Comments on: Sinclair QL Repair https://www.nightfallcrew.com/12/06/2014/sinclair-ql-repair/ Lightning in the Dark Wed, 24 Sep 2025 08:02:51 +0000 hourly 1 http://wordpress.org/?v=3.4.2 By: Tim Turner https://www.nightfallcrew.com/12/06/2014/sinclair-ql-repair/comment-page-1/#comment-149357 Tim Turner Wed, 18 Sep 2019 00:50:25 +0000 http://www.nightfallcrew.com/?p=10815#comment-149357 I have a ql. that when i plug it into the monitor the screen says f1 for f2 when I push the monitor its not working the tv works i think the color is off though? do you fix them still? I have a ql. that when i plug it into the monitor the screen says f1 for f2 when I push the monitor its not working the tv works i think the color is off though? do you fix them still?

]]> By: Tomas https://www.nightfallcrew.com/12/06/2014/sinclair-ql-repair/comment-page-1/#comment-148239 Tomas Fri, 08 Dec 2017 08:04:51 +0000 http://www.nightfallcrew.com/?p=10815#comment-148239 Ciao, Repairing two MDV units, due to faulty R/W heads, one head replaced with a spare salvaged from otherwise dead units. I am looking for one more head. Can be extracted from faulty QL/ZX drives. Should measure 16/16/96 ohms across 2xRead a 1xerase coils. Can you help? Grazie tanto. T. Ciao,
Repairing two MDV units, due to faulty R/W heads, one head replaced with a spare salvaged from otherwise dead units. I am looking for one more head. Can be extracted from faulty QL/ZX drives. Should measure 16/16/96 ohms across 2xRead a 1xerase coils.
Can you help?
Grazie tanto.
T.

]]> By: Viktor https://www.nightfallcrew.com/12/06/2014/sinclair-ql-repair/comment-page-1/#comment-52505 Viktor Tue, 23 Jun 2015 20:45:13 +0000 http://www.nightfallcrew.com/?p=10815#comment-52505 <a href="#comment-52503" rel="nofollow">@xAD / nIGHTFALL </a> Hello and thank You very much for Your reply, Yes, it was first iv'e checked, i have replaced it with new one, i noticed, that one capacitor (470uF) was burned out, thick one under the Heatsink, so i replaced it, ive checked the power on RAM & ROMS, it is 4.9v on VCC so i think there is nothing wrong with power circuit. also i have got a Minerva rom from Rich, to make a RAM test possible, but installing it makes any difference - i see same squares, no changes. there are changes when i start the QL without ROM chip - i have black screen then, with no squares. I forgot to say, it is a Issue 5 motherboard, and actually i have buyed it broken, so i dont realy know what exacly previos owner have done with it. I see that there are some changes and modifications done. IC17 is removed, the JU2, JU3 and JU4 are dridged, and JU1 & JUt5 are removed. I realy stuck and i don't know where to start, i have many ZX Spectrum repairing experience but i have not repaired QL's till now... @xAD / nIGHTFALL
Hello and thank You very much for Your reply,
Yes, it was first iv’e checked, i have replaced it with new one, i noticed, that one capacitor (470uF) was burned out, thick one under the Heatsink, so i replaced it, ive checked the power on RAM & ROMS, it is 4.9v on VCC so i think there is nothing wrong with power circuit.
also i have got a Minerva rom from Rich, to make a RAM test possible, but installing it makes any difference – i see same squares, no changes. there are changes when i start the QL without ROM chip – i have black screen then, with no squares.
I forgot to say, it is a Issue 5 motherboard, and actually i have buyed it broken, so i dont realy know what exacly previos owner have done with it. I see that there are some changes and modifications done. IC17 is removed, the JU2, JU3 and JU4 are dridged, and JU1 & JUt5 are removed. I realy stuck and i don’t know where to start, i have many ZX Spectrum repairing experience but i have not repaired QL’s till now…

]]> By: xAD / nIGHTFALL https://www.nightfallcrew.com/12/06/2014/sinclair-ql-repair/comment-page-1/#comment-52503 xAD / nIGHTFALL Tue, 23 Jun 2015 07:23:20 +0000 http://www.nightfallcrew.com/?p=10815#comment-52503 <a href="#comment-52492" rel="nofollow">@Viktor </a> Hi Viktor, You have tried if the Voltage regulator (7805) it works ? Output = 5v. @Viktor

Hi Viktor,

You have tried if the Voltage regulator (7805) it works ? Output = 5v.

]]> By: Viktor https://www.nightfallcrew.com/12/06/2014/sinclair-ql-repair/comment-page-1/#comment-52492 Viktor Sun, 21 Jun 2015 13:01:19 +0000 http://www.nightfallcrew.com/?p=10815#comment-52492 Hello, i see that You have a lotz of experience for repairing QL Computers. Can You please take a look of this picture? http://www.mediafire.com/view/t3qe1al898ilqh7/QL.JPG My QL gone broken and Insert of Minerva rom doesent help me further to diagnose it. All i know that the 74LS245 is ok, and it doesent seem to be a ram fault. I've took a working QL from my friend, and tested ULAS, CPU and all chips, all work as it should on other computer so im stuck and need a little help.. with best regards, Viktor Hello,
i see that You have a lotz of experience for repairing QL Computers.
Can You please take a look of this picture?
http://www.mediafire.com/view/t3qe1al898ilqh7/QL.JPG
My QL gone broken and Insert of Minerva rom doesent help me further to diagnose it.
All i know that the 74LS245 is ok, and it doesent seem to be a ram fault. I’ve took a working QL from my friend, and tested ULAS, CPU and all chips, all work as it should on other computer so im stuck and need a little help..
with best regards,
Viktor

]]> By: Ressurreições do dia: Dois Amiga 500+, um Amiga 600 e dois Sinclair QL | Retrocomputaria Plus https://www.nightfallcrew.com/12/06/2014/sinclair-ql-repair/comment-page-1/#comment-31116 Ressurreições do dia: Dois Amiga 500+, um Amiga 600 e dois Sinclair QL | Retrocomputaria Plus Sat, 14 Jun 2014 11:23:24 +0000 http://www.nightfallcrew.com/?p=10815#comment-31116 [...] detalhes e p0rn galerias de fotos aqui (Amigas) e aqui (QLs). Esse post foi publicado em Hardware e marcado Amiga 500+, Amiga 600, Nightfall, p0rn, [...] [...] detalhes e p0rn galerias de fotos aqui (Amigas) e aqui (QLs). Esse post foi publicado em Hardware e marcado Amiga 500+, Amiga 600, Nightfall, p0rn, [...]

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