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Since you have terminator power, all those parts, which are located near F3 on top and on the bottom of the PCB, are all likely good (L=ferrite choke inductor, D=SMT diode). To be sure, disconnect any internal hard drive and measure again, that voltage should still be there. Had that voltage...

UI6 produces the missing signal, and also the main clock to the 68030. Either it is faulty, or missing an input signal, or the output is shorted (possibly by corrosion, but it is far from the capacitors). A scope or even better a logic analyzer would tell the story. The solder pads being dull...

Measure the voltage on pin 25 relative to the ground shell of the SCSI DB-25 on the lower rear back center. Expect about +4.2V. If not check L10 L9 L8 D3 F3, they are on the DC path to power the SCSI controller chip UI12 and SCSI terminator power you just measured. If fuse F3 is blown...

Make sure no capacitor goo leakage from C7, C8, C9, C10 has spread and caused corrosion or shorts. If 20 pin PAL UI6 is socketed, note its direction, carefully remove it, and inspect all pins and socket metal for corrosion under magnification. Especially pin 18. Clean as required. Carefully...

MacVision serial adaptor is powered by a 9VAC (300 mA rating) power cube and produces +5 and +12 VDC for the digitizer (measured 5.01V and 12.14V with no load). DB9 1 GND 2 +5VDC 3 GND 6 +12VDC The adaptor also connects four signals (no DC power!) between Mac and MacVision: Signal...

Right, I missed that. Furthermore, in Dead Mac Scrolls, page 147, he goes further than the 1990 book and says the MR824 is the preferred heavy duty replacement part if a GI854 part is failed shorted. I looked briefly at the datasheets and the 824 is definitely beefier, similar in reverse...

Don't have that exact board for reference, and Pina says the reference designators do change between Mac US, Mac International, and SE|SE/30 versions. So perhaps you will have to do some reverse engineering to figure out your analogous designators. On the SE analog board Pina says change CR2...

According to Larry Pina (1990) Appendix C/D/E pages 333, 340, 344, the 157-0042B will replace all of the earlier models including the -0026, for the Macintosh Analog Board US Version, International Version, and on the Macintosh SE Analog Board (used on SE and SE/30). Pina's subsequent 1993...

There are so many ways things can go wrong it makes your head hurt to think about it. I see Motorola used on my reference SE/30 analog board for the Bu406 horizontal switch application. So that vendor is likely a safe initial order choice. But I think testing to see if the raster has any...

Indeed. In my 1992 catalog the Personal Laserwriter NTR was $1989, specs at http://support.apple.com/kb/SP438 Adding a Farallon EtherMac iPrint Adapter PN559 puts it on the Ethernet. Compare with the QuickDraw Personal Laserwriter LS at $1079. http://support.apple.com/kb/SP440 The Personal...

The simasimac page at http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html has a nice chart of various flyback numbers and which have the bleeder. It appears that 157-0042 had the bleeder in all ABC versions. The numbers appear to be from Larry Pina Macintosh Repair and Upgrade Secrets 1990...

Yes indeed. For example, MCM used to stock the one for the Mac, but best I can tell no longer.

http://www.dalbani.com/ They currently have a 157-0042B flyback in stock. They also show a C version but currently out of stock.

Just a guess...if you have that "Bottom Options Jumper Block for SMP Versions", try three jumpers to disable TI Sync Negotiations, disable SCSI parity, and disable Unit Attentions.

Guessing from the Type 0662 number, http://www.4drives.com/DRIVESPECS/IBM/1442.txt

Me too, you would think if something might break, the last thing you would want to do is put and leave any kind of additional unnecessary forces on it. But prestressed concrete is a somewhat similar kind of invention where internal cables compress a beam lengthwise. This is so that the beam...

Yep. Proper replacements come with the permanently attached implosion control band with mounting lugs.

The metal band around the CRT is more than a means to secure the four corner mounting lugs. It is an implosion resisting band applied and tensioned by the CRT manufacturer to many hundreds of pounds of tension. It applies an inwards force especially at the four outer corners of the glass where...

Digi-Key lists Fairchild BU406FS-ND TO-220 pkg at 68 cents. Going with an original might be a safer bet. Larry Pina says avoid ECG379, it can cause left side screen foldback issues in the raster. ECG specs for the ECG379 read IDENTICAL to Motorola MJE13007. I don't know for sure that your...