Products > Vintage Computing
Commodore 1084s-P1 CRT repair
djos:
So I finally stopped procrastinating and started work on my Commodore 1084s-P1 CRT repair project. It should be fairly straight forward as the number 1 failure with these is the HOT going bang and taking the FlyBack transformer with it.
Required parts:
and this is as far as I got today before fatherly duties intervened:
At least it's fully discharged and im ready to start desoldering al the relevant components. :-+
djos:
Finished off the HOT & FlyBack Transformer replacement today - just need to replace the power switch now as it doesnt stay on.
Components gone:
New ones in:
putting the neck board back together:
half done - J1 wire hasn't been soldered in yet:
and mostly back together:
and she works!
Some adjustments will be required (pic is too bright) but i'll sort that after I replace the power switch in a few days (it's in transit).
SeanB:
Check all high value resistors ( anything over 10k) in the high voltage side, they do tend to drift high, and this causes the excessive brightness. Also resolder R3514, to make sure any hidden dry joint there does not kill the new parts.
djos:
--- Quote from: SeanB on September 30, 2017, 06:08:47 am ---Check all high value resistors ( anything over 10k) in the high voltage side, they do tend to drift high, and this causes the excessive brightness. Also resolder R3514, to make sure any hidden dry joint there does not kill the new parts.
--- End quote ---
I haven't adjusted the "screen" pot on the Flyback yet, out of the box it's usually set too high.
Thanks for the tip, I'll definitely check the resistors and the solder on R3514. Can you reliably measure resistance in circuit?
vk6zgo:
You are fixing a Monitor.
The big glass thing is the CRT
Calling the whole thing a "CRT" is an incredibly annoying species of "Computer person speak" which has no place in an electronics forum. >:(
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