TR7A Service manual serching.
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I would like to get copies TR7 schematics ( not 1976 realise but the last 1982).? Does anyone know if such exist somewhere? Haven't found anything online as yet.
last TR7 ( SN 9XXX) and TR7A(10XXX)? are not realy different but without schematics troobleshoting is not easy! sorry for my poor english or am¨¦rican? but i'm sure you will understand my request! best 73" Fran?ois F1FPG |
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This may be the latest one I have in PDF. Unfortunately the people who scan these tend to leave out the page that has the publication date. if the attachment does not come through you should be able to find it on the internet.
The major changes were to the Predriver, 2nd IF/Audio board and the Digital Control board. The new version of the Digital Control board is not in this manual but I may have it as a separate file. There were also some changes to the 2nd Mixer board but I think the later revisions are in most rigs except the very oldest and most of the changes are in the published manuals. I do have most of the 2nd Mixer changes documented, as well as some of the known 2nd IF/Audio changes. There are a couple of resistor changes on the PBT/Ref board to support the version 2 2nd IF/Audio board but otherwise it seems essentially unchanged. The TR-4310 service manual has some newer info if you can find one. I think my paper reproduction has some later info but I would have to check it. I don't recall who I purchased it from. 73 -Jim NU0C On Mon, 08 Apr 2024 06:33:30 -0700 Fran?ois F1FPG via groups.io <fra.gab@...> wrote: I would like to get copies TR7 schematics ( not 1976 realise but the last 1982).? Does anyone know if such exist somewhere? Haven't found anything online as yet. |
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Attached, version 2 digital control board. They changed to a PROM for the default band logic.
73 -Jim NU0C On Mon, 08 Apr 2024 06:33:30 -0700 Fran?ois F1FPG via groups.io <fra.gab@...> wrote: I would like to get copies TR7 schematics ( not 1976 realise but the last 1982).? Does anyone know if such exist somewhere? Haven't found anything online as yet. |
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Take a look on page 2-7 (two times in the PDF) where you might find what a are looking for.
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Karl, DK7AL On 08.04.24 18:47, jerry-KF6VB wrote:
On 2024-04-08 09:39, Gary Follett wrote:You¡¯d need to cross-correlate the data to Yaesu but there is band*** I'll need to look into that.? Could possibly do it with a diode |
Fran?ois F1FPG
Jim Shorney
Karl du Roi, DK7AL