[TechAssist] Re: Zener Diode ID
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 10 Jan 2005 19:18:37 -0500
I have access to the service manual and neither the parts list or the
schematic gives a voltage rating. I assume from the parts list that the
diode in question is D055 which is on the ACTION key scan line, if this
is correct then the purpose of the diode is to protect the
microprocessor from a static discharge. If all this is true a 33 volt
zener would not make much sense so I would say it is a 3.3 volt zener,
the operating voltage for the micro is 3.3 volts and some of the other
pins have 5.1 volt zeners to ground for protection. You can of course
simply remove this diode for test purposes to see if it is causing a
problem. Don't try this at home kids!
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
armando guerra wrote:
> Thanks for the reply jim. I had previously submitted help on this tv in which
> I did
> mention the model #.Here it is again. Panasonic CT-32C8G.
> I went to the tritronics website and checked but it does not list the rating
> on it.
>
> Thanks
> Mando
> Birdie's Tv & Electronics
> Casa Grande, AZ
>
> Jim Myers wrote:
>
>
>>If you would post a model and /or chassis number someone could probably
>>help. The generic number you have is more than likely a 33 volt or a 3.3
>>volt but I'd bet someone would know for sure with more information to
>>work with.
>>
>>********************************
>>Since 1972 *
>>Jim Myers *
>>Telrad Electronics *
>>Fort Wayne Indiana *
>>********************************
>>
>>armando guerra wrote:
>>
>>>I was given the oem part # for the diode from one of our members but I
>>>cannot find a cross for it so that I can see the voltage rating on it. I
>>>cannot find any info any where.
>>>Does anyone here know of a place that might be able to cross the diode?
>>>I have alot of zener diodes and I am pretty sure that I have one in
>>>stock but need to know what rating.
>>>The part # is MAZ40330MF. Thanks
>>>Mando
>>>Birdie's TV & Electronics
>>>Casa GRande, AZ
>>>
>>>
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