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Search Again :: Adv Search 1000 results in 0.028s
<1234567…34>
  • Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…

    ... RAM, are the voltages:
    4116 pin 8: [b]10,7V[/b ... be 12V, very low)
    4116 pin 1: -4,68V (within tolerances of ... -5V)
    4116 pin 9: 4,99V (ok)
    georgedb georgedb September 2016 Hardware
  • 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…

    ... warm, not hot, 4116 all are cold. ... DRAM to replace. I'll start with TR4.
    Why all 4116 ...
    ... ---o---
    1 -|........|-16 gnd
    2 -|........|-15 ...
    voltage of pin 1 to pin 16 is -5v
    pin 8 to pin 16 is +12v
    voltage of pin 9 to pin ...
    treneiro treneiro May 2010 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    4116 DRAM pin-out:
    [IMG]https://farm4 ... .png[/IMG]

    Pin 1, VBB, -5V (Should be between ... 5V and -5.5V)
    Pin 8, VDD, +12V (Should ... 5V and +12.5V
    Pin 9, VCC, +5V (should ... />
    All measured to pin 16, VSS, 0V. All voltages ...
    1024MAK 1024MAK July 2014 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... /> You need eight 4116 DRAM chips and eight 4164 DRAM chips.

    4116 DRAM chips, switch your meter to ... resistance range and measure pin 1 (black probe) and pin 16 (red probe ... test, but you need the 4116 DRAM working first, so we ...
    1024MAK 1024MAK July 2014 Hardware
  • not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …

    ... 14). So test pin 1 to all the other pin 1's etc. Test ... between pin 2 and 14 ... to ONE of the 4116 DRAM chips (pin 2 and pin 14).

    pin on each 4116 DRAM chip to every other pin on the ...
    1024MAK 1024MAK July 2015 Hardware
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... on the pins of the 4116 DRAM chips. Loss of the -5V ... . Search the Internet for the pin-out ;-)

    If the ... 4116 DRAM chips are faulty. In the Spectrum, all the DRAM chips are 1 ... bit wide, so often a fault DRAM chip ...
    1024MAK 1024MAK January 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... and write to the 4116 "lower" RAM. So ... circuits/RAS (pin 35), /CAS (pin 1) and /DRAMWE (pin 4). Next ... data pins D0 (pin 18) to D7 (pin ... for that circuit for that pin.

    Note ... that go to the 4116 DRAM chips may have ...
    1024MAK 1024MAK August 2017 Hardware
  • My experience with a ZX Spectrum clone called Elwro 800 JuniorAfter a long break in using this forum (modellrailroading is my main hobby) I'm back and want to tell something about an interesting ZX Spectrum clon…

    ... /> Computers had:
    - 64 KB DRAM
    - 24 KB ROM
    pin
    - 1 x ZX Spectrum network ... monitor port DIN 5-pin
    - 1 x industry standard RGB monitor ... one side and Centronics 50-pin on the other side. This ...
    brian-82 brian-82 August 2015 Hardware
  • 48K Issue 3B ROM to EPROM methodsHi folks, While fixing up a completely dead Commodore PET I needed a way of testing the 4116 RAM chips that make up its 32K, some googling found a…

    ... way of testing the 4116 RAM chips that make ... pictures), switch added to pin 27 to do the address ... socket pin 28 to pin 1 for Vcc and.... crash. Pin 27 ... everything back to stock (pin 1 of original ROM bent out ... and /ROM_CS pulsing but pin 20 always high, DMM ...
    witchy witchy December 2015 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... the appropriate pins of the 4116 RAM (awful devices that require ... !)

    The pin out of the 4116 is here:
    [url ... /> ...but in summary:
    Pin 1 = Vbb: -5v
    Pin 8 = Vdd: +12v ... turned out to be bad 4116 RAM, which seems to be ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... the appropriate pins of the 4116 RAM (awful devices that require ... !)

    The pin out of the 4116 is here:
    [url ... /> ...but in summary:
    Pin 1 = Vbb: -5v
    Pin 8 = Vdd: +12v ... turned out to be bad 4116 RAM, which seems to be ...
    Winston Winston March 2007 Hardware
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... (Vss). Then check:

    pin 1 - Vbb: this should be -5v ... (note the minus sign!)
    pin 8 - Vdd: this should be ... +12v
    pin 9 - Vcc: this should be ...

    Datasheet for the 4116 is here, so you can ...
    Winston Winston March 2007 Hardware
  • Spectrum 48K ROMHi Can anybody help I have an Issue 6a Circuit Board which has a faulty ROM Chip. Is it possible to program a ROM Chip with the 48K ROM and fit it as…

    ... as an inverter) going to pin 1 (select) of the two address ... going to the select pin, so the 4116 RAM sees the rising ... has risen high and the 4116 has latched the row address ...
    Winston Winston April 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... common probe on pin 16 of one of the 4116 RAM chips ... .
    Then test the following pins:
    Pin 1 ... : Should show -5v
    Pin 8: Should show ...
    Winston Winston May 2007 Hardware
  • Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…

    ... voltages being supplied to the 4116 RAM. Refer to the diagram ... your voltmeter on pin 16 of one of the 4116 RAM chips ... , and check the following pins:

    Pin 1 ... : Should show -5v (MINUS 5 volts)
    Pin 8: Should ...
    Winston Winston July 2007 Hardware
  • not much gear and absolutley no ideaIm looking for some help with two spectrums that i have just dug out of storage and are both unfortunatley faulty. I had always regreted that during …

    ... 8 chips which should have 4116 somewhere on them - ... the following:

    Pin 1 - Vbb - minus 5 volts
    pin 16.

    ... datasheet, which shows you the pin out:
    [url] ... is good, but the 4116 memory is probably bad. ...
    Winston Winston June 2009 Hardware
  • dead issue 6a boardI've just been back to the uk and found my old 48K + there - and bought it back with me to singapore - it's giving white border and red bars. From wh…

    ... /> I cut off all the 4116's, took out the pins ... connected both to 5v bent pin 1 up on each chip and ... was presented with (1) no bangs pops or other ...
    nuggetreggae nuggetreggae September 2009 Hardware
  • 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…

    ... 4116 (lower 16K of RAM) have all correct voltage supplies present. Pin 1 ... should be -5V, Pin 8 should be +12V, Pin 9 should ...
    RST#08 RST#08 March 2010 Hardware
  • Help with broken SpectrumHi There, Just received a ZX Spectrum computer. It's an issue 3B (48k version). When I power it up (9V centre pin -V) nothing happens. It's complete…

    ... corner of board). Check a 4116 datasheet or 48K schematic for ... be:

    Pin 16 (upper right corner pin) = GND = same electrical ... right) = +5V
    Pin 1 (upper left) = -5V
    Pin 8 (lower left ...
    RetroTechie RetroTechie September 2010 Hardware
  • ZX Spectrum+ Problem - Need help -Greetings guys, I bought one ZX Spectrum+. This is what displays on the TV: [IMG]http://d.imagehost.org/0371/17102010_001.jpg[/IMG] When I switch …

    ... are working. -5V is OK, DRAM 4116 are readable.

    If ... can also check reset signal pin 26 of CPU (should be ... is no short to other pin or +5v or ground.
    willcz willcz October 2010 Hardware
  • 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…

    ... 4116 chips? I checked them, I'm getting about -5V on pin 1 ... a 5V output. On the 4116 chips, the things aren't ... around -0.3V on pin 1, about +2V on pin 8, and the ...
    Diogo Diogo February 2011 Hardware
  • 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…

    ... 4116 chips? I checked them, I'm getting about -5V on pin 1 ... a 5V output. On the 4116 chips, the things aren't ... around -0.3V on pin 1, about +2V on pin 8, and the ...
    RetroTechie RetroTechie February 2011 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... correct on my machine, but pin 1 is only showing -.25v??[/QUOTE ... -.25V is coming from(!) the 4116 chips.

    [QUOTE]The ...
    roko roko December 2011 Hardware
  • 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…

    ... ;

    IC6 pin 1 = -4.9V
    IC6 pin 8 = 11.9V ...
    IC6 pin 9 = 4 ... is it possible for the 4116 chips to fail if all ...
    kamilb1998 kamilb1998 February 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…

    ... resistance between 0V (4116 pin 16) and:

    -5V (pin 1 ) - should read ... a few hundred k ohms.
    12V (pin 8 ... ) - should read 1.5 - 3 k ... ohms.
    5V (pin 9 ) - should ...
    Zorn Zorn April 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…

    ... /> Check that 5V(9), -5V(1) and 12V(8 ) are all ... lower left). I put the 4116 pin numbers in brackets after the ...
    Zorn Zorn May 2012 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... stuff! :)

    Pin 1 : -5.0V
    Pin 8 : 12.3V (static ... )
    Pin 9 : 5.04V ... a case of putting each 4116 back in one at a ...
    deadeye deadeye April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... stuff! :)

    Pin 1 : -5.0V
    Pin 8 : 12.3V (static ... )
    Pin 9 : 5.04V ... a case of putting each 4116 back in one at a ...
    Falco-F8L Falco-F8L April 2013 Hardware
  • Some problems with 2 ZX Specturm board'sHi, last week i got some ZX Spectrum stuff. Also 2 ZX Spectrum 48K's, one in the orginal case the anoter one in a DK'tronixs case. Both have problem'…

    ... the report about the 4116 chip:
    1 - 4.78v
    ... :-

    [LIST]
    [*]Pin 1 is VBB and should be ... to -4.5V)
    [*]Pin 8 is VDD and should ... to +13.2V)
    [*]Pin 9 is VCC and should ... or modulator case or pin 16 of the 4116)

    ...
    1024MAK 1024MAK November 2013 Hardware
  • Some problems with 2 ZX Specturm board'sHi, last week i got some ZX Spectrum stuff. Also 2 ZX Spectrum 48K's, one in the orginal case the anoter one in a DK'tronixs case. Both have problem'…

    ... approx. -5v on pin 1, +12v on pin 8 and +5v on ... pin 9).

    Usually ... suggested using strips of turned pin SIL sockets - easier to ... 4116 chip with a multimeter for shorts between ground (pin ... 16) and pins 1,8 and 9. ...
    balford balford November 2013 Hardware
<1234567…34>

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