Juror22
Well-known member
Non-backlit, 1MB memory, sys 6.0.7 (on floppy) HD did not work
Booted once when I first got it (after removing the HD), and I could not get it to start up after that.
So I took it apart, and quite a few of the caps were leaking. Just oily wetness and very minor corrosion around a few chip connections. The traces all appeared to be untouched.
Now, after the recapping (pretty sure that went well - no issues were apparent anyway) here is what I see, hopefully someone can point me to what may be the cause (or a schematic) and I can go from there...
With 3A 7.5v adapter plugged in, no main battery, 9v backup in and the lid to the battery compartment closed, all things plugged in but the HD.
1) Pressing a key on the keyboard, the machine makes noise and the screen goes to a pattern that has some light in it, the disk drive makes a brief noise, then the pattern goes to a 50% vertical and then stays there.
a) Resetting the machine with just the reset switch makes a crackly sound in the speaker, but nothing else. Pressing the interrupt switch does nothing.
b)Pressing both the interrupt and reset switches resets to a blank, clear screen.
2) Pressing a key on the keyboard, the disk drive makes a brief noise, goes again to a dark screen that slowly clears (from R to L) to a 50% grey over a couple of minutes.
Starting without the floppy drive makes no difference except that the floppy drive noise is absent. -otherwise all is the same.
I have visually rechecked the solder joints, but I will check with continuity later.
I tried washing the board (It is drying now). Before, I had only spot cleaned with 98% Alcohol, prior to recapping.
Any ideas or other suggestions?
Booted once when I first got it (after removing the HD), and I could not get it to start up after that.
So I took it apart, and quite a few of the caps were leaking. Just oily wetness and very minor corrosion around a few chip connections. The traces all appeared to be untouched.
Now, after the recapping (pretty sure that went well - no issues were apparent anyway) here is what I see, hopefully someone can point me to what may be the cause (or a schematic) and I can go from there...
With 3A 7.5v adapter plugged in, no main battery, 9v backup in and the lid to the battery compartment closed, all things plugged in but the HD.
1) Pressing a key on the keyboard, the machine makes noise and the screen goes to a pattern that has some light in it, the disk drive makes a brief noise, then the pattern goes to a 50% vertical and then stays there.
a) Resetting the machine with just the reset switch makes a crackly sound in the speaker, but nothing else. Pressing the interrupt switch does nothing.
b)Pressing both the interrupt and reset switches resets to a blank, clear screen.
2) Pressing a key on the keyboard, the disk drive makes a brief noise, goes again to a dark screen that slowly clears (from R to L) to a 50% grey over a couple of minutes.
Starting without the floppy drive makes no difference except that the floppy drive noise is absent. -otherwise all is the same.
I have visually rechecked the solder joints, but I will check with continuity later.
I tried washing the board (It is drying now). Before, I had only spot cleaned with 98% Alcohol, prior to recapping.
Any ideas or other suggestions?
