Yes, I think you are correct...have edited my advice - missed that!
John :-#)#
Craig Walker wrote:
>
> Be careful, you will cause damage on some raster monitors running them
> without the yoke plugged in!
>
> Cheers,
> Craig
>
>> As you found out the yoke was not your problem. You CAN run XY
>> (xxxxxx) monitors with the yoke unplugged as a test. However NEVER
>> attempt to run these monitors with any transistors unplugged -
>> particularly the output transistors! That can or will destroy other
>> transistors or resistors.
>>
>> Have you resoldered ALL the Molex pins on the board that everything
>> plugs into? Very common for one or more pins to have a cracked solder
>> trace so it is intermittent.
>>
>> John :-#)#
>>> I'm reasonably certain that the chassis transistors are ok, as I
>>> swapped the plugs round, to swap the pairs for the regulator and one
>>> of the deflection pairs.
>>>
>>> As a further note... Q100 and Q101 had been replaced with standard
>>> 7824 / 7924 voltage regulators, they look like they have just been
>>> dropped in with no further modifications to the circuit... surely
>>> this is not good practice ?? I thought this might be the problem,
>>> soI dropped in some transistors to replace - a mpsa06 and an BD238
>>> with the legs swapped over (not got a mpsa56 to hand).
>>>
>>> I'll get these, just need a little more time to investigate.
>>>
>>> Cheers, Colin
>>>
>>>
>>> I plugged in the monitor for the first time ( this was aquired a
>>> few months ago and it had a known fault) and getting a display...
>>> BUT something is breaking down in the chassis, and its sucking
>>> some of the vectors up into the middle of the screen !! (Looks
>>> fine on the XY scope !!)
>>> I'm thinking I have a HV board fault... I can hear what sounds
>>> like HV tracking (not the deflection chatter) - I took this
>>> picture....
>>>
>>> http://www.jammaplus.co.uk/forum/uploads/ColinD/2008-09-20_203630_tp4.jpg
>>>
>>> I cant leave it on for long as the phosphor will burn... I
>>> think
>>> I'll try another HV unit... and if not.. start trouble shooting
>>> the deflection with the brighness turned down too when testing !!
>>> Any ideas please ?
>>
>>
>> --
>> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
>> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
>> www.flippers.com "Old pinballers never die, they
>> just flip out"
>>
>
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--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com
"Old pinballers never die, they just flip out"
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Received on Mon Sep 22 14:26:39 2008
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