1541 Hardening

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jrubin
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1541 Hardening

Post by jrubin » Sun Nov 16, 2014 12:48 am

Its that time of the year. Fix up and do maintainance on the ol 1541

Drive was aligned using the v1541 disk as a reference. Good bump and good seek to 18. Hit every track 0 to 18 to 35.


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My favorite heat sinks, have commodore stuff filled with em, interestingly, IC labeled as 5 in my diagram is hottest not in the center but 4-6 mm off center to the left as shown

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and a little infra red testing


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motrucker
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Re: 1541 Hardening

Post by motrucker » Wed Jul 22, 2015 1:37 pm

Have you ever thought of removing the PSU from the 1541 case, and using an external unit? That would sure cut down on heat generation inside the 1541 case! I don't think I have ever seen this modification, but it sounds like a good idea.
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eslapion
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Re: 1541 Hardening

Post by eslapion » Thu Jul 23, 2015 1:12 am

motrucker wrote:Have you ever thought of removing the PSU from the 1541 case, and using an external unit?
I did exactly that with a 1541 that was given to me. Works beautifully. The drive weighs 2 pounds less and produces no heat anymore.

I put a power connector identical to the one on 1581 and 1541-II drives.

On my older VIC-1541 with very long board, I replaced the large transformer with a pair of 5V/12V wallwarts installed internally. No more heat there too.

Works real nice.
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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motrucker
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Re: 1541 Hardening

Post by motrucker » Thu Jul 23, 2015 2:16 am

eslapion wrote:
motrucker wrote:Have you ever thought of removing the PSU from the 1541 case, and using an external unit?
I did exactly that with a 1541 that was given to me. Works beautifully. The drive weighs 2 pounds less and produces no heat anymore.

I put a power connector identical to the one on 1581 and 1541-II drives.

On my older VIC-1541 with very long board, I replaced the large transformer with a pair of 5V/12V wallwarts installed internally. No more heat there too.

Works real nice.
That was just an off the cuff idea, but the more I think about it, the better I like it. Now with your response to this, I might try it myself. I should have known you would come up with this idea too. BTW - good to "see" you again.
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yaztromo
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Re: 1541 Hardening

Post by yaztromo » Thu Jul 23, 2015 11:39 am

Have heatsinked my 1541 also. One thing I heard though is that some of the chips that run coolest in that drive also seem more prone to fail. So I wonder if the failures are not all heat related?

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Re: 1541 Hardening

Post by motrucker » Thu Jul 23, 2015 7:28 pm

yaztromo wrote:Have heatsinked my 1541 also. One thing I heard though is that some of the chips that run coolest in that drive also seem more prone to fail. So I wonder if the failures are not all heat related?
I only have one 1541, and it has a couple of issues, although nothing terrible. I switched to 1571 drives several years ago. The previous owner had already added heat sinks to this 1541, but you could still roast hot dogs over it. Looks like I will have dig in and remove the PSU from it.
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eslapion
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Re: 1541 Hardening

Post by eslapion » Thu Jul 23, 2015 9:22 pm

The built-in power supplies of 1541/2031 drives is incredibly inneficient.

Old VIC-1541 drives with very long boards consume about 1A on the 5V and 800mA on the 12V when spinning and 120mA when not spinning, that's about 15 watts when spinning and less than 6 watts when not spinning. The power cord actually draws 35 watts from the mains; this means there's constantly 20 watts of heat being released by the various components of the power supply at all times.

The figures are similar with a standard 1541 except it consumes 600mA on the 5Vdc source.

IMHO, putting large heat sinks on the chips only contributes to the chips absorbing the heat from the large voltage regulators and diode bridges.
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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Zippy Zapp
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Re: 1541 Hardening

Post by Zippy Zapp » Fri Jul 24, 2015 7:00 am

eslapion wrote: IMHO, putting large heat sinks on the chips only contributes to the chips absorbing the heat from the large voltage regulators and diode bridges.
How about a small 12V fan on the top of the case or somewhere that forces air out? I typically use 1571s these days. Have a few 1541/c's and a 1541-II which obviously stays nice and cool.
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Re: 1541 Hardening

Post by yaztromo » Fri Jul 24, 2015 9:12 am

Was also considering something similar. Like mounting a fan inside that forces air out of the rear vents. Could be run at 5v to keep it silent.

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Re: 1541 Hardening

Post by eslapion » Fri Jul 24, 2015 8:01 pm

A small fan can always help with the thermal aspect. Back in 1986, I put a fan connected between the 5V source and the 12V source inside my first 1541 so the fan ran at 7V.

However, with 1541 drives being as old as they are, a fan will contribute to increase dust accumulation.
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders

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