2021 11:24 pm
Red_to_Black
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Thorn seemed to have a penchant for TF technology, even as late as the TX10 chassis which didn't use modules with active components as such, nor to the extent of the earlier chassis however they still used quite a few TF resistors on this chassis, by contrast the later TX100 and newer chassis they seemed to have dispensed with them altogether. The TX9 did not seem to use them either.

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Posted : 21/12/2021 12:11 am