Amiga Test Kit experts ?

[Nobby_UK]

Anybody figure out what the grab means ?


I happened after 70 odd passes...
of my Kipper 608



Should I switch the jumper to 4 Meg and retry ?

[Nobby_UK]

Switched to 4 Meg --- it made over 102 passes
Before failing

Loosened the screws holding the 608
and it fell off = Bad Connection

[Nobby_UK]

Left it out --- Machine ran for hours

But eventually rebooted to the Test Disk then gave
me one of those black screens full of numbers

Oh dear !

[Nobby_UK]

3 Chips are too hot to touch !
Might try some Heat-Sinks and/or Fans

#Uppdate#
Heat Sinks not helping
U4 still very hot

Fans next --- though why is it SO HOT ?!?!

[admiral]

Originally Posted by Nobby_UK

3 Chips are too hot to touch ! why is it SO HOT ?!?!

Nothing should ever be. Meaning you have some sort of hardware problem. Figure out which chips are hot; I'd guess at least one of them is fux0red.

[Nobby_UK]

As I said U4 = (Super) Denise is Mega Hot

[admiral]

Originally Posted by Nobby_UK

As I said U4 = (Super) Denise is Mega Hot

Just in case, check voltages on the running Amiga.

Also, if you can measure power draw on wall, an Amiga 600+ shouldn't draw more than some 16w.

[Nobby_UK]

4.89 @ Floppy port and 4.79 @ LED connector
12.35 @ Floppy port

I don't have a power meter, but do have several psu's

[Nobby_UK]

Oh dear
Just a Black Screen now

[admiral]

Originally Posted by Nobby_UK

Oh dear
Just a Black Screen now

Do not despair. Leave it alone for now.
Has anything changed before all of this started? Like, any new hardware or cable.
Also, since it's an A600, basic debugging involves removing clip-on-cpu expansions; but testing that doesn't need to happen today.

[Nobby_UK]

It's back...
Nope, just stated (last month) re-setting,
prob would not have know only there was a floppy in the drive
to show something happened.
Striped to basic (bar 604n ?)--- Fan does cool the chips
But it still crashes

[admiral]

It's an A600. If it hasn't been recapped, maybe it is time.
The other common problem is reliability of clip-on-cpu expansion contacts.

[Nobby_UK]

Re-Capped 16/09/2015 with Tantalums.

The only none original thing on board now is the 3.1 ROM

So it must be either a fault on the board or PSU.
Going to swap the PSU --- report back tomorrow.

[admiral]

Originally Posted by Nobby_UK

Re-Capped 16/09/2015 with Tantalums.

The only none original thing on board now is the 3.1 ROM

So it must be either a fault on the board or PSU.
Going to swap the PSU --- report back tomorrow.

4.89v didn't seem too bad. I get spot on (very slightly above) 5v on mine, but it's a fancy new one from c64psu.
Good luck. I hope it really is PSU.

[Nobby_UK]

Well, it was not the PSU ---

It was the ROM ?!?!

Changed it back to the old one (2.05 - 37.350)
Solid as a Rock !

[admiral]

Surreal. Now, I would leave the rom installed for a week or two, to confirm.

Also, how long had the newer rom been installed for? If there was an issue with it, I'm surprised it wouldn't manifest until much later.

Also, keep an eye for those burning hot chips. Maybe they're cold now?

[Nobby_UK]

They are cooler ---

Had the ROM before the Recap

I too was surprised a (relatively) modern chip would fail

[admiral]

Is it a 27c400 EPROM, or else? What's the vendor? Was EPROM window properly covered?

[Nobby_UK]

Has a nice Blue + Boing Ball sticker from Hyperion

[admiral]

Originally Posted by Nobby_UK

Has a nice Blue + Boing Ball sticker from Hyperion

So you paid for it? Only adds insult to injury.

I suggest getting a TL866 clone off aliexpress, and a 27c400/800/etc adapter for it from ebay. This plus some eproms should cost about as much or at least not much more than buying some official pre-burnt rom.

Note you'll have to use the open source burning software (minipro in github/etc), as the official software bricks clones (and is otherwise inferior in every way, as you'd expect).

One of the best purchases I have ever made.