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<1…17181920212223…34>
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... BC compatible transistor (to change TR4).
    I bought TIP 31 ...
    guesser guesser April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    Yeah... replaced TR4 by a TIP31 again and... ...
    Turrican Turrican April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... dataserv. :(

    I changed TR4 and TR5 by BC877 and ... BC307 and now TR4 does not smoke anymore. :)
    Turrican Turrican April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... =Turrican;617659]
    I changed TR4 and TR5 by BC877 and ... BC307 and now TR4 does not smoke anymore. :)
    guesser guesser April 2012 Hardware
  • 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 …

    ... same device.

    For TR4 in particular, check that your ... transistors are suitable replacements for TR4. If you're unsure, use ...
    Zorn Zorn April 2012 Hardware
  • 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 ... original pins that?

    TR4 TR5 TR4 TR5

    E ...
    Jose_Leandro Jose_Leandro April 2012 Hardware
  • 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 …

    ... ' of the PCB, and there TR4 (650) is depicted with the ... above to the position of TR4 (keyboard connector at left side ... sketch whenever I replaced a TR4.
    Checking internet for datasheet ...
    roko roko April 2012 Hardware
  • 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 …

    ... ]

    Simplified workings: whenever TR4 gets conducting, a pulse via ... TR5 pull the brake. When TR4 stops conducting, the brake is ... is how TR5 helps TR4 oscillating. A hot TR4 could (could...) a ...
    roko roko April 2012 Hardware
  • Getting absolutely no video from a 128+I'm trying to get a friend's toastrack 128 to show video and I'm not having any luck. I'm in the US, so I don't have access to any TVs that can take …

    ... the 12V.

    Mostly tr4 or tr5 is broken.
    bverstee bverstee April 2012 Hardware
  • Spectrum 48k Issue 4S?I just recieved a Spectrum 48K that had the bottom case from an issue 1 and the top half from a later issue, and the main board is 1983 Issue 4S. I a…

    A 4S issue is a standard issue 4 produced by Samsung (thus the S). Nothing more nothing less, these too break down as easily as the rest... its not rare either.
    gtsamour gtsamour May 2012 Hardware
  • TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…

    ... could be the case that TR4 died and protected something else ... . If you leave out tr4 the something else can blow ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…

    ... ]

    Search it for TR4 string. You will find tons ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…

    ... />
    As pointed out, if TR4 has failed, you should also ... the coil itself or across TR4's base and collector. It ... low resistance reading here is TR4 failing with a base-collector ... short. If you've removed TR4 or are sure it is ...
    Zorn Zorn May 2012 Hardware
  • Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…

    I have also come across a similar issue when the small felt pads on the TV modulator have disintegrated (especially on a 4s board in a rubber keyboard case) - presumably some keys cause a slight short?
    rwap rwap May 2012 Hardware
  • What if there was no memory or space limitation?What if there was no memory or space limitation? We've had topics about the limitations of the Speccy's hardware, topics where we discussed how good …

    ... RAM and storage. The iPhone 4S has 512MB of RAM, and ...
    JamesW JamesW May 2012 Sinclair Miscellaneous
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... high reading, I would suspect TR4 has failed. It's unlikely ... with the expansion connector. If TR4 has failed, you should also ...
    Zorn Zorn May 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... power convertor. You should replace Tr4 and Tr5 first. You'll ...
    roko roko May 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... /> I should now go to TR4 and TR5, should i replace ... both? or just TR4 first?
    thanks
    tiago tiago May 2012 Hardware
  • The rescue of a coil.The problem at hand was a known defect transformer from the switching convertor inside a Spectrum. Both windings are not interrupted and not intercon…

    Where can I get 0.3mm dynamo coil? I am in the situation of a blown TR4 and I think it might be the transformer since any replacement i put there blows within seconds. However, there is no connection between primary and secondary wiring in the coil.
    Johan1973 Johan1973 May 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    D11 was dead, TR4 is dead. I have replaced ... and used alternative BC639 for TR4. TR4 dies almost instantly. Beyond the ...
    Johan1973 Johan1973 May 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... may well help with your TR4 problem.

    [URL="http ...
    kphair kphair May 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... may well help with your TR4 problem.

    [URL="http ...
    Johan1973 Johan1973 June 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... much does it cost the TR4 and TR5?
    My skills ... ... i can try to replace TR4 and TR5.

    I ... ) what is the price of TR4 and TR5?
    2) what ...
    tiago tiago June 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... a reasonable explanation. Remember that TR4 is an NPN transistor and ...
    Zorn Zorn June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... can. But the fact that TR4 blows very quickly if replaced ...
    Johan1973 Johan1973 June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... is clearly something wrong if TR4 fails.

    You may ...
    Zorn Zorn June 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... a ZTX651/652/653 for TR4 and a ZTX751/752/753 ... (in a small package) for TR4, but I'd think quite ...
    Zorn Zorn June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    D12 checks out, no sawtooth waveform on TR5 collector, there is one on the TR4 collector however.
    Johan1973 Johan1973 June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    TR4 getting blown might also indicate something is drawing too much current external to the power supply circuit (faulty 4116 RAM perhaps, or a short somewhere?)
    Winston Winston June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    [QUOTE=Winston;631473]TR4 getting blown might also indicate ... a few days. Then suddenly TR4 blew. I guess the strain ...
    Johan1973 Johan1973 June 2012 Hardware
<1…17181920212223…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
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    John Elliott on April 21
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    mel the bell on April 21
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Related Threads

  • Spectrum issue 4S ??? What is that?I recieved a spectrum 48k today that i bought from Ebay (rubber).<br /> I opened it up and to my surprise it was an Issue 4S, yes 4S!!!<br /> I didn'…
  • Spectrum Issue 4SI bought a speccy 48k off of eBay. Looking inside it has an Issue 4S board. But I cannot find evidence that the 4S was ever issued inside the rubber …
  • issue 4s for reapirHi All,<br /> This time I have issue 4s for repair :)<br /> Here is few screen shots and small movie after boot.<br /> [url]http://forest.no-ip.org/i…
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  • Issue 4S users... I need your help!Short story: Issue 4S spectrum don't work. TR4 seems to have pins at different places from other speccys (BCE versus EBC), and usual replacement part…
  • TR4 is goneMy TR4 transistor is burned.<br /> Can I replace this transistor with a TIP31B or C ?<br /> My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :)…
  • Help changing TR4 and TR5Hi all!<br /> Please, help me! :)<br /> I think I'm not understanding the correct pins of TR4/TR5 and the transistors.<br /> So, if anyone know the c…
  • Spectrum 48k Issue 4S?I just recieved a Spectrum 48K that had the bottom case from an issue 1 and the top half from a later issue, and the main board is 1983 Issue 4S. I a…
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