Re: G05 HV troubles

  I had a few in a drawer, just to be sure, i tried 3 other diodes and i
get the same with each one, R901 still burns up.. :(

any other ideas?

Andrew Welburn
http://www.andys-arcade.com

On 23/08/2013 17:09, John Robertson wrote:
> On 08/23/2013 5:16 AM, Jeffrey Matthews wrote:
>> Andrew;
>> Did you check/replace D904 leading to the anode cup?
>> I had a R901 cooking and found that to be the culprit.
>> Jeff
>>
> Indeed, the HV diode can cause all sorts of overheating problems. I see
> that they are still being made by a few people and available from a
> couple of suppliers:
>
> http://hvstuff.com/high-voltage-diodes-and-rectifiers
>
> And:
>
> http://www.americanmicrosemi.com/products/search/index.php
>
> Look for the 2CL73, 2CL74 and 2CL75
>
> John :-#)#
>>
>>
>>
>> On 8/23/2013 4:56 AM, Andrew Welburn wrote:
>>> hi all..
>>>
>>> I've been fighting with a HV box from hell recently, and i've held
>>> off posting to vectorlist until i was really stuck. I'm at that point
>>> now.
>>>
>>> Its a G05-802...
>>>
>>> Right now, R901 is smoking up. I'm only getting 7.2kv at the anode,
>>> and the HV adjust pot does not change the hv. I can only have it
>>> running for 10 seconds before R901 really starts to cook off.
>>>
>>> The flyback was actually bad, as the HV was bouncing around from
>>> nothing up to 7kv very erratically before, so i swapped that from a
>>> known-good v2000 hv box. Now i get a steady HV, albeit low and r901
>>> still burning up. (R901 was cooked crispy before the flyback swap
>>> anyway)
>>>
>>> I have subsequently swapped _every_ diode and transistors in the
>>> box, and it still acts the same, no improvements. I also changed the
>>> electrolytics, and the HV adjust pot itself (R905).
>>>
>>> Can anyone think of a scenario that would let R901 burn up? any
>>> pointers as to where i should be looking harder?
>>>
>>> thanks..
>>>
>>
>> ---------------------------------------------------------------------------
>>
>> ** Unsubscribe, subscribe, or view the archives at
>> http://www.vectorlist.org
>> ** Please direct other questions, comments, or problems to
>> chris@westnet.com
>>
>
>
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Fri Aug 23 13:01:48 2013