1541-II help

warpdarkmatter · Posted: Sat Jul 07, 2012 9:56 pm Post subject: 1541-II help

i just got a 1541-ii. when powered up the green and red lights stay on and the drive runs continuously i know this could be a faulty 6502 or possibly a bad 251968-03. my first question is are the 251968-03 and the 901229-5 interchangable from a early 1541 if not has any one tried putting a 1541-II drive assembly into a 1541

warpdarkmatter · Posted: Sun Jul 08, 2012 3:11 am Post subject:

Ok so I know the chips don't fit so how about swapping the drive mechanism ? I know some rewiring is required

LordCrass · Forum Junkie Joined: 04 Jan 2002 Posts: 517

I think this problem can be caused by many different issues. I had it a while back, and it was due to a weak power supply. Also, a bad DOS ROM can cause it. If you have access to an EPROM programmer, you can program a new one to try.

Other than that, I think you have to start swapping chips one at a time to see what it is. Start with CPU and VIA. Unfortunately, most chips aren't socketed in 1541-II, so it's a big pain in the ass.

Fröhn · Grandmaster of C64 Joined: 13 Jan 2003 Posts: 1950

First try another PSU. A broken PSU might cause all kind of weird trouble. I had several broken 1541-II PSUs already, so that's a likely issue.

warpdarkmatter · Posted: Mon Jul 09, 2012 8:33 pm Post subject:

power supply seems to check out voltage wise 5v and 12v. funny thing happened i put the drive back together and now its working fine

Oge_user · Posted: Tue Jul 10, 2012 2:23 pm Post subject:

Check out voltages after minutes of usage..

Cheers,
Oge
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warpdarkmatter · Posted: Sat Jul 21, 2012 1:20 am Post subject:

seems all the gremlins are coming from the power supply connector! i wiggle the cable and it ether works fine, floppy drive keeps running, or it shuts off! but at least i know where the problem lies

cdawe · Posted: Sat Jul 21, 2012 5:32 am Post subject: Hard to Find Oge?

Oge, are the power DIN connectors for the drives hard to find? Should imagine the right DIN would be an easy thing from an electronic supply company like Digikey or Mouser ?

C.