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(English) Aritma 0516 dc motor https://oldcomp.cz/viewtopic.php?f=144&t=10045 |
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Autor: | dat-alex [ 17.05.2021, 12:42 ] |
Předmět příspěvku: | (English) Aritma 0516 dc motor |
Hi! to all out there... I came this form in order to gather more infos on my own Aritma 0516 plotter. It was working for years but suddenly I dig it out to run a test on it with my retro computer but I have the following problem: It initializes ok on moving the head far left. It plots ok but when I try to park or pick a pen the moving pens holder bar moves forward to change/park pen and is stuck in the engaged position. If i open the printer and rotate the DC motor shaft (located far left) a little bit with my finger the mechanism is working (although very very slow ) to the initial position until next time it is stuck again. I guess maybe is a problem with DC motor, dc voltage range, reverse problem , driver problem etc , I examined your schematic found from a link here but I cannot find the section refers to this motor. Any suggestions? Thank you for your excellent forum infos and your time Alex GR Sorry for my English but I dont know your language |
Autor: | RaceSoft [ 17.05.2021, 13:27 ] |
Předmět příspěvku: | Re: (English) Aritma 0516 dc motor |
Hello, circuit is on sheet 516-20511--4 L.2 (5), in bottom part. P. |
Autor: | dat-alex [ 17.05.2021, 16:04 ] |
Předmět příspěvku: | Re: (English) Aritma 0516 dc motor |
Thank you my friend.... I will proceed with repair now |
Autor: | Czech Human [ 17.05.2021, 20:00 ] |
Předmět příspěvku: | Re: (English) Aritma 0516 dc motor |
If you are happy, we are happy . It is nice to see Aritma 0516 is still used nowadays even just for fun outside former Czechoslovakia. GR is for Ελληνική Δημοκρατία? |
Autor: | dat-alex [ 18.05.2021, 10:50 ] |
Předmět příspěvku: | Re: (English) Aritma 0516 dc motor |
Yes I used Aritma connected on my (retro) Commodore 64! in a retro event party in my city (as a member of rectroclub.gr) https://www.youtube.com/watch?v=oQPBUttDcHo |
Autor: | dat-alex [ 20.05.2021, 10:09 ] |
Předmět příspěvku: | Re: (English) Aritma 0516 dc motor |
Well SUCCESS with the repair. In the following foto you can see the motor that was stuck in one direction/and turned slowly on other direction while pen exchange. Příloha: I measured the voltage across motor pole and I read 5V (??!) weird reading as according to schematic motor should get 28V! Příloha: So I understand that there should be driver problems so I checked PCB (red circle) Příloha: I measured BD710 & BD709 and also the 4 diodes but I could not see any problem. Suddenly I noticed that a resistor long wire was shorting with output of a BD transistor (!?) .Violla! that was the problem:the triger voltage (at the base of BD ) was passing at the output stage directrly providing the output with incorrect 5v instead of the correct 28V (!!!) |
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