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Innes

Yet Another 630 Thread (Power-Up Issues)

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Hello

 

Recently got a replacement Performa 630 after my last one croaked it. I have a quuck question about start-up.

 

So this one needs to be plugged in for a minute or so before it fires up and i'm just wondering why that is. I'm guessing that as its soft power running through the keyboard that some capacitors or the PRAM brick need a bit of a charge first. Anyone able to confirm?

 

In addition, I tried booting it with a Zip drive attached and it wasn't having any of it. I could hear it trying to do somthing, a noise from the main unit and some feedback through the speakers but i'm guessing that the additional power requirements from the Zip just meant it couldn't manage it. A Zip obviously wasn't the most obscure thing in the world, many would have been plugged into 630s so somthings clearly not right. Might a fresh PRAM with a proper charge help? I'm aware that the capacitors are old and all of them this age will need replacing at some point but i'm in no rush to learn how to soulder (yet, one day).

 

Thanks in advance for any input

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First, you tested/swapped out the KBD to eliminate that possibility?

 

I'd try swapping components from the croaked unit first. Both the Audio/Monitor Subassembly and the Front Panel Control Board are Soft Power control points.

 

Start with the Audio/Monitor board. If there's a cold solder joint on the power button, might that be the "warm up bug" culprit? Dunno, but it's an easy swap.

 

Heaven only knows what's going on  in the I/R control box I'd think that might take a bit longer to "warm up." But then again the chassis is a heat spreader for the PSU and the board inside is soldered to the case. Nobody is using an I/R remote in that room are they?

 

Check the exploded diagram of the Service Source, the names are from the 6400 diagram I posted in the sound thread.

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There is a short-circuit somewhere; either from a stuck button (like jt suggests above), or from damage to the power architecture itself. I'm going to go ahead and rule out a PSU voltage decrease, which the first reported issue indicates, because the second issue seems to show the opposite of what you would expect with a drop in voltage. Typically a drop in voltage on the +5VDC TRKL line will reduce amperage, and cause the boot capacitor to stop charging or to charge slowly, which is why an immediate self-boot seems to eliminate that as a possible root cause.

 

If you have a multimeter and you're apt to crack open your 630, I would advise that you verify the PSU is not the issue by checking the voltages it's giving the Mac. If you're not sure how to do this, I can take some photos of me doing it to show where the leads go. Also, here's a pinout diagram for the 630 series PSU, for your reference.

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I can get at the power supplies no problem, but for sure, im not sure where to stick a multimeter so a photo could be very useful. Not sure if this will effect it or not but the old dead 630's power supply was very different to the replacement one. Image below, the working one is behind.

 

This weekend I'll eliminate the 'keyboard or front remote control box' possibilities as I have spares of both 

IMG_20180911_200310 smaller.jpg

Edited by Innes
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also stray remote signals can turn it on, its just a sony power on signal.  I can turn on all my macs and old school tvs at once if i am just right all at once.

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On 10/1/2018 at 11:55 AM, Macdrone said:

also stray remote signals can turn it on, its just a sony power on signal.  I can turn on all my macs and old school tvs at once if i am just right all at once.

I was gonna say the same thing.

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