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  • Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …

    ... readings, is, what is the test voltage of the multimeter when ... switched to resistance? Is the test voltage high enough to start ... the dirt and dust, the PCB can be cleaned with IPA ... leaked out and contaminated the PCB.

    If the voltages ...
    1024MAK 1024MAK March 2018 Hardware
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... the keyboard contacts on the PCB and they are for use ... "back to back" conventional Spectrum PCB membrane sockets . I partially tested ... have a spare Spectrum PCB to properly test them . They have not ...
    harriusherbartio harriusherbartio May 2018 Hardware
  • Spectrum 128k +2 Grey internal EAR modHi guys, I have done the EAR mod to my Spectrum +2 Grey as per this tutorial and want to load programs using the TZXDuino. http://retrocable.com/?p…

    You could try removing the plug coming from internal tape player on spectrum PCB and temporarily connect the wires of new audio jack to pins 4 (ear) and 1/5 (ground) to test if ULA picks up external audio signal.
    Renegade Renegade May 2018 Hardware
  • Spectrum 128k +2 Grey internal EAR modHi guys, I have done the EAR mod to my Spectrum +2 Grey as per this tutorial and want to load programs using the TZXDuino. http://retrocable.com/?p…

    ... the prompt).
    If the test with the cassette player is ... OUT pad on the cassette PCB or the IN pad if ...
    repetto74 repetto74 May 2018 Hardware
  • Spectrum 128k +2 Grey internal EAR modHi guys, I have done the EAR mod to my Spectrum +2 Grey as per this tutorial and want to load programs using the TZXDuino. http://retrocable.com/?p…

    ... cassette deck pcb are not good. I need to test now connections ...
    repetto74 repetto74 May 2018 Hardware
  • Spectrum 128k +2 Grey internal EAR modHi guys, I have done the EAR mod to my Spectrum +2 Grey as per this tutorial and want to load programs using the TZXDuino. http://retrocable.com/?p…

    ... cassette deck pcb are not good. I need to test now connections ...
    repetto74 repetto74 May 2018 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... . Things are tricker if the PCB is a multilayered board with ... not have a continuity range), test between each of the pads ... of the board. If the test is okay (meter bleeps or ... the wires through the relevant PCB holes followed by inserting the ...
    1024MAK 1024MAK May 2018 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... in . Yes, the Issue D PCB type appear to be the ... 't have a Spectrum to test it on and I very ...
    harriusherbartio harriusherbartio May 2018 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... /wiki/Continuity_test"]continuity test[/url] all the relevant PCB tracks before soldering ...
    1024MAK 1024MAK May 2018 Hardware
  • Re-created Multiface 128Just bought the bare board from the Bay and am wondering if anybody else on here has built one? Well made PCB, doc files online including a BOM an…

    ... continuity or resistance range to test (with the power off and ... you don't overheat the PCB pads for too long, or ... remove the capacitors, otherwise the PCB tracks may be damaged.
    1024MAK 1024MAK June 2018 Hardware
  • ZXBaremulator v3.1 releasedHi, A new version of my ZX Spectrum bare-metal emulator has been released with new features. You can download from [url=http://zxmini.speccy.or…

    ... a flashing screen .The next test will be to see if ... 3 (in other words to test to see if the new ... between the bottom of the PCB and the metal case (but ...
    harriusherbartio harriusherbartio March 2019 Emulators
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... to the “+” pad on the PCB, and rerun the above program ... , it would be great to test all the ROMs, too. Some ...
    Ast_A_Moore Ast_A_Moore May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... to the “+” pad on the PCB, and rerun the above program ... , it would be great to test all the ROMs, too. Some ...
    colourclash colourclash May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... pins from the circuit to test them?
    [/quote]
    Pretty ... stubs on the PCB later.

    Next, test each pin while ...
    Ast_A_Moore Ast_A_Moore May 2019 Hardware
  • How can I fix a problematic Retroleum Smart Card. I did not do anything "WRONG " with it but I did but it on a flexible cable and this seems to have "upset" it .Since then It does not perform the …

    ... mean that the original Spectrum PCB keyboard connector will not be ... Spectrum PCB and generally get it ready . Then I need to test ... ) The positioning of the Spectrum PCB could be aligned to suit ...
    harriusherbartio harriusherbartio June 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... stray capacitance of the PCB track as it snakes ... copper tracks on the PCB although low resistance, still ... other chips on the same PCB.

    And ... cross talk between adjacent PCB tracks, as one induces ... track at every point I test.

    The ...
    colourclash colourclash July 2019 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... on the voltage range to test the various supply voltages. If ... supply circuitry on the Spectrums PCB.

    Then, the way ... , both were breaks in the PCB tracks. Once the broken tracks ...
    1024MAK 1024MAK August 2019 Hardware
  • Spectrum USB KeyboardI know you can buy these but how do you make one . What I am thinking of be similar to the type described in Issue 1352 of Micro Mart at page 45 .The…

    ... pins on this USB kit PCB . With it all connected up ... like Arnhem . But a full test was needed as I found ...
    harriusherbartio harriusherbartio August 2019 Hardware
  • Recreated Spectrum .What do we get for the "now" (Aug 2017) best retail price of around £35?Well best/ cheapest retail prices can vary a bit so I thought it best to be specific. At this £35 price ,is it a good deal and what do we get ? A…

    ... thepower plug of the additional PCB in the Fuze Workstation and ... off the Display on the Test Rig Monior . This must mean ... the composite monitor on my Test Rig cannot be made to ...
    harriusherbartio harriusherbartio August 2019 Hardware
  • MB03 UltimateDear ZX friends, you may have heard of MB-02+, probably the best disk interface for ZX Spectrum, originated back in the 90's. Although not much sp…

    ... .

    Now specifications:
    • PCB dimensions: 10 x 10 cm ... also run diagnostic tool and test your Spectrum, memory ULA timing ...
    Hood Hood September 2019 Hardware
  • 48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…

    ... the whole set of the pcb is the same age.
    test them individually to show how ...
    Renegade Renegade October 2019 Hardware
  • How many New Style "Speccy" PCBs are Made to Fit in an "old style" 48K Case? And what are their names? Most of them are produced in small batches so there could be quite a few small variations. Many of these are not produced…

    ... out the connectors on the PCB so this limits the ... this ( I still need to test these though)
    ------------------------------------------------------------------------------------------------------------------------------------------------
    < ...
    harriusherbartio harriusherbartio October 2019 Hardware
  • Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …

    ... PCB on this one so I got down to trying to test ...
    harriusherbartio harriusherbartio February 2020 Hardware
  • Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …

    ... " a good keyboard so the PCB was no longer "perfect" I ... where it had been and test the Tynemouth v2.2 USB ... the blocks (length of Speccy PCB)

    3)5.6 ... between blocks (width of Speccy PCB)

    Or put blocks ... are in relation to Speccy PCB
    harriusherbartio harriusherbartio February 2020 Hardware
  • Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …

    ... a Towards Reasonable Way To TEST Them .

    The problem ... the connector on the Speccy PCB . To avoid damaging further PCBs ... and then be reused to test all the other DK keyboards ...
    harriusherbartio harriusherbartio February 2020 Hardware
  • Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …

    ... Towards a Reasonable Way to Test Them Part 2 (in ... old style 128k ( Amstrad ) PCB's KEYBOARD connectors are already ... of luck with that (no PCB to use for testing) . ... The next one has no PCB in it . I have ... my quest for a PCB to use with pre-existing ...
    harriusherbartio harriusherbartio February 2020 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... not damaged any of the PCB tracks, pads or plated through ... use your SMART card to test it further.

    Now ...
    1024MAK 1024MAK February 2020 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... leaving the stumps on the pcb which were hard to get ... Error?" " IC25/IC 26 Multiplexor Test : Votes for bad IC 25 ...
    harriusherbartio harriusherbartio February 2020 Hardware
  • Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …

    ... DK widens out (damages) the PCB keyboard connectors . So what is ... . The equipment used for the test was:-

    1) One ... the Smart Card v2 keyboard test facility . They worked so the ... was an easy way to test my membrane keyboard extenders!
    harriusherbartio harriusherbartio February 2020 Hardware
  • Spectrum USB KeyboardI know you can buy these but how do you make one . What I am thinking of be similar to the type described in Issue 1352 of Micro Mart at page 45 .The…

    ... I will first have to test the DK keyboard to make ... largely unmodified Issue 6 Speccy PCB ( this is currently in a ... .The display on the Plus PCB is not good . In fact ...
    harriusherbartio harriusherbartio March 2020 Hardware
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