Re: Vectorbeam monitor issues

I installed a 7406 and the intensity issue is fixed. I guess I mis-read
the part number... or I'm going crazy. I left the diodes in place.

This is where it's at now: the image is compressed into a band about three
inches tall. The vectors do not align.

Tail Gunner title
screen<https://lh6.googleusercontent.com/-QTu_tZiCu4Q/UVHJvPk0trI/AAAAAAAAKCE/H_rt2FjSdPU/s895/IMG_0008.JPG>
Push Start Credits
1<https://lh3.googleusercontent.com/-tFQ_GEJZJ6Q/UVHJv5uSUaI/AAAAAAAAKCM/wTEp0_cz9HI/s895/IMG_0009.JPG>

Any insights are appreciated.

Carlos

On Tue, Mar 26, 2013 at 10:40 AM, Carlos Rubio <csrubio@gmail.com> wrote:

> Correction to my original post: these<https://lh3.googleusercontent.com/-aQ9D82rvVr4/UVGOweZsPXI/AAAAAAAAKBk/E1w6AkFky-g/s895/IMG_0007.JPG>diodes are between pins 1 and 14 and 3 and 14.
>
> Carlos
>
>
> On Tue, Mar 26, 2013 at 10:28 AM, Carlos Rubio <csrubio@gmail.com> wrote:
>
>> One reason I hesitated on changing the 7409 to a 7406 is it looks like a
>> factory mod and I wasn't sure if other parts of the circuit had also been
>> modified to accommodate the 7409. The reason I think it's a factory mod is
>> because Bill Boucher's NIB Space War has a monitor identical to mine, and
>> his also has the mod as can be seen here<http://www.biltronix.com/images/space_war/2008_11_22/vsw_2008_11_22_05.jpg>.
>> I'm hoping someone here can help me understand this.
>>
>> I will swap it with a 7406, but should I leave the diodes in place?
>>
>> I forgot to mention in my original message that I verified the .5 amp
>> fuse in the power supply is good.
>>
>> I will check C10, thanks for the suggestion.
>>
>> Carlos
>>
>>
>> On Tue, Mar 26, 2013 at 10:06 AM, Rodger Boots <rlboots2@gmail.com>wrote:
>>
>>> 7409 is wrong part, change it to 7406.
>>>
>>>
>>>
>>> On Tue, Mar 26, 2013 at 7:14 AM, Carlos Rubio <csrubio@gmail.com> wrote:
>>>
>>>> Hello, I'm working on a Vectorbeam monitor on which I've replaced about
>>>> 90% of the components. This monitor is the "discrete" version with the HV
>>>> components on the monitor PCB. It also uses the older part numbers.
>>>>
>>>> Currently the screen is blank, but I'm not sure if it's a problem with
>>>> the intensity circuit or a legitimate spot killing. Jumpering Q2 (labled
>>>> Q24 on my board) causes the picture to appear and reveals that the top half
>>>> of the image is missing. All transistors have been replaced.
>>>>
>>>> I should also mention that this monitor has a 7409 at IC7 (labeled U6
>>>> on my board) instead of the 7406 referenced in every document and schematic
>>>> that I've seen. There are diodes between pins 1 and 8 and 3 and 8 as seen
>>>> here<https://lh3.googleusercontent.com/-aQ9D82rvVr4/UVGOweZsPXI/AAAAAAAAKBk/E1w6AkFky-g/s895/IMG_0007.JPG>.
>>>> I've replaced the 7409 and the diodes with new ones, exactly as they were.
>>>> The symptoms were the same before and after.
>>>>
>>>> I'd appreciate any insights in understanding if one problem is related
>>>> to the other, and how to narrow down the fault(s). Thanks,
>>>>
>>>> Carlos
>>>>
>>>
>>>
>>
>

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Received on Tue Mar 26 12:23:22 2013