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pb3623

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  1. AR - I just got a 550c with 167 MHz PPC and LOVE IT! I also put a SCSI2SD in it over the weekend. Internally, it works great. One of the things I saw on Low End Mac, after a ton of troubleshooting is that neither the PB 100- nor 500-series supply termination power to external SCSI (in our case the HDI-45)... at first I thought it was the adapter or the nature of the HDI interface but it's apparently a model "feature" or limitation. I can take the drive, plug it in to the DB-25 on my TAM and it books right up. I don't have a 5V adapter via molex or barrel adapter so I can't test using external power but thought I would share this. This made things a major pain in the ass, trying to upgrade from a physical drive to SCSI2SD. I had to use the TAM as temporary storage to copy folders over.
  2. pb3623

    PowerBook 520c keyboard

    Thanks, @JDW - I knew you would be able to weigh in I asked about 一 because my 145B keyboard has it screened onto the 1 key - but I understand sensibilities change over time and someone obviously decided, as you say, that the JIS layout was just too cluttered. As to why? Well, the 550c was only sold in Japan so it makes sense to have a JIS keyboard... so if I can't find the original 550c model in black, the next best thing is to steal a gray one from a 520c. Thanks for the great Macworld story!
  3. pb3623

    PowerBook 520c keyboard

    I misspoke - I meant for my 540c. So donor 520c gives up the LCD to the 540c that has a bad lower half (ribbon cable maybe?) and Japanese keyboard to the 550c.
  4. pb3623

    PowerBook 520c keyboard

    That's true. I wanted the option for a JIS keyboard instead of US. Since my last post, I found exactly what I needed for the time being - a 520c on eBay with a missing trackpad and not in the best of conditions, BUT a kana/Kanji*** keyboard and replacement LCD to donate to the 550c. I don't mean to hijack the thread but at the end of the day, I want to have the correct original Japanese keyboard on the 550 - one in black and one in gray (from the 520) *** @JDWcan set me straight because I know JIS is the industrial standard which includes writing systems but, aside from Kanji/Chinese written, I'm afraid I'm still foggy on the other systems. First pic is not my 550c as it has the original keyboard. Second pic is the 520c I got on eBay this morning. Shouldn't 1 be represented as " – " ?
  5. pb3623

    PowerBook 520c keyboard

    @CC_333 What about outside of the 500 series? I have a 550c coming from Japan but, strangely, it has a standard US keyboard. If the 550c itself is rare, I imagine a black 550c Romaji/Kanji keyboard is even rarer but would, say, a 190/3400 keyboard work in it?
  6. pb3623

    Wiki/Pages article ideas

    How about ROM-inator ROM images for writing to SIMMs with various configurations and sizes (e.g., w/ Turbo 040 driver, w/ RAM check disabled, ROM disk, regular vs. MEGA SIMM) STL files for 3D-printed case/chassis parts, bezels, etc. (i.e., true parts and not a Mac Plus Apple Watch holder) I've seen both of these topics scattered across posts and it might be a good thing to have them all on the same page - it would probably encourage others to contribute.
  7. pb3623

    Adding Wi-Fi to my Mac SE/30

    I'm not back in town until next week. I'll attach a pic. Aside from the 'stub' that the card plugs into, everything else is inside the case - but yeah, maybe a spring-loaded slot next to the brightness knob or programmer switch.
  8. I have the same issue with one of my Q700s - I still haven't found the issue. I thought it was a PRAM issue where it was corrupted (and went through all sorts of acrobatics to get Sticky Keys installed so I could navigate through TechTool and fully zap PRAM)... clearly it's not impossible and there appear to be at least 3 of us with this issue. Maybe my thread can help provide some data points.
  9. pb3623

    Adding Wi-Fi to my Mac SE/30

    I use this microSD extender and actually thought it would be neat to thread it through the security lock slot (which you have to do from the outside) to minimize slack or pinch points. Just make sure you remember to disconnect it from the SCSI2SD before you rip the bucket off! https://www.amazon.com/LANMU-Extension-Flexible-Monoprice-Raspberry/dp/B01D9JIUU0/ref=sr_1_2?keywords=micro+sd+extender&qid=1581536701&sr=8-2
  10. pb3623

    Need help with TAM cooling fan!

    Well, I did find out that, somehow, my DMM's 250 mA fuse had blown (it's opaque so I couldn't visually tell - I assume it's a ceramic - but there's no continuity). So I need to replace that. Should I be able to measure low current like this (less than 1A) using the 10A socket? As long as the range is properly set? Talked to the seller, he states it definitely was working without issue before he shipped so it must be something that failed spontaneously (and coincidentally) or failed due to internal damage in transit. I know voltage (potential) can exist without current (flow), but is there anything that would measure a 12V difference in potential without current? A bad ground? Does LaForge need to reverse polarity on the plasma coils?
  11. pb3623

    Need help with TAM cooling fan!

    Good morning! I will verify the condition of the DMM fuse when I get back to town. My DMM is nowhere near the quality of a Fluke. It does have 300mA/voltage and 10A sockets. I assume the 10A dial setting is for the range and not required for operating w/ the probe set to 10A. But I've been leaving it in the default/300mA socket since we're talking about 60-90 mA fans.
  12. pb3623

    Need help with TAM cooling fan!

    Haven't forgotten about this request. I'm happy to do that as soon as I get back in town from Spring Break holiday... probably Wednesday. Maybe it's my DMM, but putting it in series (3P to 5P, 5N to 4P, 4N to 3N) with the fan measured 0 amps, which I know is invalid and suggests the circuit is broken. Now, when I measure voltage IN SERIES (which I believe represents the sum of the voltage drops across each component), it's also 0. So, if I did everything right, this means the fan isn't working? But connect it to a 9V battery again and it spins up.
  13. pb3623

    G4 Cube DVDRW drive

    I've been boiling the belts in the two Cube drives I have, just to buy some time before they either break or stretch back out. Pictures would be appreciated. I bought what I thought was a Cube DVD-RW drive but the listing was wrong and it's a slot loader for a 2011 iMac. Would like to attempt a transplant since it's basically free to me (if I can use it, I won't claim the refund!)
  14. pb3623

    Need help with TAM cooling fan!

    So, I had so many fans out, just for size comparisons, yeah - my scale is off. I had a couple of 1.0 and 1.2-amp fans that were obviously on the big side (~120 mm) and I didn't use them for this test. But I did have a pair of 40 mm units - 12 V @ 60 and 90 mA (not 600/900) and I know they electrically work because I used a 9V battery to power them. I agree, using something like a 12V sealed lead acid battery would be apples to apples but didn't see 9V as being a bad short-term power source (at least to rule out fan failure - debris, etc). They're obviously low torque so I'd assume you could continue to drive one all the way down to maybe 4V or so. When I see "12V rail" I automatically assume the +12V supply coming from the PSU. In this case, it's a 2-pin fan header on the board that measures +12V, pin to probe. If I splice the wires and probe in series with the fan (thus sharing the 12V), the voltage drops to around +1V. Am I doing this wrong? Should I be measuring current in series instead of voltage? Or measure in parallel? Either way, what I intended to say (and this seems normal/WAI) is that the fan header appears to be capable of providing 12V, and I'm able to power the fans externally, so could it be something else? What you seen in the picture (since you're not familiar with the TAM) - it's basically a PM 6500 logic board turned 90 degrees counter-clockwise (ports on the right). the +12V fan header J17 is half-way down on the left, above the RAM. There is a 40 mm fan connected but not running. The stock fan has the red/blue leads. I ran two trace wires from the fan connector to test with the 9V battery (which worked).
  15. pb3623

    Need help with TAM cooling fan!

    Hey Byrd - Thanks for your note! The TAM absolutely boots - in fact, it runs fine (until it freezes), which led me to take off the fat back and see the bracket fan wasn't running. I brought up the 9V battery since I used it to test the fans themselves to make sure they weren't seized up w/ crud. I read somewhere once that the secondary fan (that's mounted behind the outlet on the back case) only comes on when needed but I can't find that reference anywhere. On my other TAM, the fan comes on immediately, which is what I assumed is normal behavior for a 2-pin fan... a 3- or 4-pin header would be needed to control the tach and report back to the BIOS. Maybe you hearing the second fan is why it sounds louder? The machine itself is in excellent shape - I really lucked out - cosmetically and electrically. It's been well taken care of. I won't profess to being an EE but I assume a properly sized fan will pull the difference between the ground (+0 V) and power (+12 V). So, if a fan load of 600mA reduces the voltage to +1 V, does that mean ground is bad (and is hot)? So @Byrd, can you measure across J17 without the fan and in series with the fan? @JDW You're a PSU and fan guru. Do you have any thoughts on this conundrum?
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