Peri Noid Posted November 29, 2021 Share Posted November 29, 2021 I have a question regarding an 825 printer. I managed to buy one. Unfortunately, it seems, there's something wrong with it - after powering on, it starts to feed the paper constantly. At first I had a though, that maybe it needed to be connected to the computer. So I got a cable to connect it with an 850 interface, which I had earlier. Seems I have the full set required for it to work. But it didn't help. I checked the paper feed switch - it's OK. Do you have any suggestions, what can be the cause? Maybe there exists a repair manual? These printers seem rare here in Poland and therefore it may be impossible to find people familiar with service of such printers. Thanks. Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted November 29, 2021 Share Posted November 29, 2021 (edited) what do you have for mains power? did It get fried? did you load the paper and is the paper retention down in place? here's the manual https://ia601007.us.archive.org/20/items/Atari825PrinterOperatorsManual/Atari 825 Printer Operators manual_text.pdf pages 6-11 some notes then operation follows. pay close attention the the paper reverse/forward switch and that it is not stuck, or have anything lodged in it... check it's spring. Edited November 29, 2021 by _The Doctor__ 1 Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted November 29, 2021 Author Share Posted November 29, 2021 Thank you for your answer. The printer needs an American voltage so I must use the voltage converter - but it works as it should. Unfortunately, I have completly no idea about the history of this printer - yet I expect, it never met our European 220/230 voltage since it still has its original power plug. I tried loading the paper but it changes nothing. When powered up (with or without the paper), the printer rotates the roller for a fraction of a second, then stops for ~1s and then starts rotating again forever. If I move the head manually to the right, it returns to the left when I turn the power on. Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted November 29, 2021 Share Posted November 29, 2021 (edited) did you check the forward reverse button as suggested? it may be stuck or the spring and contact at issue... Edited November 29, 2021 by _The Doctor__ Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted November 29, 2021 Author Share Posted November 29, 2021 Yes, I did. It's fine - I mentioned it in the first post. Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted November 29, 2021 Share Posted November 29, 2021 when you say it is ok, that means it's in the open position at rest? Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted November 29, 2021 Author Share Posted November 29, 2021 Yes, it is. Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted November 30, 2021 Share Posted November 30, 2021 A quick Google and I think the printer mechanism is a Centronics 737 printer, but again only the owners manual, can't seem to find a service manual for it either Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted November 30, 2021 Author Share Posted November 30, 2021 Yep. I already have this manual. But nothing useful there. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted December 1, 2021 Share Posted December 1, 2021 And it behaves like this, even when not connected to the 850? Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted December 1, 2021 Author Share Posted December 1, 2021 Yep. Connected or not - doesn't matter. Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted December 1, 2021 Share Posted December 1, 2021 check the nearest power control component is series from the motor, is the transistor ok, the low power control that silicon switch Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted December 2, 2021 Author Share Posted December 2, 2021 Is there a schematics somewhere? It would be easier with it. Quote Link to comment Share on other sites More sharing options...
BillC Posted December 2, 2021 Share Posted December 2, 2021 14 hours ago, Peri Noid said: Is there a schematics somewhere? It would be easier with it. There is a ZIP file for the 825 at the following webpage, be aware that these schematics usually contain some errors. http://jsobola.atari8.info/dereatari/schematy.htm Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted December 2, 2021 Share Posted December 2, 2021 Yup and it looks like C9 ME6 (SAA1027) ME7 ab ME15 B C8 ME10 ab (74ls74) ME3 (8042) ME2 ME13 (UA7392) and some transistors. the passives (resistors) normally are visually borked if they're bad... 1 Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted December 3, 2021 Author Share Posted December 3, 2021 On 12/2/2021 at 10:18 PM, BillC said: There is a ZIP file for the 825 at the following webpage, be aware that these schematics usually contain some errors. http://jsobola.atari8.info/dereatari/schematy.htm Damn, I forgot about Jer's page! Thanks! Quote Link to comment Share on other sites More sharing options...
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