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Hi there! ^_^  Is anybody here that has a digital scanned file or can scan the "Troubleshooting Guide" of Apple TechStep ?  At last i can do the PDF the User's Guide if needed to someone else here ^_^ thank you!  Michele

... that's sounds the conclusion i was waiting to get confirmed :) ...  was my thought it goes inside to a layer.. but yes the schematic get it nowhere and you are right. ^_^

Hi there,  A short question for who had experiences over it; Is there on the SE30 board an available point where can be hooked the pin 17 of the UE12 ? (the trace on the board is lost) The AM26LS30 schematic i get online give the ref. "SR-B"; it link to an internal PCB layer but i'm trying to...

Thank you techknight, i checked online this blue ring tester and i think to definitively go to get it  in parts to assembly.. :)

i get into the analog board today... having some time to work on by these holiday ;) . I received the flyback spare one week ago;  mounted it the result is been  .. PROBLEM SOLVED. So all stuff i mention above was linked to the dead Flyback that probably reach its honourable more then 30...

Yes bibilit, it seem to be the same/similar problem. I ordered the flyback as i realise to had no working spare ... i'll get it in the next weeks and i'll do a try; my doubt on T2 (01570039) remain and could be then needed to found a right replacement of it, i had no other analog board to get...

.. i go to get some look into the multiplexers and let here know the feedback, thank you technight for the suggestion.

... yes thats true... so i have to go to put it back, switch on and check the output voltages. Maybe its only my fear before switch on this logic board with another flyback... getting into it with the multimeter i was thinking that a certain resistance has to be present by the Coil itself.

Hi there,  I'm under a check/repair of an Analog board x a 512K; seems that the Flyback is gone and i already desoldered it, what appeared to me  was that the system got the bong, black screen,hot capacitors C1and C2 ( measured are steel good) and shorted to ground as a lot of  other components...

thank you techknight i try following your last thought but the SWIM chip its working fine in another working board and same for Hi and LOW ones; clean contacts and checked the continuity with the sockets too. This problem seems to be resident evil of another place. Al errors code tells me to go...

.. for now a first Understanding. I did some test with different RAM STICKS,  -12 (120ns) and -15 (150ns). I found finally theSticks that was the culprit of the error 00nn and 0003 (SIMM3) into this board. Changing position i get the relative mistake for the other position. To get the Stick...

uh, thank you for the reply... that sound as a conclusion of the understanding road :( .. .. but maybe i can try to check some of the other IC's like F257... the resistors, capacitors, transistor, burns and adb filter are all fine; i've not problem in soldering and socketing what ever is...

i use another couple of SIMM putting 2 sticks 256K in the row 2 ( SIMM 3 and 4) with the 2/4 jumper as is required for this SE mainboard;  but the ram are not the culprit i tested all in a working board, ... now with this step instead of the vertical BARS as above ( same setting) i get finally a...

Setting the jumper at 1Mb, i tried 4 sticks i have by 256K ... is the below images telling me there is a men sticks problem .. isn't it ? 

I add this info, in RP2 that i socket, checking continuity with the ground i get signal in pin 3 and 4, the bourn filter was not culprit as it give the same even with it changed. I get some picture measuring the opposite pins as curiosity with both new filter (MDP1603 471G) and past (115-0002...

uh.. i didn't get a look on that   :) .. but unfortunately this doesn't solve the problem; i tried 4 working 256K ram (M5M256J  -15) and i get the same result. (just to confirm your feedback, the ram present before where left chip M5M41000BJ -7 and right one  USA  U 9138 1024 M8; and yes...

Hi there,  I'm trying to let restart a board 820-0250A that won't start; regular chime and the video appear as normal but the arrow pointer and the floppy do not comes on. I red already the ref to RP2 Filter, i desoldered it; put a socket and tried with a substitution but the problem remain...

Hi there! :) I start this post to share my ongoing analysis to get an hardware solution x a not working mac 128/512k analog board. The problem that is evident with a white line up in the screen, comes as i did an error... unfortunately when i assembly back all, i forget the grounding cable...

------ So what I've concluded: (1) The Quadra can see that HDs are connected to the internal and external SCSI busses, but it treats the drives as unrecognizable and fails to mount them. (2) The CD-ROM drive behaves the same way. A known good external Apple CD300 drive acts the same - will...