Gefunden für cold cap spannungsregler - Zum Elektronik Forum |
| 1 - Elkos / Kondensator in Verbindung mit 78XX -- Elkos / Kondensator in Verbindung mit 78XX | |||
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| 2 - Interfunk/Grundig/Siemens VCR 2000 - White spots, snow / Accepts tape but won't play -- Interfunk/Grundig/Siemens VCR 2000 - White spots, snow / Accepts tape but won't play | |||
| Hello Perepandel,
the size of the capacitors may be really smaller than the original types. Today, the industry is able to manufacture these parts a lot smaller than 25 years ago. The blue caps are X or Y-types for noise supression in the power supply. I have such caps, they are really small, even with the same capacity! And also the electolyt caps are today very smaller than in the 80´s. The only things you have to look for: The capacity must be the same and the max. voltage must be at least the same as of the original caps. A higher voltage is no problem, only if the mechanical dimensions are to big, so that the caps don´t fit. And, of course, the cap type must be the same. When a Y-type is mounted, you must take a Y-type again. (The Y-types are not so important to rechange. The electrolyt caps are more important, especially of the ERO brand. They get dry after 25 years a lot.) With the sparks on your Interfunk: It is possible, that the dynamic track following system does not work properly. That will be very difficult to find the fault. First, you have to measure the voltage on the contacts on top of the head drum (one for each head). With a oscilloscope, the voltage has to be relative &... | |||
3 - SNT fehlerhafte Spannungen -- TV ITT Ideal Color 3126 Oscar | |||
| Hallo
Der Prozessor braucht die 5 Volt(gewonnen aus den 8 Volt) und die rote LED bekommt die 5 Volt (gewonnen aus den 16 Volt) Fazit das NT läüft nicht richtig an. Hier gleich die komplette Fehlerliste Monoprint B Comes on with a screech C901 4µ7 400v & C707 2µ2 63v Monoprint B Cuts out & int loses chan memory 5v reg IC1405 Monoprint B dead HT at LOP Tr low at 25v; C701 4µ7 400v low cap (HT smoother) Monoprint B Dead Dry joints pin Q of chopper tfmr Monoprint B Dead T501 BU508A LOP tr leaky, dry joint C518, C712 47µ 16v hi esr Monoprint B Dead D733, IC701, R715, R721, D702 Monoprint B Dead - 115v at BU508D collector. Try LOPTX see Tv mag. Monoprint B Dead - low HT & no EHT LOPTx - scope LOPTr coll - has lots of spikes ITT Monoprint B Dead - no 115v feed to line stage. C701 ( 4.7u f ) in PSU. Monoprint B Dead - pri psu ok D733 & C734 Monoprint B Dead - tripped LOPTx or s/c LOP stage Monoprint B How switch mode PSU works. With ccts. Monoprint B Int dead Dry joints chopper tfmr Monoprint B No cold start C722 470µ 16v (8v smoother)- NOTE wrong markings on pcb top Monoprint B No control via front controls Keypad defective - try cleani... | |||
| 4 - Videorecorder Grundig 2x8 stereo -- Videorecorder Grundig 2x8 stereo | |||
| Hello Nicola,
Aiman F. will be right, when he says, that the 33VD-Voltage must be present all time after power on. It´s the power for the display (and perhaps for some other parts). I didn´t read this carefully, sorry! I will take a look into my service manual and scan the parts "power supply" ("Netzteil") and "Ablaufsteuerung" for you and post them here as a PDF. If the technical instructions are also in english language (in the manual), then of course I will scan them for you. The fuse-resistor: No, that on your picture looks like a transistor. A fuse-resistor looks like a normal resistor. On the modules in the 2x8 they are most times red coloured and mounted with a distance from the printed board (0,5-1,0 cm). It is also important, that you replace electrolyt-cap´s with new ones having the same capacity! Either too low and also too high capacity can cause failures or damages! Please check the power board for "cold" soldering points, this can be a fault as well. Wait until the PDF´s are here. Perhaps i will manage that on the evening after work. Is your VCR model No. "2280" and not "2280a&q... |
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