Recent content by deltatango

I am trying to patch up (if possible) a wrecked Sefram 7835 meter, looking for a service manual or circuit diagram of its battery - power section can anyone help please..:) Thank you from David

Yes I was thinking about that motors drive IC more so because I found it hard to locate one, even UT Source did not know of it and was not showing up at my usual spares places I visit, then I would tend to work on reverse logic in that it may be a bad one that fails so wiping out stockpiles of...

Thank you so far for your inputs, mechanism, head, capstan belt, pressure roller have very little signs of wear/usage which is why I took it on as a project. Light is not an issue as it was well shaded when I tried it, loaded out OK but no drum spin up. I will continue with capacitor changes...

As an older retired service engineer who suffers from sight and shakes to some degree I take on "dumb" projects to keep me going until I get faulty items to fix for real. I took on an old Chinon VC1700 camcorder of the VHS-C brigade thought it would be fun plus soldering practice, smd caps had...

Got a Philips 32PF5521D/10 TV with lack of picture at switch on sound OK, this occurs at random I have its main service manual for LC4.3E AB and the similar AA version but they fail to show its power supply. This is a PLCD 190 P1 board number 3122 133 32806 can anyone help to supply a circuit...

I have uploaded a picture of my power supply to help with identification, I still worry that your caps popped which is a sign of heat or distress, these supplies can generate spikes when their capacitors fail. I would first check the 18volt zener with an ohm meter and see if it is short circuit...

With the exploded and problem capacitors I am concerned that either a short circuit may exist on the secondary side (low voltage side) or as may be possible a blown primary side (mains area) which tend to destroy several parts or some power supplies, but I have seen seem also go quietly (just...

Brutal but true! I admit I have snipped wires myself, notably a range of TV's that came blessed with tweeters which caused "problems" to its owners not used to the extra strident high frequency range before. Despite mods to alter the feedback slope of the amp etc (official and otherwise) I did...

I got one of those inexpensive freeview boxes to give my old analogue video some work to do before it packs up for ever, it had been working with an old Grundig unit but now that has become slow and power hungry compared to modern small units. I was pleased with the low power and size of this...

Ok in my case the zener diode had shorted out which then burned out R108. The zener (glass bulb item near to R108) thats fitted has a 1Nxxxx type code and I think (memory fades) was a 30 or 33volt at 1.3W range, I mention this because that capacitor that popped must have got very hot. This...

I have collected the various components to make an elevator system for my old dish using a 10mm stainless steel stud, BMW window motor and Mosfets to make a motor's "H" circuit. Just need a safe little switching circuit with a centre off position to ensure only one control line is + at any one...

Hi I fixed mine (re R108 post) I would think it is its power supply as that is mostly the thing that fails in most equipment. The Dualis to me was not a great looking design, as for schematics or any help from Metronics for technical information you will not be lucky I have tried and failed...

Sadly Metronic are sticking to their guns and will not say what its value is, I will give one last try but I doubt they will answer. That said I think my chosen value will not harm it in any way, manufacturers I have seen though can be more cruel to their products, leaving components to...

Well for now I have settled on 470ohm as a suitable value (one day I will find out its true value). This was chosen by using a variable resistor of under 1K and checking the current through the zener, up to 7mA caused its power supply no problem in holding the feed voltage to it. While 13mA...

Trying to fix a Dualis box which has a burnt out R108 resistor on its power supply which feeds a zener diode. Seems to be known about, have tried to email (France) Metronic but they remain silent on this issue, so can anyone help me please. Have fixed the rest of the supply though, suprised to...