Berzerk Help!

TK1072

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I need some help from the Berzerk experts out there!!

Well, I went to turn on my Berzerk tonight and after beeping twice (during the start-up self-tests) it was completely silent. The screen just showed a bunch of scrambled garbage. According to the manual it states:

1. Check RAM CHIPS 1E and 2E
2. Check transistor Q2 and associated components/circuits
3. Defect in gating chips 2A, 3A and 6A
4. Check the jumper used for chip 1E in correct

Has this happened to anyone else? If so, what would you recommend?

For #4, the correct jumper is being used (W5). For #2, the transistor appears alright but....sometime in the past someone attempted to add a homemade battery backup for the highscore save and it looks like a sloppy job. Doesn't look like it is but could this be the cause?

If it's the chips as described in #1 & #3 then I'm in trouble; I have no knowledge about these components. How can I check the RAM chips in 1E & 2E? Or how can I check the gating chips?

Any help would be appreciated and thank's in advance!!
Take care,
-Dave
 
Thanks for the advice HudsonArcade!!

This would be the area on & around the reset button on the ZPU, correct?

I removed the battery holder that had been placed where the original battery back-up had been and also removed the top blue button-part of the reset. Looked all around visually. I don't really have hardly any corrosion on the board at all; the only area was where the + contact was for the original battery. Cleaned that area with a 50/50 mix of white vin and water. No sign of corrosion any where else on the board.

Reset the chips at 1E & 2E. No results.

I'm thinking this is way above me. Does anyone know anyone who can repair these boards?

Thanks!
 
I have a ZPU with rather light acid damage, and the long rows of resistors and diodes are affected.

Is there a parts list online that details what I'd need or possible upgrades in the reset section of the PCB? Thanks..and hopefully this helps the OP
 
If you have a logic probe grab pin 26 on the Z80....see if it toggles from low to high when you push the reset button on the ZPU. If it does...your reset line might be just fine...
 
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