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CapacitorsSorry, another question... I've done a bit of looking around, although after a couple of beers this may not have been as systematic as usual, but I …
... somebody. The designs where replacement values of capacitors are critical ... discharge cycle of a typical capacitor. The charge cycle will ... (ESR) of the specific capacitor and the discharge rate will ... a straight line as the capacitor will not discharge quickly ... -
Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…
... test and have put a variable load on the PSU. With ... multimeter. The value of the capacitor will also play a big ... -
Composite mod display problemI'm fairly ham-fisted with a soldering iron but I thought I'd have a crack at the composite mod on two of my 48K rubber keys, as I'd already opened o…
... a crack at the C25 capacitor replacement to begin with and have ... -
Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…
... the voltage rating of the capacitor is greater than the ... the voltage on a electrolyic capacitor goes much beyond it' ... always okay to fit a replacement capacitor that has a higher voltage ... Components/22uf-25v-Axial-Electrolytic-Capacitor-11-0125"]here[/URL] for ... -
Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…
... the negative side of a capacitor is indicated by a shorter ... legs was identical on the replacement C44?!?
Maybe I ... -
ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…
... resistors R29, R30, R78 and capacitor C27 form a self starting ... . This will then kill any replacement transistor in the TR9 position ... -
ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…
... able to provide me a replacement coil. I may also try ... , R30,[B] R33[/B] and capacitor C27 form a self starting ... -
Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
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Is this effectively the replacement for properly typed function pointers ... makes me slightly nervous is variable args functions. Do you still ... -
Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …
... ]
Is this effectively the replacement for properly typed function pointers ... makes me slightly nervous is variable args functions. Do you still ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... be safely powered.
Capacitor replacement is a fairly safe operation ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... changed any. For my next replacement I bought some of these ... 25v 105?C Radial Electrolytic Capacitor Rapid [URL="http://www. ... Components/4700uf-25v-Radial-Electrolytic-Capacitor-11-3748"]11-3748[/ ... 16v 105?C Radial Electrolytic Capacitor Rapid [URL="http://www. ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... ensure to get the right replacement?
With Rapid the ... -bc-components/2222-138-36229/capacitor-22uf-25v-axial/dp/2113009 ... -bc-components/2222-138-36229/capacitor-22uf-25v-axial/dp/2113009 ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... push bc ; stack new variable name
call next_one ... /> pop bc ; unstack new variable name
jr me_old_vp ... br /> inc a ; replacement or reset for insertion< ... br /> call next_one ; or variable
call reclaim_2 ; ... -
Faulty grey +2, or not?While I?m still fighting with two to three grey +2 computers, which doesn?t give a video signal, I received another grey +2, which acts very strangel…
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Use a good brand capacitor - it's worth spending a ... the cheapies, a shorted out capacitor can cause chips to blow ... costing you many euros in replacement chips.
Capacitors and ... an idea to have a capacitor thread on this forum, seems ... -
Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
... 't do it, it's capacitor replacement time! Always transistors first, though ... -
Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
C46 is indeed a 1uF capacitor.
You'll also ... help anyone unsure of the replacement process. -
Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
... ]C46 is indeed a 1uF capacitor.
You'll also ... help anyone unsure of the replacement process.[/QUOTE]
Replaced ... -
Spectrum+ Issue 3b customization and repairHi everybody, I've got a Spectrum+ that shows exausted electrolytics capacitors issues such as poor colors on the screen and speaker noises. I was go…
... be safe to proceed with capacitor replacement.
Your screenshot shows ... involved in this fix during capacitor replacement, that they are replaced in ... -
Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... like a headphone jack.) The replacement Power Supply is an official ... NEC D780C (It has the capacitor modification and I cannot see ... -
TR4 or TR5?My issue two gives horizontal bars on bootup. Flicking reset takes it to copyright screen though. I measured voltages and got 4,9V, 11,99V and -4,3V.…
I'll second Mark's suggestion - I've seen boards producing out of tolerance -5V, capacitor replacement will sort this out.
In my experience TR4/TR5 are either 100% alive or 100% dead :)
B -
New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…
Thanks :)
Yeah I think a capacitor replacement is probably inevitable. The chap I bought it off of said it had been in the loft unused for 20 years so they are probably in a bad state. -
ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…
... . One way to deal with variable or inconsistent unwanted DC levels ... , is to use a coupling capacitor. But of course, the coupling ... capacitor introduces additional problems: a change ... -
divMMC ENJOY wont work with 48+it works with my 48+ ver 6b with my 128+,my 128+2 128+2a 128+2b but not the ver 4 48+:confused:,the green light stays on the blue light never comes o…
... pointed by the NMIADD system variable. But the code in ROM ... , only when the NMIADD system variable is zero. That means calling ... execute the NMI code, a replacement routine activated instead of executing ... -
ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …
... /> Edit: nice job on the capacitor replacement above, very neat work :)
ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …
... /> Edit: nice job on the capacitor replacement above, very neat work :)
capacitor, while not touching the can ... , but the seating of the capacitor on the board is way ...I have returned! This time with no tape problems!Hello all. Some of you may remember me from about a month or so ago with this little spawn of satan... :lol: [IMG]http://www.ridgedpixel.co.uk/proj…
... same time.
Alternatively, capacitor replacement kits are available on [URL ... ://www.ebay.co.uk/itm/Replacement-axial-capacitors-for-ZX-Spectrum ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... is to remove C47. A replacement capacitor is soldered elsewhere on the ...48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... ; TR5. Also the standard Electrolytic capacitor replacement.
Now powers on but ... the tracks from a replaced capacitor had lifted and was shorting ...Double keystrokes on zx spectrumHappy New Year everyone. I have this spectrum 48k issue 3b I?ve been working on now and then. I have replaced upper rams, installed a lower ram repla…
... 's affecting the REPDEL system variable at address 23561... entering POKE ... 's had a lower memory replacement already, but I can't ...where to find Harlequin rev. F all mods till now ?Hi all :) because no more broken speccys around for now, is time to build first of my Harlequin's rev F, I looking in forums and look at Ingo posts…
... board
* solder a capacitor of 10 pF from the ... wires.
Now connect a variable power supply and begin to ...
