07-07-2011, 03:07 PM
(07-07-2011, 12:09 PM)Tedzed1 Wrote: PROBLEMS! all the wax caps have been replaced, fuses replaced with correct replacements, and refitted to the radiogram, turned on, and all the heaters started to glow as they should, pressed the record button and the magic eye sprang to life, so tried the functions, fast forward ok, rewind ok, pressed play, and one of the relays at the back started to quickly open and close, pressed stop and then play again, and this time the tape played, moved the speed adjuster, and it did what it should, so all tape control functions were working as they should, but it had no sound output, the same could be said as to recording, as when in record mode, the magic eye turns green but does not move, even when you adjust the record level, but pops could be heard when you change the Gram/Radio/micro selector switch. so this far I decided to pop to the kitchen to put the kettle on, on returning with my cup of coffee, I was greeted with the sound of what I could only describe as frying bacon, so quickly switched off and removed the deck to have a look,
On inspection, one of the plastic caps had decided to part company with it's innards, bubbling a black sticky mess from its terminal end, I take that it is an electrolytic capacitor, as it has a red and black wire , it is quite large, but is only rated at 0.2uf, but have never come across this sort of cap before, it reads on can, 0.2uf + 100ohms, 220V ac, temp max 70c ZN 1212 F, and it is made by FRACO. is this an electrolytic that also comprises a bleed resistor?
So gentlemen, a couple of questions if I may,
Am I right in understanding that if these caps are not fully operating the relays, could that be part of the problem as to why there is no record level/sound output?
Also, what could I replace the caps with, I have some 1uf 450v electrolytics in stock, could I use a couple of them in series and a 100ohm resistor to replace them with.
I am trying my best, I am working blind, because I cannot find the service data for this deck, any suggestions gratefully accepted.
Have enclosed some pictures.
It looks like a mains suppressor Paul.
These were commonly used in vacuum cleaners to reduce interference from the motor.
You may well pick one up from a local vac. service shop.
It will probably not effect the operation if it is removed but make a note of the connections, for when you fit the replacement.
Roger.
