My ongoing LC 475 restoration

[cheesestraws]

Next step will be to sort out a hard disk

If you haven't got to this by the end of lockdown, I have a spare suitable HDD (80meg I think) that you are welcome to to check the internal SCSI bus works before you spend any money on it. (I'm a bit south of you but head to Reading reasonably often, or could dump it in the post).

 

[joshc]

Could just be a dud speaker in that case, it's possible.

Nice job on the logic board recap. Since it's an LC, I would recommend a recap of the power supply too. Both TDK and Astec variants exhibit issues relating to worn out leaded electrolytic caps at this age.

 

[Paulie]

If you haven't got to this by the end of lockdown, I have a spare suitable HDD (80meg I think) that you are welcome to to check the internal SCSI bus works before you spend any money on it. (I'm a bit south of you but head to Reading reasonably often, or could dump it in the post).

At this rate, I'll have bought and rebuilt a whole army of 90s Macs before lockdown ends! I'm hoping to pick up an SCSI2SD at the end of the month (if the board doesn't work, at least I have one for the next machine (uh oh  :lol: )). But fair point; I mean there must be a reason why this machine was dumped. I suspect the dead floppy drive at the moment.

Could just be a dud speaker in that case, it's possible.

Nice job on the logic board recap. Since it's an LC, I would recommend a recap of the power supply too. Both TDK and Astec variants exhibit issues relating to worn out leaded electrolytic caps at this age.

Sounds good, I'll raid another PC speaker from somewhere and investigate.

I have Dyna Comp PSU, should I still worry? It seems to work perfectly fine at the moment, but I could always take it on with my new-found soldering skillz.  [8D]

 

[joshc]

I haven't heard about the Dyna Comp ones, they will use similar components to the other PSUs and at this age all electrolytic caps should be replaced IMO.

 

[PotShotScott]

Can you expand on dip switches you mention?  I have an LC475 and can't get video on VGA on my garage LCD.  My first thought is you made selections on your TV to hit 66.7 Hz.  Am I correct?  I don't think I've ever seen dip switches in my LC 475

 

[cheesestraws]

Can you expand on dip switches you mention?  I have an LC475 and can't get video on VGA on my garage LCD.  My first thought is you made selections on your TV to hit 66.7 Hz.  Am I correct?  I don't think I've ever seen dip switches in my LC 475

The DIP switches are on the adapter, not in the LC475.  The computer detects what kind of monitor it has attached by means of sense lines on the connector; the DIP switches on some adapters allow you to fiddle with those sense lines to tell the computer to output a different sync rate.

 

[PotShotScott]

Thank you - the cheap adapter I bought on Amazon didn't come with switches (sigh)

 

[Byrd]

Thank you - the cheap adapter I bought on Amazon didn't come with switches (sigh)

It's the generic non-DIP switch adapters that I go for first as they usually work without issue (eg. the beige, Apple or NEC ones are my choice); try another monitor.

I find the more complex adapters add another layer of complexity to getting an old Mac up and running, you only needed the adjustments if running a particularly fancy high resolution monitor in the day.

JB

 

[MrFahrenheit]

It's the generic non-DIP switch adapters that I go for first as they usually work without issue (eg. the beige, Apple or NEC ones are my choice); try another monitor.

I find the more complex adapters add another layer of complexity to getting an old Mac up and running, you only needed the adjustments if running a particularly fancy high resolution monitor in the day.

JB

I fully agree with you here. I have a bin full of the NEC multi sync adapters that too out at either 1024x768 or 1280x1024 (I think) and have the built in ability to scale the resolutions between 640x480 to the max resolution without dip switches. 
 

I have yet to have any issues driving a display from a IIcx all the way up to a 8600 (and everything, literally, inbetween) using the same adapter. 

 

[PotShotScott]

I'll try another monitor.  Thanks for the suggestions.

 

[cheesestraws]

It's the generic non-DIP switch adapters that I go for first as they usually work without issue (eg. the beige, Apple or NEC ones are my choice); try another monitor.

I fully agree with you here. I have a bin full of the NEC multi sync adapters that too out at either 1024x768 or 1280x1024 (I think) and have the built in ability to scale the resolutions between 640x480 to the max resolution without dip switches. 

Fair; the adapters I seem to have ended up with all (but one) have DIP switches, so I don't know much about the multisync ones.