Zenith version of k7000 series Wells-Gardner monitor

[Ken Layton]

Thought I would post this for everyone's reference and maybe it should go in the Monitor FAQ.

Around 1990 or so Wells-Gardner was getting so many orders from game manufacturers that they were falling behind in production. The k7000 was their most popular model at the time for arcade video games. So they subcontracted with Zenith Electronics for Zenith to build the k7000 MAIN circuit board and NECK board (but not the remote adjustment board). This became known as the "K7000A" chassis. It did not have the usual "P447" or "P538" numbers silkscreened on the circuit board like the genuine Wells-Gardners did. Instead the main board is silkscreened 204-2205-07 and the neckboard is silkscreened 204-2203-02.

The easiest way to identify this version is that there are TWO PINK wires going to the suction cup whereas the standard Wells-Gardner k7000 has ONE RED wire going to the suction cup. It is unfortunate that Zenith chose to partly redesign the circuit board from Wells-Gardner's design in order to use a propriatary Zenith made flyback. This particular flyback (Zenith numbers 95-4149 and A-15945) is no longer available anywhere thus making this chassis unrepairable should the flyback fail (a common problem). The flyback for standard Wells made k7000 (the 0528 flyback available from many suppliers) will not physically nor electrically work to repair the Zenith made chassis.

So if you have a k7000A chassis and the flyback is bad, then you're only hope to repair the monitor would be to either get a working regular k7000 Wells-made chassis (direct plug 'n play swap) or order an 8liners.com universal replacement chassis.

BTW, the k7000A uses the same capkits as the regular Wells-Gardner K7000 monitors. Zenith kept the same component designations (and values) on the pc boards at least.

Oh, and to further confuse people, Wells used (mostly) Zenith picture tubes in both versions.

[arcadepcnut]

Thanks for this informative post. I think I can just deal with the blooming on mine (I have the zenith model). My flyback is not 100% dead, just flaky.

[Witchboard]

Good to know.  This must have been prompted by the flyback request in the buy forum. 

[Ken Layton]

I have looked everywhere for that particular flyback. It's simply not available. Even replacement flyback manufacturer H.R. Diemen doesn't make a replacement. Perhaps if enough people contacted HR Diemen (www.hrdiemen.es/indexeng.shtml) and requested they make a replacement we could fix alot of these k7000A chassis. HR Diemen makes the best replacement flybacks out there. They never fail because their products are superior to the OEM originals.

[menace]

good info Ken--adding to FAQ as we speak!

[Grauwulf]

Ken, were these used primarily on 19" tubes or 25" tubes?
I ask only becasue I just pruchased one of these chassis from e-bay in unknown condition, along with a G07 chassis.

[Ken Layton]

I can't say for certain, but I believe the Zenith version was primarily (if not all) for the 25" models.

[Grauwulf]

Good, with any luck if it's working I finally have a chassis for my spare 25" monitor.

Thanks!