Have you seen this Amplifone mod?

Talon2000

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I've got a 13" Amp, that I just put a new HVT in. Problem with the picture is that all colors line up producing white graphics. The RGB is not seperated, also the blanking circuit doesn't appear to be working properly either as I can not adjust the brightness, or screen to remove the retrace lines.

I'm wondering if it may have something to do with this mess on here.

Yellow wire going to pin 8 of the head on the deflection board, going to the neck board.
Then it looks like r12 get's isolated from a ground plain only to be connected to the yellow wire seen, which re-grounds it?


13amp%20003.jpg


All the returns are cut, the RGB wires go to the return, and the w/brown wire is cut as well.

13amp%20006.jpg

13amp%20007.jpg
 
Yes. I believe he connected the input to the wrong connector. The PAT9000 uses a different connector than what you think it should use. You might email Kevin and find out.
 
Yes. I believe he connected the input to the wrong connector. The PAT9000 uses a different connector than what you think it should use. You might email Kevin and find out.

This is confusing. The PAT has two video connectors, clearly labeled "Raster" and "X-Y." The XY connector is a panel-mounted receptacle, rather than a plug-end cable like you'd see in a game cabinet, but has the same pinout. You'd just need a straight-through male-to-male cable to connect it.

I guess someone could have plugged it into one of the auxiliary connectors on the side.
 
  • Ground trace is cut on either side of R12's connection to it. Ground is jumpered around so C4 is not isolated. R12's ground connects to R30, towards the center of the board.
  • R18 is joined to "BRN" and "WHT" pads on the end closest to the center of the board.
  • The R18 pad is jumpered to the negative terminal of filter cap C5.
  • Negative terminal of C5 is jumpered to "GRY" input wire.
  • "GRY" input is jumpered to "WHT/BRN" input.
  • "WHT/BRN" wire does not connect from P1 to the board.
  • The negative terminal of C5 is also jumpered to the positive terminal of C8.
  • The positive terminal of C8 is jumpered to R26, on the side closest to the center of the board.
  • The inner side of W22 is jumpered to J2, pin 1, which would be an RGB signal ground on a 19" or 25" deflection board.
  • The three "BLK" (RGB ground) pins of J2 are merged into a single pad.
  • The J2 ground pad is jumpered to P2, pin 2. (P2 is the connector for the cooling fan)

On the circuit side:

  • On R63, the end closest to the edge of the deflection board has a 5W 7KΩ resistor soldered to it; the other end is connected to the cathode (striped end) of diode CR2.
  • On C9, another 5W 7KΩ resistor jumpers from the side of C9 closest to the center of the board to the side of W26 closest to the center of the board.
 
Last edited:
This was resolved during the reproduction project

Komodo's original chassis had all of these mods too

I updated the diagram accordingly

http://www.dsbelec.iinet.net.au/Amp_Pat9000_Schem-01-color.jpg

Some wires just strengthen the tracks to allow more current

All of the wide blue tracks indicate there the wires go


On the RHS there are vias, joining upper layer to lower layer (GND)
 
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