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PostPosted: Tue Feb 09, 2021 5:06 am 
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Hi,

There's a discrepancy between the builder's guide and the layout/schematic documents where the OD trim pot is shown with conflicting wiring diagrams.

My OSD kit came with these printed documents:

    Amp Builder's Guide Ver. 1.28
    OSD Layout rev. 20
    OSD Schematic rev. 14

The layout and schematic are the same, and show pin 1 to ground. The builder's guide diagram is different and shows pin 3 to ground on page 70. The description in the builder's guide says "connect the 220k resistor with a yellow lead to terminal 3 of the 250k trim control", in agreement with the layout/schematic.

My guess is that the schematic, layout, and instructions are correct and that the builder's guide diagram is wrong, but can someone confirm this please?

Thanks!


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PostPosted: Tue Feb 09, 2021 5:39 am 
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The plot thickens... On page 68 of the builder's guide there is a diagram with the label "W. TO TRIM 1" meaning: connect the 220k resistor with a white lead to terminal 1 of the 250k trim control.

To summarize the conflicting information:

Builder's guide p.70: "Connect the 220k resistor with a yellow lead to terminal 3 of the 250k trim control."
Build guide p70: diagram shows pin 1 to 220k resistor.
Build guide p68: diagram shows pin 1 to 220k resistor.
Schematic / layout: both show pin 3 to 220k resistor.

Help!


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PostPosted: Tue Feb 09, 2021 5:25 pm 
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1) I can only find Rev. 10 of layout, 2) the color of the wire from 220K resistor ON the board doesn't matter; the wire from 220k on the board goes to lug 1 on Trim pot, 3) I would wire it as shown in Build Guide and Layout. You can PM Coco thru the User Control Panel, I think that the lug numbers for the Trim pot on the schematic are probably reversed and incorrect! You may have found an error :thumbsup: that Coco (Stephen) needs to correct. And I agree the color discrepancy of the wires (Wht.,Y or Org) and numbering on lugs for Trim pot in Build manual are confusing. Hope your able to get it sorted out w/ Coco. PS Diagrams in Build Guide and Layout correspond: the wording (paragraphs 5 and 6) doesn't!!

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PostPosted: Tue Feb 09, 2021 6:54 pm 
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Thanks for the input. However, part of what you said is incorrect: "PS Diagrams in Build Guide and Layout correspond." That's not in fact true!

Layout diagram shows pin 1 to GND, which means the Build Guide and Layout do not correspond!:

Image

Build guide pg.70 shows pin 3 to GND:

Image

Just for completeness here's the schematic (pin 1 to GND):

Image

In contrast, build guide pg.68 has pin 1 to the 220k resistor (please ignore my correction in red):

Image

I'll ping Stephen to see if we can get the final word on this. Thanks!


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PostPosted: Wed Feb 10, 2021 12:17 pm 
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The change was made because the trim was wired in reverse so it was a simple matter of switching the leads to pin 1 & 3 to correct it. (Worked but in reverse)

Attachment:
TRIM.JPG
TRIM.JPG [ 20.17 KiB | Viewed 5029 times ]


Correct Layout here: https://www.trinityamps.com/docs/OSDLayout20.pdf

Builder's Doc updated as well and posted here: https://www.trinityamps.com/docs/OSDBui ... de1291.pdf

No change to schematic.

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PostPosted: Thu Feb 11, 2021 3:11 am 
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Thank you!


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PostPosted: Thu Feb 11, 2021 8:39 am 
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Sorry to take so long to respond.

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