Search results

The SE/30 currently boots to a blinking floppy, so it's not a dead machine.  Obviously I will need to recap the logic board and remove the CMOS battery.  Do I need to recap the analog board?  If so, is there any special procedures I need to follow, like discharging the capacitors, etc? ...

Just wondering, would using a DC supply to supply 3.6V to the battery terminals eliminate the need for the battery?  If so, one could conceivably create an adapter to step down 5V off of a USB connector, and have a port for it in a spare NuBus slot or something. 

Update:  I got a startup chime and the machine seems to be booting from its hard drive.  I got a USB-Serial adapter and used the diagnostic mode to determine that the least significant bit of the rightmost RAM stick's databus lines was stuck at 0.  I patched that pin to the matching pin on Bank...

In the meantime, there's a dead trace on the GLUE chip at Pin 14, which according to this schematic is "VIAIRQ1N" which seems like it might be what's causing the Sad Mac.  Am I right in assuming there's no issues with the memory bus since I'm getting a sad mac chime? On a side note, is there no...

I don't have a schematic for a IIx; I have schematics for the II and the SE/30, which I believe is somewhat similar.  I'm just following traces and testing continuity with a multimeter.  Does this board have more than 2 layers?   Turns out there was a broken trace between a capacitor and the...

So I don't know what I did, but it powers up and stays on most of the time now, and the power button can turn it back off.  As I understand it, C7 is responsible for making sure the poweroff circuit doesn't get triggered while I'm trying to power on the machine; its behavior makes me suspicious...

I fixed a bunch of traces, but now have a new problem -- the Mac now shuts down immediately after being turned on.  I suspect that some wiring around U1 is to blame, but I don't see anything wrong.  Any ideas?

I fixed a trace going to the power switch, as well as a trace near the batteries that looked like it was important, though I was having trouble tracing it.  I measured 15 ohms of resistance between +5 and ground.  Is that considered normal?  I'll post detailed photos of the board in a bit. Will...

You're right, there is a dead trace near there, one near the RAM (but it goes to the farthest RAM slot so it shouldn't keep the machine from booting), and one between the two smaller DIP chips near the FPU.  I'll try to bypass them when I next have a chance to go to my local makerspace next...

Follow-up question:  A bit of common advice I've found on this forum is to stick the board in the dishwasher as part of the troubleshooting steps.  I'm willing to do this, but had some questions on the details since I can't find any comprehensive info on it.  I'm assuming I take off all the RAM...

I replaced all the caps already.  Board still does nothing at power-on, and won't turn off until I pull the power cord.   EDIT:  To clarify, pressing the power button does cause the PSU to turn on, and the fan to start spinning.  Nothing else happens after that.

Hey 68KMLA, I recently got my hands on a Mac IIx, with the understanding that it wouldn't turn on; I assumed this was likely due to the PRAM batteries needing to be replaced since this machine won't turn on without them.  I replaced the PRAM batteries, and recapped the board.  However, I still...

I just got my hands on a IIe with a problem:  the video output is fuzzy and almost impossible to read.  However, if I use alligator clips to connect to the metal on the back of the video out jack, I get a perfect signal, meaning that the connection inside the jack must be poor.  Where can I get...

It seems like that the option in Open Transport was the culprit, I didn't actually try to run a browser or anything (mainly because I didn't have one on that drive).  I booted off a drive with 8.1 on it and ran iCab, and it's working fine.

I got an IP from my router (a 172.16.1.x IP address, which my router is configured to hand out), and I could ping it from elsewhere on the network.  The problem is that the Mac disconnects from the network after about 30 seconds and won't reconnect until I reboot.

I'm having the same issue on both Quadras.  The 660av is using it's built-in ethernet with a Farallon AAUI-RJ45 transceiver, and the 605 is using an Asante PDS Ethernet card.  Both are running System 7.6.1.  At boot, the TCP/IP control panel will report a valid DHCP address, but after about 30...

Got a link to some more info on reflowing joints?

I recently acquired (for a good price) a Mac Plus, that looks like it hasn't been touched for a while.  When I went to power it up, I noticed that the CRT was displaying a distorted image (see image).  However, the distortion mostly disappears after a while, and is only visible at the highest...

So does this mean that I just use QuickTime to capture video through the port?

Hey, What am I supposed to use to capture (or view) video on the Quadra? It's hard drive was wiped at least once before it made its way to me, and any AV software that was on it is no longer on it.