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  1. Ferrix97

    Repair broken PowerBook hinges and posts with hot air station

    Hi!  A couple of weeks ago I started restoring a PowerBook with the typical issues: Bad caps on the display and stuck hard drive. As usual, when I removed the front bezel and display, all the four supports crumbled into tiny pieces. After seeing that glue doesn't always work and usually...
  2. Ferrix97

    Got another TechStep!

    As I mentioned in another topic a while ago, I was able to obtain a broken TechStep and bring it back to operation by replacing an IC. Well, Today another one Arrived! I got it mainly because I wanted the bag and manuals, that unfortunately were missing with the broken one. I also got...
  3. Ferrix97

    Macintosh 128k issues

    Here are a few measurements: Unfortunately my digital scope is not isolated and the Idea I had in mind (hooking it up to a UPS) only lasted for a few minutes. So I had to use an old 15Mhz Philips with a million hours on the CRT This what I get on the Gate of Q10 This is test point 6...
  4. Ferrix97

    Macintosh 128k issues

    Here's a picture of the carnage: This leads me to believe that the original SCR might not be a E0102. The front is blown, so I thought it was an E0102 by reading this post: https://68kmla.org/forums/index.php?/topic/20838-macintosh-128k-240v-analog-board-component-identification/?p=211733 I...
  5. Ferrix97

    Fixing a Macintosh Classic Rev. 2 Analog board (240V) that shows no signs of life

    This is the third time that I found a board with this kind of issue, the same fix also works with board that produce low voltages at startup and ramp up as they heat up. The Board in question is a 630-0560-240V. This is a 240V international board, but the same fix should work on the US ones...
  6. Ferrix97

    A broken Apple TechStep

    For connecting to the UUT (unit under test) there are all the necessary ports (two serials, two ADBs, SCSI and sound) on a removable module (port pack), not all ports are needed to run a specific test. There is also another serial port on the side of the unit that is used to download test logs...
  7. Ferrix97

    A broken Apple TechStep

    It's a device given to technicians to troubleshoot broken macs, similar to ASD on the todays macs. Before it, they had the AppleCAT (where CAT stands for Computer Aided Testing), they used a working mac to test the broken one.
  8. Ferrix97

    A broken Apple TechStep

    (not sure if this the right place to post this, technically it's a conquest + repair) Sometimes I go on eBay and search for "Crazy expensive Hard to find Items", such as the Apple TechStep. As always, there were just a few units on sale, but one of them caught my eye: It was listed at 99$...
  9. Ferrix97

    DB15 Video to DVI?

    I might be wrong, but this adapter converts DVI to VGA, not the other way around since it is an "active" adapter. DVI-D only contains digital signals. DVI and VGA are quite different (one is a digital interface, the other is analog), sometimes it's easy to obtain VGA from DVI because the analog...
  10. Ferrix97

    Macintosh 128k issues

    Well, downgrading it is easier than expected.  Here's what I've done: Remove all of the non-original modifications (jumper wires and piggybacked chips) Install the missing resistors on RP3 Install a resistor on R4 There are no cut traces to repair At this point, the machine would produce a...
  11. Ferrix97

    3D-Printed Objects

    Hello!, and thanks to 360alaska for sharing the files! I gave the Macintosh Portable foot STL file to a local 3D printing company, and after a few modifications they were able to print it using a flexible TPU filament. the quality is not perfect, but it fits nicely in the portable. They also...
  12. Ferrix97

    Bring back to life a stuck Macintosh Quantum / Conner SCSI hard drive

    It seems like 2015 is the year of failing drives and stuck heads, I've made a very quick and rough video showing how to squeeze out some extra life from stuck drives. This trick also works on the bigger "brick" drives usually found in earlier macs like the SE ad SE/30. And also works on SCSI...
  13. Ferrix97

    Macintosh Portable only works when connected to the AC adapter

    Hello! I recently acquired a Macintosh Portable M5120, when I power it from a brand new (and charged) lead battery, it runs fine until it tries reading from the floppy drive or it spins up the hard disk, at this point the machine goes crazy: sometimes it will freeze, sometimes it will go in a...
  14. Ferrix97

    Another "Ticking" Macintosh Plus ED

    I cleaned and bent back pins in the connector, adjusted the cut-off and... Done! Now I only need to find some ROMs for it Again, out of all of the ABs I've repaired, I've never found one that needed new capacitors (I haven't fully recapped this yet, just swapped two caps)
  15. Ferrix97

    Another "Ticking" Macintosh Plus ED

    The speaker tested fine, so I swapped the main logic board cable and... It also brought sound back! Now I can power the machine without the Variac and it chimes perfectly! At this point, I need to find new contact clips for the cable and them it's ready to go! Oh, and also get rid of those...
  16. Ferrix97

    Another "Ticking" Macintosh Plus ED

    Hello! I recently scored three ED Macs, two Macintosh Plus EDs and a Macintosh ED (which is a 512ke). The Mac ED only needed a quick reflow of the J1 connector. The first Plus ED produced a very quick ticking noise no matter if the logic board was connected or not. I quickly noticed that the...
  17. Ferrix97

    Macintosh PowerBook 145/160/170 battery replacement

    Here is the first prototype I tried it on several powerbooks and it works perfectly! I added a 2A Fuse on the battery output to protect the DC-DC Converter and the PowerBook in case of a problem. I also need to add a battery cell monitor, to make sure that the cell voltages don't go too...
  18. Ferrix97

    Macintosh SE/30 Faint chime and no video, possible short on +5V

    Hello The Analog board is OK, I used another SE Board to test it and it works fine, I also installed the board in another SE/30 and it still shows the same issue: faint chime and no video (screen is totally black) This seems to be a very early revision board, with the yellow-band capacitors...
  19. Ferrix97

    Leaking Capacitors inside PowerBook 500 Series Power Supply

    Hello! I recently scored a couple of PowerBook 540c, together with three power bricks! When I plugged the first one, I heard a loud POP! noise coming from the power supply. I decided to open it using the vise and and after desoldering the bottom shield, I quickly found out what happened...
  20. Ferrix97

    Macintosh Portable M5120 Coil Choke Inductor Pulse replacement

    150uH is the inductance value recommended in the LT1070 datasheet for a 5V to 12V DC-DC Boost Converter They also recommend this inductor, but it is way bigger than the one mounted on the portable. But in the inductor's datasheet, they also specify a "C" size that matches with the size of...
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