68kMLA Classic Interface
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| Click here to select a new forum. | | A few SE/30 Reloaded Build Questions | Posted by: smrieck511 on 2025-07-28 08:15:14
As I’m working on an SE/30 reloaded board, a few questions have arisen, If anyone would like to offer any knowledge or advice, I’d appreciate it.
1] U32 Crystal Oscillator (see pic) appears to be polarized based on the silkscreen on the board? As I was cleaning the parts, the writing on the top of mine was washed away (yes dumb). If it is polarized, is there a way for me to test it? Could anything be damaged if it was installed backwards?
2] What the heck is 321 L2 (see pic)? Does it need to be installed in a particular way as there is no indication on the part.
3] I have a socket for the CPU. Is the consensus that using a socket for the 68030 is a good or bad idea? Someone mentioned in a video that NOS chips may have difficulty making good contact with socket and therefore recommended soldering directly to the board.
4] As I removed the floppy port from the old SE/30, some of the pins were damaged. I can repair them but I noticed that the pins had something that looked like tiny resistors built in? Am I dreaming?
5] My GLUE chip may or may not be working as it was somewhat corroded on the battery bombed board. I cleaned it and the pins look ok under the microscope. Is there any way to test it before I install it? | Posted by: smrieck511 on 2025-07-28 08:16:12
Sorry, here are the pictures. | Posted by: robin-fo on 2025-07-28 08:47:44
1] U32 Crystal Oscillator It is important how you orient it! Carefully look at the shape of the metal: Three edges are rounded, one is sharp. This is also reflected on the PCB silkscreen. The sharp edge is pin 1.
2] What the heck is 321 L2 It‘s some sort of inductor (or rather three of them I think). Orientation should not be important in this case.
3] I have a socket for the CPU. Is the consensus that using a socket for the 68030 is a good or bad idea? Someone mentioned in a video that NOS chips may have difficulty making good contact with socket and therefore recommended soldering directly to the board. I‘d use the socket. The first batch of SE/30s were shipped with socket, so this should be no problem.
5] My GLUE chip may or may not be working as it was somewhat corroded on the battery bombed board. There is no way to check it, except in a working early Mac II series machine (II, IIx, IIcx, SE/30, LW IINTX..). My personal recommendation: carefully clean the chip and solder an SMD PLCC socket to the board. If it turns out to be bad, it will be easier to replace.
4] As I removed the floppy port from the old SE/30, some of the pins were damaged. I can repair them but I noticed that the pins had something that looked like tiny resistors built in? Am I dreaming? Do you mean the external floppy port? This sounds very unlikely.. could you post a photo? | Posted by: finkmac on 2025-07-28 08:53:57
5] come on, man. we already talked about this | Posted by: smrieck511 on 2025-07-28 09:23:52
It is important how you orient it! Carefully look at the shape of the metal: Three edges are rounded, one is sharp. This is also reflected on the PCB silkscreen. The sharp edge is pin 1.
It‘s some sort of inductor (or rather three of them I think). Orientation should not be important in this case.
I‘d use the socket. The first batch of SE/30s were shipped with socket, so this should be no problem.
There is no way to check it, except in a working early Mac II series machine (II, IIx, IIcx, SE/30, LW IINTX..). My personal recommendation: carefully clean the chip and solder an SMD PLCC socket to the board. If it turns out to be bad, it will be easier to replace.
Do you mean the external floppy port? This sounds very unlikely.. could you post a photo? Thanks very much for your help! | Posted by: smrieck511 on 2025-07-28 10:42:55
5] come on, man. we already talked about this It's true. Apologies for asking again but I figured I'd get all my questions in one post and was still hoping there would be some way to test it with an oscilloscope, multimeter and the datasheet if it exists. I will accept defeat lol. | Posted by: smrieck511 on 2025-07-28 11:13:37
Do you mean the external floppy port? This sounds very unlikely.. could you post a photo? Right. The external port. | Posted by: jmacz on 2025-07-28 11:39:46
I‘d use the socket. The first batch of SE/30s were shipped with socket, so this should be no problem.
+1 on the socket. Gives you options to add a socketed booster/accelerator later and save your PDS slot / space for other things. | | 1 |
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