Apple Iie diagnostic grab screen

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Last seen: 1 month 3 weeks ago
Joined: Mar 21 2019 - 02:13
Posts: 3
Apple Iie diagnostic grab screen

Hello,

i have an apple IIe, first step was to repair the power supply, changing the AC input capacitor.

Now I want to enter the diagnostic screen and I get only garbage. Entering basic display although some garbage screens.

I have attached two screens.

 

How to start the error search?

 

I have:

Multimeter

Oscilloscope

Weldering tool

 

Thanks for the support.

 

 

 

 

AttachmentSize
Image icon IMG_20190321_065900.jpg6.15 MB
Image icon IMG_20190321_065911_1.jpg651.75 KB
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Last seen: 1 month 3 weeks ago
Joined: Mar 21 2019 - 02:13
Posts: 3
hello,

hello,

have nobody an idea why my IIe only prints strange letters?

 

 

thanks

 

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Last seen: 10 hours 37 min ago
Joined: Apr 13 2006 - 22:28
Posts: 91
Check the RAM

If the PSU is known to be good, I would be looking at the motherboard RAM next.

 

If you place your finger on the RAM chips while the system is running, do any of them feel hot? By hot, I don't mean warm, but rather uncomfortable to leave your finger there for more than a few seconds. If any do, they are probably dead and will need replacing. Unfortunately, the absence of heat does not guarantee the chips are good, so they may still need replacing. If none feel hot (shorted internally), you can try piggy-backing a new DRAM chip over each of the motherboard chips one at a time to try and isolate which chip(s) are bad. If you notice a change in behaviour, you've got a possbible culprit.

 

If in doubt, replace all the DRAM chips and install sockets on the motherboard in the process. Of course this assumes that you are fairly proficient with desoldering/soldering.

 

Cheers,

 Mike

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Last seen: 1 month 3 weeks ago
Joined: Mar 21 2019 - 02:13
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hello,

hello,

i swap all the ram chips, and now the IIe is working!

 

thanks

Offline
Last seen: 10 hours 37 min ago
Joined: Apr 13 2006 - 22:28
Posts: 91
Zurück wrote:hello,i swap all

Zurück wrote:

hello,

i swap all the ram chips, and now the IIe is working!

 

thanks

 

Nice one! Another Apple restored to working condition.  :-)

 

Online
Last seen: 1 hour 17 min ago
Joined: May 22 2013 - 20:37
Posts: 158
Polymorph69 wrote:Zurück

Polymorph69 wrote:

Zurück wrote:

hello,

i swap all the ram chips, and now the IIe is working!

 

thanks

 

Nice one! Another Apple restored to working condition.  :-)

 

 

Sweet indeed!

 

Congratulations on getting it going, OP!

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