Re: TECH: Battlezone G05-805 monitor - still having problems

Commander Dave wrote:

> Hi all,
>
> I finally got back out to the workshop and did some measurements on
> the monitor while the game was running. Roughly, all the voltages are
> a little low. Here is the rundown:
>
>
> 40 VDC (measured at F102) ~ 33 VDC (this goes to the EHT)
> 30 VAC measured at F100 & F101 ~ 27.6 VAC Each (this is input
> from the harness to the monitor)
> 34 VDC for the B+ measured at Pin 1 on connector P600 and P700: ~32 VDC
>

You might want to check that the power supply chassis has the correct
voltage select plug inserted for the voltage you have at the wall outlet.

> And the big find of the day is that
>
> 90 VDC measured at Pin 1 on P500 starts at close to 90 VDC, but then
> after about 15 minutes of warm-up, has dropped to around 70 VDC!
> The high voltage measured at the anode starts out at about 12 KV
> (about normal), but after the warm-up, is down to about 9.3 KV.
> At this time, the monitor has went into full bloom. None of the other
> voltage drop.
>
> Another thing I found is that my schematic for the HV cage PCB is not
> correct in the monitor manual. The HV PCB layout says P900 PCB in the
> manual, but the actual HV PCB says P300. Anyone got the correct
> schematic? Things just don't match up between the two...
>

I found a P300 HV supply schematic, but it's in the Wells Gardner
19V2000 manual!

> Still looking for the problem, but at least I am on the trail again.
> Comments?
>
>
> RODGER: Sorry for the misspelling my friend - from your response you
> must get a good bit of that. :-) Thanks for the help.
>
> Regards,
> -Commander Dave
>
>
> ----- Original Message -----
>
> From: Rodger Boots <mailto:rlboots@cedar-rapids.net>
> To: vectorlist@synthcom.com <mailto:vectorlist@synthcom.com>
> Sent: Wednesday, October 09, 2002 02:46 AM
> Subject: Re: VECTOR: TECH: Battlezone G05-805 monitor - still
> having problems
>
> Commander Dave wrote:
>
>> ALL: Thanks for the tips. I will be getting back to testing later
>> this week.
>>
>> Roger: Can you tell me how to test this diode (ZD901)? Will it
>> test with a meter on the diode setting? What should I look for?
>
>
> It's Rodger, damn it!
>
> The only real way to test it is to measure the voltage across it
> (56 volts) with the power supply running.
> If you don't trust yourself doing this get some clip leads ('Shack
> has them) so the meter can be connected without you holding the leads.
>
>>
>> Peter: I'll check the voltages coming into the monitor and see if
>> it changes after warm-up. I guess that I should have checked all
>> the other voltages to see if they drop as well. Thanks.
>>
>> John: Those small caps you mentioned... what style are they? If
>> they are the can style electrolytics, then I believe all were
>> replaced.. but I will double check. If they are not the radial
>> type, let me know.
>>
>> Again, thanks to all.
>>
>> -Commander Dave
>>
>> ----- Original Message -----
>> From: Rodger Boots <mailto:rlboots@cedar-rapids.net>
>> To: vectorlist@synthcom.com <mailto:vectorlist@synthcom.com>
>> Sent: Sunday, October 06, 2002 16:20 PM
>> Subject: Re: VECTOR: TECH: Battlezone G05-805 monitor - still
>> having problems
>>
>> My best guess, ZD901, the 56 volt zener.
>>
>>
>> Commander Dave wrote:
>>
>>> Hello all,
>>>
>>> Yes, these are the postings that never end. I am getting so
>>> disgusted with this G05-805. I was able to get a working HV
>>> diode and the problem of shaking and blooming still shows
>>> up. When powered up totally cold, the HV is fine, maybe even
>>> a little over. The image on the monitor,however, has a very
>>> small case of the shakes and as it warms up the HV (about 5
>>> minutes or less), the image starts to expand and the HV
>>> starts to drop. It was down to 10.8 KV when I got disgusted,
>>> cut the power and left.
>>> <<snip>>
>>
>
>

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Received on Wed Oct 9 12:04:07 2002