Photo of my TC-2048

A place to discuss the ZX80's and ZX81's younger brother - the Sinclair ZX Spectrum
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Kahenraz
Posts: 11
Joined: Mon Feb 10, 2020 2:06 pm

Photo of my TC-2048

Post by Kahenraz » Tue Feb 11, 2020 11:58 am

Had this beautiful item shipped in from Portugal. Gave it a good cleaning before setting it up for a photo.

Forgot to buy a power supply so it's just sitting pretty here until then.
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IMG_20200207_073049.jpg

Kahenraz
Posts: 11
Joined: Mon Feb 10, 2020 2:06 pm

Re: Photo of my TC-2048

Post by Kahenraz » Sun Feb 23, 2020 4:05 am

Tested it today and everything works great except for the TV output (composite monitor output works fine).

I'm very happy with the computer as it is. The seller was very accommodating and helpful.

Are there any use cases where the TV output would be desirable? I can't think of any, other than actually hooking it up to an old TV.

McKlaud
Posts: 275
Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: Photo of my TC-2048

Post by McKlaud » Sun Feb 23, 2020 8:23 am

Hi,

Your TC2048 looks nice and I like the bright and good looking keyboard.

Anyway, there could be an issue with the RF modulator if the composite output works fine. The most accurate schematic diagram of rev.5 attached.
Attachments
TC2048 rev 5
TC2048 rev 5
Claudius
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Sinclairs-great
Posts: 28
Joined: Wed Nov 06, 2019 1:37 am

Re: Photo of my TC-2048

Post by Sinclairs-great » Sun Mar 08, 2020 3:23 am

@Kahenraz what are the games like for it and what made you want one of them

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1024MAK
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Location: Looking forward to summer in Somerset, UK...

Re: Photo of my TC-2048

Post by 1024MAK » Sun Mar 08, 2020 10:12 am

Kahenraz wrote:
Sun Feb 23, 2020 4:05 am
Are there any use cases where the TV output would be desirable?
Desirable? No!

If the composite video works fine, then I would not worry about it.

Which type of modulator is it? Which frequency does it modulate the video signal on to?

Mark

McKlaud
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Joined: Tue Dec 19, 2017 10:02 pm
Location: St Albans, UK

Re: Photo of my TC-2048

Post by McKlaud » Wed Mar 18, 2020 8:18 am

The hi-res schematic attached in the ZIP file.

Regarding Mark's query, any European TC2048 has got a UHF modulator which works on Channel 36. Timex used at least two makes of them, ASTEC UM1233 and Gintek UM-236E-1.

Image
Attachments
TC2048 rev. 5 v1_3.jpg.zip
schematic diagram
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Last edited by McKlaud on Sun Mar 22, 2020 10:06 am, edited 1 time in total.
Claudius
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1024MAK
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Location: Looking forward to summer in Somerset, UK...

Re: Photo of my TC-2048

Post by 1024MAK » Sun Mar 22, 2020 9:54 am

Claudius

Thanks for that information and for the hi-res schematic 8-)

Mark

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