Apple ][ - UK Vintage Radio Repair and Restoration Discussion Forum

binaryprose · 3rd Jun 2015, 2:00 pm

Hi Guys,
I have a very early Apple ][ 48K series 1 with a UK power supply.
I've been trying to find someone in the UK (preferably in the West Country) who can help me repair it.

Does anyone know of any:
Apple ][ user groups in the UK
Anyone who specialises in Apple ][ repairs

Any help and advice would be very welcome. I tried a few of the bigger US based Apple site and they all though it was a wind up, so they were not very helpful.

Regards
Steven

SiriusHardware · 3rd Jun 2015, 8:57 pm

Did you try the vintage computer forums? There is a dedicated sub-forum for early Apple machines.

Although the bulk of users there are in the USA there's a strong international presence including quite a few Brits and other Europeans.

http://www.vintage-computer.com/vcforum/forum.php

Courtney Louise · 3rd Jun 2015, 10:34 pm

I have a huge collection of apple II parts, cards and software. PM me

Cobaltblue · 4th Jun 2015, 12:06 am

Apple II repairs paid for my wedding!

Mostly the rather rubbish power supply.

The SMP had an underrated switching transistor more suited to 110V even on the Europlus versions.

The irony being that TI had a suitable transistor that Apple didn't use.

I don't think I ever repaired anything else other than PSU's

Cheers

Mike T

Harry40 · 28th Jul 2015, 2:42 am

The big problem working on apple II's is if the chips are soldered in or socketed.
The architecture of the board is unique it uses the timing generated signals to derive most of the other logic, so if the timing is not right it can reflect in the display presentation. If the chips are socketed just methodically changing them can usually work. The original boards were well made and had good track etching.
The power supplies were well designed too but do suffer from capacitor break down especially on the hi volts input circuit. The large switching transistor always got up graded if the original failed.
It would be nice to know the symptoms on the faulty apple. because if the keyboard light comes on the power supply should be OK. Disrupted screen display usually points to timing.

EduardoLM · 29th Mar 2016, 7:46 pm

I know it's an old thread, but I collect these machines and already fixed some, including some that others considered beyond repair. So, I will be glad to help!

I also have a stock of EPROMS (2716 and 2732), 6502 and 65C02 processors, and some hard to find ICs like the 8T28 transceivers, that I can send you if needed.

Eduardo

3rd Jun 2015, 2:00 pm	#1
binaryprose Retired Dormant Member Join Date: Jun 2015 Location: Bath, Somerset, UK. Posts: 1	Apple ][ Hi Guys, I have a very early Apple ][ 48K series 1 with a UK power supply. I've been trying to find someone in the UK (preferably in the West Country) who can help me repair it. Does anyone know of any: Apple ][ user groups in the UK Anyone who specialises in Apple ][ repairs Any help and advice would be very welcome. I tried a few of the bigger US based Apple site and they all though it was a wind up, so they were not very helpful. Regards Steven

3rd Jun 2015, 8:57 pm	#2
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Apple ][ Did you try the vintage computer forums? There is a dedicated sub-forum for early Apple machines. Although the bulk of users there are in the USA there's a strong international presence including quite a few Brits and other Europeans. http://www.vintage-computer.com/vcforum/forum.php

3rd Jun 2015, 10:34 pm	#3
Courtney Louise Octode Join Date: Sep 2005 Location: Welshpool, Powys, Wales Posts: 1,327	Re: Apple ][ I have a huge collection of apple II parts, cards and software. PM me __________________ *33, 45, 78, around and around they go...*

4th Jun 2015, 12:06 am	#4
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,865	Re: Apple ][ Apple II repairs paid for my wedding! Mostly the rather rubbish power supply. The SMP had an underrated switching transistor more suited to 110V even on the Europlus versions. The irony being that TI had a suitable transistor that Apple didn't use. I don't think I ever repaired anything else other than PSU's Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

28th Jul 2015, 2:42 am	#5
Harry40 Retired Dormant Member Join Date: Oct 2007 Location: Plymouth, Devon, UK. Posts: 51	Re: Apple ][ The big problem working on apple II's is if the chips are soldered in or socketed. The architecture of the board is unique it uses the timing generated signals to derive most of the other logic, so if the timing is not right it can reflect in the display presentation. If the chips are socketed just methodically changing them can usually work. The original boards were well made and had good track etching. The power supplies were well designed too but do suffer from capacitor break down especially on the hi volts input circuit. The large switching transistor always got up graded if the original failed. It would be nice to know the symptoms on the faulty apple. because if the keyboard light comes on the power supply should be OK. Disrupted screen display usually points to timing.

29th Mar 2016, 7:46 pm	#6
EduardoLM Retired Dormant Member Join Date: Mar 2016 Location: São Paulo, Brazil Posts: 9	Re: Apple ][ I know it's an old thread, but I collect these machines and already fixed some, including some that others considered beyond repair. So, I will be glad to help! I also have a stock of EPROMS (2716 and 2732), 6502 and 65C02 processors, and some hard to find ICs like the 8T28 transceivers, that I can send you if needed. Eduardo