Re: Tempest Schematic error?

Yeah I'm to the prom, trying to figure out why OP0-2 aren't making it to it.

P7 shows OP0-1 and they are toggling. Trying to find the origin of OP2, then
try to figure out why they aren't making it to the Prom.

I've already tried swapping the prom with known good.

On Sat, Jun 26, 2010 at 11:55 PM, Rodger Boots <rlboots2@gmail.com> wrote:

> NO NO NO, don't tie the others high---find out why LATCH1 (inverted) is
> staying low.
>
>
> On Sat, Jun 26, 2010 at 11:51 PM, Kevin Moore <talon.k@gmail.com> wrote:
>
>> I haven't tried tying the others high. But no they don't pulse.
>>
>> I've been trying to track down the VGCK, but so far I haven't been able to
>> find the origin. Guess my eyes are getting tired from looking at these
>> schematics.
>>
>> It's looking like the VSM is dead, and it may be due to the VGCK.
>>
>>
>>
>> On Sat, Jun 26, 2010 at 11:21 PM, Rodger Boots <rlboots2@gmail.com>wrote:
>>
>>> I was only getting DVY8-11.
>>> So you're saying ONLY F5 is working? I could believe that...
>>>
>>> Having pin 1 tied high might not be that important. A better question is
>>> why pin 1 on the other chips is low---do they pulse at all???
>>>
>>>
>>>
>>> On Sat, Jun 26, 2010 at 9:32 PM, Kevin Moore <talon.k@gmail.com> wrote:
>>>
>>>> Versions 1, 2, 3 all show the same thing. Looks like a cut and paste.
>>>> Pin 1 definitely get's hooked to pin 2 solder pad joining them. I would have
>>>> never noticed, but I have a video problem, and I was only getting DVY8-11.
>>>> When I started probing I noticed that pin 1 was high on F5, but not on any
>>>> of the other Ls194 chips. So that got me off on a wild goose chase trying to
>>>> figure out why pin 1 of the rest of the circuit wasn't connected to F5 pin
>>>> 1.
>>>>
>>>> In any case, none of my latches are toggling, nor any of the states
>>>> going into f7.
>>>>
>>>> So now I'm doing the logic probe shuffle in circles.
>>>>
>>>>
>>>> On Sat, Jun 26, 2010 at 9:18 PM, Kevin Moore <talon.k@gmail.com> wrote:
>>>>
>>>>> Yeah it's an ls194 alright. But the board/s I am looking at all have
>>>>> pins 1 and 2 shorted.
>>>>>
>>>>>
>>>>>
>>>>> On Sat, Jun 26, 2010 at 8:52 PM, Rodger Boots <rlboots2@gmail.com>wrote:
>>>>>
>>>>>> Printing 1 schematics show same thing, no pin 1-2 connection and chip
>>>>>> is an LS194.
>>>>>>
>>>>>>
>>>>>> On Sat, Jun 26, 2010 at 8:48 PM, Rodger Boots <rlboots2@gmail.com>wrote:
>>>>>>
>>>>>>> The schematics I pulled up say F5 is an LS194 with pin one being
>>>>>>> LATCH1 (inverted) and pin 2 going to P R15. But there is a connection dot
>>>>>>> at pin 1 and I am using printing 2 of the schematic, so on printing 1 they
>>>>>>> MIGHT have been incorrectly connected together.
>>>>>>>
>>>>>>>
>>>>>>> On Sat, Jun 26, 2010 at 6:33 PM, Kevin Moore <talon.k@gmail.com>wrote:
>>>>>>>
>>>>>>>> So I was looking through the schematics today, and it seems that
>>>>>>>> there is a problem in the vector-generator data shifter
>>>>>>>> section. Specifically with F5. Perhaps I'm just confused, so I thought I
>>>>>>>> would ask and see. But it looks to me like pins 1&2 are tied together.
>>>>>>>> Instead of having /Latch1 going into pin 1.
>>>>>>>>
>>>>>>>> Also could someone explain to me what the P,R15, and P,R31 lines
>>>>>>>> are?
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>>
>>>>>>>> Kevin
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>

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Received on Sun Jun 27 01:10:52 2010