|
Hey Members,
thought i would update on the virtual(skype videophone) service call.
1st of all-Great work Mips!
i found giving tech advice is So much easier/better skypeing than typing-lol! the future perhaps?
problem #1- two waveforms not correct- scope was set to roughly vert freq-when switched to horz freq-waveforms were correct.Mips found this out before the call.
problem#2-too much width-from what i could see, width was close enough-after all, vintage sets are not that accurate-most look fine with designed tolerances at 20%. And i have found over the years that a lot of sets that vintage had very little affect adjusting the width.
problem #3-ac leak to chassis.-leaky ac jack-never seen this one but Mips found the problem before the call.
problem #4-radio dial out a bit- readjust pointer on dial cord to match station frequency being recieved.ussally an easy fix versus an alignment.
problem#4-vertical rolls when adjusting vert height for best picture-height looked good enough to me during the call and vert hold was in the middle of the pot but in hindsite-i should have mentioned that you sometimes have to readjust vert hold while changing vert height/lin-maybe Mips already knew this.
problem #5-knob missing-suggested that Mips post a picture of it on here and arfs classified section.
problem#6-picture is slightly darker near top of crt-thought it might be a neck shadow but didnt quite look that way to me. Mips mentioned that the tv had uneven sunlight casted on it for a long time so perhaps phosphors could have been affected?
in hindsite,i thought that if this is so,you should be able to see a slight difference in the color of the crt phosphor with the set off?
it reminded me of a set i fixed years ago where the set was played for a long time with too little height. by the time i got it, the phosphor was brighter where the scan had missed -looked at 1st glance that there was slight vert"foldover". you could see the different color of the phosphor with the set off!
problem#7-while vert height was being adjusted, a pf range disc cap blew in the horz section-i thought it was just a coincidence-never heard of a cap blowing in horz while adjusting vert section. most likely a original disc cap ready to blow(across the horz yoke iirc)
Problem#7-at one extreme adjusting vert hieght, the scan almost collapses down to aprox 1 inch. but i could see that the vert osc and amp were still working-not a complette collapse-my thoughts are that perhaps with this early desigh, that this is normal. the set can be adjusted for acceptable picture. Mips has replaced most caps(except some ceramics/discs)/checked most resistors.
Question#8 Mips showed me some tubluar ceramic caps and wondered if he should change them-iirc, they are ussally good---Mips-could you repost a picture of those caps?
any thoughts from the forum?
RonL
|