From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2004-11-22 06:28:42
I concur with the bad rom thoughts. I dont know how closely related the 1541 kernal is related to this system's kernal, but the flashing indicates a bad rom (or ram?) on the 1541. At any rate, check the logic board for cracks and see if there's any loose/bad components. -David On Sun, 21 Nov 2004, William Levak wrote: > On Sun, 21 Nov 2004, Marko [iso-8859-1] Mäkelä wrote: > > > Remember the CBM 220 (a.k.a. 8296D) whose drive analog board was broken in > > two halves? Well, I ended up buying it, and thanks to Ruud Baltissen, the > > system now has a healthy-looking analog board. However, the drives still > > do not work. > > > > When I power up the system, the disk status LED between the drive slots lights > > red for a while (approximately 1 second), then green for approx. 1 sec, and > > then it flashes red once very quickly. The LEDs next to the drive slots > > do not light up. > > This sounds like a ROM error as the initialization is not completed. > > > When I power up my 8250, the middle LED does approximately the same thing, > > but when it blinks red quickly, also the two LEDs at the drive slots blink > > once. > > This is the normal initialization. > > > The drive complains either READ ERROR or DRIVE NOT READY when I try > > DIRECTORY. The drive LED (next to one of the disk slots) remains lit, > > even after querying the error channel, until I issue the "UJ" command. > > > > When I try to format a disk, the drive complains WRITE PROTECT ON, no > > matter which way the disk is inserted, and no matter if I swap the drive > > The write protect switch is connected to a pin on the 6530. This gate may > be bad, or the line may be bad. Check the switch itself. It may be > broken or jammed, or it may not be positioned right. > > > cables. (For each drive, there's one connector for the R/W heads, and > > another for everything else. I suspected that it would be accessing the > > R/W heads in the wrong drive.) > > > > I cleaned the R/W heads, but there was no visible dirt. On the other hand, > > many keys on the keyboard didn't work before I took the keyboard apart and > > washed everything except the circuit board. > > 90 percent isopropyl alcohol is good for cleaning circuit boards. > > > Does anyone have any ideas where to begin troubleshooting? Is the behaviour > > of the LEDs normal? I'd otherwise swap parts with my 8250, but the built-in > > drive unit of the 8296D looks completely different. > > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing list
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