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Author Topic: Sanwa v21 pm1723c - shakey image (SOLVED)  (Read 531 times)

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perjmolsen

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Sanwa v21 pm1723c - shakey image (SOLVED)
« on: January 03, 2020, 02:10:35 pm »
Hi

I have tried to repair this old Sanwa v21 pm1723c chassis.

I have changed all the electrolytic caps on the chassis to new one with the same value as the old one.
Only one cap i did not have in my parts boxes, main PSU cap where an 680uf 200V I put in a 470uf 200V.

It is now working, but I am unable to figure out why my image is shaking a bit.
See mu video here:


I have tried to find some schematic on the chassis, but no luck.
Does any know what can cause an image to shake?

I have not messured the B+, because I do not know what it is need to be.

--
Cap list
Location   Org. Value   mounted
c810   680uf 200v   470uf 200v
c328   220uf 63v   220uf 50v
c327   220uf 63v   220uf 50v
c303   47uf 16v   47uf 25v
c320   47 16v   47uf 25v
c311   1uf 50v   
c301   3.3 50v   
c335   10uf 50v   
r306   10K ohms   
c318   10uf 50v   
c312   1 uf 50v   
c313   220uf 16v   
c329   33uf 16v   33uf 25v
c309   1uf 50v   
c103   10uf 50v   
c102   33uf25v   
c107   10uf 50v   
c101   10uf 50v   
c321   1uf 50v   
c407   100uf 200v   
c104   1000uf 25v   
c319   10uf 50v   
c322   4.7uf 180v   
c406   33uf 160v   33uf 200v
c802   22uf 160v   
c402   220uf 25v   
« Last Edit: January 08, 2020, 08:52:28 am by perjmolsen »

perjmolsen

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Re: Sanwa v21 pm1723c - shakey image
« Reply #1 on: January 03, 2020, 04:47:11 pm »
Well suddenly I got this .. I just turned the monitor on, nothing changed.... :dizzy: :hissy:

I guess that is called vertical collapse...
« Last Edit: January 04, 2020, 04:32:20 am by perjmolsen »

perjmolsen

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Re: Sanwa v21 pm1723c - shakey image
« Reply #2 on: January 03, 2020, 06:09:05 pm »
Trying to figure out why I suddenly got vertical collapse

I have checked all the polyester caps, they all check OK.

Also tested the big ceramic resistors, they are also all OK

Then i tried to see what my B+ is.. If I am testing it correct, then it is only 44.8V
I am testing with + on the middle leg at the D1555, I guess that transistor is the "HOT" and normal the B+ can be measured at the middle leg...

Can my issue now be that the only cap that I did not replace with the same as original..
one Cap in the PSU where org an 680uf 200V - I put in a 470uf 200V...

But the chassis had worked...  :dizzy:
« Last Edit: January 04, 2020, 04:32:51 am by perjmolsen »

princess prin prin

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Re: Sanwa v21 pm1723c - shakey image
« Reply #3 on: January 04, 2020, 05:25:21 am »
That's horizontal collapse. Check the connections of the horizontal yoke. One side is coupled to the HOT collector, the other to the horizontal size and linearity coils.

perjmolsen

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Re: Sanwa v21 pm1723c - shakey image
« Reply #4 on: January 04, 2020, 08:09:00 am »
Hi

You where right!!!  :notworthy:

I had a bad yoke connector at the PCB!
I have put some jumper across, and now i do not longer have the line "|" fromtop to bottom, but a nice picture and no more shaking! (when the connector is in the A)


BUT if i put the connector in the "B" i have a line "-" on the screen, but that is no issue, I just use the A connector... but strange

princess prin prin

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Re: Sanwa v21 pm1723c - shakey image
« Reply #5 on: January 04, 2020, 08:46:35 am »
Soldering isn't good. You have vertical collapse on the other header for the same reason, bad soldering on  the vertical yoke pins. Try making it better overall. Bad soldering can lead to burned connectors/wires eventually.