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Old 12th Mar 2017, 1:20 am   #1
bionicmerlin
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Join Date: May 2010
Location: Warminster, Wiltshire, UK.
Posts: 682
Default BAIRD M628 series 620

Can anyone give me some help please.
I thought i would get on with the next set as part of my self learning.
I got this set up and running after a valve and a few components replaced.
The set has been working for about a week with a reasonable picture apart from poor hight and linearity .The controls are at max and in the past someone added extra resistors infact making the problem worse .I have now removed them. I cant find any out of spec components in these areas.
Next problem is after about a week the contrast has gone very poor .I tested the pot and resistors in this area but all ok.
One other thing is when the set is switched on often but not always it takes longer than it should to show a picture with a fast clucking noise possibly from the line output transformer.I have tried the set in the dark and cant see anything breaking down.
The set has been stored in the dry indoors for about a year.
Thanks Andy
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