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problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... wrong. I would check/replace TR4, TR5 and TR3.
-Check IC1 ... -
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... /> I will replace tr3, tr4, and tr5 if anyone tells which modern ... can use.
tr3 =
tr4 =
tr5 =
Greets,
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... /> I will replace tr3, tr4, and tr5 if anyone tells which modern ... can use.
tr3 =
tr4 =
tr5 =
Greets,
tr1-2-3-4-5hi guys, can someone tell me, what is the exact function of each of the five transistors i have on my zx+3 i mean the black transistors TR1 TR2 TR3 T…
... transistors TR1
TR2 TR3 TR4 TR5,
thanx,[/QUOTE]
TR4 -> Audio IN Amplifier
TR5 -> Audio OUT ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... maybe have a problem with TR4&TR5 and your Spectrum doesn ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... maybe have a problem with TR4&TR5 and your Spectrum doesn ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... maybe have a problem with TR4&TR5 and your Spectrum doesn ...Spectrum 48k Fault - anybody seen this before?Hello, I have two 48k spectrums that exhibit the same fault. Black border, paper area is full of columns of wavey lines. I have posted a screen sho…
Thanks guys. I checked my voltages and am missing the +12 and -5. I've ordered some new transistors for TR4 & TR5 and some 4116 DRAMS.
When they arrive I'll follow the repair guide to see if I can get it working again.Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... power circuits around TR4/TR5. A common fault is TR4 (ZTX650) - this poor ...Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
[QUOTE=gibs;431121]... 4/ how to check TR4/TR5 ?[/QUOTE]
When -5V and +12V (at 4116) are present then both transistors work OK. So you checked already.damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... ZX Spectrums, usual suspects are TR5 and (especially, since it is ... doing a tough job) TR4. Often followed by a failure ... bad news: finding replacements for TR4, TR5 or 4116 DRAMs may not ...damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
As roko said: if those voltage readings are correct, TR4/TR5 are fine - leave them alone.damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... bad news: finding replacements for TR4, TR5 or 4116 DRAMs may not ... production transistors that can replace TR4 and TR5, you don't need ...2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... on-board voltage conversion circuitry (TR4/TR5 IIRC), but if caused by ...2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... on-board voltage conversion circuitry (TR4/TR5 IIRC), but if caused by ...2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... if I can replace the TR4/TR5 transistors tomorrow, and hope there ...2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... to get new capacitors ASAP, TR4/TR5 are out of question I ...Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
Never had worn out tr4 tr5. I had either working ones or dead ones.
I have come across worn out (but still working) 7805 voltage regulators causing wavy screen or even colors dissapearing.Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... all the elctrolytic capacitors and TR4/TR5 chips as well as all ...Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... if I order a replacement TR4, TR5 & C46 I should be ...Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... if I order a replacement TR4, TR5 & C46 I should be ...ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…
... I'll try first changing TR4, TR5, C44 and C45 (as suggested ...128k Toastrack repair advice needed..Hey all, Just got my second toast rack in a oddball deal when i visited a local farmer for some other second hand stuff. The 128 was sitting in a p…
... know where to go next.. tr4/tr5 check out ok, so something ...Help changing TR4 and TR5Hi all! Please, help me! :) I think I'm not understanding the correct pins of TR4/TR5 and the transistors. So, if anyone know the correct pins, help …
... and BC307 to use in TR4/TR5.
And I found some ... original pins that?
TR4 TR5 TR4 TR5
E C |\ /|
For TR5 I use BC557 instead BC307 ...Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
Well replaced TR4/TR5 again, and still no -5V :(
Cheers.
Phill.Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…
If all three TR4, TR5 and TR7 transistors were wrongly installed in reverse by amstrad (except just tr4), why didn't anyone else mention it?
Even at Velesoft's web page, there's only info about fixing the tr4....+2 grey rf out problemI got a kind of broken +2. it basically works, but with a annoying rf out problem. When screen goes black (eg. after border 0: paper 0 command) it l…
Can anyone else confirm that all three transistors (TR4, TR5 and TR7 (all type 2N3904)) need to be reversed before I start doing it? :)Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…
... =gtsamour;674982]If all three TR4, TR5 and TR7 transistors were wrongly ... reverse by amstrad (except just tr4), why didn't anyone else ... only info about fixing the tr4....[/QUOTE]
I think ...
