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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…
... , I use those)
tr4 = ZTX650, ZXT651 (ebay)
tr5 = ZTX750 ... -
Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…
Hi,
I have a issue 3B that has:
MPS 2369 in TR1, TR2, TR3 and TR6.
By the looks of the solders, they weren't replaced. They were placed during factory production.
Hope that helps. -
Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…
Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…
DEATH let me remind you that I was having overheating problems when using the BC487 instead of ZTX650 as a tr4 (in 3 boards). When replaced with the ZTX650 no problems any more.Interface 1 electrolytic capacitorsInterface 1 has three 47μF electrolytic capacitors. Is it necesary to replace them with fresh ones? I always do this with old speccys but is it…
... times, changing the two transistors (tr1, tr2 i think, those two ...Interface 1 electrolytic capacitorsInterface 1 has three 47μF electrolytic capacitors. Is it necesary to replace them with fresh ones? I always do this with old speccys but is it…
... times, changing the two transistors (tr1, tr2 i think, those two ... minimal?
Indeed, changing TR1 and 2 can make a ...Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... finks us be twas the ztx650 tr4 -5volts driver twas short ...Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... finks us be twas the ztx650 tr4 -5volts driver twas short ...Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…
ZTX 312 at TR1, TR2, TR3 and TR6 on an issue 3B board.Broken 128+2 :(Just got my eBay Speccy through the other day, plugged it in and everything but the red light on the keyboard doesn't come on and there's no connecti…
... grey +2, check out TR9 ZTX650 and if that doesn't ... with this problem? Changing the ZTX650 in that machine can also ...Speccy 128 QuestionMainly for the experienced speccy resurecters around these parts. Have you ever had a Speccy 128 with a borked TEA2000 video chip? The reason I ask…
... (the capacitor) to emitter of TR1 (TR11 - number depends on version ...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…
... /> i mean the black transistors TR1
TR2 TR3 TR4 TR5 ... Amp + audio mixer
TR1+TR2+TR3 -> Composite Video ...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…
... Amp + audio mixer
TR1+TR2+TR3 -> Composite Video ...Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... voltometer, i tried replacing the ZTX650 transistor with a brand new ...Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... it fail along with the ZTX650? Anyway i've tried everything ...Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... it fail along with the ZTX650? Anyway i've tried everything ...sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
... used for the analog circuits. TR1 and TR2 are used in ...Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…
... .[/QUOTE]
The blown ZTX650 on just one spectrum board ... power off ofcourse).
The ZTX650 didn't blow on the ...Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…
... the board that blew the ZTX650 had an eprom installed and ...No colourHi! I'm trying to fix a 6A 48K machine that outputs no colour and shows the characters as if they were in bold. So far, I've done a couple of thing…
... subcarrier or not.
TR1 and TR2 are mixing the ...Classical music on the Speccy?While I was watching CVP409 videos on YT, I found a few movie scores and it made me start yet another topic about the AY chip. I know the beeper and…
... (after my studies).
Tr1 & Tr2 1969, Hans Werman ...Classical music on the Speccy?While I was watching CVP409 videos on YT, I found a few movie scores and it made me start yet another topic about the AY chip. I know the beeper and…
... (after my studies).
Tr1 & Tr2 1969, Hans Werman ...Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... /> So far I have replaced ZTX650 with a good 2 Ampere ...Plugging a 48K rubberkey into a VGA/DVI monitor: doable?I'm sure this has been answered before but searching for "monitor" and "vga" gave me a squillion results, none of which appeared relevant. Simple ye…
... 's composite output is via TR1/2 which form an [URL ...Speccy 48In my messing around with hardware, I have managed to nacker a Speccy 48 board. Specifically, i have managed to mess up the power inverter section. …
... before. I used the standard ZTX650 transistor as a tr4, i ...Awful image on 128K +2B / CV mod not workingHello, My two +2 B output a terrible image through RF. Lots of shadows and moiré patterns. One is slightly better than the other, but really ba…
... solder it to emitter of TR1.
Look here: [url ...Awful image on 128K +2B / CV mod not workingHello, My two +2 B output a terrible image through RF. Lots of shadows and moiré patterns. One is slightly better than the other, but really ba…
... solder it to emitter of TR1.
Look here: [url ... output to the emitter of TR1 makes a big difference. So ... the C31 to emitter of TR1 fix) and a noise free ...issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…
... /> oops i forgot about tr4 ztx650 nothing interesting i simple changed ... this one with another ztx650
i hope that ...Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…
... the schematic, I'd suspect TR1 or TR2 transistor (both ZTX313 ...
