{"id":7296,"date":"2023-01-06T08:36:32","date_gmt":"2023-01-06T06:36:32","guid":{"rendered":"https:\/\/hex.ro\/wp\/?p=7296"},"modified":"2023-01-07T17:50:00","modified_gmt":"2023-01-07T15:50:00","slug":"citizen-2400-30-mini-crt-2","status":"publish","type":"post","link":"https:\/\/hex.ro\/wp\/blog\/citizen-2400-30-mini-crt-2\/","title":{"rendered":"Citizen 2400-30 \u2013 mini CRT (2)"},"content":{"rendered":"\n

I found this CRT inside a Nikon VN-7000 Video Camera that I have bought recently from the flea market. I wasn’t looking to buy a camera, but this one was interesting, since I was convinced is a Sony. Looking closer, it was a Nikon! I don’t remember even taking a Nikon apart, and confused by my mistake, I decided to buy it.<\/p>\n\n\n\n

Now that I took it apart, my confusion was justified. It is identical to the Sony CCD-TR705E<\/a>, down to the exact model of the CRT.<\/p>\n\n\n

Camera overview<\/h2>\n\n\n

Camera looks clean with no traces of battery corrosion. And just like the Sony, the top plastic started deteriorating – but at least it was not so sticky.<\/p>\n\n\n\n

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Nikon VN-7000<\/figcaption><\/figure>\n\n\n\n

I’ve tried to power it on with a current limited power supply, but it would just flash the screen and go dead again.<\/p>\n\n\n

Opening up<\/h2>\n\n\n

Opening up was easy. Surprisingly I found no date codes stamped inside the plastic panels. I finally found one inside the Electronic Viewfinder.<\/p>\n\n\n\n

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Nikon VN-7000 – Inside View<\/figcaption><\/figure>\n\n\n\n

I had to also recuperate the little plug where the EVF connects to, so that I can provide the signals for it using some tiny clamps.<\/p>\n\n\n\n

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Nikon VN-7000 – EVF Connector desoldering<\/figcaption><\/figure>\n\n\n

Electronic View Finder<\/h2>\n\n\n

This was more tricky to take apart since even if it only has two screws, it is closed very tightly. I finally found a small gap where I could start to pry it off.<\/p>\n\n\n\n

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Citizen 2400-30 CRT inside a Nikon VN-7000 EVF Unit<\/figcaption><\/figure>\n\n\n\n

Unlike Sony, the capacitors here did not leak and were measuring small ESR values. I took the board out to find that the driver IC is an AN2512S:<\/p>\n\n\n\n

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AN2512S<\/figcaption><\/figure>\n
Nikon VN-7000 – EVF Board driven by AN2512S<\/figcaption><\/figure>\n\n\n\n

Identifying the signals was easy, the first Pin (white) beeped a bit when probing (which usually indicates VCC, as the filter capacitor is charging). Second pin had continuity to the external of the Flyback Transformer – so most likely GND. And third pin was Video IN. The 4th pin turns on the two recording LEDs.<\/p>\n\n\n\n

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Nikon VN-7000 – EVF Connection Diagram – RED = VCC, Black = GND, Yellow = Video IN<\/figcaption><\/figure>\n\n\n\n

While the CRT has plenty brightness – the image is slightly shifted upwards, hiding the top bar of the Raspberry PI Desktop. The 4 potentiometers on the driver board do not seem to have an impact on the Vertical Positioning, only on Vertical size ..<\/p>\n\n\n\n

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The sharpest image is around 5.17V where the device draws 80mA.<\/p>\n","protected":false},"excerpt":{"rendered":"

I found this CRT inside a Nikon VN-7000 Video Camera that I have bought recently from the flea market. I wasn’t looking to buy a camera, but this one was interesting, since I was convinced is a Sony. Looking closer, it was a Nikon! I don’t remember even taking a Nikon apart, and confused by […]<\/p>\n","protected":false},"author":1,"featured_media":7336,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49,35],"tags":[96,60,75,178],"class_list":["post-7296","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-crts","category-flea-markets","tag-2400-30","tag-an2512s","tag-citizen","tag-nikon"],"_links":{"self":[{"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/posts\/7296","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/comments?post=7296"}],"version-history":[{"count":6,"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/posts\/7296\/revisions"}],"predecessor-version":[{"id":7338,"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/posts\/7296\/revisions\/7338"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/media\/7336"}],"wp:attachment":[{"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/media?parent=7296"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/categories?post=7296"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hex.ro\/wp\/wp-json\/wp\/v2\/tags?post=7296"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}