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 10:40:53 2013
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