World of Spectrum
  • Categories
  • Discussions
  • FAQ
  • Sign In
Home › Search
Title Search
@title beer Word 'beer' in title
User Search
  • @user admin Only posts by Admin
Text Search
  • @body beer Word 'beer' in the text
Phrase Search
"Hello World" Exact phrase match
Exclude Terms
  • car -red Search cars that are not red
"Or" Searches
  • honda | bmw 'honda' or 'bmw' results
Multi-Field
@(title,body) hello Both contain 'hello'
WildCard
  • hond* civ* Match all with an astrix
Combination
  • @title bmw @user admin
See more supported syntax examples
Search Again :: Adv Search 1000 results in 0.002s
<1…14151617181920…34>
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... somewhere near the TR5 and TR4 transistors.

    MP3 here ...
    absinthe_boy absinthe_boy October 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    I've removed TR4 again and checked it, got hFE reading of 160 which seems to be OK. So it's not TR4...despite my rather inelegant soldering.
    absinthe_boy absinthe_boy October 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... other thing if I change TR4 and TR5. Instead ZTX650 I ... finger in the TIP31. If TR4 get hot then stop the ...
    Jose_Leandro Jose_Leandro November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... other thing if I change TR4 and TR5. Instead ZTX650 I ... finger in the TIP31. If TR4 get hot then stop the ...
    Jose_Leandro Jose_Leandro November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... without a tr5 (ztx213) the tr4 doesnt heat up.
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... without a tr5 (ztx213) the tr4 doesnt heat up.

    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... the tr5 in place the tr4 doesnt burn up.
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... 'll post back if the tr4 keeps behaving the same way ...
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    Well since its the ztx650 that is going out, it should be the 12V line right? Though the fact that when i have the tr5 out the tr4 doesnt blow makes me think (according to the schematic) that it may have something to do with the +5 line.... or not?
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    TR4 and TR5 work together, without TR5 present TR4 will not get turned on (if I've got my head around the circuit right)
    guesser guesser November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... shorted out then I think TR4 would be constantly "on" which ...
    guesser guesser November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... ) try with fresh Tr5 and TR4 (they act together).
    roko roko November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... trials. I know that when tr4 fails its better to renew ... 's suggestions tonight, if the tr4 still doesnt work right with ...
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... in other directions. The Tr4 and Tr5 transistors work in ... power is switched on, Tr4 will conduct completely and then ... Tr5 controls the current through Tr4, as a kind of stabilisation ... /> Because the 'dead' current through Tr4 (without the oscillating) is much ...
    roko roko November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... .

    Well apparently the tr4 isn't the only thing ...
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... />
    [QUOTE]Well apparently the tr4 isn't the only thing ...
    roko roko November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... />
    No different results. The tr4 still heats up....

    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... /> There is current flowing through Tr4, thats why it gets hot ... current in the base of Tr4. Through R60/R61, these necessarely ... self-generated pulses that block Tr4, and more specificly the very ... rise of the current through Tr4 during powerup,
    a leaky ...
    roko roko November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... There is current flowing through Tr4, thats why it gets hot ... self-generated pulses that block Tr4, and more specificly the ... />
    Symptom: Short persists with tr4 removed
    Action: Check tr5 ... C44.

    Symptom: TR4 blows again
    Action:
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... (something like causing synchronicity between tr4 and tr5)... I measured them ...
    gtsamour gtsamour November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... (something like causing synchronicity between tr4 and tr5)... I measured them ...
    roko roko November 2011 Hardware
  • Toastrack troubleI just received a toastrack off ebay that someone had bizarrely removed the modulator, no matter, ill go through RGB and replace that at some point, …

    ... right of the small coil, tr4 if i remember correctly). You ...
    gtsamour gtsamour December 2011 Hardware
  • 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…

    ... about my readings
    - replace TR4 an TR5 by equivalents
    TR4 and thus a faulty lower ...
    maskenlos maskenlos December 2011 Hardware
  • 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.
    gtsamour gtsamour December 2011 Hardware
  • 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…

    ... possibilities:

    [LIST]
    [*]TR4 or TR5 [I]almost[/I ... just go ahead & replace TR4, TR5 and electrolytic caps.
    RetroTechie RetroTechie December 2011 Hardware
  • 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…

    First thing to do: change TR4/5. [i]Anything[/i] to ...
    Spirantho Spirantho December 2011 Hardware
  • 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…

    ... into basis of Tr4, creating a negative feedback. Tr4 sends this current ... the current going into basis Tr4. Also the Vb of Tr5 ...
    roko roko December 2011 Hardware
  • 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…

    Just thinking: when so much power is leaking away that the voltage swing is too low (say a defect winding), then the oscillator will work to the max to restore the correct output. This then must result in a very hot Tr4.
    roko roko December 2011 Hardware
  • 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…

    ... on Friday to you. But TR4 is not getting hot or ...
    maskenlos maskenlos December 2011 Hardware
  • 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…

    For Tr4: BC877, BC538 |
    For Tr5: ...
    roko roko December 2011 Hardware
<1…14151617181920…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

HitBox

Word Docs Hits
tr4 886 1.3K
4s 420 554

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…
  • Spectrum +2's and TR4...?Hi people,<br /> <br /> I saw mentioned in another thread (+2 composite mods) that TR4 is the wrong way round on grey +2's. Can someone give me more …
  • 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…
  • 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…
  • Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day.<br /> <br /> Changed ULA - did not help.<br /> <br /> Tested TR6 as i could and compared …

Related Searches

  • toastrack 12v tr4
  • tr4 calibration
  • issue 2 color tr4 calibration
  • 4s schematica
  • 4s schematics
  • 4s composite
  • issue 4s dark picture
  • tr4
  • 6u tr4
  • toastrack tr4
  • 4s video adjust
  • 4s video
  • issue 4s jailbar
  • 4s
  • issue 2 tr4 voltage
  • issue 2 tr4
  • tr4 voltage
  • dc converter tr4 tr5 coil
  • converter tr4 tr5 coil
  • ram 4116 tr4 tr5

Copyright © 2024 World of Spectrum