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Pet 8296D no signs of life

Need i remove the board?
 

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It looks like PCB damage.

No need to remove the PCB just yet.

See if any of the copper PCB tracks are damaged, and clean the area up with Isopropyl alcohol (or some similar cleaning solution).

Then, check for damaged solder joints in the area and re-solder them if necessary.

Dave
 
daver2 said:
It looks like PCB damage.

See if any of the copper PCB tracks are damaged, and clean the area up with Isopropyl alcohol (or some similar cleaning solution).

Then, check for damaged solder joints in the area and re-solder them if necessary.

Dave
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Need i check continuity with tester, right?
 
Yes, you can use a multimeter with the power off.

I would check it with a bright light and a magnifying glass first (but clean the area first to make your life easier).

Dave
 
daver2 said:
Yes, you can use a multimeter with the power off.

I would check it with a bright light and a magnifying glass first (but clean the area first to make your life easier).

Dave
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To remove the board, however, I will have to unscrew the disk from the drive :(
 
Looks like those capacitors have leaked, and that's probably what caused the corrosion. In post 518 there is also some corrosion evident on the top left section of the board. I think it might be worth removing a couple and testing them.
 
eight088 said:
Looks like those capacitors have leaked, and that's probably what caused the corrosion. In post 518 there is also some corrosion evident on the top left section of the board. I think it might be worth removing a couple and testing them.
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Yes, i just removed the little capacitors....tomorrow i ll clean the board and i ll replace caps ;)
 
I am desperate, i cleaned the board and i replaced the little capacitors but i have same situation...
however the motor works, when I launch the command to format the disk, I hear the motor spinning and the red led on the drive lights up ... but nothing happens :(
 
If it is not clear what is supposed to be connected to what, if the other drive has an identical PCB then look at the undamaged tracks on that one to see where the connections should be going from and to. Then, use your meter to see if the same connections are present on the damaged PCB. You may have to make wire bridges across gaps where the copper track has been dissolved away.
 
SiriusHardware said:
If it is not clear what is supposed to be connected to what, if the other drive has an identical PCB then look at the undamaged tracks on that one to see where the connections should be going from and to. Then, use your meter to see if the same connections are present on the damaged PCB. You may have to make wire bridges across gaps where the copper track has been dissolved away.
Click to expand...
Hi, the tracks were intact, I cleaned and restored the solders, changing the capacitors with new ones. The problem lies elsewhere unfortunately ...
 
>>> however the motor works, when I launch the command to format the disk, I hear the motor spinning and the red led on the drive lights up ... but nothing happens

That is not the case from the videos you posted.

The 'working' drive operated the drive selected LED and I heard the motor running.

When you tried the other (non-working) drive I didn't see the drive LED illuminate or hear the motor run.

When you swapped the drive cables around - the fault followed the drive.

When your tried the test in post #512 - you observed the signal connected to pin 5 (the WHITE wire = /MOTOR ON) go LOW. Did you physically see and hear the motor run?!

If the motor DID run, then we are all wasting our time...

If the motor DIDN'T run, then you are not being consistent in what you are telling us...

Also, don't confuse the noise the stepper motor makes (as it drives the read/write head) with the disk rotational motor. They are two completely different things.

Dave
 
Unfortunately I can't see it spinning because the drive is covered ... I seem to hear it spinning though when I try to format the disk :(
 
daver2 said:
I am just confused now???

Down the snake again!!!

Dave
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Update: I removed the drive cover and launched the directory ... sometimes the disk tries to spin or spins very hard and then stops ... sometimes it doesn't spin at all. On the d0 drive, on the other hand, it starts effortlessly! I am desperate!
 
Right.

Does this behaviour coincide with a change in the behavior of the signal on pin 5 of the connector (the white wire)?

For instance, when the motor DOESN'T run, do you see a LOW on pin 5 or not?

If pin 5 goes LOW, but the motor doesn't spin, it is likely that the fault is on the disk drive itself.

Dave
 
daver2 said:
So, the fault is STILL on the disk drive board then isn't it?

Now we need to find the technical manual for the disk drive (including the schematic for the speed controller)...

EDIT: Start here: https://bitsavers.org/pdf/panasonic/floppy/JU-4x5/. Not exactly the same drive - but our starter-for-ten.

Dave
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I suspect bad drive maybe....can i try to replace evey capacitors on speed controller s' board?
 
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