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 (or
> raster) 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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Received on Mon Sep 22 14:19:12 2008
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