PRO-2004: 1 Column on Keypad Not working

[KC2GVX]

I have a strange one here, and am seeing if anyone else ever had this. I have a PRO 2004 modified for speed, 400 channels, and open 800 MHz. It has been sitting in storage for a while, and when I powered it up I noticed it doing weird stuff. It has reverted back to 300 channels, and the second column from the left does not work on the keypad. This is the column with Priority, Speed, Mode, Step, & Reset. All other keys work but this one. Anyone have any insight?

 

[pro92b]

The PRO-2004 had serious quality problems with its printed circuit boards, especially during 1987 production. There are copper traces on the top and bottom of the boards. In places where it is necessary to connect top and bottom traces together, a hole was drilled and then plated with copper to make the connection. This plating was faulty and over time it cracks, breaking connection from top to bottom. The symptoms can range from corrupted memory to the squelch not working. Sometimes the problem comes and goes or may be sensitive to temperature. The only way to permanently fix the problem is to put wires in all the holes and solder the connections on top and bottom. Pop the tops off the shields and repair the connections inside too. This takes a huge amount of time and for this reason repair shops like G&G consider the PRO-2004 to be unrepairable.

Another problem involves the glue GRE used on the large power supply capacitors to secure them to the main PC board. It's often black in color and you should see it around the base of the capacitors. There is a corrosive element in the glue and given enough time it eats through the copper on the PC board. The glue can be scraped off the board with a toothpick (don't use a metal tool) and you can then assess the amount of damage due to corrosion. Repair any broken traces with small lengths of wire.

 

[R1VINCE]

I had this problem with the 3rd row(limit,up,down,direct,monitor) about 2 years ago after i had done some mods. I ended up taking it apart again and double, triple checking all the old wire connection molds were connected, used a little contact cleaner, and had no "free play" when reconnected.
I didnt find the exact problem, but I never have had the problem again, even after taking it apart to do more mods.

 

[KC2GVX]

Thanks to you both so far, I am going to open her up tomorrow and follow each of your advice. I hope I can save it, I love the classics.

 

[KR4BD]

The 2004 was a great scanner. I still have the one I bought in 1989 and it works fine EXCEPT for the background light which died within the last year. It is still "use-able" but a real pain to use now.

 

[SQUAD109]

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You can give it to me if it's a pain to use now