WG 6100 HV limit adjustment - Anyone know how to do this?

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WG 6100 HV limit adjustment - Anyone know how to do this?

This is my first 6100 monitor that I'm working on where there is a HV limit pot. R918 is a
simple adjustment in the cage to adjust HV to 181. How do you adjust the limit pot? Any procedures somewhere?
 
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I didn't know there was a 6100 with an HV limit pot. Where is that found on the ones that have it?

r918 if the HV pcb has it than it is under the cage and with the correct non-conductive tool can be adjusted without removal of the cage.
 
I didn't know there was a 6100 with an HV limit pot. Where is that found on the ones that have it?

K6100 FAQ explains it all. RECOMMENDED READING (now that you have that SD).

Only some have the limit POT.

"Here is how to identify the versions of the Wells-Gardner 6100 boards. The deflection boards are​
P314, P327 and P339. Some P314s were upgraded most of the way to P327s with a small piggyback​
PCB on wire "stilts" at the top of the PCB (see "Input Protection Circuit", described later in​
this document). The neck boards are P315 and P328 (P328 has a brightness adjustment in one​
corner) and the HV power supply boards are P316 and P329 (P329 has an LED, HV limit pot,​
and an extra electrolytic capacitor, C22, which is supposed to be 10uF at 63V). After much very​
disturbing feedback about the performance of the monitors, Atari had all the boards redesigned​
to be more robust. The P32X (and P339) versions are the newer versions of the boards."
 
There are two versions of the HV cage. P316, and P329. The earlier ones (P316) don't have the HV overvoltage trip circuit, and the later ones do (and have a second pot on the front edge of the board).

Honestly, I believe the circuit was added by Atari for political reasons, more than technical ones, as there was a specific point where they added RF cages, filter boards, and other mitigating elements to the designs, as well as the documentation (as there are specific revs of the docs where you can see that the main changes were the addition of the FCC notices. Millipede is one of them).

I suspect they got spanked by the FCC for playing fast and loose with the regulations, and rather than paying a fine, agreed to add stuff to 'address' radiation issues. That's just my theory, but the circuit on the HV board is fairly simple, and a bit of an afterthought IMO. You aren't missing out on anything if you have the older version (and I prefer them, myself), as the chances of one putting out x-rays is small, if it's rebuilt and adjusted properly.
 
I've never seen that variation of the HV board. Now I need to look for a picture of it.

K6100 FAQ explains it all. RECOMMENDED READING (now that you have that SD).

Only some have the limit POT.

"Here is how to identify the versions of the Wells-Gardner 6100 boards. The deflection boards are​
P314, P327 and P339. Some P314s were upgraded most of the way to P327s with a small piggyback​
PCB on wire "stilts" at the top of the PCB (see "Input Protection Circuit", described later in​
this document). The neck boards are P315 and P328 (P328 has a brightness adjustment in one​
corner) and the HV power supply boards are P316 and P329 (P329 has an LED, HV limit pot,​
and an extra electrolytic capacitor, C22, which is supposed to be 10uF at 63V). After much very​
disturbing feedback about the performance of the monitors, Atari had all the boards redesigned​
to be more robust. The P32X (and P339) versions are the newer versions of the boards."
 
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