68kMLA

ahh hello again my nemesis. man i was not looking forward to cracking open my qt150. writeup would be very appreciated.

@finkmac there's so many of them, I've only ever seen them on old hard drive PCBs. I imagine they'll be a pain to desolder (can't twist, AND they're glued) and also replace with something that fits the footprint. But don't worry – I'll select appropriate replacements and share a BOM.

they're basically a radial lytic cap in a funny box. similar ones are used on powerbook/thinkpad LCDs, gamegear PCBs, PC98s, etc. generally they're easily replaceable with a radial capacitor... just bend the leads and solder. as for removing, usually they come off fairly easily if you cut the leads. you could also cut the shell...they're fairly fragile.

Urgh, not happy to find out that the QT100/150 is full of caps. I've got a minty QT150 that's working perfectly, I suppose I should look into getting it recapped before something goes wrong. But thanks for highlighting this.

I would like a write-up. My QT100 that i got as a christmas present in 1995 is sadly dead from a leaking battery. The QT150 that i bought for cheap in 1997 is still working like a charm after i replaced some caps in 2020. The source for the sealed polymer caps is sadly not available anymore since the seller has closed shop in 2022. The caps were overstock from a customer requested limited production run at Kemet.

@stynx are you referring to these?



Edit: Just checked they’re definitely fluid-filled (so not polymer):



I’m planning to just use radial caps on their sides, paying attention to dimensions when doing component selection.

Mm tasty syrup.
Here’s a 9821 I did, you can see the sideways mounted caps

Nice job - what’s a 9821?

NEC PC-9821-ap2, one of the PC-98s. A Japanese PC-Incompatible DOS computer.

@croissantking I replaced the electrolytic caps with polymer caps. The polymer caps were in a similar plastic housing and did fit very well in the QT150.

A write up would be much appreciated. I tried taking mine apart, as it's exhibiting issues, but at a certain point I just don't know where to go to actually get the boards out.

Wow, quite a few of you have those quick take cameras. Do you guys have samples of images taken with them? Not expecting much but curious. I remember playing with them back in the 90s.

@jmacz the quality is pretty awful, haha. There’s a thread for QuickTake photos here.

So, although I haven't figured out exactly what the capabilities of the MB89765AH are (can't find a data sheet - well I can, but from Jotlin or something that requires me to set up an account). I do know it's an 8-bit MCU.