Red light and motor stay on in my old 1541 disk drive

[Juhani Jaakola]

I tried my Commodore 1541 disk drive after it has been in my attic
unused for years. The green light and red light and the spindle motor
turn on when I power up without the computer connection. Shouldn't the
red light and motor turn off after two seconds? In my case they just
stay on!

The drive does not work when I connect it to computer. The red light
and motor just keep going...

I have read http://personalpages.tds.net/~rcarlsen/cbm/fix1541.txt by
Ray Carlsen. I have PCB # 1540050. I have measured that I have 5V and
12V on diodes CR2 and CR4. I have lifted ICs UB4, UC4 and UC2 up and
pushed them back down in order to fix any contact issues. I looked at
UA1 and UD2 and I can't see visually any damage.

Is there anything else I could do?

[JPPBM]

For Drive motor running continuously & RED LED staying ON....Check you
have+12V & check the 6502 (Swap it out with a know working one from
another drive) One of these is the most likly cause... if not then
there are a few Logic gates that support that 6502 that may be sending
it the bad signal...

[DMackey828]

I had the same problem on a 41' I picked up. It may also be one of the
CIA chips. Switch them around. There's 2 of them, if the problem goes
away, on of the chips is bad..

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