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General Discussion Area / Re: car stereo question
« on: 04 January 2026, 18:17:31 »
thankyou
will print them off at work tommorow and have a play !
will print them off at work tommorow and have a play !
- 07 January 2026, 03:08:22
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Please play nicely. No one wants to listen/read a keyboard warriors rants....
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2
General Discussion Area / Re: car stereo question
« on: 04 January 2026, 14:10:51 »
yes i usually carry on until i find the problem .just didnt expect this to take a few years !. i couldnt have done it thou without mr lco112g whom ive probably srcewed up his head over this !
however ive learned a lot from him and im now going to have another go at thd original thread issue .(not turing on some of the time !)
i bought two units this month and added the pull up resistor to both of them as they didnt sound perfect in the cold bug now do .one of them however only turns on 9 times out of ten so im ready to bore you all on this issue now !!!!!!!
however ive learned a lot from him and im now going to have another go at thd original thread issue .(not turing on some of the time !)
i bought two units this month and added the pull up resistor to both of them as they didnt sound perfect in the cold bug now do .one of them however only turns on 9 times out of ten so im ready to bore you all on this issue now !!!!!!!
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Omega General Help / Re: SKF Cambelt kits ?
« on: 03 January 2026, 11:46:08 »
the "fits all models" is true to a point . on the later ones you can still fit an adjustable lower pulley if you want and obviously fit the new stuff to your original top assembly (never sure why you got a new assembly anyway ? were they prone to failure ?)
only thing im not sure of is i dont know if a later lower fixed pulley would work on an earlier car ?
you could also swap pulley centre bores if needs be !
i bought (like many on here) a few of the delco kits that were around a few years ago for £25 each.
only thing im not sure of is i dont know if a later lower fixed pulley would work on an earlier car ?
you could also swap pulley centre bores if needs be !
i bought (like many on here) a few of the delco kits that were around a few years ago for £25 each.
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General Discussion Area / Re: car stereo question
« on: 30 December 2025, 23:47:00 »
ITS SORTED !
even cutting the track right at the transistor base and removing that resistor didnt solve it .that transistor is so sensitive ! you only needed to get your finger near it and it started to conduct! so i added a 10k resistor across its base and emitter .that keeps it at 4.9v and stops it picking up any interference or reistance to earth . i just confirmed it by putting the unit outside for a few hours .its quite cold and frosty here at the moment .just brought it in and in no time it was wet with condensation BUT CASSETTE SOUND IS STILL OK !!!
so il be doinn this mod to the others .thankyou immensly for your help .i wouldnt have thought of doing this .its either a design fault ,component of who knows what !!
the other issue of not always turning on is not as important now as ive now got useable spare units !
even cutting the track right at the transistor base and removing that resistor didnt solve it .that transistor is so sensitive ! you only needed to get your finger near it and it started to conduct! so i added a 10k resistor across its base and emitter .that keeps it at 4.9v and stops it picking up any interference or reistance to earth . i just confirmed it by putting the unit outside for a few hours .its quite cold and frosty here at the moment .just brought it in and in no time it was wet with condensation BUT CASSETTE SOUND IS STILL OK !!!
so il be doinn this mod to the others .thankyou immensly for your help .i wouldnt have thought of doing this .its either a design fault ,component of who knows what !!
the other issue of not always turning on is not as important now as ive now got useable spare units !
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General Discussion Area / Re: car stereo question
« on: 29 December 2025, 15:27:59 »
beleive me this has been screwing my head up for ages too . i started with this a few years back as one of my stereos went distorted .i bought another off ebay and the problem SEEMED sorted but i was curious what was actually wrong with the original unit .didnt realy find the faulty component then so gave up temporarily .THEN the same issue started happening to my other "same " stereos so i thought its a obviously a component that goes faulty with age .makes sense because they used to work and wouldnt be designed to not work right in winter !!
so now (if the problem is found ) il find out over the next few weeks, then although i still dont know which component is actually failing this workaround may just solve the issue anyway and doesnt seem to affect its functioning .radio plays fine ,cd changer and cassette and the display shows what it should and the selector switch does what it should .il try the suggested pull up resistor as the next stage if any issues present themselves .
a great big thankyou to anyone who helped especially mr LCO112G whom i am extremely gratefull to .
so now (if the problem is found ) il find out over the next few weeks, then although i still dont know which component is actually failing this workaround may just solve the issue anyway and doesnt seem to affect its functioning .radio plays fine ,cd changer and cassette and the display shows what it should and the selector switch does what it should .il try the suggested pull up resistor as the next stage if any issues present themselves .
a great big thankyou to anyone who helped especially mr LCO112G whom i am extremely gratefull to .
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General Discussion Area / Re: car stereo question
« on: 29 December 2025, 13:44:03 »
i think were onto something here !
after the connector on the board for the mute switch (the green wire switched to gnd) there is an inline resistor and then its straight to that first transistor .i have removed the resistor effectively taking the mute switch trigger out of the equasion .this appears to have cleaned the signal up considerably . so maybee that transistor had some leakage and was partly switching . i beleive it might /shouldhave a resistor somewhere to keep it pulled off (or not?) but it seems like weve got it .no noticeable difference to how the rest of the unit works . was affected more in damp or cold weather so may have been partly switching that transistor on ? will try the one in the car on a damp cold day and then remove the resistor in situ and see how it sounds .
if this is the fix then you have solved me a problem that has been frustrating me for years and i spent a hell of a long time replacing stuff /swapping stuff i didnt need to ! learning curve or what !!
after the connector on the board for the mute switch (the green wire switched to gnd) there is an inline resistor and then its straight to that first transistor .i have removed the resistor effectively taking the mute switch trigger out of the equasion .this appears to have cleaned the signal up considerably . so maybee that transistor had some leakage and was partly switching . i beleive it might /shouldhave a resistor somewhere to keep it pulled off (or not?) but it seems like weve got it .no noticeable difference to how the rest of the unit works . was affected more in damp or cold weather so may have been partly switching that transistor on ? will try the one in the car on a damp cold day and then remove the resistor in situ and see how it sounds .
if this is the fix then you have solved me a problem that has been frustrating me for years and i spent a hell of a long time replacing stuff /swapping stuff i didnt need to ! learning curve or what !!
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General Discussion Area / Re: car stereo question
« on: 28 December 2025, 16:36:55 »
BUT it also isnt a problem with the microswitch as such because ive swapped complete plug and play decks between units so more a case of an issue with the muting circuit itself .funnily enough of all the smt components that i swapped none of those transistors (or nearby resistors/caps )were touched!
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General Discussion Area / Re: car stereo question
« on: 28 December 2025, 16:15:11 »
this also sort of ties in with the fact that even on a good unit if you get your finger close to that gren wire from the mute microswitch you can make it sound distorted but never saw the connection .!
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General Discussion Area / Re: car stereo question
« on: 28 December 2025, 15:41:36 »
hi and thankyou for all this .
i mistook the other transistors as another amp stage !
yes the 4558 is the preamp ic and it all goes eventually into the 7348 .on one unit i have fed the head into a seperate preamp board robbed from a philips 752 and wired it straight down to the 7348 coupling caps.all works well so thats one unit sorted and proves im in the right area .
as for the other units i will now check the muting switches for any resistance leakage (or could i eliminate them completely ?
and yeah that 1350 plug contains the 12v motor supply and also two microswitches .one looks like it tells the motor to turn on and the other looks like it tells the system wether you are in play or fast forward/rewind and not play so yes i agree i this is the mute command ?
will have a play with this wire .thankyou again .will report back
i mistook the other transistors as another amp stage !
yes the 4558 is the preamp ic and it all goes eventually into the 7348 .on one unit i have fed the head into a seperate preamp board robbed from a philips 752 and wired it straight down to the 7348 coupling caps.all works well so thats one unit sorted and proves im in the right area .
as for the other units i will now check the muting switches for any resistance leakage (or could i eliminate them completely ?
and yeah that 1350 plug contains the 12v motor supply and also two microswitches .one looks like it tells the motor to turn on and the other looks like it tells the system wether you are in play or fast forward/rewind and not play so yes i agree i this is the mute command ?
will have a play with this wire .thankyou again .will report back
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General Car Chat / Re: So what have you done to your car today?
« on: 28 December 2025, 15:18:51 »Mine went to the kosovans shortly after its puddle dunking in February. One wash a year is more than enough.youre a braver man than me .!
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General Discussion Area / Re: car stereo question
« on: 25 December 2025, 19:45:35 »
its certainly more fun than christmas telly !
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Omega General Help / Re: Central locking problem
« on: 25 December 2025, 19:43:28 »
the weather/cold doesnt help as any grease or oil on the locks ,mechanism and associated parts will be stiffer compared to warmer weather .its worth lubricating everything you can get at with ypur chosen lubricant (down the button recess,in and around the door catch etc and see if if gets any better .idealy remove the door card and get into it properly .giving yoh the chance to check the actual mechanism behind the catch for the failing centre spindle issue and any other rust/dry issues and possible even trying to sort the central locking issue .if the system is totally inoperative if doesnt point to an actuator fault as such thou as that usually makes the system erratic to lock and unlock randomly ??
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General Car Chat / Re: So what have you done to your car today?
« on: 25 December 2025, 12:43:34 »
mine needs a good wash and now the hosepipe ban is over i can do it soon but this morning been still playing with my cassette deck issue .think were getting somewhere now thou !
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General Discussion Area / Re: car stereo question
« on: 25 December 2025, 12:37:22 »
after further testing i have concluded that "some " rogue component in the second stage of the preamp (just a transistor in second stage)is causing the issue .even thou everything seems to test similar in values to a good unit .im going to try some freeze spray when i get some but in the meantime on one faulty unit i have fitted the standalone preamp board from a philips 752 this morning which has eliminated the problem completely .thus proving my theory that there something there which is either a design flaw or an age related one .either way this does solve it and make the xassette crystal clear again .needed slightly higher coupling caps (4.7 instead of 2.2uf)
other idea which im contemplating is modding to a usb stick input as well as or instead of the cassette .might try this on one unit to see how it sounds .
the realy annoying thing here (althou its a learning curve) is the amount of parts /ic's etc that ive swapped over now and years ago when i knew less about what i was doing ! and didnt need swapping at all !? hey ho !
other idea which im contemplating is modding to a usb stick input as well as or instead of the cassette .might try this on one unit to see how it sounds .
the realy annoying thing here (althou its a learning curve) is the amount of parts /ic's etc that ive swapped over now and years ago when i knew less about what i was doing ! and didnt need swapping at all !? hey ho !
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General Discussion Area / Re: car stereo question
« on: 23 December 2025, 09:04:00 »
thankyou for that .il try work out the mute circuit and disable it .see what happens