Re: black widow xy monitor problem

  The board set is not working I tested the x and y outputs and I get no
readings. The probe shows both X and Y low. The Z is high. Im not
familiar with these boards. The only vector board im familair with and
have repaired is the asteroids. This board is a gravitar converted to
Black Widow. All voltages to the board are what they should be. I probed
the mpu and the majority of the pins where low and about five were high.
There is no pulsing of data. There should be some shouldnt there be? Im
lacking information. I need to know what does what on this board so I
can figure out whats going on with it. I need to know what kind of
readings I should get from X,Y and Z. (I dont have a scope.) I also need
to know what readings the mpu should give me. ( I only have a DMM and a
Logic Probe)

If anyone knows where I can get some info on the web or has some to
share I would appreciate it,
Thanks,
Dan Piraino

Anthony Pietrak wrote:

>Dan,
>
>Not sure if you addressed this yet, but is the your Black Widow boardset
>known working?
>
>Assuming it is, I've found that most issues with these monitors are not
>componenents failing (assuming you recapped the board, and reflowed all of
>the solder joints on the pins). Many issues are usually a loose wire on a
>molex connector. I've also seen bad connections on the sockets of the
>deflection transistors, usually a wire will get weak at the solder joint and
>fall off.
>
>Probably sounds obvious, but I would just give a good tug and jiggle on all
>of your connectors while the monitor is on and see if something comes up.
>
>Anthony
>
>
>--Anthony Pietrak
>www.QuarterArcade.com
>Restored Arcade Games for your Home
>
>
>
>>-----Original Message-----
>>From: owner-vectorlist@vectorlist.org
>>[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Daniel Piraino
>>Sent: Sunday, July 31, 2005 8:44 PM
>>To: vectorlist@vectorlist.org
>>Subject: Re: VECTOR: black widow xy monitor problem
>>
>>
>> I replaced 100 uf cap on HV board. C902 I think.
>>I checked voltage coming off of pin 1 and pin 8 of the hv board. Im
>>getting +/-25 vdc instead of +/- 28 vdc. Is that enough? I
>>also checked
>>pin 5 of the same connector for 180v, but all I get is 171v. Is that
>>enough? I still have to check Q900 thru Q903. I checked the resistors
>>around those transistors and they check out ok. Spot killer is not on.
>>I also checked Q603 and Q703 on the deflection board and resistors
>>around those. Their all good. Like I said before I checked the
>>transistors on the chassis and they checked out ok.
>>But I unplugged the transistors from the deflection board to see what
>>would happen. I still get the same results with the transistors not
>>plugged in.
>> Now maybe Q605, Q606 and Q705, Q706 are not good, they checked out
>>alright though.
>>Any ideas,
>>Dan Piraino
>>
>>Daniel Piraino wrote:
>>
>>
>>
>>> I have been trying to get this monitor up and running. But
>>>
>>>
>>still have
>>
>>
>>>a problem with the picture only showing a dot in the middle of the
>>>screen. If I turn up the brightness on the HV, the dot gets
>>>
>>>
>>bigger. I
>>
>>
>>>can here some chatter. There is an lv2000 installed. Checked all
>>>transistors on chassis , checked out good. Checked HV board
>>>
>>>
>>replaced
>>
>>
>>>1.5k resistor that was burnt but it didnt fix the problem. After
>>>resistor was replaced I forgot to plug in ground on HV board from
>>>brightness& focus part of the HV transformer. It made aloud
>>>
>>>
>>squelling
>>
>>
>>>noise. It then stopped when I plugged it in. I saw some smoke but
>>>couldnt see anything burnt. Could I have hurt something else?
>>>Any ideas,
>>>Dan Piraino
>>>
>>>
>>>
>>>
>>--------------------------------------------------------------
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>>
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>>>
>>>
>>>
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>>
>>
>>
>
>
>
>
>
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>
>
>

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Received on Tue Aug 2 23:28:42 2005